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Wang M, Jiang G, Yang H, Jin X. Computational models of bone fracture healing and applications: a review. BIOMED ENG-BIOMED TE 2024; 69:219-239. [PMID: 38235582 DOI: 10.1515/bmt-2023-0088] [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: 03/02/2023] [Accepted: 12/12/2023] [Indexed: 01/19/2024]
Abstract
Fracture healing is a very complex physiological process involving multiple events at different temporal and spatial scales, such as cell migration and tissue differentiation, in which mechanical stimuli and biochemical factors assume key roles. With the continuous improvement of computer technology in recent years, computer models have provided excellent solutions for studying the complex process of bone healing. These models not only provide profound insights into the mechanisms of fracture healing, but also have important implications for clinical treatment strategies. In this review, we first provide an overview of research in the field of computational models of fracture healing based on CiteSpace software, followed by a summary of recent advances, and a discussion of the limitations of these models and future directions for improvement. Finally, we provide a systematic summary of the application of computational models of fracture healing in three areas: bone tissue engineering, fixator optimization and clinical treatment strategies. The application of computational models of bone healing in clinical treatment is immature, but an inevitable trend, and as these models become more refined, their role in guiding clinical treatment will become more prominent.
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Affiliation(s)
- Monan Wang
- School of Mechanical and Power Engineering, Harbin University of Science and Technology, Harbin, Heilongjiang, China
| | - Guodong Jiang
- School of Mechanical and Power Engineering, Harbin University of Science and Technology, Harbin, Heilongjiang, China
| | - Haoyu Yang
- School of Mechanical and Power Engineering, Harbin University of Science and Technology, Harbin, Heilongjiang, China
| | - Xin Jin
- School of Mechanical and Power Engineering, Harbin University of Science and Technology, Harbin, Heilongjiang, China
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2
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Drakoulas G, Gortsas T, Polyzos E, Tsinopoulos S, Pyl L, Polyzos D. An explainable machine learning-based probabilistic framework for the design of scaffolds in bone tissue engineering. Biomech Model Mechanobiol 2024; 23:987-1012. [PMID: 38416219 DOI: 10.1007/s10237-024-01817-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Accepted: 01/01/2024] [Indexed: 02/29/2024]
Abstract
Recently, 3D-printed biodegradable scaffolds have shown great potential for bone repair in critical-size fractures. The differentiation of the cells on a scaffold is impacted among other factors by the surface deformation of the scaffold due to mechanical loading and the wall shear stresses imposed by the interstitial fluid flow. These factors are in turn significantly affected by the material properties, the geometry of the scaffold, as well as the loading and flow conditions. In this work, a numerical framework is proposed to study the influence of these factors on the expected osteochondral cell differentiation. The considered scaffold is rectangular with a 0/90 lay-down pattern and a four-layered strut made of polylactic acid with a 5% steel particle content. The distribution of the different types of cells on the scaffold surface is estimated through a scalar stimulus, calculated by using a mechanobioregulatory model. To reduce the simulation time for the computation of the stimulus, a probabilistic machine learning (ML)-based reduced-order model (ROM) is proposed. Then, a sensitivity analysis is performed using the Shapley additive explanations to examine the contribution of the various parameters to the framework stimulus predictions. In a final step, a multiobjective optimization procedure is implemented using genetic algorithms and the ROM, aiming to identify the material parameters and loading conditions that maximize the percentage of surface area populated by bone cells while minimizing the area corresponding to the other types of cells and the resorption condition. The results of the performed analysis highlight the potential of using ROMs for the scaffold design, by dramatically reducing the simulation time while enabling the efficient implementation of sensitivity analysis and optimization procedures.
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Affiliation(s)
- George Drakoulas
- Department of Mechanical Engineering and Aeronautics, University of Patras, 26504, Rio, Greece.
| | - Theodore Gortsas
- Department of Mechanical Engineering and Aeronautics, University of Patras, 26504, Rio, Greece.
- Department of Mechanical Engineering, University of Peloponnese, 26334, Patras, Greece.
| | - Efstratios Polyzos
- Department of Mechanics of Materials and Constructions, Vrije Universiteit Brussel (VUB), 1050, Brussels, Belgium
| | - Stephanos Tsinopoulos
- Department of Mechanical Engineering, University of Peloponnese, 26334, Patras, Greece
| | - Lincy Pyl
- Department of Mechanics of Materials and Constructions, Vrije Universiteit Brussel (VUB), 1050, Brussels, Belgium
| | - Demosthenes Polyzos
- Department of Mechanical Engineering and Aeronautics, University of Patras, 26504, Rio, Greece
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3
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Lu T, Sun Z, Xia H, Qing J, Rashad A, Lu Y, He X. Comparing the osteogenesis outcomes of different lumbar interbody fusions (A/O/X/T/PLIF) by evaluating their mechano-driven fusion processes. Comput Biol Med 2024; 171:108215. [PMID: 38422963 DOI: 10.1016/j.compbiomed.2024.108215] [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: 12/20/2023] [Revised: 02/20/2024] [Accepted: 02/25/2024] [Indexed: 03/02/2024]
Abstract
BACKGROUND In lumbar interbody fusion (LIF), achieving proper fusion status requires osteogenesis to occur in the disc space. Current LIF techniques, including anterior, oblique, lateral, transforaminal, and posterior LIF (A/O/X/T/PLIF), may result in varying osteogenesis outcomes due to differences in biomechanical characteristics. METHODS A mechano-regulation algorithm was developed to predict the fusion processes of A/O/X/T/PLIF based on finite element modeling and iterative evaluations of the mechanobiological activities of mesenchymal stem cells (MSCs) and their differentiated cells (osteoblasts, chondrocytes, and fibroblasts). Fusion occurred in the grafting region, and each differentiated cell type generated the corresponding tissue proportional to its concentration. The corresponding osteogenesis volume was calculated by multiplying the osteoblast concentration by the grafting volume. RESULTS TLIF and ALIF achieved markedly greater osteogenesis volumes than did PLIF and O/XLIF (5.46, 5.12, 4.26, and 3.15 cm3, respectively). Grafting volume and cage size were the main factors influencing the osteogenesis outcome in patients treated with LIF. A large grafting volume allowed more osteoblasts (bone tissues) to be accommodated in the disc space. A small cage size reduced the cage/endplate ratio and therefore decreased the stiffness of the LIF. This led to a larger osteogenesis region to promote osteoblastic differentiation of MSCs and osteoblast proliferation (bone regeneration), which subsequently increased the bone fraction in the grafting space. CONCLUSION TLIF and ALIF produced more favorable biomechanical environments for osteogenesis than did PLIF and O/XLIF. A small cage and a large grafting volume improve osteogenesis by facilitating osteogenesis-related cell activities driven by mechanical forces.
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Affiliation(s)
- Teng Lu
- Department of Orthopaedics, Xi'an Jiaotong University Second Affiliated Hospital, Xi'an, Shaanxi Province, China
| | - Zhongwei Sun
- Department of Engineering Mechanics, School of Civil Engineering, Southeast University, Nanjing, Jiangsu Province, China
| | - Huanhuan Xia
- China Science and Technology Exchange Center, Beijing, China
| | - Jie Qing
- Department of Orthopaedics, Xi'an Jiaotong University Second Affiliated Hospital, Xi'an, Shaanxi Province, China
| | - Abdul Rashad
- Department of Orthopaedics, Xi'an Jiaotong University Second Affiliated Hospital, Xi'an, Shaanxi Province, China
| | - Yi Lu
- Department of Neurosurgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA.
| | - Xijing He
- Department of Orthopaedics, Xi'an Jiaotong University Second Affiliated Hospital, Xi'an, Shaanxi Province, China.
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Manescu (Paltanea) V, Paltanea G, Antoniac A, Gruionu LG, Robu A, Vasilescu M, Laptoiu SA, Bita AI, Popa GM, Cocosila AL, Silviu V, Porumb A. Mechanical and Computational Fluid Dynamic Models for Magnesium-Based Implants. MATERIALS (BASEL, SWITZERLAND) 2024; 17:830. [PMID: 38399081 PMCID: PMC10890492 DOI: 10.3390/ma17040830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2023] [Revised: 01/26/2024] [Accepted: 02/03/2024] [Indexed: 02/25/2024]
Abstract
Today, mechanical properties and fluid flow dynamic analysis are considered to be two of the most important steps in implant design for bone tissue engineering. The mechanical behavior is characterized by Young's modulus, which must have a value close to that of the human bone, while from the fluid dynamics point of view, the implant permeability and wall shear stress are two parameters directly linked to cell growth, adhesion, and proliferation. In this study, we proposed two simple geometries with a three-dimensional pore network dedicated to a manufacturing route based on a titanium wire waving procedure used as an intermediary step for Mg-based implant fabrication. Implant deformation under different static loads, von Mises stresses, and safety factors were investigated using finite element analysis. The implant permeability was computed based on Darcy's law following computational fluid dynamic simulations and, based on the pressure drop, was numerically estimated. It was concluded that both models exhibited a permeability close to the human trabecular bone and reduced wall shear stresses within the biological range. As a general finding, the proposed geometries could be useful in orthopedics for bone defect treatment based on numerical analyses because they mimic the trabecular bone properties.
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Affiliation(s)
- Veronica Manescu (Paltanea)
- Faculty of Material Science and Engineering, National University of Science and Technology Politehnica Bucharest, 313 Splaiul Independentei, District 6, RO-060042 Bucharest, Romania; (V.M.); (A.R.); (M.V.); (S.A.L.)
- Faculty of Electrical Engineering, National University of Science and Technology Politehnica Bucharest, 313 Splaiul Independentei, District 6, RO-060042 Bucharest, Romania;
| | - Gheorghe Paltanea
- Faculty of Electrical Engineering, National University of Science and Technology Politehnica Bucharest, 313 Splaiul Independentei, District 6, RO-060042 Bucharest, Romania;
| | - Aurora Antoniac
- Faculty of Material Science and Engineering, National University of Science and Technology Politehnica Bucharest, 313 Splaiul Independentei, District 6, RO-060042 Bucharest, Romania; (V.M.); (A.R.); (M.V.); (S.A.L.)
| | - Lucian Gheorghe Gruionu
- Faculty of Mechanics, University of Craiova, 13 Alexandru Ioan Cuza, RO-200585 Craiova, Romania;
| | - Alina Robu
- Faculty of Material Science and Engineering, National University of Science and Technology Politehnica Bucharest, 313 Splaiul Independentei, District 6, RO-060042 Bucharest, Romania; (V.M.); (A.R.); (M.V.); (S.A.L.)
| | - Marius Vasilescu
- Faculty of Material Science and Engineering, National University of Science and Technology Politehnica Bucharest, 313 Splaiul Independentei, District 6, RO-060042 Bucharest, Romania; (V.M.); (A.R.); (M.V.); (S.A.L.)
| | - Stefan Alexandru Laptoiu
- Faculty of Material Science and Engineering, National University of Science and Technology Politehnica Bucharest, 313 Splaiul Independentei, District 6, RO-060042 Bucharest, Romania; (V.M.); (A.R.); (M.V.); (S.A.L.)
| | - Ana Iulia Bita
- Faculty of Material Science and Engineering, National University of Science and Technology Politehnica Bucharest, 313 Splaiul Independentei, District 6, RO-060042 Bucharest, Romania; (V.M.); (A.R.); (M.V.); (S.A.L.)
| | - Georgiana Maria Popa
- Department of Surgical Disciplines, Faculty of Medicine and Pharmacy, University of Oradea, 10 P-ta 1 December Street, RO-410073 Oradea, Romania; (G.M.P.); (A.L.C.); (V.S.)
| | - Andreea Liliana Cocosila
- Department of Surgical Disciplines, Faculty of Medicine and Pharmacy, University of Oradea, 10 P-ta 1 December Street, RO-410073 Oradea, Romania; (G.M.P.); (A.L.C.); (V.S.)
| | - Vlad Silviu
- Department of Surgical Disciplines, Faculty of Medicine and Pharmacy, University of Oradea, 10 P-ta 1 December Street, RO-410073 Oradea, Romania; (G.M.P.); (A.L.C.); (V.S.)
| | - Anca Porumb
- Department of Dental Medicine, Faculty of Medicine and Pharmacy, University of Oradea, 10 P-ta 1 December Street, RO-410073 Oradea, Romania;
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Wang Z, Liao B, Liu Y, Liao Y, Zhou Y, Li W. Influence of structural parameters of 3D-printed triply periodic minimal surface gyroid porous scaffolds on compression performance, cell response, and bone regeneration. J Biomed Mater Res B Appl Biomater 2024; 112:e35337. [PMID: 37795764 DOI: 10.1002/jbm.b.35337] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Revised: 08/19/2023] [Accepted: 09/18/2023] [Indexed: 10/06/2023]
Abstract
In this study, multi-scale triply periodic minimal surface (TPMS) porous scaffolds with uniform and radial gradient distribution on pore size were printed based on the selective laser melting technology, and the influences of porosity, pore size and radial pore size distribution on compression mechanical properties, cell behavior, and bone regeneration behavior were analyzed. The results showed that the compression performance of the uniform porous scaffolds with high porosity was similar to that of cancellous bone of pig tibia, and the gradient porous scaffolds have higher elastic modulus and compressive toughness. After 4 days of cell culture, cells were distributed on the surface of scaffolds mostly, and the number of adherent cells was higher on the small pore size porous scaffolds; After 7 days, the area and density of cell proliferation on the scaffolds were improved; After 14 days, the cells on the small pore size scaffolds tended to migrate to adjacent pores. Animal implantation experiments showed that collagen fiber osteoid was intermittent on scaffolds with high porosity and large pore size, which was not conducive to bone formation. The appropriate pore size and porosity of bone regeneration were 792 um and 83%, respectively, and the regenerative ability of gradient pore size was better than that of uniform pore size. Our study explains the rules of TPMS gyroid structure parameters on compression performance, cell response and bone regeneration, and provides a reference value for the design of bone repair scaffolds for clinical orthopedics.
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Affiliation(s)
- Zhenglun Wang
- Tribology Research Institute, Key Laboratory for Advanced Technology of Materials of Ministry of Education, Southwest Jiaotong University, Chengdu, China
| | - Bo Liao
- Tribology Research Institute, Key Laboratory for Advanced Technology of Materials of Ministry of Education, Southwest Jiaotong University, Chengdu, China
| | - Yongsheng Liu
- State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Pangang Group Research Institute Co., Ltd., Panzhihua, China
- R & D Center for High-end Parts, Chengdu Advanced Metal Materials Industry Technology Research Institute Co., Ltd., Chengdu, China
| | - Yunqian Liao
- Tribology Research Institute, Key Laboratory for Advanced Technology of Materials of Ministry of Education, Southwest Jiaotong University, Chengdu, China
| | - Yu Zhou
- Tribology Research Institute, Key Laboratory for Advanced Technology of Materials of Ministry of Education, Southwest Jiaotong University, Chengdu, China
| | - Wei Li
- Tribology Research Institute, Key Laboratory for Advanced Technology of Materials of Ministry of Education, Southwest Jiaotong University, Chengdu, China
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Rodríguez-Montaño ÓL, Vaiani L, Boccaccio A, Uva AE, Lo Muzio L, Spirito F, Dioguardi M, Santacroce L, Di Cosola M, Cantore S, Ballini A. Optimization of Cobalt-Chromium (Co-Cr) Scaffolds for Bone Tissue Engineering in Endocrine, Metabolic and Immune Disorders. Endocr Metab Immune Disord Drug Targets 2024; 24:430-440. [PMID: 37946349 DOI: 10.2174/0118715303258126231025115956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/15/2023] [Revised: 08/01/2023] [Accepted: 09/21/2023] [Indexed: 11/12/2023]
Abstract
Approximately 50% of the adult global population is projected to suffer from some form of metabolic disease by 2050, including metabolic syndrome and diabetes mellitus. At the same time, this trend indicates a potential increase in the number of patients who will be in need of implant-supported reconstructions of specific bone regions subjected to inflammatory states. Moreover, physiological conditions associated with dysmetabolic subjects have been suggested to contribute to the severity of bone loss after bone implant insertion. However, there is a perspective evidence strengthening the hypothesis that custom-fabricated bioengineered scaffolds may produce favorable bone healing effects in case of altered endocrine or metabolic conditions. This perspective review aims to share a comprehensive knowledge of the mechanisms implicated in bone resorption and remodelling processes, which have driven researchers to develop metallic implants as the cobalt-chromium (Co-Cr) bioscaffolds, presenting optimized geometries that interact in an effective way with the osteogenetic precursor cells, especially in the cases of perturbed endocrine or metabolic conditions.
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Affiliation(s)
| | - Lorenzo Vaiani
- Department of Mechanics, Mathematics and Management, Polytechnic University of Bari, Bari, Italy
| | - Antonio Boccaccio
- Department of Mechanics, Mathematics and Management, Polytechnic University of Bari, Bari, Italy
| | - Antonio Emmanuele Uva
- Department of Mechanics, Mathematics and Management, Polytechnic University of Bari, Bari, Italy
| | - Lorenzo Lo Muzio
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy
| | - Francesca Spirito
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy
| | - Mario Dioguardi
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy
| | - Luigi Santacroce
- Department of Interdisciplinary Medicine, Microbiology and Virology Unit, University of Bari Aldo Moro, Bari, Apulia, Italy
| | - Michele Di Cosola
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy
| | - Stefania Cantore
- Department of Mechanics, Mathematics and Management, Polytechnic University of Bari, Bari, Italy
- Independent Researcher, Sorriso & Benessere - Ricerca e Clinica, Bari, Italy
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Naples, Italy
| | - Andrea Ballini
- Department of Mechanics, Mathematics and Management, Polytechnic University of Bari, Bari, Italy
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Naples, Italy
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7
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Pei B, Hu M, Wu X, Lu D, Zhang S, Zhang L, Wu S. Investigations into the effects of scaffold microstructure on slow-release system with bioactive factors for bone repair. Front Bioeng Biotechnol 2023; 11:1230682. [PMID: 37781533 PMCID: PMC10537235 DOI: 10.3389/fbioe.2023.1230682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Accepted: 09/01/2023] [Indexed: 10/03/2023] Open
Abstract
In recent years, bone tissue engineering (BTE) has played an essential role in the repair of bone tissue defects. Although bioactive factors as one component of BTE have great potential to effectively promote cell differentiation and bone regeneration, they are usually not used alone due to their short effective half-lives, high concentrations, etc. The release rate of bioactive factors could be controlled by loading them into scaffolds, and the scaffold microstructure has been shown to significantly influence release rates of bioactive factors. Therefore, this review attempted to investigate how the scaffold microstructure affected the release rate of bioactive factors, in which the variables included pore size, pore shape and porosity. The loading nature and the releasing mechanism of bioactive factors were also summarized. The main conclusions were achieved as follows: i) The pore shapes in the scaffold may have had no apparent effect on the release of bioactive factors but significantly affected mechanical properties of the scaffolds; ii) The pore size of about 400 μm in the scaffold may be more conducive to controlling the release of bioactive factors to promote bone formation; iii) The porosity of scaffolds may be positively correlated with the release rate, and the porosity of 70%-80% may be better to control the release rate. This review indicates that a slow-release system with proper scaffold microstructure control could be a tremendous inspiration for developing new treatment strategies for bone disease. It is anticipated to eventually be developed into clinical applications to tackle treatment-related issues effectively.
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Affiliation(s)
- Baoqing Pei
- Beijing Key Laboratory for Design and Evaluation Technology of Advanced Implantable and Interventional Medical Devices, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Mengyuan Hu
- Beijing Key Laboratory for Design and Evaluation Technology of Advanced Implantable and Interventional Medical Devices, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Xueqing Wu
- Beijing Key Laboratory for Design and Evaluation Technology of Advanced Implantable and Interventional Medical Devices, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Da Lu
- Beijing Key Laboratory for Design and Evaluation Technology of Advanced Implantable and Interventional Medical Devices, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Shijia Zhang
- Beijing Key Laboratory for Design and Evaluation Technology of Advanced Implantable and Interventional Medical Devices, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Le Zhang
- Beijing Key Laboratory for Design and Evaluation Technology of Advanced Implantable and Interventional Medical Devices, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Shuqin Wu
- School of Big Data and Information, Shanxi College of Technology, Taiyuan, Shanxi, China
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Xie J, Hou X, He W, Xiao J, Cao Y, Liu X. Astaxanthin reduces fat storage in a fat-6/ fat-7 dependent manner determined using high fat Caenorhabditis elegans. Food Funct 2023; 14:7347-7360. [PMID: 37490309 DOI: 10.1039/d3fo01403g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/26/2023]
Abstract
Although astaxanthin has been shown to have high potential for weight loss, the specific action site and signal pathway generally cannot be confirmed in other animal models. This prevents us from finding therapeutic targets. Hence, we further illuminated its efficacy and specific action sites by using Caenorhabditis elegans (C. elegans). In this study, 60 μM astaxanthin supplementation reduced overall fat deposition and triglyceride levels by 21.47% and 22.00% (p < 0.01). The content of large lipid droplets was reversed after astaxanthin treatment, and the ratio of oleic acid/stearic acid (C18:1Δ9/C18:0) decreased significantly, which were essential substrates for triglyceride biosynthesis. In addition, astaxanthin prevented obesity caused by excessive energy accumulation and insufficient energy consumption. Furthermore, the above effects were induced by sbp-1/mdt-15 and insulin/insulin-like growth factor pathways, and finally co-regulated the specific site-fat-6 and fat-7 down-regulation. These results provided insight into therapeutic targets for future astaxanthin as a nutritional health product to relieve obesity.
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Affiliation(s)
- Junting Xie
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Guangzhou, 510642, Guangdong, China.
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou 510642, China
| | - Xiaoning Hou
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Guangzhou, 510642, Guangdong, China.
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou 510642, China
| | - Wanshi He
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Guangzhou, 510642, Guangdong, China.
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou 510642, China
| | - Jie Xiao
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Guangzhou, 510642, Guangdong, China.
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou 510642, China
| | - Yong Cao
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Guangzhou, 510642, Guangdong, China.
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou 510642, China
| | - Xiaojuan Liu
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Guangzhou, 510642, Guangdong, China.
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou 510642, China
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Smit T, Koppen S, Ferguson SJ, Helgason B. Conceptual design of compliant bone scaffolds by full-scale topology optimization. J Mech Behav Biomed Mater 2023; 143:105886. [PMID: 37150137 DOI: 10.1016/j.jmbbm.2023.105886] [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: 03/19/2023] [Revised: 04/30/2023] [Accepted: 05/01/2023] [Indexed: 05/09/2023]
Abstract
A promising new treatment for large and complex bone defects is to implant specifically designed and additively manufactured synthetic bone scaffolds. Optimizing the scaffold design can potentially improve bone in-growth and prevent under- and over-loading of the adjacent tissue. This study aims to optimize synthetic bone scaffolds over multiple-length scales using the full-scale topology optimization approach, and to assess the effectiveness of this approach as an alternative to the currently used mono- and multi-scale optimization approaches for orthopaedic applications. We present a topology optimization formulation, which is matching the scaffold's mechanical properties to the surrounding tissue in compression. The scaffold's porous structure is tuneable to achieve the desired morphological properties to enhance bone in-growth. The proposed approach is demonstrated in-silico, using PEEK, cortical bone and titanium material properties in a 2D parameter study and on 3D designs. Full-scale topology optimization indicates a design improvement of 81% compared to the multi-scale approach. Furthermore, 3D designs for PEEK and titanium are additively manufactured to test the applicability of the method. With further development, the full-scale topology optimization approach is anticipated to offer a more effective alternative for optimizing orthopaedic structures compared to the currently used multi-scale methods.
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Affiliation(s)
- Thijs Smit
- Institute for Biomechanics, ETH-Zürich, Zürich, Switzerland.
| | - Stijn Koppen
- Department of Precision and Microsystems Engineering, Delft University of Technology, Delft, the Netherlands
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Vaiani L, Boccaccio A, Uva AE, Palumbo G, Piccininni A, Guglielmi P, Cantore S, Santacroce L, Charitos IA, Ballini A. Ceramic Materials for Biomedical Applications: An Overview on Properties and Fabrication Processes. J Funct Biomater 2023; 14:146. [PMID: 36976070 PMCID: PMC10052110 DOI: 10.3390/jfb14030146] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2023] [Revised: 02/14/2023] [Accepted: 03/02/2023] [Indexed: 03/08/2023] Open
Abstract
A growing interest in creating advanced biomaterials with specific physical and chemical properties is currently being observed. These high-standard materials must be capable to integrate into biological environments such as the oral cavity or other anatomical regions in the human body. Given these requirements, ceramic biomaterials offer a feasible solution in terms of mechanical strength, biological functionality, and biocompatibility. In this review, the fundamental physical, chemical, and mechanical properties of the main ceramic biomaterials and ceramic nanocomposites are drawn, along with some primary related applications in biomedical fields, such as orthopedics, dentistry, and regenerative medicine. Furthermore, an in-depth focus on bone-tissue engineering and biomimetic ceramic scaffold design and fabrication is presented.
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Affiliation(s)
- Lorenzo Vaiani
- Department of Mechanics, Mathematics and Management, Polytechnic University of Bari, Via Orabona 4, 70125 Bari, Italy
| | - Antonio Boccaccio
- Department of Mechanics, Mathematics and Management, Polytechnic University of Bari, Via Orabona 4, 70125 Bari, Italy
| | - Antonio Emmanuele Uva
- Department of Mechanics, Mathematics and Management, Polytechnic University of Bari, Via Orabona 4, 70125 Bari, Italy
| | - Gianfranco Palumbo
- Department of Mechanics, Mathematics and Management, Polytechnic University of Bari, Via Orabona 4, 70125 Bari, Italy
| | - Antonio Piccininni
- Department of Mechanics, Mathematics and Management, Polytechnic University of Bari, Via Orabona 4, 70125 Bari, Italy
| | - Pasquale Guglielmi
- Department of Mechanics, Mathematics and Management, Polytechnic University of Bari, Via Orabona 4, 70125 Bari, Italy
| | - Stefania Cantore
- Independent Researcher, Sorriso & Benessere-Ricerca e Clinica, 70129 Bari, Italy
| | - Luigi Santacroce
- Microbiology and Virology Unit, Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70126 Bari, Italy
| | - Ioannis Alexandros Charitos
- Emergency/Urgency Department, National Poisoning Center, Riuniti University Hospital of Foggia, 71122 Foggia, Italy
| | - Andrea Ballini
- Department of Mechanics, Mathematics and Management, Polytechnic University of Bari, Via Orabona 4, 70125 Bari, Italy
- Department of Precision Medicine, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy
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11
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Chauhan A, Bhatt AD. A review on design of scaffold for osteoinduction: Toward the unification of independent design variables. Biomech Model Mechanobiol 2023; 22:1-21. [PMID: 36121530 DOI: 10.1007/s10237-022-01635-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Accepted: 09/05/2022] [Indexed: 11/29/2022]
Abstract
Biophysical stimulus quantifies the osteoinductivity of the scaffold concerning the mechanoregulatory mathematical models of scaffold-assisted cellular differentiation. Consider a set of independent structural variables ($) that comprises bulk porosity levels ([Formula: see text]) and a set of morphological features of the micro-structure ([Formula: see text]) associated with scaffolds, i.e., [Formula: see text]. The literature suggests that biophysical stimulus ([Formula: see text]) is a function of independent structural variables ($). Limited understanding of the functional correlation between biophysical stimulus and structural features results in the lack of the desired osteoinductivity in a scaffold. Consequently, it limits their broad applicability to assist bone tissue regeneration for treating critical-sized bone fractures. The literature indicates the existence of multi-dimensional independent design variable space as a probable reason for the general lack of osteoinductivity in scaffolds. For instance, known morphological features are the size, shape, orientation, continuity, and connectivity of the porous regions in the scaffold. It implies that the number of independent variables ([Formula: see text]) is more than two, i.e., [Formula: see text], which interact and influence the magnitude of [Formula: see text] in a unified manner. The efficiency of standard engineering design procedures to analyze the correlation between dependent variable ([Formula: see text]) and independent variables ($) in 3D mutually orthogonal Cartesian coordinate system diminishes proportionally with the increase in the number of independent variables ([Formula: see text]) (Deb in Optimization for engineering design-algorithms and examples, PHI Learning Private Limited, New Delhi, 2012). Therefore, there is an immediate need to devise a framework that has the potential to quantify the micro-structural's morphological features in a unified manner to increase the prospects of scaffold-assisted bone tissue regeneration.
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Affiliation(s)
- Atul Chauhan
- Department of Mechanical Engineering, Motilal Nehru National Institute of Technology Allahabad, Prayagraj, Uttar Pradesh, 211004, India.
| | - Amba D Bhatt
- Department of Mechanical Engineering, Motilal Nehru National Institute of Technology Allahabad, Prayagraj, Uttar Pradesh, 211004, India
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12
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Shum JM, Gadomski BC, Tredinnick SJ, Fok W, Fernandez J, Nelson B, Palmer RH, McGilvray KC, Hooper GJ, Puttlitz C, Easley J, Woodfield TBF. Enhanced bone formation in locally-optimised, low-stiffness additive manufactured titanium implants: An in silico and in vivo tibial advancement study. Acta Biomater 2023; 156:202-213. [PMID: 35413478 DOI: 10.1016/j.actbio.2022.04.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Revised: 04/05/2022] [Accepted: 04/05/2022] [Indexed: 01/18/2023]
Abstract
A tibial tuberosity advancement (TTA), used to treat lameness in the canine stifle, provides a framework to investigate implant performance within an uneven loading environment due to the dominating patellar tendon. The purpose of this study was to reassess how we design orthopaedic implants in a load-bearing model to investigate potential for improved osseointegration capacity of fully-scaffolded mechanically-matched additive manufactured (AM) implants. While the mechanobiological nature of bone is well known, we have identified a lower limit in the literature where investigation into exceedingly soft scaffolds relative to trabecular bone ceases due to the trade-off in mechanical strength. We developed a finite element model of the sheep stifle to assess the stresses and strains of homogeneous and locally-optimised TTA implant designs. Using additive manufacturing, we printed three different low-stiffness Ti-6Al-4 V TTA implants: 0.8 GPa (Ti1), 0.6 GPa (Ti2) and an optimised design with a 0.3 GPa cortex and 0.1 GPa centre (Ti3), for implantation in a 12-week in vivo ovine pilot study. Static histomorphometry demonstrated uniform bone ingrowth in optimised low-modulus Ti3 samples compared to homogeneous designs (Ti1 and Ti2), and greater bone-implant contact. Mineralising surfaces were apparent in all implants, though mineral apposition rate was only consistent throughout Ti3. The greatest bone formation scores were seen in Ti3, followed by Ti2 and Ti1. Results from our study suggest lower stiffnesses and higher strain ranges improve early bone formation, and that by accounting for loading environments through rational design, implants can be optimised to improve uniform osseointegration. STATEMENT OF SIGNIFICANCE: The effect of different strain ranges on bone healing has been traditionally investigated and characterised through computational models, with much of the literature suggesting higher strain ranges being favourable. However, little has been done to incorporate strain-optimisation into porous orthopaedic implants due to the trade-off in mechanical strength required to induce these microenvironments. In this study, we used finite element analysis to optimise the design of additive manufactured (AM) titanium orthopaedic implants for different strain ranges, using a clinically-relevant surgical model. Our research suggests that there is potential for locally-optimised AM scaffolds in the use of orthopaedic devices to induce higher strains, which in turn encourages de novo bone formation and uniform osseointegration.
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Affiliation(s)
- Josephine M Shum
- Christchurch Regenerative Medicine and Tissue Engineering (CReaTE) Group, Department of Orthopaedic Surgery & Musculoskeletal Medicine, Centre for Bioengineering & Nanomedicine, University of Otago, Christchurch, New Zealand
| | - Benjamin C Gadomski
- Orthopaedic Bioengineering Research Laboratory, Colorado State University, Fort Collins, CO, United States
| | - Seamus J Tredinnick
- Christchurch Regenerative Medicine and Tissue Engineering (CReaTE) Group, Department of Orthopaedic Surgery & Musculoskeletal Medicine, Centre for Bioengineering & Nanomedicine, University of Otago, Christchurch, New Zealand
| | - Wilson Fok
- Auckland Bioengineering Institute, University of Auckland, Auckland, New Zealand
| | - Justin Fernandez
- Auckland Bioengineering Institute, University of Auckland, Auckland, New Zealand
| | - Bradley Nelson
- Orthopaedic Bioengineering Research Laboratory, Colorado State University, Fort Collins, CO, United States
| | - Ross H Palmer
- Orthopaedic Bioengineering Research Laboratory, Colorado State University, Fort Collins, CO, United States
| | - Kirk C McGilvray
- Orthopaedic Bioengineering Research Laboratory, Colorado State University, Fort Collins, CO, United States
| | - Gary J Hooper
- Christchurch Regenerative Medicine and Tissue Engineering (CReaTE) Group, Department of Orthopaedic Surgery & Musculoskeletal Medicine, Centre for Bioengineering & Nanomedicine, University of Otago, Christchurch, New Zealand
| | - Christian Puttlitz
- Orthopaedic Bioengineering Research Laboratory, Colorado State University, Fort Collins, CO, United States
| | - Jeremiah Easley
- Orthopaedic Bioengineering Research Laboratory, Colorado State University, Fort Collins, CO, United States
| | - Tim B F Woodfield
- Christchurch Regenerative Medicine and Tissue Engineering (CReaTE) Group, Department of Orthopaedic Surgery & Musculoskeletal Medicine, Centre for Bioengineering & Nanomedicine, University of Otago, Christchurch, New Zealand.
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13
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Daghrery A, de Souza Araújo IJ, Castilho M, Malda J, Bottino MC. Unveiling the potential of melt electrowriting in regenerative dental medicine. Acta Biomater 2023; 156:88-109. [PMID: 35026478 PMCID: PMC11046422 DOI: 10.1016/j.actbio.2022.01.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Revised: 12/08/2021] [Accepted: 01/05/2022] [Indexed: 01/18/2023]
Abstract
For nearly three decades, tissue engineering strategies have been leveraged to devise effective therapeutics for dental, oral, and craniofacial (DOC) regenerative medicine and treat permanent deformities caused by many debilitating health conditions. In this regard, additive manufacturing (AM) allows the fabrication of personalized scaffolds that have the potential to recapitulate native tissue morphology and biomechanics through the utilization of several 3D printing techniques. Among these, melt electrowriting (MEW) is a versatile direct electrowriting process that permits the development of well-organized fibrous constructs with fiber resolutions ranging from micron to nanoscale. Indeed, MEW offers great prospects for the fabrication of scaffolds mimicking tissue specificity, healthy and pathophysiological microenvironments, personalized multi-scale transitions, and functional interfaces for tissue regeneration in medicine and dentistry. Excitingly, recent work has demonstrated the potential of converging MEW with other AM technologies and/or cell-laden scaffold fabrication (bioprinting) as a favorable route to overcome some of the limitations of MEW for DOC tissue regeneration. In particular, such convergency fabrication strategy has opened great promise in terms of supporting multi-tissue compartmentalization and predetermined cell commitment. In this review, we offer a critical appraisal on the latest advances in MEW and its convergence with other biofabrication technologies for DOC tissue regeneration. We first present the engineering principles of MEW and the most relevant design aspects for transition from flat to more anatomically relevant 3D structures while printing highly-ordered constructs. Secondly, we provide a thorough assessment of contemporary achievements using MEW scaffolds to study and guide soft and hard tissue regeneration, and draw a parallel on how to extrapolate proven concepts for applications in DOC tissue regeneration. Finally, we offer a combined engineering/clinical perspective on the fabrication of hierarchically organized MEW scaffold architectures and the future translational potential of site-specific, single-step scaffold fabrication to address tissue and tissue interfaces in dental, oral, and craniofacial regenerative medicine. STATEMENT OF SIGNIFICANCE: Melt electrowriting (MEW) techniques can further replicate the complexity of native tissues and could be the foundation for novel personalized (defect-specific) and tissue-specific clinical approaches in regenerative dental medicine. This work presents a unique perspective on how MEW has been translated towards the application of highly-ordered personalized multi-scale and functional interfaces for tissue regeneration, targeting the transition from flat to anatomically-relevant three-dimensional structures. Furthermore, we address the value of convergence of biofabrication technologies to overcome the traditional manufacturing limitations provided by multi-tissue complexity. Taken together, this work offers abundant engineering and clinical perspectives on the fabrication of hierarchically MEW architectures aiming towards site-specific implants to address complex tissue damage in regenerative dental medicine.
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Affiliation(s)
- Arwa Daghrery
- Department of Cardiology, Restorative Sciences, and Endodontics, University of Michigan, School of Dentistry, Ann Arbor, Michigan, United States; Department of Restorative Dental Sciences, School of Dentistry, Jazan University, Jazan, Saudi Arabia
| | - Isaac J de Souza Araújo
- Department of Cardiology, Restorative Sciences, and Endodontics, University of Michigan, School of Dentistry, Ann Arbor, Michigan, United States
| | - Miguel Castilho
- Regenerative Medicine Center, University Medical Center Utrecht, Utrecht, the Netherlands; Department of Orthopedics, University Medical Center Utrecht, Utrecht, the Netherlands; Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands
| | - Jos Malda
- Regenerative Medicine Center, University Medical Center Utrecht, Utrecht, the Netherlands; Department of Orthopedics, University Medical Center Utrecht, Utrecht, the Netherlands; Department of Clinical Sciences, Faculty of Veterinary Medicine, Utrecht University, Utrecht, the Netherlands.
| | - Marco C Bottino
- Department of Cardiology, Restorative Sciences, and Endodontics, University of Michigan, School of Dentistry, Ann Arbor, Michigan, United States; Department of Biomedical Engineering, College of Engineering, University of Michigan, Ann Arbor, Michigan, United States.
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14
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Pires THV, Dunlop JWC, Castro APG, Fernandes PR. Wall Shear Stress Analysis and Optimization in Tissue Engineering TPMS Scaffolds. MATERIALS (BASEL, SWITZERLAND) 2022; 15:7375. [PMID: 36295440 PMCID: PMC9612273 DOI: 10.3390/ma15207375] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 09/28/2022] [Accepted: 10/19/2022] [Indexed: 06/16/2023]
Abstract
When designing scaffolds for bone tissue engineering (BTE), the wall shear stress (WSS), due to the fluid flow inside the scaffold, is an important factor to consider as it influences the cellular process involved in new tissue formation. The present work analyzed the average WSS in Schwartz diamond (SD) and gyroid (SG) scaffolds with different surface topologies and mesh elements using computational fluid dynamics (CFD) analysis. It was found that scaffold meshes with a smooth surface topology with tetrahedral elements had WSS levels 35% higher than the equivalent scaffold with a non-smooth surface topology with hexahedral elements. The present work also investigated the possibility of implementing the optimization algorithm simulated annealing to aid in the design of BTE scaffolds with a specific average WSS, with the outputs showing that the algorithm was able to reach WSS levels in the vicinity of 5 mPa (physiological range) within the established limit of 100 iterations. This proved the efficacy of combining CFD and optimization methods in the design of BTE scaffolds.
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Affiliation(s)
- Tiago H. V. Pires
- IDMEC, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal
| | - John W. C. Dunlop
- MorphoPhysics Group, Department of the Chemistry and Physics of Materials, University of Salzburg, 5020 Salzburg, Austria
| | - André P. G. Castro
- IDMEC, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal
- ESTSetúbal, Instituto Politécnico de Setúbal, 2914-761 Setúbal, Portugal
| | - Paulo R. Fernandes
- IDMEC, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal
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15
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Perier-Metz C, Duda GN, Checa S. A mechanobiological computer optimization framework to design scaffolds to enhance bone regeneration. Front Bioeng Biotechnol 2022; 10:980727. [PMID: 36159680 PMCID: PMC9490117 DOI: 10.3389/fbioe.2022.980727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Accepted: 08/16/2022] [Indexed: 11/16/2022] Open
Abstract
The treatment of large bone defects is a clinical challenge. 3D printed scaffolds are a promising treatment option for such critical-size defects. However, the design of scaffolds to treat such defects is challenging due to the large number of variables impacting bone regeneration; material stiffness, architecture or equivalent scaffold stiffness—due it specific architecture—have all been demonstrated to impact cell behavior and regeneration outcome. Computer design optimization is a powerful tool to find optimal design solutions within a large parameter space for given anatomical constraints. Following this approach, scaffold structures have been optimized to avoid mechanical failure while providing beneficial mechanical stimulation for bone formation within the scaffold pores immediately after implantation. However, due to the dynamics of the bone regeneration process, the mechanical conditions do change from immediately after surgery throughout healing, thus influencing the regeneration process. Therefore, we propose a computer framework to optimize scaffold designs that allows to promote the final bone regeneration outcome. The framework combines a previously developed and validated mechanobiological bone regeneration computer model, a surrogate model for bone healing outcome and an optimization algorithm to optimize scaffold design based on the level of regenerated bone volume. The capability of the framework is verified by optimization of a cylindrical scaffold for the treatment of a critical-size tibia defect, using a clinically relevant large animal model. The combined framework allowed to predict the long-term healing outcome. Such novel approach opens up new opportunities for sustainable strategies in scaffold designs of bone regeneration.
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Affiliation(s)
- Camille Perier-Metz
- Berlin Institute of Health at Charité, Julius Wolff Institute, Universitätsmedizin Berlin, Berlin, Germany
- MINES ParisTech, PSL Research University, Paris, France
| | - Georg N. Duda
- Berlin Institute of Health at Charité, Julius Wolff Institute, Universitätsmedizin Berlin, Berlin, Germany
| | - Sara Checa
- Berlin Institute of Health at Charité, Julius Wolff Institute, Universitätsmedizin Berlin, Berlin, Germany
- *Correspondence: Sara Checa,
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16
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Murchio S, Benedetti M, Berto A, Agostinacchio F, Zappini G, Maniglio D. Hybrid Ti6Al4V/Silk Fibroin Composite for Load-Bearing Implants: A Hierarchical Multifunctional Cellular Scaffold. MATERIALS (BASEL, SWITZERLAND) 2022; 15:6156. [PMID: 36079541 PMCID: PMC9458142 DOI: 10.3390/ma15176156] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 08/30/2022] [Accepted: 09/02/2022] [Indexed: 06/15/2023]
Abstract
Despite the tremendous technological advances that metal additive manufacturing (AM) has made in the last decades, there are still some major concerns guaranteeing its massive industrial application in the biomedical field. Indeed, some main limitations arise in dealing with their biological properties, specifically in terms of osseointegration. Morphological accuracy of sub-unital elements along with the printing resolution are major constraints in the design workspace of a lattice, hindering the possibility of manufacturing structures optimized for proper osteointegration. To overcome these issues, the authors developed a new hybrid multifunctional composite scaffold consisting of an AM Ti6Al4V lattice structure and a silk fibroin/gelatin foam. The composite was realized by combining laser powder bed fusion (L-PBF) of simple cubic lattice structures with foaming techniques. A combined process of foaming and electrodeposition has been also evaluated. The multifunctional scaffolds were characterized to evaluate their pore size, morphology, and distribution as well as their adhesion and behavior at the metal-polymer interface. Pull-out tests in dry and hydrated conditions were employed for the mechanical characterization. Additionally, a cytotoxicity assessment was performed to preliminarily evaluate their potential application in the biomedical field as load-bearing next-generation medical devices.
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Affiliation(s)
- Simone Murchio
- Department of Industrial Engineering–DII, University of Trento, 38123 Trento, Italy
- BIOtech Research Center, University of Trento, 38122 Trento, Italy
| | - Matteo Benedetti
- BIOtech Research Center, University of Trento, 38122 Trento, Italy
| | - Anastasia Berto
- BIOtech Research Center, University of Trento, 38122 Trento, Italy
| | - Francesca Agostinacchio
- Department of Industrial Engineering–DII, University of Trento, 38123 Trento, Italy
- BIOtech Research Center, University of Trento, 38122 Trento, Italy
| | | | - Devid Maniglio
- Department of Industrial Engineering–DII, University of Trento, 38123 Trento, Italy
- BIOtech Research Center, University of Trento, 38122 Trento, Italy
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17
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Lowen GB, Garrett KA, Moore-Lotridge SN, Uppuganti S, Guelcher SA, Schoenecker JG, Nyman JS. Effect of Intramedullary Nailing Patterns on Interfragmentary Strain in a Mouse Femur Fracture: A Parametric Finite Element Analysis. J Biomech Eng 2022; 144:051007. [PMID: 34802060 PMCID: PMC8822464 DOI: 10.1115/1.4053085] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 11/17/2021] [Indexed: 11/08/2022]
Abstract
Delayed long bone fracture healing and nonunion continue to be a significant socioeconomic burden. While mechanical stimulation is known to be an important determinant of the bone repair process, understanding how the magnitude, mode, and commencement of interfragmentary strain (IFS) affect fracture healing can guide new therapeutic strategies to prevent delayed healing or nonunion. Mouse models provide a means to investigate the molecular and cellular aspects of fracture repair, yet there is only one commercially available, clinically-relevant, locking intramedullary nail (IMN) currently available for studying long bone fractures in rodents. Having access to alternative IMNs would allow a variety of mechanical environments at the fracture site to be evaluated, and the purpose of this proof-of-concept finite element analysis study is to identify which IMN design parameters have the largest impact on IFS in a murine transverse femoral osteotomy model. Using the dimensions of the clinically relevant IMN as a guide, the nail material, distance between interlocking screws, and clearance between the nail and endosteal surface were varied between simulations. Of these parameters, changing the nail material from stainless steel (SS) to polyetheretherketone (PEEK) had the largest impact on IFS. Reducing the distance between the proximal and distal interlocking screws substantially affected IFS only when nail modulus was low. Therefore, IMNs with low modulus (e.g., PEEK) can be used alongside commercially available SS nails to investigate the effect of initial IFS or stability on fracture healing with respect to different biological conditions of repair in rodents.
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Affiliation(s)
- Gregory B. Lowen
- Vanderbilt University, Department of Chemical and Biomolecular Engineering, 2201 West End Ave, Nashville, TN 37235
| | - Katherine A. Garrett
- Vanderbilt University Medical Center, Department of Orthopaedic Surgery, 1215 21 Ave. S., Suite 4200, Nashville, TN 37232
| | - Stephanie N. Moore-Lotridge
- Vanderbilt University Medical Center, Department of Orthopaedic Surgery, 1215 21 Ave. S., Suite 4200, Nashville, TN 37232;Vanderbilt University Medical Center, Vanderbilt Center for Bone Biology, 1211 Medical Center Dr., Nashville, TN 37212
| | - Sasidhar Uppuganti
- Vanderbilt University Medical Center, Department of Orthopaedic Surgery, 1215 21 Ave. S., Suite 4200, Nashville, TN 37232;Vanderbilt University Medical Center, Vanderbilt Center for Bone Biology, 1211 Medical Center Dr., Nashville, TN 37212
| | - Scott A. Guelcher
- Vanderbilt University, Department of Chemical and Biomolecular Engineering, 2201 West End Ave, Nashville, TN 37235; Vanderbilt University, Department of Biomedical Engineering, 5824 Stevenson Center, Nashville, TN 37232; Vanderbilt University Medical Center, Vanderbilt Center for Bone Biology, 1211 Medical Center Dr., Nashville, TN 37212; Vanderbilt University Medical Center, Division of Clinical Pharmacology, 1211 Medical Center Dr, Nashville, TN 37217
| | - Jonathan G. Schoenecker
- Vanderbilt University, Department of Pharmacology, 465 21 Ave South, 7124 Medical Research Building III, Nashville, TN 37232; Vanderbilt University Medical Center, Vanderbilt Center for Bone Biology, 1211 Medical Center Dr., Nashville, TN 37212; Vanderbilt University Medical Center, Department of Pathology, Microbiology, and Immunology, 1161 21 Ave S C-3322 Medical Center North, Nashville, TN 37232; Vanderbilt University Medical Center, Department of Pediatrics, 2200 Children's Way, Suite 2404, Nashville, TN 37232
| | - Jeffry S. Nyman
- Vanderbilt University, Department of Biomedical Engineering, 5824 Stevenson Center, Nashville, TN 37232; Vanderbilt University Medical Center, Department of Orthopaedic Surgery, 1215 21 Ave. S., Suite 4200, Nashville, TN 37232; Vanderbilt University Medical Center, Vanderbilt Center for Bone Biology, 1211 Medical Center Dr., Nashville, TN 37212; Tennessee Valley Healthcare System, Department of Veterans Affairs, 1310 24 Ave. S, Nashville, TN 37212
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18
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Pires T, Dunlop JWC, Fernandes PR, Castro APG. Challenges in computational fluid dynamics applications for bone tissue engineering. Proc Math Phys Eng Sci 2022; 478:20210607. [PMID: 35153613 PMCID: PMC8791047 DOI: 10.1098/rspa.2021.0607] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Accepted: 12/13/2021] [Indexed: 12/21/2022] Open
Abstract
Bone injuries or defects that require invasive surgical treatment are a serious clinical issue, particularly when it comes to treatment success and effectiveness. Accordingly, bone tissue engineering (BTE) has been researching the use of computational fluid dynamics (CFD) analysis tools to assist in designing optimal scaffolds that better promote bone growth and repair. This paper aims to offer a comprehensive review of recent studies that use CFD analysis in BTE. The mechanical and fluidic properties of a given scaffold are coupled to each other via the scaffold architecture, meaning an optimization of one may negatively affect the other. For example, designs that improve scaffold permeability normally result in a decreased average wall shear stress. Linked with these findings, it appears there are very few studies in this area that state a specific application for their scaffolds and those that do are focused on in vitro bioreactor environments. Finally, this review also demonstrates a scarcity of studies that combine CFD with optimization methods to improve scaffold design. This highlights an important direction of research for the development of the next generation of BTE scaffolds.
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Affiliation(s)
- Tiago Pires
- IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
| | - John W C Dunlop
- MorphoPhysics Group, Department of the Chemistry and Physics of Materials, University of Salzburg, Salzburg, Austria
| | | | - André P G Castro
- IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
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19
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Gortsas TV, Tsinopoulos SV, Polyzos E, Pyl L, Fotiadis DI, Polyzos D. BEM evaluation of surface octahedral strains and internal strain gradients in 3D-printed scaffolds used for bone tissue regeneration. J Mech Behav Biomed Mater 2021; 125:104919. [PMID: 34740014 DOI: 10.1016/j.jmbbm.2021.104919] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Revised: 10/20/2021] [Accepted: 10/20/2021] [Indexed: 10/20/2022]
Abstract
Most of the mechnoregulatory computational models appearing so far in tissue engineering for bone healing predictions, utilize as regulators for cell differentiation mainly the octahedral volume strains and the interstitial fluid velocity calculated at any point of the fractured bone area and controlled by empirical constants concerning these two parameters. Other stimuli like the electrical and chemical signaling of bone constituents are covered by those two regulatory fields. It is apparent that the application of the same mechnoregulatory computational models for bone healing predictions in scaffold-aided regeneration is questionable since the material of a scaffold disturbs the signaling pathways developed in the environment of bone fracture. Thus, the goal of the present work is to evaluate numerically two fields developed in the body of two different compressed scaffolds, which seem to be proper for facilitating cell sensing and improving cell viability and cell seeding efficiency. These two fields concern the surface octahedral strains that the cells attached to the scaffold can experience and the internal strain gradients that create electrical pathways due to flexoelectric phenomenon. Both fields are evaluated with the aid of the Boundary Element Method (BEM), which is ideal for evaluating with high accuracy surface strains and stresses as well as strain gradients appearing throughout the analyzed elastic domain.
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Affiliation(s)
- T V Gortsas
- Department of Mechanical Engineering and Aeronautics, University of Patras, Greece.
| | - S V Tsinopoulos
- Department of Mechanical Engineering, University of Peloponnese, Greece
| | - E Polyzos
- Department of Mechanics of Materials and Constructions, Vrije Universiteit Brussel (VUB), BE-1050, Brussels, Belgium
| | - L Pyl
- Department of Mechanics of Materials and Constructions, Vrije Universiteit Brussel (VUB), BE-1050, Brussels, Belgium
| | - D I Fotiadis
- Unit of Medical Technology and Intelligent Information Systems, Dept. of Material Science and Engineering, University of Ioannina, GR 451 10, Ioannina, Greece
| | - D Polyzos
- Department of Mechanical Engineering and Aeronautics, University of Patras, Greece
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20
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Simulated tissue growth in tetragonal lattices with mechanical stiffness tuned for bone tissue engineering. Comput Biol Med 2021; 138:104913. [PMID: 34619409 DOI: 10.1016/j.compbiomed.2021.104913] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2021] [Revised: 09/12/2021] [Accepted: 09/27/2021] [Indexed: 11/22/2022]
Abstract
Bone tissue engineering approaches have recently begun considering 3D printed lattices as viable scaffold solutions due to their highly tunable geometries and mechanical efficiency. However, scaffold design remains challenging due to the numerous biological and mechanical trade-offs related to lattice geometry. Here, we investigate novel tetragonal unit cell designs by independently adjusting unit cell height and width to find scaffolds with improved tissue growth while maintaining suitable scaffold mechanical properties for bone tissue engineering. Lattice tissue growth behavior is evaluated using a curvature-based growth model while elastic modulus is evaluated with finite element analysis. Computationally efficient modeling approaches are implemented to facilitate bulk analysis of lattice design trade-offs using design maps for biological and mechanical functionalities in relation to unit cell height and width for two contrasting unit cell topologies. Newly designed tetragonal lattices demonstrate higher tissue growth per unit volume and advantageous stiffness in preferred directions compared to cubically symmetric unit cells. When lattice beam diameter is fixed to 200 μm, Tetra and BC-Tetra lattices with elastic moduli of 200 MPa-400 MPa are compared for squashed, cubic, and stretched topologies. Squashed Tetra lattices demonstrated higher growth rates and growth densities compared to symmetrically cubic lattices. BC-Tetra lattices with the same range of elastic moduli show squashed lattices tend to achieve higher growth rates, whereas stretched lattices promote higher growth density. The results suggest tetragonal unit cells provide favorable properties for biological and mechanical tailoring, therefore enabling new strategies for diverse patient needs and applications in regenerative medicine.
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21
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Blázquez-Carmona P, Sanz-Herrera JA, Martínez-Vázquez FJ, Domínguez J, Reina-Romo E. Structural optimization of 3D-printed patient-specific ceramic scaffolds for in vivo bone regeneration in load-bearing defects. J Mech Behav Biomed Mater 2021; 121:104613. [PMID: 34126507 DOI: 10.1016/j.jmbbm.2021.104613] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Revised: 05/26/2021] [Accepted: 05/27/2021] [Indexed: 02/06/2023]
Abstract
Tissue engineering has recently gained popularity as an alternative to autografts to stimulate bone tissue regeneration through structures called scaffolds. Most of the in vivo experiments on long-bony defects use internally-stabilized generic scaffolds. Despite the wide variety of computational methods, a standardized protocol is required to optimize ceramic scaffolds for load-bearing bony defects stabilized with flexible fixations. An optimization problem was defined for applications to sheep metatarsus defects. It covers biological parameters (porosity, pore size, and the specific surface area) and mechanical constraints based on in vivo and in vitro results reported in the literature. The optimized parameters (59.30% of porosity, 5768.91 m-1 of specific surface area, and 360.80 μm of pore size) and the compressive strength of the selected structure were validated in vitro by means of tomographic images and compression tests of six 3D-printed samples. Divergences between the design and measured values of the optimized parameters, mainly due to manufacturing defects, are consistent with the previous studies. Using the mixed experimental-mathematical scaffold-design procedure described, they could be implanted in vivo with instrumented external fixators, therefore facilitating biomechanical monitoring of the regeneration process.
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Affiliation(s)
- Pablo Blázquez-Carmona
- E.T.S.I, Universidad de Sevilla, Avenida Camino de los Descubrimientos s/n, 41092, Seville, Spain.
| | | | | | - Jaime Domínguez
- E.T.S.I, Universidad de Sevilla, Avenida Camino de los Descubrimientos s/n, 41092, Seville, Spain.
| | - Esther Reina-Romo
- E.T.S.I, Universidad de Sevilla, Avenida Camino de los Descubrimientos s/n, 41092, Seville, Spain.
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Perier-Metz C, Duda GN, Checa S. Initial mechanical conditions within an optimized bone scaffold do not ensure bone regeneration - an in silico analysis. Biomech Model Mechanobiol 2021; 20:1723-1731. [PMID: 34097188 PMCID: PMC8450217 DOI: 10.1007/s10237-021-01472-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Accepted: 05/28/2021] [Indexed: 11/26/2022]
Abstract
Large bone defects remain a clinical challenge because they do not heal spontaneously. 3-D printed scaffolds are a promising treatment option for such critical defects. Recent scaffold design strategies have made use of computer modelling techniques to optimize scaffold design. In particular, scaffold geometries have been optimized to avoid mechanical failure and recently also to provide a distinct mechanical stimulation to cells within the scaffold pores. This way, mechanical strain levels are optimized to favour the bone tissue formation. However, bone regeneration is a highly dynamic process where the mechanical conditions immediately after surgery might not ensure optimal regeneration throughout healing. Here, we investigated in silico whether scaffolds presenting optimal mechanical conditions for bone regeneration immediately after surgery also present an optimal design for the full regeneration process. A computer framework, combining an automatic parametric scaffold design generation with a mechano-biological bone regeneration model, was developed to predict the level of regenerated bone volume for a large range of scaffold designs and to compare it with the scaffold pore volume fraction under favourable mechanical stimuli immediately after surgery. We found that many scaffold designs could be considered as highly beneficial for bone healing immediately after surgery; however, most of them did not show optimal bone formation in later regenerative phases. This study allowed to gain a more thorough understanding of the effect of scaffold geometry changes on bone regeneration and how to maximize regenerated bone volume in the long term.
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Affiliation(s)
- Camille Perier-Metz
- Julius Wolff Institute, Berlin Institute of Health at Charité - Universitätsmedizin Berlin, Berlin, Germany
- MINES ParisTech - PSL Research University, Paris, France
| | - Georg N Duda
- Julius Wolff Institute, Berlin Institute of Health at Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Sara Checa
- Julius Wolff Institute, Berlin Institute of Health at Charité - Universitätsmedizin Berlin, Berlin, Germany.
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Application of Computational Method in Designing a Unit Cell of Bone Tissue Engineering Scaffold: A Review. Polymers (Basel) 2021; 13:polym13101584. [PMID: 34069101 PMCID: PMC8156807 DOI: 10.3390/polym13101584] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Revised: 05/11/2021] [Accepted: 05/12/2021] [Indexed: 12/27/2022] Open
Abstract
The design of a scaffold of bone tissue engineering plays an important role in ensuring cell viability and cell growth. Therefore, it is a necessity to produce an ideal scaffold by predicting and simulating the properties of the scaffold. Hence, the computational method should be adopted since it has a huge potential to be used in the implementation of the scaffold of bone tissue engineering. To explore the field of computational method in the area of bone tissue engineering, this paper provides an overview of the usage of a computational method in designing a unit cell of bone tissue engineering scaffold. In order to design a unit cell of the scaffold, we discussed two categories of unit cells that can be used to design a feasible scaffold, which are non-parametric and parametric designs. These designs were later described and being categorised into multiple types according to their characteristics, such as circular structures and Triply Periodic Minimal Surface (TPMS) structures. The advantages and disadvantages of these designs were discussed. Moreover, this paper also represents some software that was used in simulating and designing the bone tissue scaffold. The challenges and future work recommendations had also been included in this paper.
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Perier-Metz C, Duda GN, Checa S. Mechano-Biological Computer Model of Scaffold-Supported Bone Regeneration: Effect of Bone Graft and Scaffold Structure on Large Bone Defect Tissue Patterning. Front Bioeng Biotechnol 2020; 8:585799. [PMID: 33262976 PMCID: PMC7686036 DOI: 10.3389/fbioe.2020.585799] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Accepted: 10/05/2020] [Indexed: 12/04/2022] Open
Abstract
Large segmental bone defects represent a clinical challenge for which current treatment procedures have many drawbacks. 3D-printed scaffolds may help to support healing, but their design process relies mainly on trial and error due to a lack of understanding of which scaffold features support bone regeneration. The aim of this study was to investigate whether existing mechano-biological rules of bone regeneration can also explain scaffold-supported bone defect healing. In addition, we examined the distinct roles of bone grafting and scaffold structure on the regeneration process. To that end, scaffold-surface guided migration and tissue deposition as well as bone graft stimulatory effects were included in an in silico model and predictions were compared to in vivo data. We found graft osteoconductive properties and scaffold-surface guided extracellular matrix deposition to be essential features driving bone defect filling in a 3D-printed honeycomb titanium structure. This knowledge paves the way for the design of more effective 3D scaffold structures and their pre-clinical optimization, prior to their application in scaffold-based bone defect regeneration.
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Affiliation(s)
- Camille Perier-Metz
- Julius Wolff Institute, Charité-Universitätsmedizin, Berlin, Germany.,MINES ParisTech - PSL Research University (Paris Sciences & Lettres), Paris, France
| | - Georg N Duda
- Julius Wolff Institute, Charité-Universitätsmedizin, Berlin, Germany.,Berlin Institute of Health (BIH) Center for Regenerative Therapies, Charité-Universitätsmedizin, Berlin, Germany
| | - Sara Checa
- Julius Wolff Institute, Charité-Universitätsmedizin, Berlin, Germany
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Rodríguez-Montaño ÓL, Cortés-Rodríguez CJ, Uva AE, Fiorentino M, Gattullo M, Manghisi VM, Boccaccio A. An Algorithm to Optimize the Micro-Geometrical Dimensions of Scaffolds with Spherical Pores. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E4062. [PMID: 32933165 PMCID: PMC7559891 DOI: 10.3390/ma13184062] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Revised: 09/09/2020] [Accepted: 09/11/2020] [Indexed: 12/12/2022]
Abstract
Despite the wide use of scaffolds with spherical pores in the clinical context, no studies are reported in the literature that optimize the micro-architecture dimensions of such scaffolds to maximize the amounts of neo-formed bone. In this study, a mechanobiology-based optimization algorithm was implemented to determine the optimal geometry of scaffolds with spherical pores subjected to both compression and shear loading. We found that these scaffolds are particularly suited to bear shear loads; the amounts of bone predicted to form for this load type are, in fact, larger than those predicted in other scaffold geometries. Knowing the anthropometric characteristics of the patient, one can hypothesize the possible value of load acting on the scaffold that will be implanted and, through the proposed algorithm, determine the optimal dimensions of the scaffold that favor the formation of the largest amounts of bone. The proposed algorithm can guide and support the surgeon in the choice of a "personalized" scaffold that better suits the anthropometric characteristics of the patient, thus allowing to achieve a successful follow-up in the shortest possible time.
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Affiliation(s)
- Óscar Libardo Rodríguez-Montaño
- Departamento de Ingeniería Mecánica y Mecatrónica, Universidad Nacional de Colombia, 111321 Bogotá, Colombia; (Ó.L.R.-M.); (C.J.C.-R.)
- Dipartimento di Meccanica, Matematica e Management, Politecnico di Bari, 70125 Bari, Italy; (A.E.U.); (M.F.); (M.G.); (V.M.M.)
| | - Carlos Julio Cortés-Rodríguez
- Departamento de Ingeniería Mecánica y Mecatrónica, Universidad Nacional de Colombia, 111321 Bogotá, Colombia; (Ó.L.R.-M.); (C.J.C.-R.)
| | - Antonio Emmanuele Uva
- Dipartimento di Meccanica, Matematica e Management, Politecnico di Bari, 70125 Bari, Italy; (A.E.U.); (M.F.); (M.G.); (V.M.M.)
| | - Michele Fiorentino
- Dipartimento di Meccanica, Matematica e Management, Politecnico di Bari, 70125 Bari, Italy; (A.E.U.); (M.F.); (M.G.); (V.M.M.)
| | - Michele Gattullo
- Dipartimento di Meccanica, Matematica e Management, Politecnico di Bari, 70125 Bari, Italy; (A.E.U.); (M.F.); (M.G.); (V.M.M.)
| | - Vito Modesto Manghisi
- Dipartimento di Meccanica, Matematica e Management, Politecnico di Bari, 70125 Bari, Italy; (A.E.U.); (M.F.); (M.G.); (V.M.M.)
| | - Antonio Boccaccio
- Dipartimento di Meccanica, Matematica e Management, Politecnico di Bari, 70125 Bari, Italy; (A.E.U.); (M.F.); (M.G.); (V.M.M.)
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Castilho M, de Ruijter M, Beirne S, Villette CC, Ito K, Wallace GG, Malda J. Multitechnology Biofabrication: A New Approach for the Manufacturing of Functional Tissue Structures? Trends Biotechnol 2020; 38:1316-1328. [PMID: 32466965 DOI: 10.1016/j.tibtech.2020.04.014] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Revised: 04/03/2020] [Accepted: 04/29/2020] [Indexed: 01/25/2023]
Abstract
Most available 3D biofabrication technologies rely on single-component deposition methods, such as inkjet, extrusion, or light-assisted printing. It is unlikely that any of these technologies used individually would be able to replicate the complexity and functionality of living tissues. Recently, new biofabrication approaches have emerged that integrate multiple manufacturing technologies into a single biofabrication platform. This has led to fabricated structures with improved functionality. In this review, we provide a comprehensive overview of recent advances in the integration of different manufacturing technologies with the aim to fabricate more functional tissue structures. We provide our vision on the future of additive manufacturing (AM) technology, digital design, and the use of artificial intelligence (AI) in the field of biofabrication.
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Affiliation(s)
- Miguel Castilho
- Department of Orthopaedics, University Medical Center Utrecht, Utrecht, The Netherlands; Orthopaedic Biomechanics, Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands; Regenerative Medicine Center Utrecht, Utrecht, The Netherlands.
| | - Mylène de Ruijter
- Department of Orthopaedics, University Medical Center Utrecht, Utrecht, The Netherlands; Regenerative Medicine Center Utrecht, Utrecht, The Netherlands
| | - Stephen Beirne
- Intelligent Polymer Research Institute, and ARC Centre of Excellence for Electromaterials Science, University of Wollongong, Wollongong, Australia
| | - Claire C Villette
- Structural Biomechanics, Department of Civil and Environmental Engineering, Imperial College London, London, UK
| | - Keita Ito
- Department of Orthopaedics, University Medical Center Utrecht, Utrecht, The Netherlands; Orthopaedic Biomechanics, Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands; Regenerative Medicine Center Utrecht, Utrecht, The Netherlands
| | - Gordon G Wallace
- Intelligent Polymer Research Institute, and ARC Centre of Excellence for Electromaterials Science, University of Wollongong, Wollongong, Australia
| | - Jos Malda
- Department of Orthopaedics, University Medical Center Utrecht, Utrecht, The Netherlands; Regenerative Medicine Center Utrecht, Utrecht, The Netherlands; Department of Clinical Sciences, Faculty of Veterinary Sciences Utrecht University, Utrecht, The Netherlands
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27
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Percoco G, Uva AE, Fiorentino M, Gattullo M, Manghisi VM, Boccaccio A. Mechanobiological Approach to Design and Optimize Bone Tissue Scaffolds 3D Printed with Fused Deposition Modeling: A Feasibility Study. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E648. [PMID: 32024158 PMCID: PMC7041376 DOI: 10.3390/ma13030648] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/21/2019] [Revised: 01/20/2020] [Accepted: 01/28/2020] [Indexed: 12/11/2022]
Abstract
In spite of the rather large use of the fused deposition modeling (FDM) technique for the fabrication of scaffolds, no studies are reported in the literature that optimize the geometry of such scaffold types based on mechanobiological criteria. We implemented a mechanobiology-based optimization algorithm to determine the optimal distance between the strands in cylindrical scaffolds subjected to compression. The optimized scaffolds were then 3D printed with the FDM technique and successively measured. We found that the difference between the optimized distances and the average measured ones never exceeded 8.27% of the optimized distance. However, we found that large fabrication errors are made on the filament diameter when the filament diameter to be realized differs significantly with respect to the diameter of the nozzle utilized for the extrusion. This feasibility study demonstrated that the FDM technique is suitable to build accurate scaffold samples only in the cases where the strand diameter is close to the nozzle diameter. Conversely, when a large difference exists, large fabrication errors can be committed on the diameter of the filaments. In general, the scaffolds realized with the FDM technique were predicted to stimulate the formation of amounts of bone smaller than those that can be obtained with other regular beam-based scaffolds.
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Affiliation(s)
| | | | | | | | | | - Antonio Boccaccio
- Dipartimento di Meccanica, Matematica e Management, Politecnico di Bari, Via E. Orabona 4, 70126 Bari, Italy; (G.P.); (A.E.U.); (M.F.); (M.G.); (V.M.M.)
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28
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Abbasi N, Ivanovski S, Gulati K, Love RM, Hamlet S. Role of offset and gradient architectures of 3-D melt electrowritten scaffold on differentiation and mineralization of osteoblasts. Biomater Res 2020; 24:2. [PMID: 31911842 PMCID: PMC6942301 DOI: 10.1186/s40824-019-0180-z] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Accepted: 12/17/2019] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Cell-scaffold based therapies have the potential to offer an efficient osseous regenerative treatment and PCL has been commonly used as a scaffold, however its effectiveness is limited by poor cellular retention properties. This may be improved through a porous scaffold structure with efficient pore arrangement to increase cell entrapment. To facilitate this, melt electrowriting (MEW) has been developed as a technique able to fabricate cell-supporting scaffolds with precise micro pore sizes via predictable fibre deposition. The effect of the scaffold's architecture on cellular gene expression however has not been fully elucidated. METHODS The design and fabrication of three different uniform pore structures (250, 500 and 750 μm), as well as two offset scaffolds with different layout of fibres (30 and 50%) and one complex scaffold with three gradient pore sizes of 250-500 - 750 μm, was performed by using MEW. Calcium phosphate modification was applied to enhance the PCL scaffold hydrophilicity and bone inductivity prior to seeding with osteoblasts which were then maintained in culture for up to 30 days. Over this time, osteoblast cell morphology, matrix mineralisation, osteogenic gene expression and collagen production were assessed. RESULTS The in vitro findings revealed that the gradient scaffold significantly increased alkaline phosphatase activity in the attached osteoblasts while matrix mineralization was higher in the 50% offset scaffolds. The expression of osteocalcin and osteopontin genes were also upregulated compared to other osteogenic genes following 30 days culture, particularly in offset and gradient scaffold structures. Immunostaining showed significant expression of osteocalcin in offset and gradient scaffold structures. CONCLUSIONS This study demonstrated that the heterogenous pore sizes in gradient and fibre offset PCL scaffolds prepared using MEW significantly improved the osteogenic potential of osteoblasts and hence may provide superior outcomes in bone regeneration applications.
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Affiliation(s)
- Naghmeh Abbasi
- School of Dentistry and Oral Health, Griffith University, Gold Coast Campus, Southport, Queensland 4215 Australia
- Menzies Health Institute Queensland, Griffith University, Gold Coast Campus, Southport, Queensland 4215 Australia
| | - Saso Ivanovski
- School of Dentistry, University of Queensland, Herston Campus, St Lucia, Queensland 4072 Australia
| | - Karan Gulati
- School of Dentistry, University of Queensland, Herston Campus, St Lucia, Queensland 4072 Australia
| | - Robert M. Love
- School of Dentistry and Oral Health, Griffith University, Gold Coast Campus, Southport, Queensland 4215 Australia
| | - Stephen Hamlet
- School of Dentistry and Oral Health, Griffith University, Gold Coast Campus, Southport, Queensland 4215 Australia
- Menzies Health Institute Queensland, Griffith University, Gold Coast Campus, Southport, Queensland 4215 Australia
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29
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Metz C, Duda GN, Checa S. Towards multi-dynamic mechano-biological optimization of 3D-printed scaffolds to foster bone regeneration. Acta Biomater 2020; 101:117-127. [PMID: 31669697 DOI: 10.1016/j.actbio.2019.10.029] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2019] [Revised: 09/26/2019] [Accepted: 10/22/2019] [Indexed: 12/12/2022]
Abstract
Substantial tissue loss, such as in large bone defects, represents a clinical challenge for which regenerative therapies and tissue engineering strategies aim at offering treatment alternatives to conventional replacement approaches by metallic implants. 3D printing technologies provide endless opportunities to shape scaffold structures that could support endogenous regeneration. However, it remains unclear which of the numerous parameters at hand eventually enhance tissue regeneration. In the last decades, a significant effort has been made in the development of computer tools to optimize scaffold designs. Here, we aim at giving a more comprehensive overview summarizing current computer optimization framework technologies. We confront these with the most recent advances in scaffold mechano-biological optimization, discuss their limitations and provide suggestions for future development. We conclude that the field needs to move forward to not only optimize scaffolds to avoid implant failures but to improve their mechano-biological behaviour: providing an initial stimulus for fast tissue organisation and healing and accounting for remodelling, scaffold degradation and consecutive filling with host tissue. So far, modelling approaches fall short in including the various scales of tissue dynamics. With this review, we wish to stimulate a move towards multi-dynamic mechano-biological optimization of 3D-printed scaffolds. STATEMENT OF SIGNIFICANCE: Large bone defects represent a clinical challenge for which tissue engineering strategies aim at offering alternatives to conventional treatment strategies. 3D printing technologies provide endless opportunities to shape scaffold structures that could support endogenous regeneration. However, it remains unclear which of the numerous parameters at hand eventually enhance tissue regeneration. In the last decades, a significant effort has been made in the development of computer tools to optimize scaffold designs. This review summarizes current computer optimization frameworks and most recent advances in mechano-biological optimization of bone scaffolds to better stimulate bone regeneration. We wish to stimulate a move towards multi-dynamic mechano-biological optimization of 3D-printed scaffolds.
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Affiliation(s)
- Camille Metz
- Julius Wolff Institute, Charité - Universitätsmedizin Berlin, Augustenburger Platz 1, 13353 Berlin, Germany; Berlin-Brandenburg School for Regenerative Therapies, Berlin, Germany; MINES ParisTech - PSL Research University, Paris, France
| | - Georg N Duda
- Julius Wolff Institute, Charité - Universitätsmedizin Berlin, Augustenburger Platz 1, 13353 Berlin, Germany; Berlin-Brandenburg School for Regenerative Therapies, Berlin, Germany
| | - Sara Checa
- Julius Wolff Institute, Charité - Universitätsmedizin Berlin, Augustenburger Platz 1, 13353 Berlin, Germany; Berlin-Brandenburg School for Regenerative Therapies, Berlin, Germany.
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30
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Soufivand AA, Abolfathi N, Hashemi A, Lee SJ. The effect of 3D printing on the morphological and mechanical properties of polycaprolactone filament and scaffold. POLYM ADVAN TECHNOL 2019. [DOI: 10.1002/pat.4838] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Anahita Ahmadi Soufivand
- Biomechanical Engineering Group, Biomedical Engineering DepartmentAmirkabir University of Technology 424 Hafez Ave, Tehran Iran
| | - Nabiollah Abolfathi
- Biomechanical Engineering Group, Biomedical Engineering DepartmentAmirkabir University of Technology 424 Hafez Ave, Tehran Iran
| | - Ata Hashemi
- Biomechanical Engineering Group, Biomedical Engineering DepartmentAmirkabir University of Technology 424 Hafez Ave, Tehran Iran
| | - Sang Jin Lee
- Wake Forest Institute for Regenerative MedicineWake Forest School of Medicine, Medical Center Boulevard Winston‐Salem NC
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31
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Cheong VS, Fromme P, Coathup MJ, Mumith A, Blunn GW. Partial Bone Formation in Additive Manufactured Porous Implants Reduces Predicted Stress and Danger of Fatigue Failure. Ann Biomed Eng 2019; 48:502-514. [PMID: 31549330 PMCID: PMC6928091 DOI: 10.1007/s10439-019-02369-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Accepted: 09/14/2019] [Indexed: 11/25/2022]
Abstract
New porous implant designs made possible by additive manufacturing allow for increased osseointegration, potentially improving implant performance and longevity for patients that require massive bone implants. The aim of this study was to evaluate how implantation and the strain distribution in the implant affect the pattern of bone ingrowth and how changes in tissue density within the pores alter the stresses in implants. The hypothesis was that porous metal implants are susceptible to fatigue failure, and that this reduces as osteointegration occurs. A phenomenological, finite element analysis (FEA) bone remodelling model was used to predict partial bone formation for two porous (pore sizes of 700 μm and 1500 μm), laser sintered Ti6Al4V implants in an ovine condylar defect model, and was compared and verified against in vivo, histology results. The FEA models predicted partial bone formation within the porous implants, but over-estimated the amount of bone-surface area compared to histology results. The stress and strain in the implant and adjacent tissues were assessed before, during bone remodelling, and at equilibrium. Results showed that partial bone formation improves the stress distribution locally by reducing stress concentrations for both pore sizes, by at least 20%. This improves the long-term fatigue resistance for the larger pore implant, as excessively high stress is reduced to safer levels (86% of fatigue strength) as bone forms. The stress distribution only changed slightly in regions without bone growth. As the extent of bone formation into extensively porous bone implants depends on the level of stress shielding, the design of the implant and stiffness have significant influence on bone integration and need to be considered carefully to ensure the safety of implants with substantial porous regions. To our knowledge this is the first time that the effect of bone formation on stress distribution within a porous implant has been described and characterised.
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Affiliation(s)
- Vee San Cheong
- John Scales Centre for Biomedical Engineering, Institute of Orthopaedics and Musculoskeletal Science, Royal National Orthopaedics Hospital, University College London, Stanmore, HA7 4LP, UK
- Department of Mechanical Engineering, University College London, London, WC1E 7JE, UK
| | - Paul Fromme
- Department of Mechanical Engineering, University College London, London, WC1E 7JE, UK.
| | - Melanie J Coathup
- John Scales Centre for Biomedical Engineering, Institute of Orthopaedics and Musculoskeletal Science, Royal National Orthopaedics Hospital, University College London, Stanmore, HA7 4LP, UK
- College of Medicine, University of Central Florida, Orlando, FL, 32827-08, USA
| | - Aadil Mumith
- John Scales Centre for Biomedical Engineering, Institute of Orthopaedics and Musculoskeletal Science, Royal National Orthopaedics Hospital, University College London, Stanmore, HA7 4LP, UK
| | - Gordon W Blunn
- John Scales Centre for Biomedical Engineering, Institute of Orthopaedics and Musculoskeletal Science, Royal National Orthopaedics Hospital, University College London, Stanmore, HA7 4LP, UK
- School of Pharmacy and Biomedical Sciences, University of Portsmouth, Portsmouth, PO1 2DT, UK
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32
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Rodríguez-Montaño ÓL, Cortés-Rodríguez CJ, Naddeo F, Uva AE, Fiorentino M, Naddeo A, Cappetti N, Gattullo M, Monno G, Boccaccio A. Irregular Load Adapted Scaffold Optimization: A Computational Framework Based on Mechanobiological Criteria. ACS Biomater Sci Eng 2019; 5:5392-5411. [DOI: 10.1021/acsbiomaterials.9b01023] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Óscar L. Rodríguez-Montaño
- Departamento de Ingeniería Mecánica y Mecatrónica, Universidad Nacional de Colombia, Carrera 30 No. 45-03, Bogotá D.C., Colombia
- Dipartimento di Meccanica, Matematica e Management, Politecnico di Bari, Viale Japigia, 182, 70126 Bari, Italy
| | - Carlos Julio Cortés-Rodríguez
- Departamento de Ingeniería Mecánica y Mecatrónica, Universidad Nacional de Colombia, Carrera 30 No. 45-03, Bogotá D.C., Colombia
| | - Francesco Naddeo
- Dipartimento di Ingegneria Industriale, Università di Salerno, via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy
| | - Antonio E. Uva
- Dipartimento di Meccanica, Matematica e Management, Politecnico di Bari, Viale Japigia, 182, 70126 Bari, Italy
| | - Michele Fiorentino
- Dipartimento di Meccanica, Matematica e Management, Politecnico di Bari, Viale Japigia, 182, 70126 Bari, Italy
| | - Alessandro Naddeo
- Dipartimento di Ingegneria Industriale, Università di Salerno, via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy
| | - Nicola Cappetti
- Dipartimento di Ingegneria Industriale, Università di Salerno, via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy
| | - Michele Gattullo
- Dipartimento di Meccanica, Matematica e Management, Politecnico di Bari, Viale Japigia, 182, 70126 Bari, Italy
| | - Giuseppe Monno
- Dipartimento di Meccanica, Matematica e Management, Politecnico di Bari, Viale Japigia, 182, 70126 Bari, Italy
| | - Antonio Boccaccio
- Dipartimento di Meccanica, Matematica e Management, Politecnico di Bari, Viale Japigia, 182, 70126 Bari, Italy
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Modeling, Assessment, and Design of Porous Cells Based on Schwartz Primitive Surface for Bone Scaffolds. ScientificWorldJournal 2019; 2019:7060847. [PMID: 31346324 PMCID: PMC6620862 DOI: 10.1155/2019/7060847] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 06/04/2019] [Accepted: 06/11/2019] [Indexed: 11/18/2022] Open
Abstract
The design of bone scaffolds for tissue regeneration is a topic of great interest, which involves different issues related to geometry of architectures, mechanical behavior, and biological requirements, whose optimal combination determines the success of an implant. Additive manufacturing (AM) has widened the capability to produce structures with complex geometries, which should potentially satisfy the different requirements. These architectures can be obtained by means of refined methods and have to be assessed in terms of geometrical and mechanical properties. In this paper a triply periodic minimal surface (TPMS), the Schwarz's Primitive surface (P-surface), has been considered as scaffold unit cell and conveniently parameterized in order to investigate the effect of modulation of analytical parameters on the P-cell geometry and on its properties. Several are the cell properties, which can affect the scaffold performance. Due to the important biofunctional role that the surface curvature plays in mechanisms of cellular proliferation and differentiation, in this paper, in addition to properties considering the cell geometry in its whole (such as volume fraction or pore size), new properties were proposed. These properties involve, particularly, the evaluation of local geometrical-differential properties of the P-surface. The results of this P-cell comprehensive characterization are very useful for the design of customized bone scaffolds able to satisfy both biological and mechanical requirements. A numerical structural evaluation, by means of finite element method (FEM), was performed in order to assess the stiffness of solid P-cells as a function of the changes of the analytical parameters of outer surface and the thickness of cell. Finally, the relationship between stiffness and porosity has been analyzed, given the relevance that this property has for bone scaffolds design.
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34
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Egan PF. Integrated Design Approaches for 3D Printed Tissue Scaffolds: Review and Outlook. MATERIALS (BASEL, SWITZERLAND) 2019; 12:E2355. [PMID: 31344956 PMCID: PMC6695904 DOI: 10.3390/ma12152355] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2019] [Revised: 07/17/2019] [Accepted: 07/20/2019] [Indexed: 01/16/2023]
Abstract
Emerging 3D printing technologies are enabling the fabrication of complex scaffold structures for diverse medical applications. 3D printing allows controlled material placement for configuring porous tissue scaffolds with tailored properties for desired mechanical stiffness, nutrient transport, and biological growth. However, tuning tissue scaffold functionality requires navigation of a complex design space with numerous trade-offs that require multidisciplinary assessment. Integrated design approaches that encourage iteration and consideration of diverse processes including design configuration, material selection, and simulation models provide a basis for improving design performance. In this review, recent advances in design, fabrication, and assessment of 3D printed tissue scaffolds are investigated with a focus on bone tissue engineering. Bone healing and fusion are examples that demonstrate the needs of integrated design approaches in leveraging new materials and 3D printing processes for specified clinical applications. Current challenges for integrated design are outlined and emphasize directions where new research may lead to significant improvements in personalized medicine and emerging areas in healthcare.
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Affiliation(s)
- Paul F Egan
- Texas Tech University, 2500 Broadway, Lubbock, TX 79409, USA.
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35
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Abbasi N, Abdal-hay A, Hamlet S, Graham E, Ivanovski S. Effects of Gradient and Offset Architectures on the Mechanical and Biological Properties of 3-D Melt Electrowritten (MEW) Scaffolds. ACS Biomater Sci Eng 2019; 5:3448-3461. [DOI: 10.1021/acsbiomaterials.8b01456] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
| | - Abdalla Abdal-hay
- School of Dentistry, University of Queensland, Herston Campus, St Lucia, Queensland 4072, Australia
- Department of Engineering Materials and Mechanical Design, Faculty of Engineering, South Valley University, Qena, 83523, Egypt
| | | | - Elizabeth Graham
- Central Analytical Research Facility, Queensland University of Technology, Gardens Point Campus, Brisbane City, Queensland 4000, Australia
| | - Saso Ivanovski
- School of Dentistry, University of Queensland, Herston Campus, St Lucia, Queensland 4072, Australia
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36
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Olofsson S, Mehrian M, Calandra R, Geris L, Deisenroth MP, Misener R. Bayesian Multiobjective Optimisation With Mixed Analytical and Black-Box Functions: Application to Tissue Engineering. IEEE Trans Biomed Eng 2019; 66:727-739. [DOI: 10.1109/tbme.2018.2855404] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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37
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Koh YG, Lee JA, Kim YS, Lee HY, Kim HJ, Kang KT. Optimal mechanical properties of a scaffold for cartilage regeneration using finite element analysis. J Tissue Eng 2019; 10:2041731419832133. [PMID: 30834102 PMCID: PMC6396049 DOI: 10.1177/2041731419832133] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Accepted: 01/29/2019] [Indexed: 12/15/2022] Open
Abstract
The development of successful scaffolds for bone tissue engineering requires concurrent engineering that combines different research fields. In previous studies, phenomenological computational models predicted the mechanical properties of a scaffold in a simple loading condition using the mechano-regulation theory. Therefore, the aim of this study is to predict the mechanical properties of an optimum scaffold required for cartilage regeneration using three-dimensional knee joint developed from medical imaging and mechano-regulation theory. It was predicted that the scaffold with optimal mechanical properties would result in greater amounts of cartilage tissue formation than without a scaffold. The results demonstrated the ability of the algorithms to design optimized scaffolds with target properties and confirmed the applicability of set techniques for bone tissue engineering. The scaffolds were optimized to suit the site-specific loading requirements, and the results reveal a new approach for computational simulations in tissue engineering.
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Affiliation(s)
- Yong-Gon Koh
- Joint Reconstruction Center, Department of Orthopaedic Surgery, Yonsei Sarang Hospital, Seoul, Republic of Korea
| | - Jin-Ah Lee
- Department of Mechanical Engineering, Yonsei University, Seoul, Republic of Korea
| | - Yong Sang Kim
- Joint Reconstruction Center, Department of Orthopaedic Surgery, Yonsei Sarang Hospital, Seoul, Republic of Korea
| | - Hwa Yong Lee
- Department of Mechanical Engineering, Yonsei University, Seoul, Republic of Korea
| | - Hyo Jeong Kim
- Department of Sport and Healthy Aging, Korea National Sport University, Seoul, Republic of Korea
| | - Kyoung-Tak Kang
- Department of Mechanical Engineering, Yonsei University, Seoul, Republic of Korea
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38
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Zhang XY, Fang G, Leeflang S, Zadpoor AA, Zhou J. Topological design, permeability and mechanical behavior of additively manufactured functionally graded porous metallic biomaterials. Acta Biomater 2019; 84:437-452. [PMID: 30537537 DOI: 10.1016/j.actbio.2018.12.013] [Citation(s) in RCA: 67] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Revised: 11/08/2018] [Accepted: 12/07/2018] [Indexed: 11/26/2022]
Abstract
Recent advances in additive manufacturing (AM) have enabled the fabrication of functionally graded porous biomaterials (FGPBs) for application as orthopedic implants and bone substitutes. Here, we present a step-wise topological design of FGPB based on diamond unit cells to mimic the structure of the femoral diaphysis. The FGPB was manufactured from Ti-6Al-4V powder using the selective laser melting (SLM) technique. The morphological parameters, permeability and mechanical properties of FGPB samples were measured and compared with those of the biomaterials with uniform porous structures based on the same type of the unit cell. The FGPB exhibited a low density (1.9 g/cm3), a moderate Young's modulus (10.44 GPa), a high yield stress (170.6 MPa), a high maximum stress (201 MPa) and favorable ductility, being superior to the biomaterials with uniform porous structures in comprehensive mechanical properties. In addition, digital image correlation (DIC) and finite element (FE) simulation were used to unravel the mechanisms governing the deformation and yielding behavior of these biomaterials particularly at the strut junctions. Both DIC and FE simulations confirmed that the deformation and yielding of the FGPB occurred largely in the load-bearing layers but not at the interfaces between layers. Defect-coupled FE models based on solid elements provided further insights into the mechanical responses of the FGPB to compressive loads at both macro- and micro-scales. With the defect-coupled representative volume element model for the FGPB, the Young's modulus and yield stress of the FGPBs were predicted with less than 2% deviations from the experimental data. The study clearly demonstrated the capabilities of combined experimental and computational methods to resolve the uncertainties of the mechanical behavior of FGPBs, which would open up the possibilities of applying various porosity variation strategies for the design of biomimetic AM porous biomaterials. STATEMENT OF SIGNIFICANCE: Functionally graded bone scaffolds significantly promote the recovery of segmental bone defect. In the present study, we present a step-wise topological design of functionally graded porous biomaterial (FGPB) to mimic the structure of the femoral diaphysis. The Ti-6Al-4V FGPB exhibited a superior combination of low density, moderate Young's modulus, high yield stress and maximum stress as well as favorable ductility. The biomechanical performance of FGPB was studied in both macro and micro perspectives. The defect-coupled model revealed the significant yielding in the load-bearing parts and the Young's modulus and yield stress of the FGPBs were predicted with less than 2% deviations from the experimental data. The superiority of combined experimental and computational methods has been confirmed.
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39
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Wyatt H, Safar A, Clarke A, Evans SL, Mihai LA. Nonlinear scaling effects in the stiffness of soft cellular structures. ROYAL SOCIETY OPEN SCIENCE 2019; 6:181361. [PMID: 30800383 PMCID: PMC6366230 DOI: 10.1098/rsos.181361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Accepted: 12/05/2018] [Indexed: 06/09/2023]
Abstract
For cellular structures with uniform geometry, cell size and distribution, made from a neo-Hookean material, we demonstrate experimentally that large stretching causes nonlinear scaling effects governed by the microstructural architecture and the large strains at the cell level, which are not predicted by the linear elastic theory. For this purpose, three honeycomb-like structures with uniform square cells in stacked distribution were designed, where the number of cells varied, while the material volume and the ratio between the thickness and the length of the cell walls were fixed. These structures were manufactured from silicone rubber and tested under large uniaxial tension in a bespoke test fixture. Optical strain measurements were used to assess the deformation by capturing both the global displacements of the structure and the local deformations in the form of a strain map. The experimental results showed that, under sufficiently large strains, there was an increase in the stiffness of the structure when the same volume of material was arranged as many small cells compared to when it was organized as fewer larger cells. Finite element simulations confirmed our experimental findings. This study sheds light upon the nonlinear elastic responses of cellular structures in large-strain deformations, which cannot be captured within the linear elasticity framework.
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Affiliation(s)
- Hayley Wyatt
- School of Engineering, Cardiff University, The Parade, Cardiff CF24 3AA, UK
| | - Alexander Safar
- School of Mathematics, Cardiff University, Senghennydd Road, Cardiff CF24 4AG, UK
| | - Alastair Clarke
- School of Engineering, Cardiff University, The Parade, Cardiff CF24 3AA, UK
| | - Sam L. Evans
- School of Engineering, Cardiff University, The Parade, Cardiff CF24 3AA, UK
| | - L. Angela Mihai
- School of Mathematics, Cardiff University, Senghennydd Road, Cardiff CF24 4AG, UK
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40
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He W, Fan Y, Li X. [Recent research progress of bioactivity mechanism and application of bone repair materials]. ZHONGGUO XIU FU CHONG JIAN WAI KE ZA ZHI = ZHONGGUO XIUFU CHONGJIAN WAIKE ZAZHI = CHINESE JOURNAL OF REPARATIVE AND RECONSTRUCTIVE SURGERY 2018; 32:1107-1115. [PMID: 30129343 DOI: 10.7507/1002-1892.201807039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Large bone defect repair is a difficult problem to be solved urgently in orthopaedic field, and the application of bone repair materials is a feasible method to solve this problem. Therefore, bone repair materials have been continuously developed, and have evolved from autogenous bone grafts, allograft bone grafts, and inert materials to highly active and multifunctional bone tissue engineering scaffold materials. In this paper, the related mechanism of bone repair materials, the application of bone repair materials, and the exploration of new bone repair materials are introduced to present the research status and advance of the bone repair materials, and the development direction is also prospected.
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Affiliation(s)
- Wei He
- School of Biological Science and Medical Engineering, Beihang University, Beijing, 100083, P.R.China;Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, 100083, P.R.China
| | - Yubo Fan
- School of Biological Science and Medical Engineering, Beihang University, Beijing, 100083, P.R.China;Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, 100083,
| | - Xiaoming Li
- School of Biological Science and Medical Engineering, Beihang University, Beijing, 100083, P.R.China;Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, 100083,
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41
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Zhang S, Vijayavenkataraman S, Lu WF, Fuh JYH. A review on the use of computational methods to characterize, design, and optimize tissue engineering scaffolds, with a potential in 3D printing fabrication. J Biomed Mater Res B Appl Biomater 2018; 107:1329-1351. [DOI: 10.1002/jbm.b.34226] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Revised: 07/26/2018] [Accepted: 08/12/2018] [Indexed: 12/13/2022]
Affiliation(s)
- Shuo Zhang
- Department of Mechanical EngineeringNational University of Singapore, 9 Engineering Drive 1 Singapore 117576 Singapore
| | - Sanjairaj Vijayavenkataraman
- Department of Mechanical EngineeringNational University of Singapore, 9 Engineering Drive 1 Singapore 117576 Singapore
| | - Wen Feng Lu
- Department of Mechanical EngineeringNational University of Singapore, 9 Engineering Drive 1 Singapore 117576 Singapore
| | - Jerry Y H Fuh
- Department of Mechanical EngineeringNational University of Singapore, 9 Engineering Drive 1 Singapore 117576 Singapore
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42
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Permeability and fluid flow-induced wall shear stress of bone tissue scaffolds: Computational fluid dynamic analysis using Newtonian and non-Newtonian blood flow models. Comput Biol Med 2018; 99:201-208. [DOI: 10.1016/j.compbiomed.2018.06.017] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Revised: 06/02/2018] [Accepted: 06/18/2018] [Indexed: 12/17/2022]
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43
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Comparison of the mechanobiological performance of bone tissue scaffolds based on different unit cell geometries. J Mech Behav Biomed Mater 2018; 83:28-45. [DOI: 10.1016/j.jmbbm.2018.04.008] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Revised: 04/05/2018] [Accepted: 04/09/2018] [Indexed: 12/13/2022]
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44
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Simulated tissue growth for 3D printed scaffolds. Biomech Model Mechanobiol 2018; 17:1481-1495. [DOI: 10.1007/s10237-018-1040-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2017] [Accepted: 05/28/2018] [Indexed: 10/14/2022]
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45
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Computational simulations and experimental validation of structure- physicochemical properties of pristine and functionalized graphene: Implications for adverse effects on p53 mediated DNA damage response. Int J Biol Macromol 2018; 110:540-549. [DOI: 10.1016/j.ijbiomac.2017.10.106] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Revised: 10/07/2017] [Accepted: 10/16/2017] [Indexed: 01/11/2023]
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46
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Rhombicuboctahedron unit cell based scaffolds for bone regeneration: geometry optimization with a mechanobiology – driven algorithm. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2018; 83:51-66. [DOI: 10.1016/j.msec.2017.09.004] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Revised: 07/18/2017] [Accepted: 09/27/2017] [Indexed: 12/28/2022]
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47
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Geometric Modeling of Cellular Materials for Additive Manufacturing in Biomedical Field: A Review. Appl Bionics Biomech 2018; 2018:1654782. [PMID: 29487626 PMCID: PMC5816891 DOI: 10.1155/2018/1654782] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Accepted: 10/26/2017] [Indexed: 02/07/2023] Open
Abstract
Advances in additive manufacturing technologies facilitate the fabrication of cellular materials that have tailored functional characteristics. The application of solid freeform fabrication techniques is especially exploited in designing scaffolds for tissue engineering. In this review, firstly, a classification of cellular materials from a geometric point of view is proposed; then, the main approaches on geometric modeling of cellular materials are discussed. Finally, an investigation on porous scaffolds fabricated by additive manufacturing technologies is pointed out. Perspectives in geometric modeling of scaffolds for tissue engineering are also proposed.
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48
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Boccaccio A, Uva AE, Fiorentino M, Monno G, Ballini A, Desiate A. Optimal Load for Bone Tissue Scaffolds with an Assigned Geometry. Int J Med Sci 2018; 15:16-22. [PMID: 29333083 PMCID: PMC5765735 DOI: 10.7150/ijms.20522] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Accepted: 07/24/2017] [Indexed: 01/21/2023] Open
Abstract
Thanks to the recent advances of three-dimensional printing technologies the design and the fabrication of a large variety of scaffold geometries was made possible. The surgeon has the availability of a wide number of scaffold micro-architectures thus needing adequate guidelines for the choice of the best one to be implanted in a patient-specific anatomic region. We propose a mechanobiology-based optimization algorithm capable of determining, for bone tissue scaffolds with an assigned geometry, the optimal value Lopt of the compression load to which they should be subjected, i.e. the load value for which the formation of the largest amounts of bone is favoured and hence the successful outcome of the scaffold implantation procedure is guaranteed. Scaffolds based on hexahedron unit cells were investigated including pores differently dimensioned and with different shapes such as elliptic or rectangular. The algorithm predicted decreasing values of the optimal load for scaffolds with pores with increasing dimensions. The optimal values predicted for the scaffolds with elliptic pores were found higher than those with rectangular ones. The proposed algorithm can be utilized to properly guide the surgeon in the choice of the best scaffold type/geometry that better satisfies the specific patient requirements.
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Affiliation(s)
- Antonio Boccaccio
- Department of Mechanics, Mathematics and Management, Politecnico di Bari, Bari 70126, Italy
| | - Antonio E Uva
- Department of Mechanics, Mathematics and Management, Politecnico di Bari, Bari 70126, Italy
| | - Michele Fiorentino
- Department of Mechanics, Mathematics and Management, Politecnico di Bari, Bari 70126, Italy
| | - Giuseppe Monno
- Department of Mechanics, Mathematics and Management, Politecnico di Bari, Bari 70126, Italy
| | - Andrea Ballini
- Department of Base Medical Sciences, Neurosciences and Sense Organs, University of Bari "Aldo Moro", Bari, Italy
| | - Apollonia Desiate
- Interdisciplinary Department of Medicine, Section of Dentistry, School of Medicine, University of Bari "Aldo Moro", Bari, Italy
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49
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Process System Engineering Methodologies Applied to Tissue Development and Regenerative Medicine. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018; 1078:445-463. [PMID: 30357637 DOI: 10.1007/978-981-13-0950-2_23] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Tissue engineering and the manufacturing of regenerative medicine products demand strict control over the production process and product quality monitoring. In this chapter, the application of process systems engineering (PSE) approaches in the production of cell-based products has been discussed. Mechanistic, empirical, continuum and discrete models are compared and their use in describing cellular phenomena is reviewed. In addition, model-based optimization strategies employed in the field of tissue engineering and regenerative medicine are discussed. An introduction to process control theory is given and the main applications of classical and advanced methods in cellular production processes are described. Finally, new nondestructive and noninvasive monitoring techniques have been reviewed, focusing on large-scale manufacturing systems for cell-based constructs and therapeutic products. The application of the PSE methodologies presented here offers a promising alternative to overcome the main challenges in manufacturing engineered tissue and regeneration products.
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50
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Dental-Derived Stem Cells and Their Secretome and Interactions with Bioscaffolds/Biomaterials in Regenerative Medicine: From the In Vitro Research to Translational Applications. Stem Cells Int 2017; 2017:6975251. [PMID: 29445404 PMCID: PMC5763215 DOI: 10.1155/2017/6975251] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2017] [Accepted: 11/20/2017] [Indexed: 01/04/2023] Open
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