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Yassine RA, Hamade RF. Transversely isotropic and isotropic material considerations in determining the mechanical response of geometrically accurate bovine tibia bone. Med Biol Eng Comput 2019; 57:2159-2178. [DOI: 10.1007/s11517-019-02019-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Accepted: 07/19/2019] [Indexed: 11/24/2022]
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Hassan MN, Yassin MA, Suliman S, Lie SA, Gjengedal H, Mustafa K. The bone regeneration capacity of 3D-printed templates in calvarial defect models: A systematic review and meta-analysis. Acta Biomater 2019; 91:1-23. [PMID: 30980937 DOI: 10.1016/j.actbio.2019.04.017] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2019] [Revised: 04/03/2019] [Accepted: 04/04/2019] [Indexed: 12/23/2022]
Abstract
3D-printed templates are being used for bone tissue regeneration (BTR) as temporary guides. In the current review, we analyze the factors considered in producing potentially bioresorbable/degradable 3D-printed templates and their influence on BTR in calvarial bone defect (CBD) animal models. In addition, a meta-analysis was done to compare the achieved BTR for each type of template material (polymer, ceramic or composites). Database collection was completed by January 2018, and the inclusion criteria were all titles and keywords combining 3D printing and BTR in CBD models. Clinical trials and poorly-documented in vivo studies were excluded from this study. A total of 45 relevant studies were finally included and reviewed, and an additional check list was followed before inclusion in the meta-analysis, where material type, porosity %, and the regenerated bone area were collected and analyzed statistically. Overall, the capacity of the printed templates to support BTR was found to depend in large part on the amount of available space (porosity %) provided by the printed templates. Printed ceramic and composite templates showed the best BTR capacity, and the optimum printed template structure was found to have total porosity >50% with a pore diameter between 300 and 400 µm. Additional features and engineered macro-channels within the printed templates increased BTR capacity at long time points (12 weeks). Although the size of bone defects in rabbits was larger than in rats, BTR was greater in rabbits (almost double) at all time points and for all materials used. STATEMENT OF SIGNIFICANCE: In the present study, we reviewed the factors considered in producing degradable 3D-printed templates and their influence on bone tissue regeneration (BTR) in calvarial bone defects through the last 15 years. A meta-analysis was applied on the collected data to quantify and analyze BTR related to each type of template material. The concluded data states the importance of 3D-printed templates for BTR and indicates the ideal design required for an effective clinical translation. The evidence-based guidelines for the best BTR capacity endorse the use of printed composite and ceramic templates with total porosity >50%, pore diameter between 300 and 400 µm, and added engineered macro-channels within the printed templates.
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Applications of 3D printing on craniofacial bone repair: A systematic review. J Dent 2019; 80:1-14. [DOI: 10.1016/j.jdent.2018.11.004] [Citation(s) in RCA: 65] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2018] [Revised: 09/09/2018] [Accepted: 11/07/2018] [Indexed: 12/14/2022] Open
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Chartrain NA, Williams CB, Whittington AR. A review on fabricating tissue scaffolds using vat photopolymerization. Acta Biomater 2018; 74:90-111. [PMID: 29753139 DOI: 10.1016/j.actbio.2018.05.010] [Citation(s) in RCA: 92] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2017] [Revised: 04/23/2018] [Accepted: 05/08/2018] [Indexed: 12/11/2022]
Abstract
Vat Photopolymerization (stereolithography, SLA), an Additive Manufacturing (AM) or 3D printing technology, holds particular promise for the fabrication of tissue scaffolds for use in regenerative medicine. Unlike traditional tissue scaffold fabrication techniques, SLA is capable of fabricating designed scaffolds through the selective photopolymerization of a photopolymer resin on the micron scale. SLA offers unprecedented control over scaffold porosity and permeability, as well as pore size, shape, and interconnectivity. Perhaps even more significantly, SLA can be used to fabricate vascular networks that may encourage angio and vasculogenesis. Fulfilling this potential requires the development of new photopolymers, the incorporation of biochemical factors into printed scaffolds, and an understanding of the effects scaffold geometry have on cell viability, proliferation, and differentiation. This review compares SLA to other scaffold fabrication techniques, highlights significant advances in the field, and offers a perspective on the field's challenges and future directions. STATEMENT OF SIGNIFICANCE Engineering de novo tissues continues to be challenging due, in part, to our inability to fabricate complex tissue scaffolds that can support cell proliferation and encourage the formation of developed tissue. The goal of this review is to first introduce the reader to traditional and Additive Manufacturing scaffold fabrication techniques. The bulk of this review will then focus on apprising the reader of current research and provide a perspective on the promising use of vat photopolymerization (stereolithography, SLA) for the fabrication of complex tissue scaffolds.
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Affiliation(s)
- Nicholas A Chartrain
- Department of Materials Science and Engineering, Virginia Tech, Blacksburg, VA 24061, USA; Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA 24061, USA; Macromolecules Innovation Institute, Virginia Tech, Blacksburg, VA 24061, USA
| | - Christopher B Williams
- Department of Materials Science and Engineering, Virginia Tech, Blacksburg, VA 24061, USA; Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA 24061, USA; Macromolecules Innovation Institute, Virginia Tech, Blacksburg, VA 24061, USA
| | - Abby R Whittington
- Department of Materials Science and Engineering, Virginia Tech, Blacksburg, VA 24061, USA; Macromolecules Innovation Institute, Virginia Tech, Blacksburg, VA 24061, USA; Department of Chemical Engineering, Virginia Tech, Blacksburg, VA 24061, USA.
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Chinnasami H, Gimble J, Devireddy RV. Structure–property relation of porous poly (l-lactic acid) scaffolds fabricated using organic solvent mixtures and controlled cooling rates and its bio-compatibility with human adipose stem cells. J BIOACT COMPAT POL 2018. [DOI: 10.1177/0883911518758354] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Thermally induced phase separation method was used to make porous three-dimensional poly (l-lactic acid) scaffolds. The effect of imposed thermal profile during freezing of the poly (l-lactic acid) in dioxane solution on the scaffold was characterized by their micro-structure, porosity (%), pore sizes’ distribution, and mechanical strength. The porosity (%) decreased considerably with increasing concentrations of poly (l-lactic acid) in the solution, while a decreasing trend was observed with increasing cooling rates. The mechanical strength increases with increase in poly (l-lactic acid) concentration and also with increase in the cooling rate for both types of solvents. Therefore, mechanical strength was increased by higher cooling rates while the porosity (%) remained relatively consistent. Scaffolds made using higher concentrations of poly (l-lactic acid; 7% and 10% w/v) in solvent showed better mechanical strength which improved relatively with increasing cooling rates (1°C–40°C/min). This phenomenon of enhanced structural integrity with increasing cooling rates was more prominent in scaffolds made from higher initial poly (l-lactic acid) concentrations. Human adipose–derived stem cells were cultured on these scaffold (7% and 10% w/v) prepared by thermally induced phase separation at all cooling rates to measure the cell proliferation efficiency as a function of their micro-structural properties. Mean pore sizes played a crucial role in cell proliferation than percent porosity since all scaffolds were >88% porous. The viability percent of human adipose tissue–derived adult stem cells increased consistently with longer periods of culture. Thus, poly (l-lactic acid) scaffolds prepared by thermally controlled thermally induced phase separation method could be a prime candidate for making ex vivo tissue-engineered grafts for surgical implantation.
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Affiliation(s)
- Harish Chinnasami
- Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA, USA
| | - Jeff Gimble
- LaCell, LLC and Tulane Center for Stem Cell Research & Regenerative Medicine and Departments of Medicine, Structural & Cellular Biology and Surgery, Tulane University School of Medicine, New Orleans, LA, USA
| | - Ram V Devireddy
- Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA, USA
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Bhattacharya I, Ghayor C, Weber FE. The Use of Adipose Tissue-Derived Progenitors in Bone Tissue Engineering - a Review. Transfus Med Hemother 2016; 43:336-343. [PMID: 27781021 DOI: 10.1159/000447494] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Accepted: 06/08/2016] [Indexed: 12/12/2022] Open
Abstract
2500 years ago, Hippocrates realized that bone can heal without scaring. The natural healing potential of bone is, however, restricted to small defects. Extended bone defects caused by trauma or during tumor resections still pose a huge problem in orthopedics and cranio-maxillofacial surgery. Bone tissue engineering strategies using stem cells, growth factors, and scaffolds could overcome the problems with the treatment of extended bone defects. In this review, we give a short overview on bone tissue engineering with emphasis on the use of adipose tissue-derived stem cells and small molecules.
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Affiliation(s)
- Indranil Bhattacharya
- Oral Biotechnology & Bioengineering, Cranio-Maxillofacial and Oral Surgery, Center for Dental Medicine, University of Zurich, Zurich, Switzerland
| | - Chafik Ghayor
- Oral Biotechnology & Bioengineering, Cranio-Maxillofacial and Oral Surgery, Center for Dental Medicine, University of Zurich, Zurich, Switzerland
| | - Franz E Weber
- Oral Biotechnology & Bioengineering, Cranio-Maxillofacial and Oral Surgery, Center for Dental Medicine, University of Zurich, Zurich, Switzerland
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Liu J, Hwang HH, Wang P, Whang G, Chen S. Direct 3D-printing of cell-laden constructs in microfluidic architectures. LAB ON A CHIP 2016; 16:1430-1438. [PMID: 26980159 DOI: 10.1039/c6lc00144k] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Microfluidic platforms have greatly benefited the biological and medical fields, however standard practices require a high cost of entry in terms of time and energy. The utilization of three-dimensional (3D) printing technologies has greatly enhanced the ability to iterate and build functional devices with unique functions. However, their inability to fabricate within microfluidic devices greatly increases the cost of producing several different devices to examine different scientific questions. In this work, a variable height micromixer (VHM) is fabricated using projection 3D-printing combined with soft lithography. Theoretical and flow experiments demonstrate that altering the local z-heights of VHM improved mixing at lower flow rates than simple geometries. Mixing of two fluids occurs as low as 320 μL min(-1) in VHM whereas the planar zigzag region requires a flow rate of 2.4 mL min(-1) before full mixing occurred. Following device printing, to further demonstrate the ability of this projection-based method, complex, user-defined cell-laden scaffolds are directly printed inside the VHM. The utilization of this unique ability to produce 3D tissue models within a microfluidic system could offer a unique platform for medical diagnostics and disease modeling.
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Affiliation(s)
- Justin Liu
- Materials Science and Engineering Program, University of California, San Diego, CA 92093, USA.
| | - Henry H Hwang
- Department of NanoEngineering, University of California, San Diego, CA 92093, USA
| | - Pengrui Wang
- Materials Science and Engineering Program, University of California, San Diego, CA 92093, USA.
| | - Grace Whang
- Department of NanoEngineering, University of California, San Diego, CA 92093, USA
| | - Shaochen Chen
- Materials Science and Engineering Program, University of California, San Diego, CA 92093, USA. and Department of NanoEngineering, University of California, San Diego, CA 92093, USA
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Park JY, Gao G, Jang J, Cho DW. 3D printed structures for delivery of biomolecules and cells: tissue repair and regeneration. J Mater Chem B 2016; 4:7521-7539. [DOI: 10.1039/c6tb01662f] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
This paper reviews the current approaches to using 3D printed structures to deliver bioactive factors (e.g., cells and biomolecules) for tissue repair and regeneration.
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Affiliation(s)
- Ju Young Park
- Division of Integrative Biosciences and Biotechnology
- Pohang University of Science and Technology (POSTECH)
- Pohang
- Republic of Korea
| | - Ge Gao
- Department of Mechanical Engineering
- Pohang University of Science and Technology (POSTECH)
- Pohang
- Republic of Korea
| | - Jinah Jang
- Department of Mechanical Engineering
- Pohang University of Science and Technology (POSTECH)
- Pohang
- Republic of Korea
| | - Dong-Woo Cho
- Department of Mechanical Engineering
- Pohang University of Science and Technology (POSTECH)
- Pohang
- Republic of Korea
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Gładysz D, Hozyasz KK. Stem cell regenerative therapy in alveolar cleft reconstruction. Arch Oral Biol 2015; 60:1517-32. [PMID: 26263541 DOI: 10.1016/j.archoralbio.2015.07.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Revised: 05/23/2015] [Accepted: 07/04/2015] [Indexed: 12/17/2022]
Abstract
Achieving a successful and well-functioning reconstruction of craniofacial deformities still remains a challenge. As for now, autologous bone grafting remains the gold standard for alveolar cleft reconstruction. However, its aesthetic and functional results often remain unsatisfactory, which carries a long-term psychosocial and medical sequelae. Therefore, searching for novel therapeutic approaches is strongly indicated. With the recent advances in stem cell research, cell-based tissue engineering strategies move from the bench to the patients' bedside. Successful stem cell engineering employs a carefully selected stem cell source, a biodegradable scaffold with osteoconductive and osteoinductive properties, as well as an addition of growth factors or cytokines to enhance osteogenesis. This review highlights recent advances in mesenchymal stem cell tissue engineering, discusses animal models and case reports of stem cell enhanced bone regeneration, as well as ongoing clinical trials.
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Affiliation(s)
- Dominika Gładysz
- Department of Pediatrics, Institute of Mother and Child, Warsaw, Poland
| | - Kamil K Hozyasz
- Department of Pediatrics, Institute of Mother and Child, Warsaw, Poland.
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Ryan CNM, Fuller KP, Larrañaga A, Biggs M, Bayon Y, Sarasua JR, Pandit A, Zeugolis DI. An academic, clinical and industrial update on electrospun, additive manufactured and imprinted medical devices. Expert Rev Med Devices 2015; 12:601-12. [DOI: 10.1586/17434440.2015.1062364] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Abstract
Bone defects requiring grafts to promote healing are frequently occurring and costly problems in health care. Chitosan, a biodegradable, naturally occurring polymer, has drawn considerable attention in recent years as scaffolding material in tissue engineering and regenerative medicine. Chitosan is especially attractive as a bone scaffold material because it supports the attachment and proliferation of osteoblast cells as well as formation of mineralized bone matrix. In this review, we discuss the fundamentals of bone tissue engineering and the unique properties of chitosan as a scaffolding material to treat bone defects for hard tissue regeneration. We present the common methods for fabrication and characterization of chitosan scaffolds, and discuss the influence of material preparation and addition of polymeric or ceramic components or biomolecules on chitosan scaffold properties such as mechanical strength, structural integrity, and functional bone regeneration. Finally, we highlight recent advances in development of chitosan-based scaffolds with enhanced bone regeneration capability.
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Affiliation(s)
- Sheeny Lan Levengood
- Department of Materials Science & Engineering, University of Washington, Seattle, WA 98195 USA
| | - Miqin Zhang
- Department of Materials Science & Engineering, University of Washington, Seattle, WA 98195 USA
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