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Guerra AJ, Lara-Padilla H, Becker ML, Rodriguez CA, Dean D. Photopolymerizable Resins for 3D-Printing Solid-Cured Tissue Engineered Implants. Curr Drug Targets 2019; 20:823-838. [DOI: 10.2174/1389450120666190114122815] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Revised: 12/02/2018] [Accepted: 12/05/2018] [Indexed: 12/22/2022]
Abstract
With the advent of inexpensive and highly accurate 3D printing devices, a tremendous flurry
of research activity has been unleashed into new resorbable, polymeric materials that can be printed using
three approaches: hydrogels for bioprinting and bioplotting, sintered polymer powders, and solid cured
(photocrosslinked) resins. Additionally, there is a race to understand the role of extracellular matrix components
and cell signalling molecules and to fashion ways to incorporate these materials into resorbable
implants. These chimeric materials along with microfluidic devices to study organs or create labs on
chips, are all receiving intense attention despite the limited number of polymer systems that can accommodate
the biofabrication processes necessary to render these constructs. Perhaps most telling is the limited
number of photo-crosslinkable, resorbable polymers and fabrication additives (e.g., photoinitiators,
solvents, dyes, dispersants, emulsifiers, or bioactive molecules such as micro-RNAs, peptides, proteins,
exosomes, micelles, or ceramic crystals) available to create resins that have been validated as biocompatible.
Advances are needed to manipulate 4D properties of 3D printed scaffolds such as pre-implantation
cell culture, mechanical properties, resorption kinetics, drug delivery, scaffold surface functionalization,
cell attachment, cell proliferation, cell maturation, or tissue remodelling; all of which are necessary for
regenerative medicine applications along with expanding the small set of materials in clinical use. This
manuscript presents a review of the foundation of the most common photopolymerizable resins for solidcured
scaffolds and medical devices, namely, polyethylene glycol (PEG), poly(D, L-lactide) (PDLLA),
poly-ε-caprolactone (PCL), and poly(propylene fumarate) (PPF), along with methodological advances
for 3D Printing tissue engineered implants (e.g., via stereolithography [SLA], continuous Digital Light
Processing [cDLP], and Liquid Crystal Display [LCD]).
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Affiliation(s)
- Antonio J. Guerra
- Department of Plastic and Reconstructive Surgery, The Ohio State University, Columbus, OH 43210, United States
| | - Hernan Lara-Padilla
- Department of Plastic and Reconstructive Surgery, The Ohio State University, Columbus, OH 43210, United States
| | - Matthew L. Becker
- Department of Polymer Science, University of Akron, Akron, OH, United States
| | - Ciro A. Rodriguez
- Department of Plastic and Reconstructive Surgery, The Ohio State University, Columbus, OH 43210, United States
| | - David Dean
- Department of Plastic and Reconstructive Surgery, The Ohio State University, Columbus, OH 43210, United States
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Dubois L, Steenen S, Gooris P, Bos R, Becking A. Controversies in orbital reconstruction—III. Biomaterials for orbital reconstruction: a review with clinical recommendations. Int J Oral Maxillofac Surg 2016; 45:41-50. [DOI: 10.1016/j.ijom.2015.06.024] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Revised: 06/24/2015] [Accepted: 06/29/2015] [Indexed: 11/25/2022]
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Jiang W, Shi J, Li W, Sun K. Morphology, wettability, and mechanical properties of polycaprolactone/hydroxyapatite composite scaffolds with interconnected pore structures fabricated by a mini-deposition system. POLYM ENG SCI 2012. [DOI: 10.1002/pen.23193] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Biomaterials and implants for orbital floor repair. Acta Biomater 2011; 7:3248-66. [PMID: 21651997 DOI: 10.1016/j.actbio.2011.05.016] [Citation(s) in RCA: 108] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2011] [Revised: 04/19/2011] [Accepted: 05/16/2011] [Indexed: 11/23/2022]
Abstract
Treatment of orbital floor fractures and defects is often a complex issue. Repair of these injuries essentially aims to restore the continuity of the orbital floor and to provide an adequate support to the orbital content. Several materials and implants have been proposed over the years for orbital floor reconstruction, in the hope of achieving the best clinical outcome for the patient. Autografts have been traditionally considered as the "gold standard" choice due to the absence of an adverse immunological response, but they are available in limited amounts and carry the need for extra surgery. In order to overcome the drawbacks related to autografts, researchers' and surgeons' attention has been progressively attracted by alloplastic materials, which can be commercially produced and easily tailored to fit a wide range of specific clinical needs. In this review the advantages and limitations of the various biomaterials proposed and tested for orbital floor repair are critically examined and discussed. Criteria and guidelines for optimal material/implant choice, as well as future research directions, are also presented, in an attempt to understand whether an ideal biomaterial already exists or a truly functional implant will eventually materialise in the next few years.
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Mao K, Wang Y, Xiao S, Liu Z, Zhang Y, Zhang X, Wang Z, Lu N, Shourong Z, Xifeng Z, Geng C, Baowei L. Clinical application of computer-designed polystyrene models in complex severe spinal deformities: a pilot study. EUROPEAN SPINE JOURNAL : OFFICIAL PUBLICATION OF THE EUROPEAN SPINE SOCIETY, THE EUROPEAN SPINAL DEFORMITY SOCIETY, AND THE EUROPEAN SECTION OF THE CERVICAL SPINE RESEARCH SOCIETY 2010; 19:797-802. [PMID: 20213294 DOI: 10.1007/s00586-010-1359-0] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2009] [Revised: 01/28/2010] [Accepted: 02/21/2010] [Indexed: 11/24/2022]
Abstract
Surgical treatment of complex severe spinal deformity, involving a scoliosis Cobb angle of more than 90 degrees and kyphosis or vertebral and rib deformity, is challenging. Preoperative two-dimensional images resulting from plain film radiography, computed tomography (CT) and magnetic resonance imaging provide limited morphometric information. Although the three-dimensional (3D) reconstruction CT with special software can view the stereo and rotate the spinal image on the screen, it cannot show the full-scale spine and cannot directly be used on the operation table. This study was conducted to investigate the application of computer-designed polystyrene models in the treatment of complex severe spinal deformity. The study involved 16 cases of complex severe spinal deformity treated in our hospital between 1 May 2004 and 31 December 2007; the mean +/- SD preoperative scoliosis Cobb angle was 118 degrees +/- 27 degrees. The CT scanning digital imaging and communication in medicine (DICOM) data sets of the affected spinal segments were collected for 3D digital reconstruction and rapid prototyping to prepare computer-designed polystyrene models, which were applied in the treatment of these cases. The computer-designed polystyrene models allowed 3D observation and measurement of the deformities directly, which helped the surgeon to perform morphological assessment and communicate with the patient and colleagues. Furthermore, the models also guided the choice and placement of pedicle screws. Moreover, the models were used to aid in virtual surgery and guide the actual surgical procedure. The mean +/- SD postoperative scoliosis Cobb angle was 42 degrees +/- 32 degrees, and no serious complications such as spinal cord or major vascular injury occurred. The use of computer-designed polystyrene models could provide more accurate morphometric information and facilitate surgical correction of complex severe spinal deformity.
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Affiliation(s)
- Keya Mao
- Department of Orthopaedics, General Hospital of Chinese People's Liberation Army, Beijing, 100853, China
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Multilevel Experimental and Modelling Techniques for Bioartificial Scaffolds and Matrices. SCANNING PROBE MICROSCOPY IN NANOSCIENCE AND NANOTECHNOLOGY 2010. [DOI: 10.1007/978-3-642-03535-7_13] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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The engineering of patient-specific, anatomically shaped, digits. Biomaterials 2009; 30:2735-40. [PMID: 19203788 DOI: 10.1016/j.biomaterials.2009.01.037] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2009] [Accepted: 01/19/2009] [Indexed: 11/20/2022]
Abstract
It is now recognized that geometric structures of scaffolds at several size levels have profound influences on cell adhesion, viability, proliferation and differentiation. This study aims to develop an integrated process to fabricate scaffolds with controllable geometric structures at nano-, micro- and macro-scales. A phase-separation method is used to prepare interconnected poly(L-lactide) (PLLA) nanofibrous (NF) scaffolds. The pore size of the NF scaffold at the scale of several hundred micrometers is controlled by the size of porogen, paraffin spheres. At millimeter scale and above, the overall shape of the scaffold is defined by a wax mold produced using a three-dimensional printer. The printer utilizes a stereo lithographic file generated from computed tomographic files retrieved from the National Library of Medicine's Visual Human Project. NF PLLA scaffolds with a human digit shape are successfully prepared using this process. Osteoblast cell line MC3T3-E1 cells are then seeded and cultured in the prepared scaffolds. Cell proliferation, differentiation and biomineralization are characterized to demonstrate the suitability of the scaffolds for the digit bone tissue engineering application.
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Wong SC, Baji A. Fracture strength and adhesive strength of hydroxyapatite-filled polycaprolactone. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2008; 19:929-36. [PMID: 17665122 DOI: 10.1007/s10856-007-3016-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2006] [Accepted: 03/27/2007] [Indexed: 05/16/2023]
Abstract
Fracture toughness and tear strength of hydroxyapatite (HAP)-filled poly(epsilon-caprolactone) (PCL) with increasing HAP concentration were studied. The toughness was assessed in terms of essential work of fracture (EWF). Adhesive strength between HAP and PCL interfaces was evaluated using T-peel testing. The adhesion between the two components was found to be relatively strong. Double edge notched tension (DENT) and trousers test specimens were used for the EWF tests. The effect of HAP phase in PCL on the fracture and tearing toughness was investigated. The results obtained from the EWF tests for the HAP-filled PCL complied with the validity criteria of the EWF concept, namely, (1) geometric similarity for all ligament lengths; (2) fully yielded ligament and (3) plane-stress fracture condition. Values for specific essential work of fracture (w ( e )) and specific plastic work of fracture (betaw ( p )) were found to decrease with increase in HAP concentration. The testing procedure showed promise in quantifying the tearing resistance and rising R-curve behavior common in natural materials and it can be extended to other biomaterials that exhibit post-yield deformation. A quantitative assessment based on fracture mechanics of the adhesive strength between the bioactive interfaces plays an important role for continued development of tissue replacement and tissue regeneration materials.
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Affiliation(s)
- Shing-Chung Wong
- Department of Mechanical Engineering, The University of Akron, Akron, OH 44325-3903, USA.
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Sarkar S, Schmitz-Rixen T, Hamilton G, Seifalian AM. Achieving the ideal properties for vascular bypass grafts using a tissue engineered approach: a review. Med Biol Eng Comput 2007; 45:327-36. [PMID: 17340153 DOI: 10.1007/s11517-007-0176-z] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2006] [Accepted: 01/25/2007] [Indexed: 10/23/2022]
Abstract
The multiple demands placed on small calibre cardiovascular bypass grafts have meant that a synthetic prosthesis with good long-term patency has not been developed. A tissue-engineered graft could fulfil the ideal characteristics present in an artery. However, the great disadvantage of such a conduit is the time necessary for maturation leading to unacceptable delays once the decision to intervene surgically has been made. This maturation process is essential to produce a graft which can withstand haemodynamic stress. Once implanted, the tissue-engineered graft can contract in response to immediate haemodynamic conditions and remodel in the long term. We review the latest tissue engineering approaches used to give the favourable properties of mechanical strength, arterial compliance, low thrombogenicity, long-term resistance towards biodegradation as well as technological advances which shorten the time required for production of an implantable graft.
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Affiliation(s)
- Sandip Sarkar
- Biomaterials & Tissue Engineering Centre (BTEC), Academic Division of Surgical and Interventional Sciences, University College London, Rowland Hill Street, London, NW3 2PF, UK
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