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Chen J. Current advances in anisotropic structures for enhanced osteogenesis. Colloids Surf B Biointerfaces 2023; 231:113566. [PMID: 37797464 DOI: 10.1016/j.colsurfb.2023.113566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2023] [Revised: 09/20/2023] [Accepted: 09/26/2023] [Indexed: 10/07/2023]
Abstract
Bone defects are a challenge to healthcare systems, as the aging population experiences an increase in bone defects. Despite the development of biomaterials for bone fillers and scaffolds, there is still an unmet need for a bone-mimetic material. Cortical bone is highly anisotropic and displays a biological liquid crystalline (LC) arrangement, giving it exceptional mechanical properties and a distinctive microenvironment. However, the biofunctions, cell-tissue interactions, and molecular mechanisms of cortical bone anisotropic structure are not well understood. Incorporating anisotropic structures in bone-facilitated scaffolds has been recognised as essential for better outcomes. Various approaches have been used to create anisotropic micro/nanostructures, but biomimetic bone anisotropic structures are still in the early stages of development. Most scaffolds lack features at the nanoscale, and there is no comprehensive evaluation of molecular mechanisms or characterisation of calcium secretion. This manuscript provides a review of the latest development of anisotropic designs for osteogenesis and discusses current findings on cell-anisotropic structure interactions. It also emphasises the need for further research. Filling knowledge gaps will enable the fabrication of scaffolds for improved and more controllable bone regeneration.
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Affiliation(s)
- Jishizhan Chen
- UCL Mechanical Engineering, University College London, WC1E 7JE, UK.
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2
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Park SH, Lei L, D'Souza D, Zipkin R, DiMartini ET, Atzampou M, Lallow EO, Shan JW, Zahn JD, Shreiber DI, Lin H, Maslow JN, Singer JP. Efficient electrospray deposition of surfaces smaller than the spray plume. Nat Commun 2023; 14:4896. [PMID: 37580341 PMCID: PMC10425365 DOI: 10.1038/s41467-023-40638-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Accepted: 08/02/2023] [Indexed: 08/16/2023] Open
Abstract
Electrospray deposition (ESD) is a promising technique for depositing micro-/nano-scale droplets and particles with high quality and repeatability. It is particularly attractive for surface coating of costly and delicate biomaterials and bioactive compounds. While high efficiency of ESD has only been successfully demonstrated for spraying surfaces larger than the spray plume, this work extends its utility to smaller surfaces. It is shown that by architecting the local "charge landscape", ESD coatings of surfaces smaller than plume size can be achieved. Efficiency approaching 100% is demonstrated with multiple model materials, including biocompatible polymers, proteins, and bioactive small molecules, on both flat and microneedle array targets. UV-visible spectroscopy and high-performance liquid chromatography measurements validate the high efficiency and quality of the sprayed material. Here, we show how this process is an efficient and more competitive alternative to other conformal coating mechanisms, such as dip coating or inkjet printing, for micro-engineered applications.
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Affiliation(s)
- Sarah H Park
- Department of Materials Science and Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ, 08854, USA
| | - Lin Lei
- Department of Mechanical and Aerospace Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ, 08854, USA
| | - Darrel D'Souza
- Department of Mechanical and Aerospace Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ, 08854, USA
| | | | - Emily T DiMartini
- Department of Biomedical Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ, 08854, USA
| | - Maria Atzampou
- Department of Biomedical Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ, 08854, USA
| | - Emran O Lallow
- Department of Mechanical and Aerospace Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ, 08854, USA
| | - Jerry W Shan
- Department of Mechanical and Aerospace Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ, 08854, USA
| | - Jeffrey D Zahn
- Department of Biomedical Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ, 08854, USA
| | - David I Shreiber
- Department of Biomedical Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ, 08854, USA
| | - Hao Lin
- Department of Mechanical and Aerospace Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ, 08854, USA
| | | | - Jonathan P Singer
- Department of Materials Science and Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ, 08854, USA.
- Department of Mechanical and Aerospace Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ, 08854, USA.
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3
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Moreira A, Madeira S, Buciumeanu M, Fialho J, Carvalho A, Silva F, Monteiro FJ, Caramês J. Design and surface characterization of micropatterned silica coatings for zirconia dental implants. J Mech Behav Biomed Mater 2022; 126:105060. [PMID: 34974323 DOI: 10.1016/j.jmbbm.2021.105060] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 12/15/2021] [Accepted: 12/20/2021] [Indexed: 11/16/2022]
Abstract
The use of zirconia as an alternative biomaterial for titanium implants has been increasing due to its biocompatibility, favorable aesthetic features, less potential for early plaque accumulation and mechanical properties. Despite the developed efforts, strategies to promote an effective osseointegration are still enough. In this sense and combining the silica properties to improve bone formation with the micropatterning guidance characteristics, silica coatings with micropatterns were designed and evaluated regarding their hydrophilicity and integrity through resistance to scratch and friction tests against femoral bone plates (simulating implant insertion). A combined sol-gel and soft-lithography techniques were used to produce silica coatings onto zirconia substrates and different techniques were used to characterize the micropatterned silica coatings. The results revealed that the production of lines and pillars micropatterns increases the surface roughness (Ra values) and improves the surface strength adhesion. Through the scratch test, it was possible to verify that the integrity and topography characteristics of all micropatterned coatings were not significantly affected after the friction test meaning that their function is not compromised after implant insertion. Additionally, the lines micropattern was the one that presented the highest hydrophilicity for distilled water, thus being a promising surface to promote improved osseointegration. The combined use of different surface micropatterns could potentially be used to guide bone apposition and avoiding peri-implantitis.
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Affiliation(s)
- André Moreira
- Department of Oral Surgery and Implant Dentistry, Faculdade de Medicina Dentária, Universidade de Lisboa, 1600-277, Lisboa, Portugal.
| | - Sara Madeira
- Center for Micro-Electro Mechanical Systems (CMEMS-UMinho), Universidade do Minho, Campus de Azurém, 4800-058, Guimarães, Portugal
| | - Mihaela Buciumeanu
- Faculty of Engineering, "Dunărea de Jos" University of Galaţi, Domnească 47, 800008, Galati, Romania
| | - Joana Fialho
- Escola Superior de Tecnologia e Gestão de Viseu, CI&DEI, Instituto Politécnico de Viseu, 3504-510 Viseu, Portugal
| | - Angela Carvalho
- i3S, Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Rua Alfredo Allen 208, 4200-135, Porto, Portugal; INEB, Instituto de Engenharia Biomédica, Universidade do Porto, Rua Alfredo Allen 208, 4200-135, Porto, Portugal
| | - Filipe Silva
- Center for Micro-Electro Mechanical Systems (CMEMS-UMinho), Universidade do Minho, Campus de Azurém, 4800-058, Guimarães, Portugal
| | - Fernando J Monteiro
- i3S, Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Rua Alfredo Allen 208, 4200-135, Porto, Portugal; INEB, Instituto de Engenharia Biomédica, Universidade do Porto, Rua Alfredo Allen 208, 4200-135, Porto, Portugal; Faculdade de Engenharia, Departamento de Engenharia Metalúrgica e Materiais, Universidade do Porto, Rua Dr Roberto Frias, s/n, 4200-465, Porto, Portugal
| | - João Caramês
- Department of Oral Surgery and Implant Dentistry, Faculdade de Medicina Dentária, Universidade de Lisboa, 1600-277, Lisboa, Portugal
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Early Intervention in Ischemic Tissue with Oxygen Nanocarriers Enables Successful Implementation of Restorative Cell Therapies. Cell Mol Bioeng 2020; 13:435-446. [PMID: 33184576 DOI: 10.1007/s12195-020-00621-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Accepted: 05/20/2020] [Indexed: 01/01/2023] Open
Abstract
Background Tissue ischemia contributes to necrosis and infection. While angiogenic cell therapies have emerged as a promising strategy against ischemia, current approaches to cell therapies face multiple hurdles. Recent advances in nuclear reprogramming could potentially overcome some of these limitations. However, under severely ischemic conditions necrosis could outpace reprogramming-based repair. As such, adjunctive measures are required to maintain a minimum level of tissue viability/activity for optimal response to restorative interventions. Methods Here we explored the combined use of polymerized hemoglobin (PolyHb)-based oxygen nanocarriers with Tissue Nano-Transfection (TNT)-driven restoration to develop tissue preservation/repair strategies that could potentially be used as a first line of care. Random-pattern cutaneous flaps were created in a mouse model of ischemic injury. PolyHbs with high and low oxygen affinity were synthesized and injected into the tissue flap at various timepoints of ischemic injury. The degree of tissue preservation was evaluated in terms of perfusion, oxygenation, and resulting necrosis. TNT was then used to deploy reprogramming-based vasculogenic cell therapies to the flaps via nanochannels. Reprogramming/repair outcomes were evaluated in terms of vascularity and necrosis. Results Flaps treated with PolyHbs exhibited a gradual decrease in necrosis as a function of time-to-intervention, with low oxygen affinity PolyHb showing the best outcomes. TNT-based intervention of the flap in combination with PolyHb successfully curtailed advanced necrosis compared to flaps treated with only PolyHb or TNT alone. Conclusions These results indicate that PolyHb and TNT technologies could potentially be synergistically deployed and used as early intervention measures to combat severe tissue ischemia.
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Surface Modification by Combination of Dip-Pen Nanolithography and Soft Lithography for Reduction of Bacterial Adhesion. JOURNAL OF NANOTECHNOLOGY 2018. [DOI: 10.1155/2018/8624735] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Dip-pen nanolithography (DPN) and soft lithography are techniques suitable to modify the surface of biomaterials. Modified surfaces might play a role in modulating cells and reducing bacterial adhesion and biofilm formation. The main objective of this study was threefold: first, to create patterns at microscale on model surfaces using DPN; second, to duplicate and transfer these patterns to a real biomaterial surface using a microstamping technique; and finally, to assess bacterial adhesion to these developed patterned surfaces using the cariogenic species Streptococcus mutans. DPN was used with a polymeric adhesive to create dot patterns on model surfaces. Elastomeric polydimethylsiloxane was used to duplicate the patterns and silica sol to transfer them to the medical grade stainless steel 316L surface by microstamping. Optical microscopy and atomic force microscopy (AFM) were used to characterize the patterns. S. mutans adhesion was assessed by colony-forming units (CFUs), MTT viability assay, and scanning electron microscopy (SEM). DPN allowed creating microarrays from 1 to 5 µm in diameter on model surfaces that were successfully transferred to the stainless steel 316L surface via microstamping. A significant reduction up to one order of magnitude in bacterial adhesion to micropatterned surfaces was observed. The presented experimental approach may be used to create patterns at microscale on a surface and transfer them to other surfaces of interest. A reduction in bacterial adhesion to patterned surfaces might have a major impact since adhesion is a key step in biofilm formation and development of biomaterial-related infections.
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A novel approach to create an antibacterial surface using titanium dioxide and a combination of dip-pen nanolithography and soft lithography. Sci Rep 2018; 8:15818. [PMID: 30361619 PMCID: PMC6202409 DOI: 10.1038/s41598-018-34198-w] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Accepted: 10/10/2018] [Indexed: 12/27/2022] Open
Abstract
Soft lithography and Dip-Pen Nanolithography (DPN) are techniques that have been used to modify the surface of biomaterials. Modified surfaces play a role in reducing bacterial adhesion and biofilm formation. Also, titanium dioxide has been reported as an antibacterial substance due to its photocatalytic effect. This work aimed at creating patterns on model surfaces using DPN and soft lithography combined with titanium dioxide to create functional antibacterial micropatterned surfaces, which were tested against Streptococcus mutans. DPN was used to create a master pattern onto a model surface and microstamping was performed to duplicate and transfer such patterns to medical-grade stainless steel 316L using a suspension of TiO2. Modified SS316L plates were subjected to UVA black light as photocatalytic activator. Patterns were characterized by atomic force microscopy and biologically evaluated using S. mutans. A significant reduction of up to 60% in bacterial adhesion to TiO2 -coated and -micropatterned surfaces was observed. Moreover, both TiO2 surfaces reduced the viability of adhered bacteria after UV exposure. TiO2 micropatterned demonstrated a synergic effect between physical and chemical modification against S. mutans. This dual effect was enhanced by increasing TiO2 concentration. This novel approach may be a promising alternative to reduce bacterial adhesion to surfaces.
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Galván-Chacón VP, Habibovic P. Deconvoluting the Bioactivity of Calcium Phosphate-Based Bone Graft Substitutes: Strategies to Understand the Role of Individual Material Properties. Adv Healthc Mater 2017; 6. [PMID: 28544743 DOI: 10.1002/adhm.201601478] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2016] [Revised: 03/24/2017] [Indexed: 02/06/2023]
Abstract
Calcium phosphate (CaP)-based ceramics are the most widely applied synthetic biomaterials for repair and regeneration of damaged and diseased bone. CaP bioactivity is regulated by a set of largely intertwined physico-chemical and structural properties, such as the surface microstructure, surface energy, porosity, chemical composition, crystallinity and stiffness. Unravelling the role of each individual property in the interaction between the biomaterial and the biological system is a prerequisite for evolving from a trial-and-error approach to a design-driven approach in the development of new functional biomaterials. This progress report critically reviews various strategies developed to decouple the roles of the individual material properties in the biological performance of CaP ceramics. It furthermore emphasizes on the importance of a comprehensive and adequate material characterization that is needed to enhance our knowledge of the property-function relationship of biomaterials used in bone regeneration, and in regenerative medicine in general.
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Affiliation(s)
| | - Pamela Habibovic
- MERLN Institute; Maastricht University; P.O. Box 616 6200 MD Maastricht The Netherlands
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Carvalho A, Pelaez-Vargas A, Hansford DJ, Fernandes MH, Monteiro FJ. Effects of Line and Pillar Array Microengineered SiO2 Thin Films on the Osteogenic Differentiation of Human Bone Marrow-Derived Mesenchymal Stem Cells. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:1091-100. [PMID: 26771563 DOI: 10.1021/acs.langmuir.5b03955] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A primary goal in bone tissue engineering is the design of implants that induce controlled, guided, and rapid healing. The events that normally lead to the integration of an implant into bone and determine the performance of the device occur mainly at the tissue-implant interface. Topographical surface modification of a biomaterial might be an efficient tool for inducing stem cell osteogenic differentiation and replace the use of biochemical stimuli. The main goal of this work was to develop micropatterned bioactive silica thin films to induce the osteogenic differentiation of human bone marrow-derived mesenchymal stem cells (hMSCs) only through topographical stimuli. Line and pillar micropatterns were developed by a combination of sol-gel/soft lithography and characterized by scanning electron microscopy, atomic force microscopy, and contact angle measurements. hMSCs were cultured onto the microfabricated thin films and flat control for up to 21 days under basal conditions. The micropatterned groups induced levels of osteogenic differentiation and expression of osteoblast-associated markers higher than those of the flat controls. Via comparison of the micropatterns, the pillars caused a stronger response of the osteogenic differentiation of hMSCs with a higher level of expression of osteoblast-associated markers, ALP activity, and extracellular matrix mineralization after the cells had been cultured for 21 days. These findings suggest that specific microtopographic cues can direct hMSCs toward osteogenic differentiation.
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Affiliation(s)
- Angela Carvalho
- i3S-Instituto de Investigação e Inovação em Saúde, Universidade do Porto , Rua Alfredo Allen, 208 4200-135 Porto, Portugal
- INEB-Instituto de Engenharia Biomédica, Universidade do Porto , Rua Alfredo Allen, 208 4200-135 Porto, Portugal
- Faculdade de Engenharia, Departamento de Engenharia Metalúrgica e Materiais, Universidade do Porto , Rua Dr Roberto Frias, s/n, 4200-465 Porto, Portugal
| | - Alejandro Pelaez-Vargas
- Universidad Cooperativa de Colombia , Faculty of Dentistry, Carrera 47 # 37sur-18, Medellín, Colombia
| | - Derek J Hansford
- Department of Biomedical Engineering, The Ohio State University , 1080 Carmack Road, Columbus, Ohio 43210, United States
| | - Maria H Fernandes
- Laboratory for Bone Metabolism and Regeneration, Faculdade de Medicina Dentária, Universidade do Porto , Rua Dr. Manuel Pereira da Silva, 4200-393 Porto, Portugal
| | - Fernando J Monteiro
- i3S-Instituto de Investigação e Inovação em Saúde, Universidade do Porto , Rua Alfredo Allen, 208 4200-135 Porto, Portugal
- INEB-Instituto de Engenharia Biomédica, Universidade do Porto , Rua Alfredo Allen, 208 4200-135 Porto, Portugal
- Faculdade de Engenharia, Departamento de Engenharia Metalúrgica e Materiais, Universidade do Porto , Rua Dr Roberto Frias, s/n, 4200-465 Porto, Portugal
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Barata D, Resmini A, Pereira D, Veldhuis SA, van Blitterswijk CA, ten Elshof JE, Habibovic P. Surface micropatterning with zirconia and calcium phosphate ceramics by micromoulding in capillaries. J Mater Chem B 2016; 4:1044-1055. [DOI: 10.1039/c5tb02027a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Micropatterning of silicon surface with bioinert yttria-stabilised zirconia or bioactive calcium phosphate ceramic by micromoulding in capillaries.
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Affiliation(s)
- D. Barata
- Department of Tissue Regeneration
- MIRA Institute for Biomedical Technology and Technical Medicine
- University of Twente
- 7500 AE Enschede
- The Netherlands
| | - A. Resmini
- MESA+ Institute for Nanotechnology
- Inorganic Materials Science Group
- University of Twente
- 7500 AE Enschede
- The Netherlands
| | - D. Pereira
- Department of Tissue Regeneration
- MIRA Institute for Biomedical Technology and Technical Medicine
- University of Twente
- 7500 AE Enschede
- The Netherlands
| | - S. A. Veldhuis
- MESA+ Institute for Nanotechnology
- Inorganic Materials Science Group
- University of Twente
- 7500 AE Enschede
- The Netherlands
| | - C. A. van Blitterswijk
- Department of Tissue Regeneration
- MIRA Institute for Biomedical Technology and Technical Medicine
- University of Twente
- 7500 AE Enschede
- The Netherlands
| | - J. E. ten Elshof
- MESA+ Institute for Nanotechnology
- Inorganic Materials Science Group
- University of Twente
- 7500 AE Enschede
- The Netherlands
| | - P. Habibovic
- Department of Tissue Regeneration
- MIRA Institute for Biomedical Technology and Technical Medicine
- University of Twente
- 7500 AE Enschede
- The Netherlands
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Zhang W, Yang Y, Zhang K, Li Y, Fang G. Weft-knitted silk-poly(lactide-co-glycolide) mesh scaffold combined with collagen matrix and seeded with mesenchymal stem cells for rabbit Achilles tendon repair. Connect Tissue Res 2015; 56:25-34. [PMID: 25333819 DOI: 10.3109/03008207.2014.976309] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Natural silk fibroin fiber scaffolds have excellent mechanical properties, but degrade slowly. In this study, we used poly(lactide-co-glycolide) (PLGA, 10:90) fibers to adjust the overall degradation rate of the scaffolds and filled them with collagen to reserve space for cell growth. Silk fibroin-PLGA (36:64) mesh scaffolds were prepared using weft-knitting, filled with type I collagen, and incubated with rabbit autologous bone marrow-derived mesenchymal stem cells (MSCs). These scaffold-cells composites were implanted into rabbit Achilles tendon defects. At 16 weeks after implantation, morphological and histological observations showed formation of tendon-like tissues that expressed type I collagen mRNA and a uniformly dense distribution of collagen fibers. The maximum load of the regenerated Achilles tendon was 58.32% of normal Achilles tendon, which was significantly higher than control group without MSCs. These findings suggest that it is feasible to construct tissue engineered tendon using weft-knitted silk fibroin-PLGA fiber mesh/collagen matrix seeded with MSCs for rabbit Achilles tendon defect repair.
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Affiliation(s)
- Wenyuan Zhang
- Institute of Bioengineering, Zhejiang Academy of Medical Sciences , Hangzhou , China
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Park JH, Lee J, Choi IS, Yang SH. Bioinspired Fabrication of Silica Thin Films on Histidine-Terminated Self-Assembled Monolayers. B KOREAN CHEM SOC 2014. [DOI: 10.5012/bkcs.2014.35.11.3336] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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12
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Karfeld-Sulzer LS, Ghayor C, Siegenthaler B, Gjoksi B, Pohjonen TH, Weber FE. Comparative study of NMP-preloaded and dip-loaded membranes for guided bone regeneration of rabbit cranial defects. J Tissue Eng Regen Med 2014; 11:425-433. [PMID: 24919954 DOI: 10.1002/term.1926] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2013] [Revised: 04/23/2014] [Accepted: 05/05/2014] [Indexed: 11/07/2022]
Abstract
Guided bone regeneration (GBR) has been utilized for several decades for the healing of cranio-maxillofacial bone defects and, particularly in the dental field, by creating space with a barrier membrane to exclude soft tissue and encourage bone growth in the membrane-protected volume. Although the first membranes were non-resorbable, a new generation of GBR membranes aims to biodegrade and provide bioactivity for better overall results. The Inion GTR™ poly(lactide-co-glycolide) (PLGA) membrane is not only resorbable but also bioactive, since it includes N-methylpyrrolidone (NMP), which has been shown to promote bone regeneration. In this study, the effects of loading different amounts of NMP onto the membrane through chemical vapour deposition or dipping have been explored. In vitro release demonstrated that lower levels of NMP led to lower NMP concentrations and slower release, based on total NMP loaded in the membrane. The dipped membrane released almost all of the NMP within 15 min, leading to a high NMP concentration. For the in vivo studies in rabbits, 6 mm calvarial defects were created and left untreated or covered with an ePTFE membrane or PLGA membranes dipped in, or preloaded with, NMP. Evaluation of the bony regeneration revealed that the barrier membranes improved bony healing and that a decrease in NMP content improved the performance. Overall, we have demonstrated the potential of these PLGA membranes with a more favourable NMP release profile and the significance of exploring the effect of NMP on these PLGA membranes with regard to bone ingrowth. Copyright © 2014 John Wiley & Sons, Ltd.
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Affiliation(s)
- Lindsay S Karfeld-Sulzer
- Oral Biotechnology and Bioengineering, Department of Cranio-maxillofacial and Oral Surgery, University Hospital Zurich, and Center for Dental Medicine, University of Zurich, Switzerland
| | - Chafik Ghayor
- Oral Biotechnology and Bioengineering, Department of Cranio-maxillofacial and Oral Surgery, University Hospital Zurich, and Center for Dental Medicine, University of Zurich, Switzerland
| | - Barbara Siegenthaler
- Oral Biotechnology and Bioengineering, Department of Cranio-maxillofacial and Oral Surgery, University Hospital Zurich, and Center for Dental Medicine, University of Zurich, Switzerland.,Zurich Centre for Integrative Human Physiology, University of Zurich, Switzerland
| | - Bebeka Gjoksi
- Oral Biotechnology and Bioengineering, Department of Cranio-maxillofacial and Oral Surgery, University Hospital Zurich, and Center for Dental Medicine, University of Zurich, Switzerland
| | | | - Franz E Weber
- Oral Biotechnology and Bioengineering, Department of Cranio-maxillofacial and Oral Surgery, University Hospital Zurich, and Center for Dental Medicine, University of Zurich, Switzerland.,Zurich Centre for Integrative Human Physiology, University of Zurich, Switzerland.,Centre for Applied Biotechnology and Molecular Medicine (CABMM), University of Zurich, Switzerland
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13
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Laranjeira MS, Carvalho Â, Pelaez-Vargas A, Hansford D, Ferraz MP, Coimbra S, Costa E, Santos-Silva A, Fernandes MH, Monteiro FJ. Modulation of human dermal microvascular endothelial cell and human gingival fibroblast behavior by micropatterned silica coating surfaces for zirconia dental implant applications. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2014; 15:025001. [PMID: 27877662 PMCID: PMC5090413 DOI: 10.1088/1468-6996/15/2/025001] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2013] [Revised: 03/07/2014] [Accepted: 02/09/2014] [Indexed: 05/15/2023]
Abstract
Dental ceramic implants have shown superior esthetic behavior and the absence of induced allergic disorders when compared to titanium implants. Zirconia may become a potential candidate to be used as an alternative to titanium dental implants if surface modifications are introduced. In this work, bioactive micropatterned silica coatings were produced on zirconia substrates, using a combined methodology of sol-gel processing and soft lithography. The aim of the work was to compare the in vitro behavior of human gingival fibroblasts (HGFs) and human dermal microvascular endothelial cells (HDMECs) on three types of silica-coated zirconia surfaces: flat and micropatterned (with pillars and with parallel grooves). Our results showed that cells had a higher metabolic activity (HGF, HDMEC) and increased gene expression levels of fibroblast-specific protein-1 (FSP-1) and collagen type I (COL I) on surfaces with pillars. Nevertheless, parallel grooved surfaces were able to guide cell growth. Even capillary tube-like networks of HDMEC were oriented according to the surface geometry. Zirconia and silica with different topographies have shown to be blood compatible and silica coating reduced bacteria adhesion. All together, the results indicated that microstructured bioactive coating seems to be an efficient strategy to improve soft tissue integration on zirconia implants, protecting implants from peri-implant inflammation and improving long-term implant stabilization. This new approach of micropatterned silica coating on zirconia substrates can generate promising novel dental implants, with surfaces that provide physical cues to guide cells and enhance their behavior.
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Affiliation(s)
- Marta S Laranjeira
- INEB—Instituto Engenharia Biomédica, Universidade do Porto, Porto, Portugal
- Faculdade de Engenharia, DEMM, Universidade do Porto, Porto, Portugal
| | - Ângela Carvalho
- INEB—Instituto Engenharia Biomédica, Universidade do Porto, Porto, Portugal
- Faculdade de Engenharia, DEMM, Universidade do Porto, Porto, Portugal
| | | | - Derek Hansford
- Department of Biomedical Engineering (BME), Ohio State University, Columbus, OH, USA
| | - Maria Pia Ferraz
- INEB—Instituto Engenharia Biomédica, Universidade do Porto, Porto, Portugal
- Laboratory CEBIMED—Centro de Estudos em Biomedicina, Universidade Fernando Pessoa, Porto, Portugal
| | - Susana Coimbra
- IBMC—Instituto de Biologia Molecular e Celular, Universidade do Porto, Porto, Portugal
- CESPU—Instituto de Investigação e Formação Avançada em Ciências e Tecnologias da Saúde, Gandra-PRD, Portugal
| | - Elísio Costa
- IBMC—Instituto de Biologia Molecular e Celular, Universidade do Porto, Porto, Portugal
- Departamento de Ciências Biológicas-Serviço de Bioquímica, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
| | - Alice Santos-Silva
- IBMC—Instituto de Biologia Molecular e Celular, Universidade do Porto, Porto, Portugal
- Departamento de Ciências Biológicas-Serviço de Bioquímica, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
| | - Maria Helena Fernandes
- Laboratory for Bone Metabolism and Regeneration, Faculdade de Medicina Dentária, Universidade do Porto, Porto, Portugal
| | - Fernando Jorge Monteiro
- INEB—Instituto Engenharia Biomédica, Universidade do Porto, Porto, Portugal
- Faculdade de Engenharia, DEMM, Universidade do Porto, Porto, Portugal
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