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Novak I, Košak R, Travnik L, Gorenšek M, Bošnjak K, Vengust R, Zupanc O. Polyetheretherketone (PEEK) cages for anterior column reconstruction in pyogenic vertebral osteomyelitis. J Orthop Surg (Hong Kong) 2020; 27:2309499019842490. [PMID: 30987501 DOI: 10.1177/2309499019842490] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The objective of study was to evaluate a case series of patients in whom polyetheretherketone (PEEK) cages were used for anterior column reconstruction in vertebral osteomyelitis. Fifteen patients underwent clinical and radiological evaluation with average follow-up of 26 months. Parameters assessed were time of surgery, blood loss, segmental kyphosis or lordosis angle, time to solid bony fusion, ambulatory status, and functional outcome. Mean time of surgery was 150 min with mean blood loss of 530 ml. One patient died in early postoperative period. All patients without preoperative neurologic deficit were walking unaided first day postoperatively. Solid bony fusion was demonstrated in 14 patients, on average 7.1 months postoperatively. Functional outcome at the latest follow-up was excellent, good, or fair in 86%. Two failures with recurrent infection were treated with PEEK cage removal and reinstrumentation. High success rate could be expected when PEEK cages are used for anterior column support in pyogenic vertebral osteomyelitis.
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Affiliation(s)
- Igor Novak
- 1 Department of Orthopaedic Surgery, Maribor University Medical Center Maribor, Slovenia
| | - Robert Košak
- 2 Department of Orthopaedic Surgery, University Medical Centre Ljubljana, Ljubljana, Slovenia
| | - Ludvik Travnik
- 2 Department of Orthopaedic Surgery, University Medical Centre Ljubljana, Ljubljana, Slovenia
| | - Matevž Gorenšek
- 2 Department of Orthopaedic Surgery, University Medical Centre Ljubljana, Ljubljana, Slovenia
| | - Klemen Bošnjak
- 2 Department of Orthopaedic Surgery, University Medical Centre Ljubljana, Ljubljana, Slovenia
| | - Rok Vengust
- 2 Department of Orthopaedic Surgery, University Medical Centre Ljubljana, Ljubljana, Slovenia
| | - Oskar Zupanc
- 2 Department of Orthopaedic Surgery, University Medical Centre Ljubljana, Ljubljana, Slovenia
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de Souza HP, Otero UB, da Silva VDSP. Profile of healthcare workers involved in accidents with exposure to biological materials in Brazil from 2011 through 2015: surveillance aspects. Rev Bras Med Trab 2020; 17:106-118. [PMID: 32270111 DOI: 10.5327/z1679443520190305] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Accepted: 01/14/2019] [Indexed: 11/05/2022] Open
Abstract
Background Accidents involving biological materials among healthcare providers represent a significant public health problem since they increase the risk of acquisition of viral infections considered to be risk factors for cancer. Objective To describe the profile of workplace accidents involving biological materials for healthcare providers. Method The profile of accidents for the period from 2011 to 2015 was described based on several sociodemographic, occupational and health variables. Specific incidence rates were stratified in three levels to categorize the Brazilian municipalities as a function of the frequency of events. Results Victims were mainly female, nursing technicians and assistants, events mostly occurred during surgical procedures or intravenous medication administration, however, underreporting cannot be ruled out. Conclusion The results point to the need for preventive programs to ensure the physical integrity of healthcare professionals, including continuous training, discussion and participation of the involved parties to achieve a positive impact.
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Affiliation(s)
- Helen Paredes de Souza
- Environment, Work and Cancer Technical Area, Prevention and Surveillance Coordination, Jose de Alencar Gomes da Silva National Cancer Institute - Rio de Janeiro (RJ), Brazil
| | - Ubirani Barros Otero
- Environment, Work and Cancer Technical Area, Prevention and Surveillance Coordination, Jose de Alencar Gomes da Silva National Cancer Institute - Rio de Janeiro (RJ), Brazil
| | - Valéria Dos Santos Pinto da Silva
- Environment, Work and Cancer Technical Area, Prevention and Surveillance Coordination, Jose de Alencar Gomes da Silva National Cancer Institute - Rio de Janeiro (RJ), Brazil
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Obidin N, Tasnim F, Dagdeviren C. The Future of Neuroimplantable Devices: A Materials Science and Regulatory Perspective. Adv Mater 2020; 32:e1901482. [PMID: 31206827 DOI: 10.1002/adma.201901482] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2019] [Revised: 04/12/2019] [Indexed: 06/09/2023]
Abstract
The past two decades have seen unprecedented progress in the development of novel materials, form factors, and functionalities in neuroimplantable technologies, including electrocorticography (ECoG) systems, multielectrode arrays (MEAs), Stentrode, and deep brain probes. The key considerations for the development of such devices intended for acute implantation and chronic use, from the perspective of biocompatible hybrid materials incorporation, conformable device design, implantation procedures, and mechanical and biological risk factors, are highlighted. These topics are connected with the role that the U.S. Food and Drug Administration (FDA) plays in its regulation of neuroimplantable technologies based on the above parameters. Existing neuroimplantable devices and efforts to improve their materials and implantation protocols are first discussed in detail. The effects of device implantation with regards to biocompatibility and brain heterogeneity are then explored. Topics examined include brain-specific risk factors, such as bacterial infection, tissue scarring, inflammation, and vasculature damage, as well as efforts to manage these dangers through emerging hybrid, bioelectronic device architectures. The current challenges of gaining clinical approval by the FDA-in particular, with regards to biological, mechanical, and materials risk factors-are summarized. The available regulatory pathways to accelerate next-generation neuroimplantable devices to market are then discussed.
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Affiliation(s)
- Nikita Obidin
- MIT Media Lab, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Farita Tasnim
- MIT Media Lab, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Canan Dagdeviren
- MIT Media Lab, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
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Kobatake R, Doi K, Oki Y, Makihara Y, Umehara H, Kubo T, Tsuga K. Comparative Study of Surface Modification Treatment for Porous Titanium. J Oral Maxillofac Res 2020; 11:e5. [PMID: 32760478 PMCID: PMC7393927 DOI: 10.5037/jomr.2020.11205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Accepted: 06/04/2020] [Indexed: 11/28/2022]
Abstract
OBJECTIVES This study was to investigate suitable surface treatment methods for porous titanium by ex vivo study of material properties and calcium phosphate deposition in simulated body fluid. MATERIAL AND METHODS Porous titanium with acid (H2SO4 and HCl mixed acid) or alkali (NaOH) treatment was prepared. The surfaces were observed, and the weight change ratio (after and before surface treatment) and compression strength were measured. To investigate the apatite formation ability, each sample was immersed in simulated body fluid (SBF). Surface observations were performed, and the weight change ratio (before/after immersing SBF) and calcification (by alizarin red staining) were measured. RESULTS The acid group showed a martensitic micro-scale rough structure and the weight and mechanical strength greatly decreased compared to the other groups. The alkali group exhibited a nano-scale roughness structure with similar weight and mechanical strength. Following immersion in SBF, an apatite-like crystal layer in the alkali group was observed. The weight of all samples increased. The change in weight of the samples in the alkali, acid, and control groups were significantly different, showing the following trend: alkali group (1.6%) > acid group (1.2%) > control group (0.8%). Calcium precipitation values were higher in the samples from alkali group than in those from the acid and control groups. CONCLUSIONS Alkali treatment was found to be a suitable surface modification method for porous titanium, resulting in good mechanical strength and apatite formation ability in simulated body fluid.
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Affiliation(s)
- Reiko Kobatake
- Department of Advanced Prosthodontics, Hiroshima University Graduate School of Biomedical and Health Sciences, HiroshimaJapan.
| | - Kazuya Doi
- Department of Advanced Prosthodontics, Hiroshima University Graduate School of Biomedical and Health Sciences, HiroshimaJapan.
| | - Yoshifumi Oki
- Department of Advanced Prosthodontics, Hiroshima University Graduate School of Biomedical and Health Sciences, HiroshimaJapan.
| | - Yusuke Makihara
- Department of Advanced Prosthodontics, Hiroshima University Graduate School of Biomedical and Health Sciences, HiroshimaJapan.
| | - Hanako Umehara
- Department of Advanced Prosthodontics, Hiroshima University Graduate School of Biomedical and Health Sciences, HiroshimaJapan.
| | - Takayasu Kubo
- Department of Advanced Prosthodontics, Hiroshima University Graduate School of Biomedical and Health Sciences, HiroshimaJapan.
| | - Kazuhiro Tsuga
- Department of Advanced Prosthodontics, Hiroshima University Graduate School of Biomedical and Health Sciences, HiroshimaJapan.
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Jung AR, Park YH, Kim GE, Kim MY, Jeon SH, Kim HY, Kim SY, Oh SH, Lee JY. Stem Cell/Oxygen-Releasing Microparticle Enhances Erectile Function in a Cavernous Nerve Injury Model. Tissue Eng Part A 2020; 27:50-62. [PMID: 32122268 DOI: 10.1089/ten.tea.2019.0240] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Erectile dysfunction caused by damage to the cavernous nerve is a common complication of radical prostatectomy for patients with localized prostate cancer. Various studies have investigated repair of damaged tissue and prevention of fibrosis in the corpus cavernosum using stem cell therapy. However, stem cell therapy has limitations, including insufficient nutrient and oxygen supply to transplanted stem cells. This study investigated whether stem cell/oxygen-releasing hollow microparticles (HPs) had therapeutic effect on erectile dysfunction in a rat model of bilateral cavernous nerve injury (BCNI). Therapeutic effects were observed in the BCNI model at 1, 2, and 4 weeks postcavernous nerve injury. Erectile function further improved after treatment with stem cell/oxygen-releasing HP system compared with treatment with only stem cells at 4 weeks. Stem cell/oxygen-releasing HP system increased cyclic guanosine monophosphate (cGMP) level and neuronal nitric oxide synthase (nNOS), endothelial nitric oxide synthase (eNOS), α-smooth muscle actin (α-SMA), and muscarinic acetylcholine receptor 3 (M3) expression while decreasing fibrosis and apoptosis in the corpus cavernosum. Our results clearly show that stem cell survival increases around transplanted stem cell/oxygen-releasing hybrid system site. Taken together, an oxygen-releasing HP system supported prolonged stem cell survival, sustaining the paracrine effect of the stem cells, and consequently enhancing erectile function. These findings show promise with regard to prolonged stem cell survival in stem cell applications for various diseases and types of tissue damage. Impact statement In this study, we used an oxygen-releasing hollow microparticles (HPs) system with stem cells to attempt to overcome certain limitations of stem cell therapy, including insufficient nutrient and oxygen supplies for transplanted stem cells. Our results demonstrated that a stem cell/oxygen-releasing HP hybrid system could further improve erectile function, cyclic guanosine monophosphate (cGMP) level, and NOS level in a bilateral cavernous nerve injury rat model through prolonged stem cell survival. Our data suggest that a stem cell/oxygen-releasing HP system is a promising clinical treatment option for postprostatectomy erectile dysfunction. Furthermore, this system may be relevant in different disease therapies and regenerative medicine.
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Affiliation(s)
- Ae Ryang Jung
- Department of Urology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.,Department of Urology, Cancer Research Institute, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.,Department of Biomedicine & Health Sciences, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Yong Hyun Park
- Department of Urology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Ga Eun Kim
- Department of Urology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.,Department of Urology, Cancer Research Institute, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.,Department of Biomedicine & Health Sciences, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Mee Young Kim
- Department of Urology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.,Department of Urology, Cancer Research Institute, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.,Department of Biomedicine & Health Sciences, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Seung Hwan Jeon
- Department of Urology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.,Department of Biomedicine & Health Sciences, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Ho Yong Kim
- Department of Nanobiomedical Science, Dankook University, Cheonan, Republic of Korea
| | - So Young Kim
- Department of Nanobiomedical Science, Dankook University, Cheonan, Republic of Korea
| | - Se Heang Oh
- Department of Nanobiomedical Science, Dankook University, Cheonan, Republic of Korea.,Department of Pharmaceutical Engineering, Dankook University, Cheonan, Republic of Korea
| | - Ji Youl Lee
- Department of Urology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.,Department of Urology, Cancer Research Institute, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.,Department of Biomedicine & Health Sciences, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
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Kupfer ME, Lin WH, Ravikumar V, Qiu K, Wang L, Gao L, Bhuiyan DB, Lenz M, Ai J, Mahutga RR, Townsend D, Zhang J, McAlpine MC, Tolkacheva EG, Ogle BM. In Situ Expansion, Differentiation, and Electromechanical Coupling of Human Cardiac Muscle in a 3D Bioprinted, Chambered Organoid. Circ Res 2020; 127:207-224. [PMID: 32228120 DOI: 10.1161/circresaha.119.316155] [Citation(s) in RCA: 131] [Impact Index Per Article: 32.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
RATIONALE One goal of cardiac tissue engineering is the generation of a living, human pump in vitro that could replace animal models and eventually serve as an in vivo therapeutic. Models that replicate the geometrically complex structure of the heart, harboring chambers and large vessels with soft biomaterials, can be achieved using 3-dimensional bioprinting. Yet, inclusion of contiguous, living muscle to support pump function has not been achieved. This is largely due to the challenge of attaining high densities of cardiomyocytes-a notoriously nonproliferative cell type. An alternative strategy is to print with human induced pluripotent stem cells, which can proliferate to high densities and fill tissue spaces, and subsequently differentiate them into cardiomyocytes in situ. OBJECTIVE To develop a bioink capable of promoting human induced pluripotent stem cell proliferation and cardiomyocyte differentiation to 3-dimensionally print electromechanically functional, chambered organoids composed of contiguous cardiac muscle. METHODS AND RESULTS We optimized a photo-crosslinkable formulation of native ECM (extracellular matrix) proteins and used this bioink to 3-dimensionally print human induced pluripotent stem cell-laden structures with 2 chambers and a vessel inlet and outlet. After human induced pluripotent stem cells proliferated to a sufficient density, we differentiated the cells within the structure and demonstrated function of the resultant human chambered muscle pump. Human chambered muscle pumps demonstrated macroscale beating and continuous action potential propagation with responsiveness to drugs and pacing. The connected chambers allowed for perfusion and enabled replication of pressure/volume relationships fundamental to the study of heart function and remodeling with health and disease. CONCLUSIONS This advance represents a critical step toward generating macroscale tissues, akin to aggregate-based organoids, but with the critical advantage of harboring geometric structures essential to the pump function of cardiac muscle. Looking forward, human chambered organoids of this type might also serve as a test bed for cardiac medical devices and eventually lead to therapeutic tissue grafting.
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Affiliation(s)
- Molly E Kupfer
- From the Department of Biomedical Engineering (M.E.K., W.-H.L., D.B.B., M.L., J.A., R.R.M., E.G.T., B.M.O.), University of Minnesota-Twin Cities, Minneapolis.,Stem Cell Institute (M.E.K., W.-H.L., B.M.O.), University of Minnesota-Twin Cities, Minneapolis
| | - Wei-Han Lin
- From the Department of Biomedical Engineering (M.E.K., W.-H.L., D.B.B., M.L., J.A., R.R.M., E.G.T., B.M.O.), University of Minnesota-Twin Cities, Minneapolis.,Stem Cell Institute (M.E.K., W.-H.L., B.M.O.), University of Minnesota-Twin Cities, Minneapolis
| | - Vasanth Ravikumar
- Department of Electrical Engineering (V.R.), University of Minnesota-Twin Cities, Minneapolis
| | - Kaiyan Qiu
- Department of Mechanical Engineering (K.Q., M.C.M.), University of Minnesota-Twin Cities, Minneapolis
| | - Lu Wang
- Department of Biomedical Engineering, School of Medicine, School of Engineering, University of Alabama at Birmingham (L.W., L.G., J.Z.)
| | - Ling Gao
- Department of Biomedical Engineering, School of Medicine, School of Engineering, University of Alabama at Birmingham (L.W., L.G., J.Z.)
| | - Didarul B Bhuiyan
- From the Department of Biomedical Engineering (M.E.K., W.-H.L., D.B.B., M.L., J.A., R.R.M., E.G.T., B.M.O.), University of Minnesota-Twin Cities, Minneapolis
| | - Megan Lenz
- From the Department of Biomedical Engineering (M.E.K., W.-H.L., D.B.B., M.L., J.A., R.R.M., E.G.T., B.M.O.), University of Minnesota-Twin Cities, Minneapolis
| | - Jeffrey Ai
- From the Department of Biomedical Engineering (M.E.K., W.-H.L., D.B.B., M.L., J.A., R.R.M., E.G.T., B.M.O.), University of Minnesota-Twin Cities, Minneapolis
| | - Ryan R Mahutga
- From the Department of Biomedical Engineering (M.E.K., W.-H.L., D.B.B., M.L., J.A., R.R.M., E.G.T., B.M.O.), University of Minnesota-Twin Cities, Minneapolis
| | - DeWayne Townsend
- Lillehei Heart Institute (D.T., E.G.T., B.M.O.), University of Minnesota-Twin Cities, Minneapolis.,Department of Integrative Biology and Physiology (D.T.), University of Minnesota-Twin Cities, Minneapolis
| | - Jianyi Zhang
- Department of Biomedical Engineering, School of Medicine, School of Engineering, University of Alabama at Birmingham (L.W., L.G., J.Z.)
| | - Michael C McAlpine
- Department of Mechanical Engineering (K.Q., M.C.M.), University of Minnesota-Twin Cities, Minneapolis
| | - Elena G Tolkacheva
- From the Department of Biomedical Engineering (M.E.K., W.-H.L., D.B.B., M.L., J.A., R.R.M., E.G.T., B.M.O.), University of Minnesota-Twin Cities, Minneapolis.,Lillehei Heart Institute (D.T., E.G.T., B.M.O.), University of Minnesota-Twin Cities, Minneapolis.,Institute for Engineering in Medicine (E.G.T., B.M.O.), University of Minnesota-Twin Cities, Minneapolis
| | - Brenda M Ogle
- From the Department of Biomedical Engineering (M.E.K., W.-H.L., D.B.B., M.L., J.A., R.R.M., E.G.T., B.M.O.), University of Minnesota-Twin Cities, Minneapolis.,Stem Cell Institute (M.E.K., W.-H.L., B.M.O.), University of Minnesota-Twin Cities, Minneapolis.,Lillehei Heart Institute (D.T., E.G.T., B.M.O.), University of Minnesota-Twin Cities, Minneapolis.,Institute for Engineering in Medicine (E.G.T., B.M.O.), University of Minnesota-Twin Cities, Minneapolis.,Masonic Cancer Center (B.M.O.), University of Minnesota-Twin Cities, Minneapolis
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Csarnovics I, Burunkova J, Sviazhina D, Oskolkov E, Alkhalil G, Orishak E, Nilova L, Szabó I, Rutka P, Bene K, Bácsi A, Kökényesi S. Development and Study of Biocompatible Polyurethane-Based Polymer-Metallic Nanocomposites. Nanotechnol Sci Appl 2020; 13:11-22. [PMID: 32280204 PMCID: PMC7127852 DOI: 10.2147/nsa.s245071] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Accepted: 02/19/2020] [Indexed: 12/13/2022] Open
Abstract
INTRODUCTION In this work we selected components, developed technology and studied a number of parameters of polymer nanocomposite materials, remembering that the material would have high optical and good mechanical characteristics, good sorption ability in order to ensure high value of the optical signal for a short time while maintaining the initial geometric shape. In addition, if this nanocomposite is used for medicine and biology (biocompatible or biocidal materials or the creation of a sensor based on it), the material must be non-toxic and/or biocompatible. We study the creation of polymer nanocomposites which may be applied as biocompatible materials with new functional parameters. MATERIAL AND METHODS A number of polymer nanocomposites based on various urethane-acrylate monomers and nanoparticles of gold, silicon oxides, zinc and/or titanium oxides are obtained, their mechanical (microhardness) properties and wettability (contact angle) are studied. The set of required, biology-related properties of these materials, such as toxicity and sorption of microorganisms are also investigated in order to prove their possible applicability. RESULTS AND DISCUSSION The composition of the samples influences their microhardness and the value of contact angle, which means that varying with the monomer and the metallic, oxide nanoparticles composition, we could change these parameters. Besides it, the set of required, biology-related properties of these materials, such as toxicity and sorption of microorganisms were also investigated in order to prove their possible applicability. It was shown that the materials are non-toxic, the adhesion of microorganisms on their surface also could be varied by changing their composition. CONCLUSION The presented polymer nanocomposites with different compositions of monomer and the presence of nanoparticles in them are prospective material for a possible bio-application as it is biocompatible, not toxic. The sorption of microorganism could be varied depending on the type of bacterias, the monomer composition, and nanoparticles.
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Affiliation(s)
- István Csarnovics
- Institute of Physics, Faculty of Science and Technology, University of Debrecen, Debrecen, Hungary
| | - Julia Burunkova
- International Scientific and Research Institute of Bioengineering, School of Photonics, ITMO University, St., Petersburg, Russian Federation
| | - Danara Sviazhina
- International Scientific and Research Institute of Bioengineering, School of Photonics, ITMO University, St., Petersburg, Russian Federation
| | - Evgeniy Oskolkov
- International Scientific and Research Institute of Bioengineering, School of Photonics, ITMO University, St., Petersburg, Russian Federation
| | - George Alkhalil
- International Scientific and Research Institute of Bioengineering, School of Photonics, ITMO University, St., Petersburg, Russian Federation
| | - Elena Orishak
- Department of Medical Microbiology, Faculty of Preventive Medicine, North-Western State Medical University Named After I.I. Mechnikov, St., Petersburg, Russian Federation
| | - Ludmila Nilova
- Department of Medical Microbiology, Faculty of Preventive Medicine, North-Western State Medical University Named After I.I. Mechnikov, St., Petersburg, Russian Federation
| | - István Szabó
- Institute of Physics, Faculty of Science and Technology, University of Debrecen, Debrecen, Hungary
| | - Péter Rutka
- Institute of Physics, Faculty of Science and Technology, University of Debrecen, Debrecen, Hungary
| | - Krisztián Bene
- Department of Immunology, Faculty of Health, University of Debrecen, Debrecen, Hungary
| | - Attila Bácsi
- Department of Immunology, Faculty of Health, University of Debrecen, Debrecen, Hungary
| | - Sándor Kökényesi
- Institute of Physics, Faculty of Science and Technology, University of Debrecen, Debrecen, Hungary
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Zomer HD, Jeremias TDS, Ratner B, Trentin AG. Mesenchymal stromal cells from dermal and adipose tissues induce macrophage polarization to a pro-repair phenotype and improve skin wound healing. Cytotherapy 2020; 22:247-260. [PMID: 32234290 DOI: 10.1016/j.jcyt.2020.02.003] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Revised: 02/09/2020] [Accepted: 02/19/2020] [Indexed: 12/15/2022]
Abstract
The process of wound healing restores skin homeostasis but not full functionality; thus, novel therapeutic strategies are needed to accelerate wound closure and improve the quality of healing. In this context, tissue engineering and cellular therapies are promising approaches. Although sharing essential characteristics, mesenchymal stromal cells (MSCs) isolated from different tissues might have distinct properties. Therefore, the aim of this study was to comparatively investigate, by a mouse model in vivo assay, the potential use of dermal-derived MSCs (DSCs) and adipose tissue-derived MSCs (ASCs) in improving skin wound healing. Human DSCs and ASCs were delivered to full-thickness mouse wounds by a collagen-based scaffold (Integra Matrix). We found that the association of both DSCs and ASCs with the Integra accelerated wound closure in mice compared with the biomaterial only (control). Both types of MSCs stimulated angiogenesis and extracellular matrix remodeling, leading to better quality scars. However, the DSCs showed smaller scar size,superior extracellular matrix deposition, and greater number of cutaneous appendages. Besides, DSCs and ASCs reduced inflammation by induction of macrophage polarization from a pro-inflammatory (M1) to a pro-repair (M2) phenotype. In conclusion, both DSCs and ASCs were able to accelerate the healing of mice skin wounds and promote repair with scars of better quality and more similar to healthy skin than the empty scaffold. DSCs associated with Integra induced superior overall results than the Integra alone, whereas scaffolds with ASCs showed an intermediate effect, often not significantly better than the empty biomaterial.
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Affiliation(s)
- Helena Debiazi Zomer
- Department of Cell Biology, Embryology and Genetics, Federal University of Santa Catarina, Florianopolis, Santa Catarina, Brazil
| | - Talita da Silva Jeremias
- Department of Cell Biology, Embryology and Genetics, Federal University of Santa Catarina, Florianopolis, Santa Catarina, Brazil
| | - Buddy Ratner
- Department of Bioengineering, University of Washington, Seattle, Washington, USA
| | - Andrea Goncalves Trentin
- Department of Cell Biology, Embryology and Genetics, Federal University of Santa Catarina, Florianopolis, Santa Catarina, Brazil; National Institute of Science and Technology for Regenerative Medicine, Rio de Janeiro, Brazil.
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Polo CI, Sendyk WR, Correa L, Sendyk D, Deboni MCZ, Naclério-Homem MDG. Synergism between recombinant human bone morphogenetic protein 2/absorbable collagen sponge and bone substitutes favors vertical bone augmentation and the resorption rate of the biomaterials: Histomorphometric and 3D microcomputed tomography analysis. J Periodontol 2020; 91:1295-1306. [PMID: 32052436 DOI: 10.1002/jper.19-0571] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Revised: 01/25/2020] [Accepted: 01/28/2020] [Indexed: 11/06/2022]
Abstract
BACKGROUND Recombinant human bone morphogenetic protein 2 (rhBMP-2) is an osteoinductor frequently used for bone regeneration in oral and maxillofacial surgery. There is no consensus about the ideal carrier for this growth factor. The aim of this study was to compare the bone augmentation, bone microarchitecture, and biodegradation rate of additional carriers to rhBMP-2/absorbable collagen sponge (ACS) in a vertical guided bone regeneration model. METHODS Four titanium cylinders were fixed onto the calvaria of rabbits (n = 20) that received (n = 10) or not (n = 10) rhBMP-2/ACS in conjunction with one of the carriers: beta-tricalcium phosphate (β-TCP), biphasic calcium phosphate (BCP), bovine bone mineral (BBM) or blood clot. The samples were analyzed by means of microcomputed tomography and histomorphology after 14 weeks. RESULTS All the materials with rhBMP-2/ACS exhibited improvement on bone augmentation, mainly BCP (P = 0.033) and β-TCP (P = 0.038), in the upper portion of the cylinder. Although trabecular anisotropy was improved in all the materials groups, trabecular connectivity was diminished when the biomaterials received rhBMP-2/ACS. Resorption rate of the remaining biomaterial was improved by rhBMP-2/ACS, mainly in BBM (P <0.01) and β-TCP (P <0.01). BBM exhibited the highest osteoclast density compared with the other materials groups. CONCLUSIONS BCP and β-TCP biomaterials exhibited a synergic effect with rhBMP-2/ACS, acting as suitable and viable carriers for vertical bone augmentation. The addition of rhBMP-2 significantly affected the biodegradation of β-TCP and BBM, accelerating the resorption of these materials.
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Affiliation(s)
- Cristiane Ibanhes Polo
- Department of Oral and Maxillofacial Surgery and Traumatology, School of Dentistry, University of São Paulo (USP), São Paulo, Brazil
| | - Wilson Roberto Sendyk
- Department of Implantology, School of Dentistry, Santo Amaro University (UNISA), São Paulo, Brazil
| | - Luciana Correa
- Department of Stomatology, School of Dentistry, University of São Paulo (USP), São Paulo, Brazil
| | - Daniel Sendyk
- Department of Oral and Maxillofacial Surgery and Traumatology, School of Dentistry, University of São Paulo (USP), São Paulo, Brazil
| | - Maria Cristina Zindel Deboni
- Department of Oral and Maxillofacial Surgery and Traumatology, School of Dentistry, University of São Paulo (USP), São Paulo, Brazil
| | - Maria da Graça Naclério-Homem
- Department of Oral and Maxillofacial Surgery and Traumatology, School of Dentistry, University of São Paulo (USP), São Paulo, Brazil
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Gutiérrez Moreno JJ, Panagiotopoulos NT, Evangelakis GA, Lekka CE. Electronic Origin of α″ to β Phase Transformation in Ti-Nb-Based Thin Films upon Hf Microalloying. Materials (Basel) 2020; 13:ma13061288. [PMID: 32178419 PMCID: PMC7142957 DOI: 10.3390/ma13061288] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Revised: 03/06/2020] [Accepted: 03/09/2020] [Indexed: 06/10/2023]
Abstract
We present results on thin Ti-Nb-based films containing Hf at various concentrations grown by magnetron sputtering. The films exhibit α" patterns at Hf concentrations up to 11 at.%, while at 16 at.% Hf, the β-phase emerges as a stable structure. These findings were consolidated by ab initio calculations, according to which the α"-β transformation is manifested in the calculation of the electronic band energies for Hf contents between 11 and 18 at.%. It turns out that the β-phase transition originates from the Hf 5d contributions at the Fermi level and the Hf 6s hybridizations at low energies in the electronic density of states. Bonding-anti-bonding first neighbor features existing in the shifted plane destabilize the α″-phase, especially at high Hf concentrations, while the covalent-like features in the first neighborhood stabilize the corresponding plane of the β-phase. Thin films measurements and bulk total energy calculations agree that the lattice constants of both α″ and β phases increase upon Hf substitution. These results are important for the understanding of β-Ti-based alloys formation mechanisms and can be used for the design of suitable biocompatible materials.
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Affiliation(s)
| | | | | | - Christina E. Lekka
- Department of Materials Science and Engineering, University of Ioannina, 45110 Ioannina, Greece
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Abstract
Three-dimensional (3D)-engineered scaffolds have been widely investigated as drug delivery systems (DDS) or cancer models with the aim to develop effective cancer therapies. The in vitro and in vivo models developed via 3D printing (3DP) and tissue engineering concepts have significantly contributed to our understanding of cell-cell and cell-extracellular matrix interactions in the cancer microenvironment. Moreover, 3D tumor models were used to study the therapeutic efficiency of anticancer drugs. The present study aims to provide an overview of applying the 3DP and tissue engineering concepts for cancer studies with suggestions for future research directions. The 3DP technologies being used for the fabrication of personalized DDS have been highlighted and the potential technical approaches and challenges associated with the fused deposition modeling, the inkjet-powder bed, and stereolithography as the most promising 3DP techniques for drug delivery purposes are briefly described. Then, the advances, challenges, and future perspectives in tissue-engineered cancer models for precision medicine are discussed. Overall, future advances in this arena depend on the continuous integration of knowledge from cancer biology, biofabrication techniques, multiomics and patient data, and medical needs to develop effective treatments ultimately leading to improved clinical outcomes. Impact statement Three-dimensional printing (3DP) enables the fabrication of personalized medicines and drug delivery systems. The convergence of 3DP, tissue engineering concepts, and cancer biology could significantly improve our understanding of cancer biology and contribute to the development of new cancer therapies.
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Affiliation(s)
- Abbas Shafiee
- UQ Diamantina Institute, Translational Research Institute, The University of Queensland, Brisbane, Australia.,Centre in Regenerative Medicine, Institute of Health and Biomedical Innovation, Queensland University of Technology (QUT), Brisbane, Australia.,Royal Brisbane and Women's Hospital, Metro North Hospital and Health Service, Brisbane, Australia
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Mena Silva PA, Garcia IM, Nunes J, Visioli F, Castelo Branco Leitune V, Melo MA, Collares FM. Myristyltrimethylammonium Bromide (MYTAB) as a Cationic Surface Agent to Inhibit Streptococcus mutans Grown over Dental Resins: An In Vitro Study. J Funct Biomater 2020; 11:E9. [PMID: 32075267 DOI: 10.3390/jfb11010009] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Revised: 02/06/2020] [Accepted: 02/11/2020] [Indexed: 02/06/2023] Open
Abstract
This in vitro study evaluated the effect of myristyltrimethylammonium bromide (MYTAB) on the physical, chemical, and biological properties of an experimental dental resin. The resin was formulated with dental dimetacrylate monomers and a photoinitiator/co-initiator system. MYTAB was added at 0.5 (G0.5%), 1 (G1%), and 2 (G2%) wt %, and one group remained without MYTAB and was used as the control (GCtrl). The resins were analyzed for the polymerization kinetics, degree of conversion, ultimate tensile strength (UTS), antibacterial activity against Streptococcus mutans, and cytotoxicity against human keratinocytes. Changes in the polymerization kinetics profiling were observed, and the degree of conversion ranged from 57.36% (±2.50%) for G2% to 61.88% (±1.91%) for G0.5%, without a statistically significant difference among groups (p > 0.05). The UTS values ranged from 32.85 (±6.08) MPa for G0.5% to 35.12 (±5.74) MPa for GCtrl (p > 0.05). MYTAB groups showed antibacterial activity against biofilm formation from 0.5 wt % (p < 0.05) and against planktonic bacteria from 1 wt % (p < 0.05). The higher the MYTAB concentration, the higher the cytotoxic effect, without differences between GCtrl e G0.5% (p > 0.05). In conclusion, the addition of 0.5 wt % of MYTAB did not alter the physical and chemical properties of the dental resin and provided antibacterial activity without cytotoxic effect.
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Sbricoli L, Guazzo R, Annunziata M, Gobbato L, Bressan E, Nastri L. Selection of Collagen Membranes for Bone Regeneration: A Literature Review. Materials (Basel) 2020; 13:ma13030786. [PMID: 32050433 PMCID: PMC7040903 DOI: 10.3390/ma13030786] [Citation(s) in RCA: 102] [Impact Index Per Article: 25.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Revised: 01/23/2020] [Accepted: 02/05/2020] [Indexed: 12/22/2022]
Abstract
Several treatment modalities have been proposed to regenerate bone, including guided bone regeneration (GBR) where barrier membranes play an important role by isolating soft tissue and allowing bone to grow. Not all membranes biologically behave the same way, as they differ from their origin and structure, with reflections on their mechanical properties and on their clinical performance. Collagen membranes have been widely used in medicine and dentistry, because of their high biocompatibility and capability of promoting wound healing. Recently, collagen membranes have been applied in guided bone regeneration with comparable outcomes to non-resorbable membranes. Aim of this work is to provide a review on the main features, application, outcomes, and clinical employment of the different types of collagen membranes. Comparisons with non-resorbable membranes are clarified, characteristics of cross-linked collagen versus native collagen, use of different grafting materials and need for membrane fixation are explored in order to gain awareness of the indications and limits and to be able to choose the right membrane required by the clinical condition.
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Affiliation(s)
- Luca Sbricoli
- Department of Neurosciences, School of Dentistry, University of Padova, Via Giustiniani 2, 35100 Padova, Italy; (R.G.); (L.G.); (E.B.)
- Correspondence: ; Tel.: +39-0498212040
| | - Riccardo Guazzo
- Department of Neurosciences, School of Dentistry, University of Padova, Via Giustiniani 2, 35100 Padova, Italy; (R.G.); (L.G.); (E.B.)
| | - Marco Annunziata
- Multidisciplinary Department of Medical Surgical and Dental Specialties, University of Campania “Luigi Vanvitelli”, 80100 Naples, Italy; (M.A.); (L.N.)
| | - Luca Gobbato
- Department of Neurosciences, School of Dentistry, University of Padova, Via Giustiniani 2, 35100 Padova, Italy; (R.G.); (L.G.); (E.B.)
| | - Eriberto Bressan
- Department of Neurosciences, School of Dentistry, University of Padova, Via Giustiniani 2, 35100 Padova, Italy; (R.G.); (L.G.); (E.B.)
| | - Livia Nastri
- Multidisciplinary Department of Medical Surgical and Dental Specialties, University of Campania “Luigi Vanvitelli”, 80100 Naples, Italy; (M.A.); (L.N.)
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Ikawa T, Akizuki T, Ono W, Maruyama K, Okada M, Stavropoulos A, Izumi Y, Iwata T. Ridge reconstruction in damaged extraction sockets using tunnel β-tricalcium phosphate blocks: A 6-month histological study in beagle dogs. J Periodontal Res 2020; 55:496-502. [PMID: 31985082 DOI: 10.1111/jre.12735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Revised: 12/17/2019] [Accepted: 01/05/2020] [Indexed: 11/26/2022]
Abstract
OBJECTIVE The present study aimed to evaluate the histological outcome of tunnel β-TCP blocks grafting in extraction sockets missing the buccal bone wall, after 6 months of healing. BACKGROUND Tunnel β-tricalcium phosphate (β-TCP) blocks made of randomly organized tunnel-shaped β-TCP ceramics appeared promising for alveolar ridge preservation in tooth extraction sockets missing the buccal bone, in a previous study in dogs, with a 2-month healing time. METHODS In six beagle dogs, the maxillary first premolars were extracted and the buccal bone was surgically removed to create bone defects of 4 mm (mesio-distal) × 5 mm (apico-coronal) × 4 mm (bucco-palatal). Thus, extraction sockets missing the buccal bone plate were grated with tunnel β-TCP blocks (test) or left empty for spontaneous healing (control). Histology/histomorphometry was performed after 6 months of healing. RESULTS The horizontal bucco-palatal width of the alveolar ridge was significantly greater at test sites than at control sites. The amount of mineralized tissue was greater at test sites (57.8% ± 11.1%) than at control sites (28.9% ± 8.5%), while the amount of connective tissue was significantly greater at control sites (41.7% ± 6.4%) than at test sites (19.6% ± 9.2%). No significant difference was found between sites in terms of basic multicellular units and bone marrow. Residual β-TCP at test sites was 5.8% ± 3.2%. CONCLUSION Grafting with tunnel β-TCP block significantly limited the resorption of the alveolar ridge at extraction sockets missing the buccal bone compared with sites left to heal spontaneously, even after 6-month follow-up.
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Affiliation(s)
- Takahiro Ikawa
- Department of Periodontology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.,Department of Periodontology, Faculty of Odontology, Malmö University, Malmö, Sweden
| | - Tatsuya Akizuki
- Department of Periodontology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Wataru Ono
- Department of Periodontology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Kiichi Maruyama
- Oral Diagnosis and General Dentistry, University Hospital of Dentistry, Tokyo Medical and Dental University, Tokyo, Japan
| | - Munehiro Okada
- Department of Periodontology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Andreas Stavropoulos
- Department of Periodontology, Faculty of Odontology, Malmö University, Malmö, Sweden.,Division of Conservative Dentistry and Periodontology, University Clinic of Dentistry, Medical University of Vienna, Vienna, Austria
| | - Yuichi Izumi
- Department of Periodontology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.,Oral Care Perio Center, Southern TOHOKU General Hospital, Southern TOHOKU Research Institute for Neuroscience, Koriyama, Japan
| | - Takanori Iwata
- Department of Periodontology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
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115
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Refaei P, Jahromi MZ, Moughari AAK. Comparison of the microleakage of mineral trioxide aggregate, calcium-enriched mixture cement, and Biodentine orthograde apical plug. Dent Res J (Isfahan) 2020; 17:66-72. [PMID: 32055296 PMCID: PMC7001563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND One-visit apexification is a treatment of choice in necrotic immature open apex teeth. Calcium silicate base materials are suitable for this method. The purpose of this study was to investigate and compare the sealing efficiency of Biodentine, mineral trioxide aggregate (MTA) ProRoot, and calcium-enriched mixture (CEM) cement orthograde apical plug using bacterial leakage method. MATERIALS AND METHODS In this in vitro study a total of 70 extracted maxillary incisors were cleaned and shaped. A 1.1-mm standardized artificially open apex was created in all samples. The teeth were randomly divided into three experimental groups of 20, and two negative and positive control groups of 5. In experimental groups, 4-mm thick apical plugs of ProRoot MTA, CEM cement, or Biodentine were placed in an orthograde manner. Negative control samples were completely filled with MTA while positive control samples were left unfilled. Sealing efficiency was measured by bacterial leakage method, and results were analyzed by Kaplan-Meier and Chi-square tests. The level of significance was set at 0.05. RESULTS The highest number of turbidity was recorded for ProRoot MTA samples, while the lowest for Biodentine. There was a significant difference in the number of turbidity between ProRoot MTA and Biodentine groups (P < 0.001), but there was no significant difference between CEM cement and Biodentine (P = 0.133) and ProRoot MTA (P = 0.055). CONCLUSION Within the limitation of this in vitro study, Biodentine showed promising results as a substance with good-sealing efficiency.
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Affiliation(s)
- Poorandokht Refaei
- Department of Endodontics, Faculty of Dentistry, Islamic Azad University of Isfahan (Khorasgan) Branch, Isfahan, Iran
| | - Maryam Zare Jahromi
- Department of Endodontics, Faculty of Dentistry, Islamic Azad University of Isfahan (Khorasgan) Branch, Isfahan, Iran,Address for correspondence: Dr. Maryam Zare Jahromi, Department of Endodontics, Faculty of Dentistry, Islamic Azad University of Isfahan (Khorasgan) Branch, Isfahan, Iran. E-mail:
| | - Abbas Ali Khademi Moughari
- Dental Research Center, Department of Endodontics, Dental Research Institute/Isfahan University of Medical Sciences, Isfahan, Iran
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Sokolowski A, Sokolowski A, Schwarze U, Theisen K, Payer M, Lorenzoni M, Wegscheider W. Phycogenic bone substitutes for sinus floor augmentation: Histomorphometric comparison of hydroxyapatite and biphasic calcium phosphate in a randomised clinical pilot study. Int J Oral Implantol (Berl) 2020; 13:387-399. [PMID: 33491369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Aims: While numerous materials are available for sinus floor elevation, plant-based alternatives still hold promise of overcoming concerns about allogeneic or xenogeneic materials. Thus, the present authors designed a randomised clinical trial to histologically compare an almost pure hydroxyapatite (HA) to a biphasic calcium phosphate comprising 80% β-tricalcium phosphate (β-TCP) and 20% hydroxyapatite (β-TCP/HA), all of phycogenic origin. Materials and methods: Twenty patients scheduled for lateral window sinus floor elevation were randomised to either an HA or a β-TCP/HA group. Biopsy specimens were taken 3 months after sinus floor elevation and during implant surgery after 6 months. One ground section per biopsy specimen (N = 40) was stained, scanned and histomorphometrically analysed for new bone, old bone, soft tissue, graft, bone infiltration of graft, bone-to-graft contact and penetration depth. Results: At 6 months, more new bone was seen in the β-TCP/HA group (P = 0.011), whereas more residual graft was present and in more extensive contact with new bone in the HA group. More pronounced alterations, and smaller particle sizes, of graft surrounded and infiltrated by bone were seen in the β-TCP/HA group. The less extensive bone-to-graft contact in the β-TCP/ HA group reflected a more advanced state of resorption, while infiltration of residual graft material by bone was also increased in this group. Conclusions: Proper healing was seen in both groups, with the graft materials guiding the formation of new bone, which grew especially well through the particles of the highly osteoconductive and resorptive β-TCP/HA material. HA was very stable, without significant resorption, but was extensively in contact with new bone after 6 months.
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Li P, Schille C, Schweizer E, Kimmerle-Müller E, Rupp F, Han X, Heiss A, Richter A, Legner C, Klotz UE, Geis-Gerstorfer J, Scheideler L. Evaluation of a Zn-2Ag-1.8Au-0.2V Alloy for Absorbable Biocompatible Materials. Materials (Basel) 2019; 13:E56. [PMID: 31861956 DOI: 10.3390/ma13010056] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Revised: 12/13/2019] [Accepted: 12/16/2019] [Indexed: 02/01/2023]
Abstract
Zinc (Zn) and Zn-based alloys have been proposed as a new generation of absorbable metals mainly owing to the moderate degradation behavior of zinc between magnesium and iron. Nonetheless, mechanical strength of pure Zn is relatively poor, making it insufficient for the majority of clinical applications. In this study, a novel Zn–2Ag–1.8Au–0.2V (wt.%) alloy (Zn–Ag–Au–V) was fabricated and investigated for use as a potential absorbable biocompatible material. Microstructural characterization indicated an effective grain-refining effect on the Zn alloy after a thermomechanical treatment. Compared to pure Zn, the Zn–Ag–Au–V alloy showed significantly enhanced mechanical properties, with a yield strength of 168 MPa, an ultimate tensile strength of 233 MPa, and an elongation of 17%. Immersion test indicated that the degradation rate of the Zn–Ag–Au–V alloy in Dulbecco’s phosphate buffered saline was approximately 7.34 ± 0.64 μm/year, thus being slightly lower than that of pure Zn. Biocompatibility tests with L929 and Saos-2 cells showed a moderate cytotoxicity, alloy extracts at 16.7%, and 10% concentration did not affect metabolic activity and cell proliferation. Plaque formation in vitro was reduced, the Zn–Ag–Au–V surface inhibited adhesion and biofilm formation by the early oral colonizer Streptococcus gordonii, indicating antibacterial properties of the alloy.
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Gyak K, Jeon S, Ha L, Kim S, Kim J, Lee K, Choi H, Kim D. Magnetically Actuated SiCN-Based Ceramic Microrobot for Guided Cell Delivery. Adv Healthc Mater 2019; 8:e1900739. [PMID: 31596550 DOI: 10.1002/adhm.201900739] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2019] [Revised: 09/18/2019] [Indexed: 01/22/2023]
Abstract
A silicon carbonitride (SICN) ceramic microrobot, biocompatible and magnetically activable, is developed for the delivery of viable cells to defective tissue by sequential steps of microstructuring, magnetization, and cell loading. The ceramic carrier of porous cylindrical framework is fabricated by 3D laser lithography using a photocurable preceramic polymer, chemically modified polyvinylsilazane, and subsequent pyrolysis at 600 °C under an inert atmosphere. Magnetic nanoparticles (MNP) are integrated into the surface-modified ceramic carrier by thiol-ene click reaction. Finally, the microrobot is loaded with fibroblast cells, which can be guided by a rotating external magnetic field. The proposed ceramic microrobot is mechanically durable, adequately controllable with external magnetic field, and quite compatible with mammalian cells.
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Affiliation(s)
- Ki‐Won Gyak
- Center for Intelligent Microprocess of Pharmaceutical SynthesisDepartment of Chemical EngineeringPohang University of Science and Technology (POSTECH) Pohang 37673 Republic of Korea
| | - Sungwoong Jeon
- Department of Robotics EngineeringDGIST‐ETH Microrobot Research CenterDaegu Gyeongbuk Institute of Science and Technology (DGIST) 333, Techno jungang‐daero, Hyeonpung‐eup, Dalseong‐Gun Daegu 42988 Republic of Korea
| | - Laura Ha
- Center for Intelligent Microprocess of Pharmaceutical SynthesisDepartment of Chemical EngineeringPohang University of Science and Technology (POSTECH) Pohang 37673 Republic of Korea
| | - Sangwon Kim
- Department of Robotics EngineeringDGIST‐ETH Microrobot Research CenterDaegu Gyeongbuk Institute of Science and Technology (DGIST) 333, Techno jungang‐daero, Hyeonpung‐eup, Dalseong‐Gun Daegu 42988 Republic of Korea
| | - Jin‐young Kim
- Department of Robotics EngineeringDGIST‐ETH Microrobot Research CenterDaegu Gyeongbuk Institute of Science and Technology (DGIST) 333, Techno jungang‐daero, Hyeonpung‐eup, Dalseong‐Gun Daegu 42988 Republic of Korea
| | - Kwang‐Sup Lee
- Department of Advanced Materials and Chemical EngineeringHannam University Daejeon 34430 South Korea
| | - Hongsoo Choi
- Department of Robotics EngineeringDGIST‐ETH Microrobot Research CenterDaegu Gyeongbuk Institute of Science and Technology (DGIST) 333, Techno jungang‐daero, Hyeonpung‐eup, Dalseong‐Gun Daegu 42988 Republic of Korea
| | - Dong‐Pyo Kim
- Center for Intelligent Microprocess of Pharmaceutical SynthesisDepartment of Chemical EngineeringPohang University of Science and Technology (POSTECH) Pohang 37673 Republic of Korea
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Bonventre JV, Hurst FP, West M, Wu I, Roy-Chaudhury P, Sheldon M. A Technology Roadmap for Innovative Approaches to Kidney Replacement Therapies: A Catalyst for Change. Clin J Am Soc Nephrol 2019; 14:1539-1547. [PMID: 31562182 PMCID: PMC6777588 DOI: 10.2215/cjn.02570319] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The number of patients dialyzed for ESKD exceeds 500,000 in the United States and more than 2.6 million people worldwide, with the expectation that the worldwide number will double by 2030. The human cost of health and societal financial cost of ESKD is substantial. Dialytic therapy is associated with an unacceptably high morbidity and mortality rate and poor quality of life. Although innovation in many areas of science has been transformative, there has been little innovation in dialysis or alternatives for kidney replacement therapy (KRT) since its introduction approximately 70 years ago. Advances in kidney biology, stem cells and kidney cell differentiation protocols, biomaterials, sensors, nano/microtechnology, sorbents and engineering, and interdisciplinary approaches and collaborations can lead to disruptive innovation. The Kidney Health Initiative, a public-private partnership between the American Society of Nephrology and the US Food and Drug Administration, has convened a multidisciplinary group to create a technology roadmap for innovative approaches to KRT to address patients' needs. The Roadmap is a living document. It identifies the design criteria that must be considered to replace the myriad functions of the kidney, as well as scientific, technical, regulatory, and payor milestones required to commercialize and provide patient access to KRT alternatives. Various embodiments of potential solutions are discussed, but the Roadmap is agnostic to any particular solution set. System enablers are identified, including vascular access, biomaterial development, biologic and immunologic modulation, function, and safety monitoring. Important Roadmap supporting activities include regulatory alignment and innovative financial incentives and payment pathways. The Roadmap provides estimated timelines for replacement of specific kidney functions so that approaches can be conceptualized in ways that are actionable and attract talented innovators from multiple disciplines. The Roadmap has been used to guide the selection of KidneyX prizes for innovation in KRT.
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Affiliation(s)
- Joseph V Bonventre
- Division of Renal Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts; .,Harvard Stem Cell Institute, Cambridge, Massachusetts
| | | | | | - Iwen Wu
- Center for Biologics Evaluation and Research, Food and Drug Administration, Silver Spring, Maryland
| | - Prabir Roy-Chaudhury
- Division of Nephrology, Department of Medicine, University of North Carolina, Chapel Hill, North Carolina; and.,Department of Medicine, WG (Bill) Hefner VA Medical Center, Salisbury, North Carolina
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Barkarmo S, Longhorn D, Leer K, Johansson CB, Stenport V, Franco‐Tabares S, Kuehne SA, Sammons R. Biofilm formation on polyetheretherketone and titanium surfaces. Clin Exp Dent Res 2019; 5:427-437. [PMID: 31452954 PMCID: PMC6704035 DOI: 10.1002/cre2.205] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Revised: 05/09/2019] [Accepted: 05/14/2019] [Indexed: 11/12/2022] Open
Abstract
Objective Polyetheretherketone (PEEK) is a polymer used in devices in orthopedic and dental rehabilitation. The aim of this in vitro study was to compare biofilm formation by a range of important oral bacterial species on PEEK, blasted PEEK, commercially pure titanium (cp-Ti), and titanium-6 aluminium-4 vanadium (Ti6Al4V). Material and methods Coin-shaped samples were manufactured, and the surfaces were characterized using optical interferometry, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and contact angle measurements. Bacterial species of Streptococcus sanguinis, Streptococcus oralis, Enterococcus faecalis, and Streptococcus gordonii were cultured on the four material surfaces for varying amounts of time. Biofilms were quantified following staining with crystal violet. Results Roughness and contact angle results showed blasted PEEK > PEEK > cp-Ti = Ti6Al4V. There was increased biofilm formation on blasted PEEK by S. sanguinis, S. oralis, and S. gordonii, whereas the bacterial adhesion was similar on PEEK, cp-Ti, and Ti6Al4V. The bacterial growth of E. faecalis was significantly higher on cp-Ti compared with the other three groups. Conclusion The results, taking into consideration the biofilm formation, suggest that PEEK should perform as well as cp-Ti or TiAl6V4 when used as a dental restorative material.
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Affiliation(s)
- Sargon Barkarmo
- Department of Prosthetic Dentistry/Dental Materials ScienceInstitute of Odontology, Sahlgrenska Academy, University of GothenburgGothenburgSweden
| | - Daniel Longhorn
- School of Dentistry, College of Medical and Dental SciencesUniversity of BirminghamBirminghamUK
| | - Kiran Leer
- School of Dentistry, College of Medical and Dental SciencesUniversity of BirminghamBirminghamUK
- Institute of Microbiology and InfectionUniversity of BirminghamBirminghamUK
| | - Carina B. Johansson
- Department of Prosthetic Dentistry/Dental Materials ScienceInstitute of Odontology, Sahlgrenska Academy, University of GothenburgGothenburgSweden
| | - Victoria Stenport
- Department of Prosthetic Dentistry/Dental Materials ScienceInstitute of Odontology, Sahlgrenska Academy, University of GothenburgGothenburgSweden
| | - Sebastian Franco‐Tabares
- Department of Prosthetic Dentistry/Dental Materials ScienceInstitute of Odontology, Sahlgrenska Academy, University of GothenburgGothenburgSweden
| | - Sarah A. Kuehne
- School of Dentistry, College of Medical and Dental SciencesUniversity of BirminghamBirminghamUK
- Institute of Microbiology and InfectionUniversity of BirminghamBirminghamUK
| | - Rachel Sammons
- School of Dentistry, College of Medical and Dental SciencesUniversity of BirminghamBirminghamUK
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梁 晨, 张 维, 胡 浩, 王 起, 方 志, 许 克. [Comparison of effectiveness and complications between two different methods of augmentation cystoplasty]. Beijing Da Xue Xue Bao Yi Xue Ban 2019; 51:293-297. [PMID: 30996371 PMCID: PMC7441218 DOI: 10.19723/j.issn.1671-167x.2019.02.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Indexed: 06/09/2023]
Abstract
OBJECTIVE To compare the effectiveness and complications between enterocystoplasty and small intestinal submucosa (SIS) cystoplasty through follow-ups of patients with augmentation cystoplasty in Peking University People's Hospital, offering alternative approach for future treatment. METHODS In this study, retrospective analyses were carried out in 10 patients who underwent enterocystoplasty or SIS cystoplasty in Peking University People's Hospital from November 2011 to December 2016. Clinical data were collected including medical history, surgical procedures, laboratory examinations and complications. And then regular follow-ups were developed. Ten patients were separated into groups of enterocystoplasty (n=6) and SIS cystoplasty (n=4), to compare their outcomes. RESULTS Ten patients all completed the follow-up interview. Five cases underwent augmentation cystoplasty with sigmoid colon, one with ileum and four with SIS cystoplasty successfully. The mean operative time was (302.0±66.6) min, and blood loss was (167.0±135.0) mL. The outcomes of the group of SIS cystoplasty were better in respects of the time of operation, intestinal function recovery, postoperative hospitalization duration and drainage removal. The average scores of American Urological Association symptom score (AUASS), overactive bladder syndrome score (OABSS), International Consultation on Incontinence questionnaire short form (ICI-Q-SF), and O'Leary-Sant Questionnaire were all improved in two groups. Two cases carried clean intermittent self catheterazion and two used long-term indwelling catheter. There were three patients with dilations of renal pelvises and ureters consistently or during bladder was filling preoperatively, and the situations were not going bad after the operations. The short-term complications included two cases of postoperative infection, one case of mild intestinal obstruction and one case of metabolic acidosis. The long-term complications included one case of ureteroinstestinal anastomosis strictures, three of urinary tract infection and one of long-term metabolic acidosis. CONCLUSION Enterocystoplasty and SIS cystoplasty are both effective operations to improve symptoms and protect upper urinary function, with no severe complications. Cystoscopic results showed satisfactory mucosa regeneration after SIS cystoplaty in refractory interstitial cystitis/painful bladder syndrome. But the number of patients included were quite small and the follow-up period was not long enough. Prospective control study of larger number of patients with longer follow-ups are expected to find out the effectiveness and safety of SIS cystoplasty.
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Affiliation(s)
- 晨 梁
- />北京大学人民医院泌尿外科, 北京 100044Department of Urology, Peking University People’s Hospital, Beijing 100044, China
| | - 维宇 张
- />北京大学人民医院泌尿外科, 北京 100044Department of Urology, Peking University People’s Hospital, Beijing 100044, China
| | - 浩 胡
- />北京大学人民医院泌尿外科, 北京 100044Department of Urology, Peking University People’s Hospital, Beijing 100044, China
| | - 起 王
- />北京大学人民医院泌尿外科, 北京 100044Department of Urology, Peking University People’s Hospital, Beijing 100044, China
| | - 志伟 方
- />北京大学人民医院泌尿外科, 北京 100044Department of Urology, Peking University People’s Hospital, Beijing 100044, China
| | - 克新 许
- />北京大学人民医院泌尿外科, 北京 100044Department of Urology, Peking University People’s Hospital, Beijing 100044, China
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Abstract
This study reports on scaffold-based periodontal tissue engineering in a large preclinical animal model. A biphasic scaffold consisting of bone and periodontal ligament compartments manufactured by melt and solution electrospinning, respectively, was used for the delivery of in vitro matured cell sheets from 3 sources: gingival cells (GCs), bone marrow-derived mesenchymal stromal cells (Bm-MSCs), and periodontal ligament cells (PDLCs). The construct featured a 3-dimensional fibrous bone compartment with macroscopic pore size, while the periodontal compartment consisted of a flexible porous membrane for cell sheet delivery. The regenerative performance of the constructs was radiographically and histologically assessed in surgically created periodontal defects in sheep following 5 and 10 wk of healing. Histologic observation demonstrated that the constructs maintained their shape and volume throughout the entirety of the in vivo study and were well integrated with the surrounding tissue. There was also excellent tissue integration between the bone and periodontal ligament compartments as well as the tooth root interface, enabling the attachment of periodontal ligament fibers into newly formed cementum and bone. Bone coverage along the root surface increased between weeks 5 and 10 in the Bm-MSC and PDLC groups. At week 10, the micro-computed tomography results showed that the PDLC group had greater bone fill as compared with the empty scaffold, while the GC group had less bone than the 3 other groups (control, Bm-MSC, and PDLC). Periodontal regeneration, as measured by histologically verified new bone and cementum formation with obliquely inserted periodontal ligament fibers, increased between 5 and 10 wk for the empty, Bm-MSC, and PDLC groups, while the GC group was inferior to the Bm-MSC and PDLC groups at 10 wk. This study demonstrates that periodontal regeneration can be achieved via the utilization of a multiphasic construct, with Bm-MSCs and PDLCs obtaining superior results as compared with GC-derived cell sheets.
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Affiliation(s)
- C Vaquette
- 1 Queensland University of Technology, Brisbane, Australia.,2 Center in Regenerative Medicine, Institute of Health of Biomedical Innovation, Kelvin Grove, Australia.,3 School of Dentistry, The University of Queensland, Herston, Australia
| | - S Saifzadeh
- 1 Queensland University of Technology, Brisbane, Australia.,2 Center in Regenerative Medicine, Institute of Health of Biomedical Innovation, Kelvin Grove, Australia
| | - A Farag
- 3 School of Dentistry, The University of Queensland, Herston, Australia
| | - D W Hutmacher
- 1 Queensland University of Technology, Brisbane, Australia.,2 Center in Regenerative Medicine, Institute of Health of Biomedical Innovation, Kelvin Grove, Australia
| | - S Ivanovski
- 3 School of Dentistry, The University of Queensland, Herston, Australia
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123
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Stumbras A, Kuliesius P, Januzis G, Juodzbalys G. Alveolar Ridge Preservation after Tooth Extraction Using Different Bone Graft Materials and Autologous Platelet Concentrates: a Systematic Review. J Oral Maxillofac Res 2019; 10:e2. [PMID: 31069040 PMCID: PMC6498816 DOI: 10.5037/jomr.2019.10102] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/04/2019] [Accepted: 03/12/2019] [Indexed: 12/25/2022]
Abstract
Objectives To review and assess the efficiency of different post extraction socket preservation techniques. Material and Methods An electronic literature search was performed on the MEDLINE and Embase databases. The review included human studies published between from January 1st, 2007 to January 1st, 2018, in English. Outcome measures included dimensional changes and/or histological evaluation of alveolar bone. Results Twenty-six full text articles were reviewed, 16 of which met the inclusion criteria and were selected for the study. Autogenous tooth graft prevented vertical resorption the most: -0.28 (SD 0.13) mm, observation period (OP): 4 months, while the least effective approach was beta tri-calcium phosphate (β-TCP): -1.72 (SD 0.56) mm, OP: 4 months. Estimating horizontal resorption, the most effective technique was biphasic calcium sulphate (BCS) with β-TCP and hydroxyapatite (HA) - BCS + TCP + HA: 0.03 (SD 2.32) mm, OP: 4 months, while β-TCP was the least efficient: -1.45 (SD 0.4) mm, OP: 4 months. Evaluating residual graft particles (RG) and newly formed bone (NFB) ratio the best results were achieved with demineralized freeze-dried bone allograft: RG: 8.88%, NFB: 38.42%, OP: 5 months, whereas magnesium-enriched hydroxyapatite was least effective: RG: 40.82%, NFB: 31.85%, OP: 4 months. Conclusions This review revealed that even though there are numerous types of biomaterials for socket preservation none of them can completely stop alveolar bone loss after tooth extraction. Furthermore, lack of information about qualitative evaluation of bone was noticed indicating that further studies regarding this topic are needed.
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Affiliation(s)
- Arturas Stumbras
- Department of Maxillofacial Surgery, Lithuanian University of Health Sciences, KaunasLithuania
| | - Povilas Kuliesius
- Faculty of Odontology, Medical Academy, Lithuanian University of Health Sciences, KaunasLithuania
| | - Gintaras Januzis
- Department of Maxillofacial Surgery, Lithuanian University of Health Sciences, KaunasLithuania
| | - Gintaras Juodzbalys
- Department of Maxillofacial Surgery, Lithuanian University of Health Sciences, KaunasLithuania
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124
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Moura CEB, Queiroz Neto MF, Braz JKFS, de Medeiros Aires M, Silva Farias NB, Barboza CAG, Cavalcanti Júnior GB, Rocha HAO, Alves Junior C. Effect of plasma-nitrided titanium surfaces on the differentiation of pre-osteoblastic cells. Artif Organs 2019; 43:764-772. [PMID: 30779451 DOI: 10.1111/aor.13438] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Revised: 01/07/2019] [Accepted: 02/16/2019] [Indexed: 12/15/2022]
Abstract
A titanium surface nitrided by plasma contains nitrogen ions that guarantee resistance to corrosion and biocompatibility. Despite this, no descriptions concerning the influence of the expression of cell adhesion proteins and their influence on osteogenic cell differentiation are available. Thus, the present study aimed to assess the response of murine pre-osteoblastic cells (MC3T3-E1) cultured on nitrided titanium surfaces. Pre-osteoblastic cells were grown on polished titanium discs, used as controls, and on previously characterized plasma-nitrided titanium discs. Cells from both groups were submitted to the MTT cell viability test. The expressions of α5, α2, and β1 integrin were assessed by flow cytometry and immunofluorescence, while osteocalcin expression was assessed by flow cytometry. The nitrided surface presented higher α2 and β1 integrin expressions, as well as osteocalcin expression, when compared to the polished surface, with no alterations in cell viability. These findings seem to suggest that the plasma nitriding treatment produces a titanium surface with the potential for effective in vitro osseointegration.
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Affiliation(s)
- Carlos Eduardo B Moura
- Department of Animal Sciences, Federal Rural University of Semiarid Region (UFERSA), Mossoró, Brazil
| | - Moacir F Queiroz Neto
- Department of Animal Sciences, Federal Rural University of Semiarid Region (UFERSA), Mossoró, Brazil
| | - Janine Karla F S Braz
- Department of Animal Sciences, Federal Rural University of Semiarid Region (UFERSA), Mossoró, Brazil
| | | | - Naisandra B Silva Farias
- Department of Animal Sciences, Federal Rural University of Semiarid Region (UFERSA), Mossoró, Brazil
| | - Carlos Augusto G Barboza
- Department of Animal Sciences, Federal Rural University of Semiarid Region (UFERSA), Mossoró, Brazil
| | | | - Hugo Alexandre O Rocha
- Department of Animal Sciences, Federal Rural University of Semiarid Region (UFERSA), Mossoró, Brazil
| | - Clodomiro Alves Junior
- Department of Animal Sciences, Federal Rural University of Semiarid Region (UFERSA), Mossoró, Brazil
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Hartman M, Rauser M, Brucks M, Chalam KV. Evaluation of anterior capsular contraction syndrome after cataract surgery with commonly used intraocular lenses. Clin Ophthalmol 2018; 12:1399-1403. [PMID: 30122893 PMCID: PMC6087024 DOI: 10.2147/opth.s172251] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Purpose The purpose of this study was to compare the incidence of anterior capsular contraction syndrome (ACCS) in cataract patients after implantation with one of two most commonly used hydrophobic acrylic lenses. Setting This study included patients from Loma Linda University, Loma Linda, CA, USA. Design This study is a retrospective chart review. Methods In this study, 1,047 eyes of 811 patients with and without known ACCS risk factors who underwent successful phacoemulsification and intraocular lens (IOL) implantation were included. Eyes that sustained intraoperative capsular tears and patients with a postoperative follow-up of <1 month were excluded. Each patient underwent surgery by the same surgeon receiving either the SN60WF IOL or the ZCB00 IOL. The duration of postoperative follow-up along with the presence of ACCS and the dimensions of the anterior capsule opening in these cases were recorded. The incidence of ACCS between the two lenses was compared. Results ACCS was significantly (P=0.045) less frequent in those patients who received the ZCB00 lens compared to those who received the SN60WF lens, despite a significantly greater (P<0.0001) number of patients with ACCS risk factors in the ZCB00 cohort. Conclusion In a direct comparison of the ZCB00 and SN60WF IOLs, a lower incidence of ACCS was found with ZCB00 IOL.
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Affiliation(s)
- Matthew Hartman
- Department of Ophthalmology, Loma Linda University School of Medicine, Loma Linda, CA, USA
| | - Michael Rauser
- Department of Ophthalmology, Loma Linda University Eye Institute, Loma Linda, CA, USA,
| | - Matthew Brucks
- Department of Ophthalmology, Loma Linda University Eye Institute, Loma Linda, CA, USA,
| | - K V Chalam
- Department of Ophthalmology, Loma Linda University Eye Institute, Loma Linda, CA, USA,
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126
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Abstract
In lamellar bone, a network of highly oriented interconnected osteocytes is organized in concentric layers. Through their cellular processes contained within canaliculi, osteocytes are highly mechanosensitive and locally modulate bone remodeling. We review the recent developments demonstrating the significance of the osteocyte lacuno-canalicular network in bone maintenance around implant biomaterials. Drilling during implant site preparation triggers osteocyte apoptosis, the magnitude of which correlates with drilling speed and heat generation, resulting in extensive remodeling and delayed healing. In peri-implant bone, osteocytes physically communicate with implant surfaces via canaliculi and are responsive to mechanical loading, leading to changes in osteocyte numbers and morphology. Certain implant design features allow peri-implant osteocytes to retain a less aged phenotype, despite highly advanced extracellular matrix maturation. Physicochemical properties of anodically oxidized surfaces stimulate bone formation and remodeling by regulating the expression of RANKL (receptor activator of nuclear factor-κB ligand), RANK, and OPG (osteoprotegerin) from implant-adherent cells. Modulation of certain osteocyte-related molecular signaling mechanisms (e.g., sclerostin blockade) may enhance the biomechanical anchorage of implants. Evaluation of the peri-implant osteocyte lacuno-canalicular network should therefore be a necessary component in future investigations of osseointegration to more completely characterize the biological response to materials for load-bearing applications in dentistry and orthopedics.
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Affiliation(s)
- F A Shah
- 1 Department of Biomaterials, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden
| | - P Thomsen
- 1 Department of Biomaterials, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden
| | - A Palmquist
- 1 Department of Biomaterials, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden
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127
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Abstract
Craniofacial bones, separate from the appendicular skeleton, bear a significant amount of strain and stress generated from mastication-related muscles. Current research on the regeneration of craniofacial bone focuses on the reestablishment of an elaborate vascular network. In this review, current challenges and efforts particularly in advances of scaffold properties and techniques for vascularization remodeling in craniofacial bone tissue engineering will be discussed. A microenvironment of ischemia and hypoxia in the biomaterial core drives propagation and reorganization of endothelial progenitor cells (EPCs) to assemble into a primitive microvascular framework. Co-culture strategies and delivery of vasculogenic molecules enhance EPCs' differentiation and stimulate the host regenerative response to promote vessel sprouting and strength. To optimize structural and vascular integration, well-designed microstructures of scaffolds are biologically considered. Proper porous structures, matrix stiffness, and surface morphology of scaffolds have a profound influence on cell behaviors and thus affect revascularization. In addition, advanced techniques facilitating angiogenesis and vaculogenesis have also been discussed. Oxygen delivery biomaterials, scaffold-free cell sheet techniques, and arteriovenous loop-induced axial vascularization strategies bring us new understanding and powerful strategies to manage revascularization of large craniofacial bone defects. Although promising histological results have been achieved, the efficient perfusion and functionalization of newly formed vessels are still challenging.
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Affiliation(s)
- T Tian
- 1 State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - T Zhang
- 1 State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Y Lin
- 1 State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - X Cai
- 1 State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
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Lubiński W, Krzystolik K, Gosławski W, Kuprjanowicz L, Mularczyk M. Comparison of polypropylene and silicone Ahmed® glaucoma valves in the treatment of neovascular glaucoma: A 2-year follow-up. ADV CLIN EXP MED 2018. [PMID: 29521039 DOI: 10.17219/acem/66806] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
BACKGROUND Inflammation associated with biomaterials of Ahmed® glaucoma drainage devices may cause the formation of a capsule around the device and can thus have a significant influence on the level of intraocular pressure reduction. OBJECTIVES The objective of this study was to compare the clinical outcomes after the implantation of a polypropylene or silicone Ahmed® glaucoma valve in patients with neovascular glaucoma. MATERIAL AND METHODS In the study, 27 eyes with neovascular glaucoma (group 1) received silicon Ahmed® valves and 23 eyes (group 2) received polypropylene valves. The best corrected distance visual acuity (BCDVA), intraocular pressure (IOP) and number of anti-glaucomatous drugs were recorded preoperatively and during a follow-up period of 24 months after surgery. Success was defined by the following criteria: 1) intraocular pressure in the rage of 6-21 mm Hg; 2) IOP reduction of at least 30% relative to preoperative values. All complications were registered. RESULTS One month postoperatively, the mean BCDVA increased significantly in both groups compared to preoperative values (p < 0.001). These values did not change during the 24 months of follow-up examinations. The probability of success defined by criterion 1 at 24 months of observation was 66.7% for silicone and 27.3% for propylene valves group (p < 0.007). According to criterion 2, the difference in success between the groups was not statistically significant. The total number of complications that occurred in both groups during the 24 months of follow-up examinations was similar, except for a higher occurrence of Tenon's cyst formation in the group with a polypropylene valve (18% vs 35%; p < 0.04). CONCLUSIONS In patients with neovascular glaucoma, the implantation of a silicone valve is associated with a significantly higher probability of long-term reduction of IOP below 21 mm Hg and with a lower risk of valve encapsulation in comparison to polypropylene valves. The obtained results suggest that silicone Ahmed® valves are more effective in the treatment of patients with neovascular glaucoma.
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Affiliation(s)
- Wojciech Lubiński
- Department of Ophthalmology, Pomeranian Medical University, Szczecin, Poland
| | - Karol Krzystolik
- Department of Ophthalmology, Pomeranian Medical University, Szczecin, Poland
| | - Wojciech Gosławski
- Department of Ophthalmology, Pomeranian Medical University, Szczecin, Poland
| | - Leszek Kuprjanowicz
- Department of Ophthalmology, Pomeranian Medical University, Szczecin, Poland
| | - Maciej Mularczyk
- Chair and Department of Human and Clinical Anatomy, Pomeranian Medical University, Szczecin, Poland
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129
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Silva Gomes Ferreira PH, De Oliveira D, Duailibe De Deus CB, Okamoto R. Evaluation of the Different Biomaterials Used in Alveolar Cleft Defects in Children. Ann Maxillofac Surg 2018; 8:315-319. [PMID: 30693253 PMCID: PMC6327813 DOI: 10.4103/ams.ams_140_17] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
The aim of this study was to use a literature review to evaluate and compare the different biomaterials used in surgeries for the closure of the palatal and alveolar clefts as alternatives to isolated autografting. For the search strategy, the PubMed and Medline databases were used with the indexing terms "'cleft palate' (Mesh), 'biocompatible materials' (Mesh), and 'dentistry' (Mesh)." There was no restriction on language or publication time. After the research, 26 articles were found, and then, only the filter for clinical trials was selected. With this methodology, five articles were selected. The full texts have been carefully evaluated. The main issue among the five selected articles was the closure of a cleft palate and/or alveolar bone with the use of different types of biomaterials (e.g. autogenous bone from the iliac crest and chin, deproteinized bovine bone (DBB), β-tricalcium phosphate (β-TCP), synthetic resorption based on calcium sulfate, and the engineering of bone tissue); they evaluated preoperative and postoperative clinically and through imaging tests. The autogenous bone associated with DBB or β-TCP significantly reduces the amount of autogenous bone harvested from the iliac crest, morbidity, and the hospitalization of the patient, and the isolated use of bovine hydroxyapatite resulted in lower bone density compared to that from autogenous bone.
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Affiliation(s)
| | - Danila De Oliveira
- Department of Basic Sciences, Araçatuba Dental School, University Estadual Paulista, Araçatuba, São Paulo, Brazil
| | - Ciro Borges Duailibe De Deus
- Department of Surgery and Integrated Clinic, Araçatuba Dental School, University Estadual Paulista, Araçatuba, São Paulo, Brazil
| | - Roberta Okamoto
- Department of Basic Sciences, Araçatuba Dental School, University Estadual Paulista, Araçatuba, São Paulo, Brazil
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Guarnieri R, Testarelli L, Stefanelli L, De Angelis F, Mencio F, Pompa G, Di Carlo S. Bone Healing in Extraction Sockets Covered With Collagen Membrane Alone or Associated With Porcine-Derived Bone Graft: a Comparative Histological and Histomorphometric Analysis. J Oral Maxillofac Res 2017; 8:e4. [PMID: 29435206 PMCID: PMC5806041 DOI: 10.5037/jomr.2017.8404] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Accepted: 12/30/2017] [Indexed: 01/22/2023]
Abstract
Objectives The present paper reports data of a randomized study aimed to analyse and compare the histologic and histomorphometric aspects of bone healing in extraction sites covered with collagen membrane alone or associated with porcine-derived bone graft. Material and Methods Thirty patients, with single extraction sockets without severe bone wall defects in the premolar/molar region, were included. Ten extraction sockets were grafted with porcine-derived bone and covered with collagen membrane (group 1), 10 sites were covered with collagen membrane alone (group 2), and 10 sites healed spontaneously (group 3). After 4 months of healing, 26 (8 in group 1, 9 in group 2, and 9 in group 3) bone core specimens were harvested for histologic evaluation, then dental implants were placed. Results Sites in the group 1 and in the group 2 showed similar histologic and histomorphometric results without significantly differences in the percentage of vital bone (57.43% [SD 4.8] vs. 60.01% [SD 3.2]), and non-mineralized connective tissue 22.99% (SD 5.3) vs. 18.53% (SD 6.2). In group 1 a 16.57% (SD 3.8) of residual material was found. Conclusions Results showed that the use of collagen membrane alone or associated to porcine-derived bone improves the healing bone process compared to that of extraction sites spontaneously healed. Moreover, histomorphometric data related to bone quality, indicated that extraction sites without severe walls defects and with a vestibular bone thickness > 1.5 mm, treated with a low resorbtion rate collagen membrane alone, do not need more than 4 months for dental implant insertion.
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Affiliation(s)
- Renzo Guarnieri
- Department of Dental and Maxillofacial Sciences, School of Dentistry, University La Sapienza, RomeItaly
| | - Luca Testarelli
- Department of Dental and Maxillofacial Sciences, School of Dentistry, University La Sapienza, RomeItaly
| | - Luigi Stefanelli
- Department of Dental and Maxillofacial Sciences, School of Dentistry, University La Sapienza, RomeItaly
| | - Francesca De Angelis
- Department of Dental and Maxillofacial Sciences, School of Dentistry, University La Sapienza, RomeItaly
| | - Francesca Mencio
- Department of Dental and Maxillofacial Sciences, School of Dentistry, University La Sapienza, RomeItaly
| | - Giorgio Pompa
- Department of Dental and Maxillofacial Sciences, School of Dentistry, University La Sapienza, RomeItaly
| | - Stefano Di Carlo
- Department of Dental and Maxillofacial Sciences, School of Dentistry, University La Sapienza, RomeItaly
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131
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Takaseya T, Fumoto H, Zhu J, Shiose A, Kobayashi M, Fujiki M, Arakawa Y, Dessoffy R, Kramer LD, Fukamachi K. Acute Swine Model for Assessing Biocompatibility of Biomedical Interface Materials. Tissue Eng Part C Methods 2017; 24:69-73. [PMID: 28978282 DOI: 10.1089/ten.tec.2017.0310] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
We established an acute animal model for early, straightforward, and reproducible assessment of a biocompatible material interface. Bilateral femoral artery-to-vein shunts were created in 12 pigs: two tubes per shunt, the left two coated and the right two uncoated. We evaluated two groups: uncontrolled flow (UF; shunt flow unregulated) and controlled flow (CF; shunt flow ∼50 mL/min). For each case on each side, two shunts were evaluated: one for 1 h and the other for 3 h. Arterial blood gas and complete blood count were recorded at baseline, 1, and 3 h. Mean shunt flows were 532 ± 88 mL/min UF and 52 ± 8 mL/min CF. Differences in flow were much smaller in CF (0.5 mL/min; 1% of mean flow) than UF (24.8 mL/min; 5% of mean flow). In UF, significant changes occurred: in pH, from start of shunting through 1 h; in pO2 and pCO2, from start through 3 h. This swine model using bilateral femoral shunts with controlled blood flow provides a reliable, reproducible, easily implemented method by which to evaluate biocompatibility of device coatings at an early stage of investigation.
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Affiliation(s)
- Tohru Takaseya
- 1 Department of Biomedical Engineering, Lerner Research Institute , Cleveland Clinic, Cleveland, Ohio
| | - Hideyuki Fumoto
- 1 Department of Biomedical Engineering, Lerner Research Institute , Cleveland Clinic, Cleveland, Ohio
| | - Junmin Zhu
- 2 Chemical Abstracts Service , Columbus, Ohio
| | - Akira Shiose
- 1 Department of Biomedical Engineering, Lerner Research Institute , Cleveland Clinic, Cleveland, Ohio
| | - Mariko Kobayashi
- 1 Department of Biomedical Engineering, Lerner Research Institute , Cleveland Clinic, Cleveland, Ohio
| | - Masako Fujiki
- 1 Department of Biomedical Engineering, Lerner Research Institute , Cleveland Clinic, Cleveland, Ohio
| | - Yoko Arakawa
- 1 Department of Biomedical Engineering, Lerner Research Institute , Cleveland Clinic, Cleveland, Ohio
| | - Raymond Dessoffy
- 1 Department of Biomedical Engineering, Lerner Research Institute , Cleveland Clinic, Cleveland, Ohio
| | - Larry D Kramer
- 1 Department of Biomedical Engineering, Lerner Research Institute , Cleveland Clinic, Cleveland, Ohio
| | - Kiyotaka Fukamachi
- 1 Department of Biomedical Engineering, Lerner Research Institute , Cleveland Clinic, Cleveland, Ohio
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Abstract
Guided bone regeneration (GBR) is commonly used in combination with the installment of titanium implants. The application of a membrane to exclude non‐osteogenic tissues from interfering with bone regeneration is a key principle of GBR. Membrane materials possess a number of properties which are amenable to modification. A large number of membranes have been introduced for experimental and clinical verification. This prompts the need for an update on membrane properties and the biological outcomes, as well as a critical assessment of the biological mechanisms governing bone regeneration in defects covered by membranes. The relevant literature for this narrative review was assessed after a MEDLINE/PubMed database search. Experimental data suggest that different modifications of the physicochemical and mechanical properties of membranes may promote bone regeneration. Nevertheless, the precise role of membrane porosities for the barrier function of GBR membranes still awaits elucidation. Novel experimental findings also suggest an active role of the membrane compartment per se in promoting the regenerative processes in the underlying defect during GBR, instead of being purely a passive barrier. The optimization of membrane materials by systematically addressing both the barrier and the bioactive properties is an important strategy in this field of research.
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Affiliation(s)
- Ibrahim Elgali
- Department of Biomaterials, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.,BIOMATCELL VINN Excellence Center of Biomaterials and Cell Therapy, University of Gothenburg, Gothenburg, Sweden
| | - Omar Omar
- Department of Biomaterials, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.,BIOMATCELL VINN Excellence Center of Biomaterials and Cell Therapy, University of Gothenburg, Gothenburg, Sweden
| | - Christer Dahlin
- Department of Biomaterials, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.,BIOMATCELL VINN Excellence Center of Biomaterials and Cell Therapy, University of Gothenburg, Gothenburg, Sweden.,Department of Oral Maxillofacial Surgery/ENT, NU-Hospital organisation, Trollhättan, Sweden
| | - Peter Thomsen
- Department of Biomaterials, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.,BIOMATCELL VINN Excellence Center of Biomaterials and Cell Therapy, University of Gothenburg, Gothenburg, Sweden
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133
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Yanamandala M, Zhu W, Garry DJ, Kamp TJ, Hare JM, Jun HW, Yoon YS, Bursac N, Prabhu SD, Dorn GW, Bolli R, Kitsis RN, Zhang J. Overcoming the Roadblocks to Cardiac Cell Therapy Using Tissue Engineering. J Am Coll Cardiol 2017; 70:766-775. [PMID: 28774384 PMCID: PMC5553556 DOI: 10.1016/j.jacc.2017.06.012] [Citation(s) in RCA: 70] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Revised: 06/05/2017] [Accepted: 06/05/2017] [Indexed: 12/20/2022]
Abstract
Transplantations of various stem cells or their progeny have repeatedly improved cardiac performance in animal models of myocardial injury; however, the benefits observed in clinical trials have been generally less consistent. Some of the recognized challenges are poor engraftment of implanted cells and, in the case of human cardiomyocytes, functional immaturity and lack of electrical integration, leading to limited contribution to the heart's contractile activity and increased arrhythmogenic risks. Advances in tissue and genetic engineering techniques are expected to improve the survival and integration of transplanted cells, and to support structural, functional, and bioenergetic recovery of the recipient hearts. Specifically, application of a prefabricated cardiac tissue patch to prevent dilation and to improve pumping efficiency of the infarcted heart offers a promising strategy for making stem cell therapy a clinical reality.
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Affiliation(s)
- Mounica Yanamandala
- Department of Medicine, Montefiore Medical Center and Albert Einstein College of Medicine, Bronx, New York
| | - Wuqiang Zhu
- Department of Biomedical Engineering, The University of Alabama at Birmingham, Birmingham, Alabama
| | - Daniel J Garry
- Lillehei Heart Institute, University of Minnesota, Minneapolis, Minnesota
| | - Timothy J Kamp
- Department of Medicine, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin
| | - Joshua M Hare
- Department of Medicine, University of Miami Miller School of Medicine, Miami, Florida
| | - Ho-Wook Jun
- Department of Biomedical Engineering, The University of Alabama at Birmingham, Birmingham, Alabama
| | - Young-Sup Yoon
- Department of Medicine, Emory University, and Severance Biomedical Science Institute, Yonsei University College of Medicine, Atlanta, Georgia
| | - Nenad Bursac
- Department of Biomedical Engineering, Duke University, Durham, North Carolina
| | - Sumanth D Prabhu
- Department of Medicine, Division of Cardiovascular Disease, University of Alabama at Birmingham, Birmingham, Alabama
| | - Gerald W Dorn
- Center for Pharmacogenomics, Department of Medicine, Washington University School of Medicine, St. Louis, Missouri
| | - Roberto Bolli
- Institute of Molecular Cardiology, University of Louisville, Louisville, Kentucky
| | - Richard N Kitsis
- Department of Medicine, Montefiore Medical Center and Albert Einstein College of Medicine, Bronx, New York
| | - Jianyi Zhang
- Department of Biomedical Engineering, The University of Alabama at Birmingham, Birmingham, Alabama.
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134
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Torres ÉMD, Naldi LF, Bernades KO, Carvalho AL. Four-year follow-up of a polymethyl methacrylate-based bone cement graft for optimizing esthetics in maxillary anterior implants: a case report. Gen Dent 2017; 65:48-53. [PMID: 28682282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Tooth loss promotes bone and gingival tissue remodeling, thus breaking the harmony between the residual ridge and natural teeth. This is critical in the anterior region of the mouth, and the integration of several dental specialties is often essential to successful rehabilitation with implants. This article describes a multidisciplinary approach to implant-supported oral rehabilitation in the maxillary anterior region, presenting a new technique for optimizing esthetics in implants. A 19-year-old woman was missing her central and lateral incisors and had 2 dental implants in the lateral incisor sites. The patient exhibited deficient thickness of the alveolar edge, loss of lip support, and absence of gingival architecture, and the implants were improperly placed. A multidisciplinary team created a correct emergence profile through a polymethyl methacrylate-based bone cement graft along with connective tissue grafts. This technique may be a useful therapeutic adjunct in dental implantology, showing good predictability and regular healing procedures.
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135
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Rizwan M, Yahya R, Hassan A, Yar M, Azzahari AD, Selvanathan V, Sonsudin F, Abouloula CN. pH Sensitive Hydrogels in Drug Delivery: Brief History, Properties, Swelling, and Release Mechanism, Material Selection and Applications. Polymers (Basel) 2017; 9:E137. [PMID: 30970818 PMCID: PMC6432076 DOI: 10.3390/polym9040137] [Citation(s) in RCA: 288] [Impact Index Per Article: 41.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Revised: 04/06/2017] [Accepted: 04/06/2017] [Indexed: 01/01/2023] Open
Abstract
Improving the safety efficacy ratio of existing drugs is a current challenge to be addressed rather than the development of novel drugs which involve much expense and time. The efficacy of drugs is affected by a number of factors such as their low aqueous solubility, unequal absorption along the gastrointestinal (GI) tract, risk of degradation in the acidic milieu of the stomach, low permeation of the drugs in the upper GI tract, systematic side effects, etc. This review aims to enlighten readers on the role of pH sensitive hydrogels in drug delivery, their mechanism of action, swelling, and drug release as a function of pH change along the GI tract. The basis for the selection of materials, their structural features, physical and chemical properties, the presence of ionic pendant groups, and the influence of their pKa and pKb values on the ionization, consequent swelling, and targeted drug release are also highlighted.
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Affiliation(s)
- Muhammad Rizwan
- Department of Chemistry, Universiti Malaya, 50603 Kuala Lumpur, Malaysia.
| | - Rosiyah Yahya
- Department of Chemistry, Universiti Malaya, 50603 Kuala Lumpur, Malaysia.
| | - Aziz Hassan
- Department of Chemistry, Universiti Malaya, 50603 Kuala Lumpur, Malaysia.
| | - Muhammad Yar
- Interdisciplinary Research Center in Biomedical Materials, COMSATS Institute of Information Technology, 54000 Lahore, Pakistan.
| | | | - Vidhya Selvanathan
- Department of Chemistry, Universiti Malaya, 50603 Kuala Lumpur, Malaysia.
| | - Faridah Sonsudin
- Centre for Foundation Studies in Science, Universiti Malaya, 50603 Kuala Lumpur, Malaysia.
| | - Cheyma Naceur Abouloula
- Department of Physics, Faculty of Science Semlalia Marrakesh, Cadi Ayyad University, 40000 Marrakesh, Morocco.
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136
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Denes E, Barrière G, Poli E, Lévêque G. Commentary: Bioceramics and Scaffolds: A Winning Combination for Tissue Engineering. Front Bioeng Biotechnol 2017; 5:15. [PMID: 28337435 PMCID: PMC5340796 DOI: 10.3389/fbioe.2017.00015] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2016] [Accepted: 02/16/2017] [Indexed: 11/13/2022] Open
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137
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Aymerich M, Nieto D, Álvarez E, Flores-Arias MT. Laser Surface Microstructuring of Biocompatible Materials Using a Microlens Array and the Talbot Effect: Evaluation of the Cell Adhesion. Materials (Basel) 2017; 10:E214. [PMID: 28772574 DOI: 10.3390/ma10020214] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Revised: 02/14/2017] [Accepted: 02/16/2017] [Indexed: 11/25/2022]
Abstract
A laser based technique for microstructuring titanium and tantalum substrates using the Talbot effect and an array of microlenses is presented. By using this hybrid technique; we are able to generate different patterns and geometries on the top surfaces of the biomaterials. The Talbot effect allows us to rapidly make microstructuring, solving the common problems of using microlenses for multipatterning; where the material expelled during the ablation of biomaterials damages the microlens. The Talbot effect permits us to increase the working distance and reduce the period of the patterns. We also demonstrate that the geometries and patterns act as anchor points for cells; affecting the cell adhesion to the metallic substrates and guiding how they spread over the material.
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138
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Abstract
Hyposalivation contributes to dental caries, periodontitis, and microbial infections. Additionally, it impairs activities of daily living (e.g., speaking, chewing, and swallowing). Treatments for hyposalivation are currently limited to medications (e.g., the muscarinic receptor agonists pilocarpine and cevimeline) that induce saliva secretion from residual acinar cells and the use of saliva substitutes. However, given that these therapies provide only temporary relief, the development of alternative treatments to restore gland function is essential. Previous studies demonstrated that laminin 1 (L1) is critical for intact salivary cell cluster formation and organization. However, the full L1 sequence is not suitable for clinical applications, as each protein domain may contribute to unwanted effects, such as degradation, tumorigenesis, and immune responses that, when compounded, outweigh the potential benefits provided by their sum. Although the L1 peptides YIGSR and A99 linked to fibrin hydrogels (FHs) promote intact salivary epithelial formation in vitro, little is known about their role during salivary gland regeneration in vivo. Therefore, the goal of this study was to demonstrate whether L1 peptides conjugated to FHs promote tissue regeneration in a wound-healing model of mouse submandibular glands (mSMGs). Our results suggest that YIGSR-A99 peptides, chemically conjugated to FHs and applied to wounded mSMGs in vivo, formed new organized salivary tissue. In contrast, wounded mSMGs treated with FHs alone or in the absence of a scaffold showed disorganized collagen formation and poor tissue healing. Together these studies indicate that damaged salivary gland tissue can grow and differentiate when treated with FHs containing L1 peptides.
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Affiliation(s)
- K Nam
- 1 School of Dentistry, The University of Utah, Salt Lake City, UT, USA
| | - C-S Wang
- 1 School of Dentistry, The University of Utah, Salt Lake City, UT, USA
| | - C L M Maruyama
- 1 School of Dentistry, The University of Utah, Salt Lake City, UT, USA
| | - P Lei
- 2 Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY, USA
| | - S T Andreadis
- 2 Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY, USA.,3 Department of Biomedical Engineering, School of Engineering and Applied Sciences, University at Buffalo, The State University of New York, Buffalo, NY, USA.,4 Center of Bioinformatics and Life Sciences, University at Buffalo, The State University of New York, Buffalo, NY, USA
| | - O J Baker
- 1 School of Dentistry, The University of Utah, Salt Lake City, UT, USA
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139
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Geng Z, Yuan Q, Zhuo X, Li Z, Cui Z, Zhu S, Liang Y, Liu Y, Bao H, Li X, Huo Q, Yang X. Synthesis, Characterization, and Biological Evaluation of Nanostructured Hydroxyapatite with Different Dimensions. Nanomaterials (Basel) 2017; 7:E38. [PMID: 28336873 PMCID: PMC5333023 DOI: 10.3390/nano7020038] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Revised: 01/25/2017] [Accepted: 01/29/2017] [Indexed: 01/03/2023]
Abstract
Nanosized hydroxyapatite (HA) is a promising candidate for a substitute for apatite in bone in biomedical applications. Furthermore, due to its excellent bone bioactivity, nanosized strontium-substituted HA (SrHA) has aroused intensive interest. However, the size effects of these nanoparticles on cellular bioactivity should be considered. In this study, nanosized HA and SrHA with different dimensions and crystallization were synthesized by hydrothermal methods. The phase, crystallization and chemical composition were analyzed by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR), respectively. The morphology was observed under field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). The degradation behaviors of the samples were monitored by determining the ions release profile with inductively coupled plasma mass spectrometry (ICP-MS). The releasing behavior of Ca2+ and Sr2+ showed that the degradation rate was proportional to the specific surface area and inversely proportional to crystallization. The in vitro experiment evaluated by MG63 cells showed that SrHA nanorods with a length greater than 100 nm had the best biological performance both in cell proliferation and differentiation (* p < 0.05 compared with HA-1 and SrHA-1; * p < 0.01 compared with HA-2). In addition, HA nanoparticles with a lower aspect ratio had better bioactivity than higher ones (* p < 0.05). This study demonstrated that nanosized HA and SrHA with subtle differences (including dimensions, crystallization, specific surface area, and degradation rate) could affect the cellular growth and thus might have an impact on bone growth in vivo. This work provides a view of the role of nano-HAs as ideal biocompatible materials in future clinical applications.
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Affiliation(s)
- Zhen Geng
- Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China.
| | - Qin Yuan
- School of Laboratory Medicine, Tianjin Medical University, Tianjin 300072, China.
| | - Xianglong Zhuo
- Department of Spinal Surgery, Liuzhou Worker's Hospital, Liuzhou 545001, China.
| | - Zhaoyang Li
- Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China.
- School of Materials Science and Engineering, Tianjin University, 92 Weijin Road, Tianjin 300072, China.
| | - Zhenduo Cui
- Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China.
| | - Shengli Zhu
- Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China.
| | - Yanqin Liang
- Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China.
| | - Yunde Liu
- School of Laboratory Medicine, Tianjin Medical University, Tianjin 300072, China.
| | - Huijing Bao
- School of Laboratory Medicine, Tianjin Medical University, Tianjin 300072, China.
| | - Xue Li
- School of Laboratory Medicine, Tianjin Medical University, Tianjin 300072, China.
| | - Qianyu Huo
- School of Laboratory Medicine, Tianjin Medical University, Tianjin 300072, China.
| | - Xianjin Yang
- Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China.
- School of Materials Science and Engineering, Tianjin University, 92 Weijin Road, Tianjin 300072, China.
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140
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Cruz LJ, Tacken PJ, Eich C, Rueda F, Torensma R, Figdor CG. Controlled release of antigen and Toll-like receptor ligands from PLGA nanoparticles enhances immunogenicity. Nanomedicine (Lond) 2017; 12:491-510. [PMID: 28181470 DOI: 10.2217/nnm-2016-0295] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
AIM Dendritic cells rapidly capture nanoparticles and induce a potent cellular immune response. It is yet unknown whether the immunological response induced by slow release of encapsulated versus soluble antigen and adjuvant is superior. MATERIALS & METHODS The kinetics of poly(lactic-co-glycolic acid) PLGA nanoparticles antigen release was studied by the DQ-bovine serum albumin (BSA) self-quenching antigen model. The immunological response induced was evaluated by means of dendritic cell activation/maturation markers, cytokine production and their ability to drive antigen-specific T-cell proliferation. RESULTS & CONCLUSION PLGA-encapsulated antigen and adjuvant showed an enhanced T-cell response when compared with soluble vaccine components by increasing antigenicity and adjuvanticity. Although the kinetic profile followed the same pattern, encapsulation increased strength and duration of the response.
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Affiliation(s)
- Luis J Cruz
- Department of Tumor Immunology, Radboud Insititute for Molecular Life Sciences, Radboud University Medical Center, Postbox 9101, 6500 HB Nijmegen, The Netherlands.,Translational Nanobiomaterials & Imaging, Department of Radiology, Leiden University Medical Center, Albinusdreef 2, 2333 ZA Leiden, The Netherlands
| | - Paul J Tacken
- Department of Tumor Immunology, Radboud Insititute for Molecular Life Sciences, Radboud University Medical Center, Postbox 9101, 6500 HB Nijmegen, The Netherlands
| | - Christina Eich
- Department of Tumor Immunology, Radboud Insititute for Molecular Life Sciences, Radboud University Medical Center, Postbox 9101, 6500 HB Nijmegen, The Netherlands
| | - Felix Rueda
- Department of Biochemistry & Molecular Biology, University of Barcelona, Diagonal 643, 08028 Barcelona, Spain
| | - Ruurd Torensma
- Department of Tumor Immunology, Radboud Insititute for Molecular Life Sciences, Radboud University Medical Center, Postbox 9101, 6500 HB Nijmegen, The Netherlands
| | - Carl G Figdor
- Department of Tumor Immunology, Radboud Insititute for Molecular Life Sciences, Radboud University Medical Center, Postbox 9101, 6500 HB Nijmegen, The Netherlands
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141
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Henmi Y, Naito Y, Jimbo R, Jinno Y, Sekine K, Hamada K. Bone Ingrowth to Ti Fibre Knit Block with High Deformability. J Oral Maxillofac Res 2017; 7:e2. [PMID: 28154746 PMCID: PMC5279768 DOI: 10.5037/jomr.2016.7402] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Accepted: 12/23/2016] [Indexed: 11/16/2022]
Abstract
Objectives The objective of this study is to develop a Ti fibre knit block without sintering, and to evaluate its deformability and new bone formation in vivo. Material and Methods A Ti fibre with a diameter of 150 μm was knitted to fabricate a Ti mesh tube. The mesh tube was compressed in a metal mould to fabricate porous Ti fibre knit blocks with three different porosities of 88%, 69%, and 50%. The elastic modulus and deformability were evaluated using a compression test. The knit block was implanted into bone defects of a rabbit’s hind limb, and new bone formation was evaluated using micro computed tomography (micro-CT) analysis and histological analysis. Results The knit blocks with 88% porosity showed excellent deformability, indicating potential appropriateness for bone defect filling. Although the porosities of the knit block were different, they indicated similar elastic modulus smaller than 1 GPa. The elastic modulus after deformation increased linearly as the applied compression stress increased. The micro-CT analysis indicated that in the block with 50% porosity new bone filled nearly all of the pore volume four weeks after implantation. In contrast, in the block with 88% porosity, new bone filled less than half of the pore volume even 12 weeks after implantation. The histological analysis also indicated new bone formation in the block. Conclusions The titanium fibre knit block with high porosity is potentially appropriate for bone defect filling, indicating good bone ingrowth after porosity reduction with applied compression.
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Affiliation(s)
- Yoko Henmi
- Department of Biomaterials and Bioengineering, Tokushima University Graduate School of Oral Science, Tokushima Japan
| | - Yoshihito Naito
- Oral Implant Center, Tokushima University Hospital, Tokushima Japan
| | - Ryo Jimbo
- Department of Oral and Maxillofacial Surgery and Oral Medicine, Malmö University, Malmö Sweden
| | - Yohei Jinno
- Department of Oral and Maxillofacial Surgery and Oral Medicine, Malmö University, Malmö Sweden
| | - Kazumitsu Sekine
- Department of Biomaterials and Bioengineering, Tokushima University Graduate School of Oral Science, Tokushima Japan
| | - Kenichi Hamada
- Department of Biomaterials and Bioengineering, Tokushima University Graduate School of Oral Science, Tokushima Japan
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142
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Scarisoreanu ND, Craciun F, Ion V, Birjega R, Bercea A, Dinca V, Dinescu M, Sima LE, Icriverzi M, Roseanu A, Gruionu L, Gruionu G. Lead-Free Piezoelectric (Ba,Ca)(Zr,Ti)O 3 Thin Films for Biocompatible and Flexible Devices. ACS Appl Mater Interfaces 2017; 9:266-278. [PMID: 28009160 DOI: 10.1021/acsami.6b14774] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In this work, we report the synthesis of functional biocompatible piezoelectric (1 - x)Ba(Ti0.8Zr0.2)TiO3-x(Ba0.7Ca0.3)TiO3, x = 0.45 (BCZT45), thin films with high piezoelectric properties. Pulsed-laser-based techniques, classical pulsed-laser deposition and matrix-assisted pulsed-laser evaporation, were used to synthesize the BCZT45 thin films. The second technique was employed in order to ensure growth on polymer flexible Kapton substrates. The BCZT45 thin films grown by both techniques show similar structural properties and high piezoelectric coefficient coupling between the mechanical loading and electrical potential. While it has long been shown that the electrical potential favors biological processes like osteogenesis, the assessment of cell adhesion and osteogenic differentiation onto BCZT materials has not yet been demonstrated. We prove here for the first time that BCZT 45 coatings on Kapton polymer substrates provide optimal support for osteogenic differentiation of mesenchymal stem cells in the bone marrow.
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Affiliation(s)
- N D Scarisoreanu
- National Institute for Laser, Plasma and Radiation Physics , 077125 Magurele, Romania
| | - F Craciun
- CNR-ISC, Istituto dei Sistemi Complessi , Area della Ricerca di Roma-Tor Vergata, Via del Fosso del Cavaliere 100, I-00133 Rome, Italy
| | - V Ion
- National Institute for Laser, Plasma and Radiation Physics , 077125 Magurele, Romania
| | - R Birjega
- National Institute for Laser, Plasma and Radiation Physics , 077125 Magurele, Romania
| | - A Bercea
- National Institute for Laser, Plasma and Radiation Physics , 077125 Magurele, Romania
| | - V Dinca
- National Institute for Laser, Plasma and Radiation Physics , 077125 Magurele, Romania
| | - M Dinescu
- National Institute for Laser, Plasma and Radiation Physics , 077125 Magurele, Romania
| | - L E Sima
- Institute of Biochemistry of the Romanian Academy , 296 Splaiul Independentei, 060031 Bucharest, Romania
| | - M Icriverzi
- Institute of Biochemistry of the Romanian Academy , 296 Splaiul Independentei, 060031 Bucharest, Romania
| | - A Roseanu
- Institute of Biochemistry of the Romanian Academy , 296 Splaiul Independentei, 060031 Bucharest, Romania
| | - L Gruionu
- Medinsys Craiova , Calea Unirii 32, 200409 Craiova, Romania
- Faculty of Mechanics, University of Craiova , Alexandru Ioan Cuza 13, 200585 Craiova, Romania
| | - G Gruionu
- Medinsys Craiova , Calea Unirii 32, 200409 Craiova, Romania
- Department of Surgery, Harvard Medical School and Massachusetts General Hospital , 55 Fruit Street White 506, Boston, Massachusetts 02114, United States
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143
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Volsky PG, Hillman TA, Stromberg KJ, Buchinsky FJ, Chen DA, Jackson NM, Arriaga MA. Hydroxyapatite cement cranioplasty following translabyrinthine approach: Long-term study of 369 cases. Laryngoscope 2017; 127:2120-2125. [PMID: 28059442 DOI: 10.1002/lary.26403] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2016] [Revised: 09/18/2016] [Accepted: 10/03/2016] [Indexed: 11/08/2022]
Abstract
OBJECTIVE To report the authors' experience with hydroxyapatite cement (HAC) cranioplasty and analyze the material's long-term safety and efficacy in repairing translabyrinthine skull-base defects by examining adverse events, specifically cerebrospinal fluid (CSF) leaks and surgical site infections. STUDY DESIGN Retrospective case-control study (primary study arm); prospective cross-sectional study of patients not examined within the last 5 years (secondary arm). SETTING tertiary-care neurotology private practice and academic practice (two centers). METHODS Hydroxyapatite cement implanted following translabyrinthine approach, with or without fat graft, was included. Combined approaches were excluded. Implant-associated adverse events were defined as 1) CSF leaks requiring reoperation or spinal drainage, and (2) infections requiring reoperation. Patients not examined within 5 years were interviewed by telephone to update their condition. Incidence of adverse events was compared to published data for translabyrinthine cranioplasty using fat graft alone. Implant survival analysis was performed. RESULTS The study cohort included 369 HAC implants in the same number of patients. There were seven CSF leaks and seven infections. Combined (n = 14) incidence of adverse events was 3.8% (2.09%, 6.28%). Compared to fat graft alone, the adverse events associated with HAC were fewer (P < 0.001). Up to 15 years (5,475 days), HAC cement maintained 95% adverse event-free survival. There were no cases of meningitis. CONCLUSION Cranioplasty using HAC with autologous fat following translabyrinthine skull-base surgery is safer and more effective than fat graft alone, up to 15 years after surgery. LEVEL OF EVIDENCE 4. Laryngoscope, 127:2120-2125, 2017.
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Affiliation(s)
- Peter G Volsky
- Pittsburgh Ear Associates, Philadelphia, Pennsylvania.,Division of Otolaryngology, Philadelphia, Pennsylvania
| | - Todd A Hillman
- Pittsburgh Ear Associates, Philadelphia, Pennsylvania.,Division of Otolaryngology, Philadelphia, Pennsylvania.,Allegheny Health Network, Pittsburgh, Philadelphia, Pennsylvania.,Department of Otolaryngology, Temple University, Philadelphia, Pennsylvania
| | - Kellen J Stromberg
- Department of Otolaryngology, Temple University, Philadelphia, Pennsylvania
| | | | - Douglas A Chen
- Pittsburgh Ear Associates, Philadelphia, Pennsylvania.,Allegheny Health Network, Pittsburgh, Philadelphia, Pennsylvania.,Department of Otolaryngology, Temple University, Philadelphia, Pennsylvania
| | - Neal M Jackson
- Department of Otolaryngology, Western Reserve Hospital, Cuyahoga Falls, Ohio
| | - Moisés A Arriaga
- Department of Otolaryngology, Baton Rouge, Louisiana.,Neurosurgery, Baton Rouge, Louisiana.,Louisiana State University New Orleans, Baton Rouge, Louisiana.,CNC Hearing and Balance Center, New Orleans, Baton Rouge, Louisiana.,Our Lady of the Lake Hearing and Balance Center, Baton Rouge, Louisiana
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144
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Borovjagin AV, Ogle BM, Berry JL, Zhang J. From Microscale Devices to 3D Printing: Advances in Fabrication of 3D Cardiovascular Tissues. Circ Res 2017; 120:150-165. [PMID: 28057791 PMCID: PMC5224928 DOI: 10.1161/circresaha.116.308538] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Revised: 10/03/2016] [Accepted: 10/19/2016] [Indexed: 01/14/2023]
Abstract
Current strategies for engineering cardiovascular cells and tissues have yielded a variety of sophisticated tools for studying disease mechanisms, for development of drug therapies, and for fabrication of tissue equivalents that may have application in future clinical use. These efforts are motivated by the need to extend traditional 2-dimensional (2D) cell culture systems into 3D to more accurately replicate in vivo cell and tissue function of cardiovascular structures. Developments in microscale devices and bioprinted 3D tissues are beginning to supplant traditional 2D cell cultures and preclinical animal studies that have historically been the standard for drug and tissue development. These new approaches lend themselves to patient-specific diagnostics, therapeutics, and tissue regeneration. The emergence of these technologies also carries technical challenges to be met before traditional cell culture and animal testing become obsolete. Successful development and validation of 3D human tissue constructs will provide powerful new paradigms for more cost effective and timely translation of cardiovascular tissue equivalents.
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Affiliation(s)
- Anton V Borovjagin
- From the Department of Biomedical Engineering, School of Medicine, School of Engineering, The University of Alabama at Birmingham (A.V.B., J.L.B., J.Z.); and Department of Biomedical Engineering, College of Science and Engineering, The University of Minnesota, Minneapolis (B.M.O.)
| | - Brenda M Ogle
- From the Department of Biomedical Engineering, School of Medicine, School of Engineering, The University of Alabama at Birmingham (A.V.B., J.L.B., J.Z.); and Department of Biomedical Engineering, College of Science and Engineering, The University of Minnesota, Minneapolis (B.M.O.)
| | - Joel L Berry
- From the Department of Biomedical Engineering, School of Medicine, School of Engineering, The University of Alabama at Birmingham (A.V.B., J.L.B., J.Z.); and Department of Biomedical Engineering, College of Science and Engineering, The University of Minnesota, Minneapolis (B.M.O.)
| | - Jianyi Zhang
- From the Department of Biomedical Engineering, School of Medicine, School of Engineering, The University of Alabama at Birmingham (A.V.B., J.L.B., J.Z.); and Department of Biomedical Engineering, College of Science and Engineering, The University of Minnesota, Minneapolis (B.M.O.).
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Pigossi SC, Medeiros MC, Saska S, Cirelli JA, Scarel-Caminaga RM. Role of Osteogenic Growth Peptide (OGP) and OGP(10-14) in Bone Regeneration: A Review. Int J Mol Sci 2016; 17:ijms17111885. [PMID: 27879684 PMCID: PMC5133884 DOI: 10.3390/ijms17111885] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2016] [Revised: 10/24/2016] [Accepted: 11/02/2016] [Indexed: 12/16/2022] Open
Abstract
Bone regeneration is a process that involves several molecular mediators, such as growth factors, which directly affect the proliferation, migration and differentiation of bone-related cells. The osteogenic growth peptide (OGP) and its C-terminal pentapeptide OGP(10–14) have been shown to stimulate the proliferation, differentiation, alkaline phosphatase activity and matrix mineralization of osteoblastic lineage cells. However, the exact molecular mechanisms that promote osteoblastic proliferation and differentiation are not completely understood. This review presents the main chemical characteristics of OGP and/or OGP(10–14), and also discusses the potential molecular pathways induced by these growth factors to promote proliferation and differentiation of osteoblasts. Furthermore, since these peptides have been extensively investigated for bone tissue engineering, the clinical applications of these peptides for bone regeneration are discussed.
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Affiliation(s)
- Suzane C Pigossi
- Department of Diagnosis and Surgery, School of Dentistry at Araraquara, UNESP-São Paulo State University, Humaita St, 1680, CEP 14801-903 Araraquara, São Paulo, Brazil.
- Department of Morphology, School of Dentistry, UNESP- São Paulo State University, Humaita St, 1680, CEP 14801-903 Araraquara, São Paulo, Brazil.
| | - Marcell C Medeiros
- Department of Diagnosis and Surgery, School of Dentistry at Araraquara, UNESP-São Paulo State University, Humaita St, 1680, CEP 14801-903 Araraquara, São Paulo, Brazil.
| | - Sybele Saska
- Department of General and Inorganic Chemistry, Institute of Chemistry, UNESP-São Paulo State University, Professor Francisco Degni St, 55, CEP 14800-900 Araraquara, São Paulo, Brazil.
| | - Joni A Cirelli
- Department of Diagnosis and Surgery, School of Dentistry at Araraquara, UNESP-São Paulo State University, Humaita St, 1680, CEP 14801-903 Araraquara, São Paulo, Brazil.
| | - Raquel M Scarel-Caminaga
- Department of Diagnosis and Surgery, School of Dentistry at Araraquara, UNESP-São Paulo State University, Humaita St, 1680, CEP 14801-903 Araraquara, São Paulo, Brazil.
- Department of Morphology, School of Dentistry, UNESP- São Paulo State University, Humaita St, 1680, CEP 14801-903 Araraquara, São Paulo, Brazil.
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146
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Tafaroji R, Biria M, Ameri F, Torabzadeh H, Qahari P, Akbarzadeh Baghban A. Effect of two fluoride varnishes on the color stability of three resin-based restorative materials: an in vitro study. ACTA ACUST UNITED AC 2016; 7:355-360. [PMID: 26174970 DOI: 10.1111/jicd.12172] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Accepted: 03/29/2015] [Indexed: 11/27/2022]
Abstract
AIM The aim of the present study was to evaluate the effect of two fluoride varnishes on color stability of three resin-based restorative materials. METHODS Fifty-four discs (14.5 × 1.7 mm) were fabricated from A2 and A3 shades of a compomer (F2000), a flowable composite (Z350), and a hybrid composite (Z250), and incubated at 37°C for 48 h. Dura Shield (colored) and Fluor Protector (colorless) fluoride varnishes were applied onto the discs. The coating was cleaned using a low-speed handpiece and nylon bristle brush after 24 h of storage in distilled water. A second coating was then applied. A control group with no coating was immersed in distilled water and used. The CIE L*a*b* color scale was measured before the treatments and following each cleaning utilizing a spectrophotometer. RESULTS The colored fluoride varnish exhibited the highest overall color change (∆E) after the first and the second cleaning procedures in all the materials. Among these, the greatest color change was observed in the A3 shade of F2000, followed by the A3 shade of Z-250. The ∆E was less than 3.3 in all groups, and was therefore clinically acceptable. CONCLUSION Color changes following the application of fluoride varnishes were found to be clinically acceptable in all groups.
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Affiliation(s)
- Raha Tafaroji
- Department of Pediatric Dentistry, Dental School, Islamic Azad University of Dentistry, Tehran, Iran.
| | - Mina Biria
- Department of Pediatric Dentistry, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Farhad Ameri
- Color physics Department, Institute for Color Science and Technology, Tehran, Iran
| | - Hassan Torabzadeh
- Restorative Dentistry Department, Dental Research Center, Shahid Beheshti Dental School, Tehran, Iran
| | - Pasha Qahari
- Department of Periodontology, Dental school, Babol University of Medical Sciences, Babol, Iran
| | - Alireza Akbarzadeh Baghban
- Department of Basic Sciences, School of Rehabilitation, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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147
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Yoo F, Wang MB, Bergsneider M, Suh JD. Single Layer Repair of Large Anterior Skull Base Defects without Vascularized Mucosal Flap. J Neurol Surg B Skull Base 2016; 78:139-144. [PMID: 28321377 DOI: 10.1055/s-0036-1593438] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Accepted: 08/22/2016] [Indexed: 10/20/2022] Open
Abstract
Objectives Bilateral anterior skull base (ASB) defects following endoscopic endonasal tumor resection are most commonly repaired utilizing multilayered reconstruction with a vascularized mucosal flap. Single-layer closure of large ASB defects has been described in the literature but this technique has yet to gain a widespread use. We report our experience with a series of patients who underwent reconstruction of large ASB defects using a single-layer intradural graft, without nasoseptal flaps. We also compared the use of acellular dermal matrix (AlloDerm, LifeCell, Branchburg, New Jersey, United States) or collagen matrix xenograft (Duramatrix, Stryker, Kalamazoo, Michigan, United States) as the graft biomaterial. Design A retrospective case series. Setting Tertiary academic medical center. Main Outcome Measures Postoperative cerebrospinal fluid leak, the number of postoperative debridements, the number of postoperative infections, and time to remucosalization. Results Two patients were reconstructed with AlloDerm and three with Duramatrix, with all patients receiving postoperative external beam radiation. There were no postoperative cerebrospinal fluid leaks identified in these patients during follow-up. The AlloDerm group showed increased postsurgical crusting, the number of clinically apparent postoperative infections, and an increased time to remucosalization. Conclusions Single-layer repair without a vascularized mucosal flap is a viable method of skull base repair for large ASB defects. We found repair with Duramatrix was superior, with less graft crusting and infection, requiring fewer debridements.
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Affiliation(s)
- Frederick Yoo
- Department of Head and Neck Surgery, UCLA David Geffen School of Medicine, Los Angeles, California, United States
| | - Marilene B Wang
- Department of Head and Neck Surgery, UCLA David Geffen School of Medicine, Los Angeles, California, United States
| | - Marvin Bergsneider
- Department of Neurosurgery, UCLA David Geffen School of Medicine, Los Angeles, California, United States
| | - Jeffrey D Suh
- Department of Head and Neck Surgery, UCLA David Geffen School of Medicine, Los Angeles, California, United States
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148
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Daugela P, Cicciù M, Saulacic N. Surgical Regenerative Treatments for Peri-Implantitis: Meta-analysis of Recent Findings in a Systematic Literature Review. J Oral Maxillofac Res 2016; 7:e15. [PMID: 27833740 PMCID: PMC5100640 DOI: 10.5037/jomr.2016.7315] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Accepted: 08/19/2016] [Indexed: 12/29/2022]
Abstract
Objectives The purpose of the present study was to systematically review the literature on the surgical regenerative treatment of the peri-implantitis and to determine an effective therapeutic predictable option for their clinical management. Material and Methods The study searched MEDLINE and EMBASE databases from 2006 to 2016. Clinical human studies that had reported changes in probing depth (PD) and/or bleeding on probing (BOP) and/or radiologic marginal bone level (RBL) changes after peri-implantitis surgical treatment at 12-month follow-up or longer were included accordingly to PRISMA guidelines. Results The initial search obtained 883 citations. After screening and determination of eligibility, 18 articles were included in the review. The meta-analysis of selected studies revealed that the weighted mean RBL fill was 1.97 mm (95% confidence interval [CI] = 1.58 to 2.35 mm), PD reduction was 2.78 mm (95% CI = 2.31 to 3.25 mm), and BOP reduced by 52.5% (95% CI = 41.6 to 63.1%). Defect fill in studies using and not using barrier membranes for graft coverage was 1.86 mm (95% CI = 1.36 to 2.36 mm) and 2.12 mm (95% CI = 1.46 to 2.78 mm) correspondingly. High heterogeneity among the studies regarding defects morphology, surgical protocols, and selection of biomaterials were found. Conclusions All included studies underlined an improvement of clinical conditions after the surgical regenerative treatment of peri-implantitis, however, there is a lack of scientific evidence in the literature regarding the superiority of the regenerative versus non-regenerative surgical treatment. The presence of a barrier membrane or submergence in the regenerative procedure does not seem to be fundamental in order to obtain clinical success of the surgery.
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Affiliation(s)
- Povilas Daugela
- Department of Maxillofacial Surgery, Lithuanian University of Health Sciences, Kaunas Lithuania
| | - Marco Cicciù
- Human Pathology Department, Messina University, Messina Italy
| | - Nikola Saulacic
- Department of Cranio-Maxillofacial Surgery, Faculty of Medicine, University of Bern, Bern Switzerland
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Baek S, Singh RK, Kim TH, Seo JW, Shin US, Chrzanowski W, Kim HW. Triple Hit with Drug Carriers: pH- and Temperature-Responsive Theranostics for Multimodal Chemo- and Photothermal Therapy and Diagnostic Applications. ACS Appl Mater Interfaces 2016; 8:8967-79. [PMID: 26926826 DOI: 10.1021/acsami.6b00963] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Currently there is a strong need for new drug delivery systems, which enable targeted and controlled function in delivering drugs while satisfying highly sensitive imaging modality for early detection of the disease symptoms and damaged sites. To meet these criteria we develop a system that integrates therapeutic and diagnostic capabilities (theranostics). Importantly, therapeutic efficacy of the system is enhanced by exploiting synergies between nanoparticles, drug, and hyperthermia. At the core of our innovation is near-infrared (NIR) responsive gold nanorods (Au) coated with drug reservoirs--mesoporous silica shell (mSi)--that is capped with thermoresponsive polymer. Such design of theranostics allows the detection of the system using computed tomography (CT), while finely controlled release of the drug is achieved by external trigger, NIR light irradiation--ON/OFF switch. Doxorubicin (DOX) was loaded into mSi formed on the gold core (Au@mSi-DOX). Pores were then capped with the temperature-sensitive poly(N-isopropylacrylamide)-based N-butyl imidazolium copolymer (poly(NIPAAm-co-BVIm)) resulting in a hybrid system-Au@mSi-DOX@P. A 5 min exposure to NIR induces polymer transition, which triggers the drug release (pores opening), increases local temperature above 43 °C (hyperthermia), and upregulates particle uptake (polymer becomes hydrophilic). The DOX release is also triggered by drop in pH enabling localized drug release when particles are taken up by cancer cells. Importantly, the synergies between chemo- and photothermal therapy for DOX-loaded theranostics were confirmed. Furthermore, higher X-ray attenuation value of the theranostics was confirmed via X-ray CT test indicating that the nanoparticles act as contrast agent and can be detected by CT.
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Affiliation(s)
- Seonmi Baek
- Faculty of Pharmacy, University of Sydney , NSW 2006, Australia
| | - Rajendra K Singh
- Department of Nanobiomedical Science & BK21 PLUS NBM Global Research Center for Regenerative Medicine, Dankook University , Cheonan 330-714, Republic of Korea
| | - Tae-Hyun Kim
- Department of Nanobiomedical Science & BK21 PLUS NBM Global Research Center for Regenerative Medicine, Dankook University , Cheonan 330-714, Republic of Korea
| | - Jae-won Seo
- Department of Nanobiomedical Science & BK21 PLUS NBM Global Research Center for Regenerative Medicine, Dankook University , Cheonan 330-714, Republic of Korea
| | - Ueon Sang Shin
- Department of Biomaterials Science, College of Dentistry, Dankook University , Cheonan 330-714, Republic of Korea
| | - Wojciech Chrzanowski
- Faculty of Pharmacy, University of Sydney , NSW 2006, Australia
- Charles Perkins Centre, The University of Sydney , NSW 2006, Australia
- Australian Institute of Nanoscale Science and Technology, The University of Sydney , NSW 2006, Australia
| | - Hae-Won Kim
- Department of Nanobiomedical Science & BK21 PLUS NBM Global Research Center for Regenerative Medicine, Dankook University , Cheonan 330-714, Republic of Korea
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Alcaide M, Taylor A, Fjorback M, Zachar V, Pennisi CP. Boron-Doped Nanocrystalline Diamond Electrodes for Neural Interfaces: In vivo Biocompatibility Evaluation. Front Neurosci 2016; 10:87. [PMID: 27013949 PMCID: PMC4781860 DOI: 10.3389/fnins.2016.00087] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Accepted: 02/22/2016] [Indexed: 11/13/2022] Open
Abstract
Boron-doped nanocrystalline diamond (BDD) electrodes have recently attracted attention as materials for neural electrodes due to their superior physical and electrochemical properties, however their biocompatibility remains largely unexplored. In this work, we aim to investigate the in vivo biocompatibility of BDD electrodes in relation to conventional titanium nitride (TiN) electrodes using a rat subcutaneous implantation model. High quality BDD films were synthesized on electrodes intended for use as an implantable neurostimulation device. After implantation for 2 and 4 weeks, tissue sections adjacent to the electrodes were obtained for histological analysis. Both types of implants were contained in a thin fibrous encapsulation layer, the thickness of which decreased with time. Although the level of neovascularization around the implants was similar, BDD electrodes elicited significantly thinner fibrous capsules and a milder inflammatory reaction at both time points. These results suggest that BDD films may constitute an appropriate material to support stable performance of implantable neural electrodes over time.
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Affiliation(s)
- María Alcaide
- Laboratory for Stem Cell Research, Department of Health Science and Technology, Aalborg University Aalborg, Denmark
| | - Andrew Taylor
- Institute of Physics, Academy of Sciences of the Czech Republic v.v.iPrague, Czech Republic; Nano6 s.r.o.Kladno, Czech Republic
| | | | - Vladimir Zachar
- Laboratory for Stem Cell Research, Department of Health Science and Technology, Aalborg University Aalborg, Denmark
| | - Cristian P Pennisi
- Laboratory for Stem Cell Research, Department of Health Science and Technology, Aalborg University Aalborg, Denmark
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