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Moreira AC, Fernandes CP, Oliveira MVD, Duailibi MT, Ribeiro AA, Duailibi SE, Kfouri FDÁ, Mantovani IF. The effect of pores and connections geometries on bone ingrowth into titanium scaffolds: an assessment based on 3D microCT images. Biomed Mater 2021; 16. [PMID: 34492651 DOI: 10.1088/1748-605x/ac246b] [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: 04/19/2021] [Accepted: 09/07/2021] [Indexed: 11/11/2022]
Abstract
In order to support bone tissue regeneration, porous biomaterial implants (scaffolds) must offer chemical and mechanical properties, besides favorable fluid transport. Titanium implants provide these requirements, and depending on their microstructural parameters, the osteointegration process can be stimulated. The pore structure of scaffolds plays an essential role in this process, guiding fluid transport for neo-bone regeneration. The objective of this work was to analyze geometric and morphologic parameters of the porous microstructure of implants and analyze their influences in the bone regeneration process, and then discuss which parameters are the most fundamental. Bone ingrowths into two different sorts of porous titanium implants were analyzed after 7, 14, 21, 28, and 35 incubation days in experimental animal models. Measurements were accomplished with x-ray microtomography image analysis from rabbit tibiae, applying a pore-network technique. Taking into account the most favorable pore sizes for neo-bone regeneration, a novel approach was employed to assess the influence of the pore structure on this process: the analyses were carried out considering minimum pore and connection sizes. With this technique, pores and connections were analyzed separately and the influence of connectivity was deeply evaluated. This investigation showed a considerable influence of the size of connections on the permeability parameter and consequently on the neo-bone regeneration. The results indicate that the processing of porous scaffolds must be focused on deliver pore connections that stimulate the transport of fluids throughout the implant to be applied as a bone replacer.
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Affiliation(s)
- Anderson Camargo Moreira
- Department of Mechanical Engineering (EMC/PGMAT), Federal University of Santa Catarina (UFSC), Laboratory of Porous Media and Thermophysical Properties (LMPT), Florianópolis, Brazil
| | - Celso Peres Fernandes
- Department of Mechanical Engineering (EMC/PGMAT), Federal University of Santa Catarina (UFSC), Laboratory of Porous Media and Thermophysical Properties (LMPT), Florianópolis, Brazil
| | - Marize Varella de Oliveira
- Laboratory of Powder Technology, Division of Materials, National Institute of Technology, Rio de Janeiro, Brazil
| | - Monica Talarico Duailibi
- Tissue Engineering and Biofabrication Lab, Cellular and Molecular Technology Center, Federal University of São Paulo, CTCMol-UNIFESP, São Paulo, Brazil
| | - Alexandre Antunes Ribeiro
- Laboratory of Powder Technology, Division of Materials, National Institute of Technology, Rio de Janeiro, Brazil
| | - Silvio Eduardo Duailibi
- Tissue Engineering and Biofabrication Lab, Cellular and Molecular Technology Center, Federal University of São Paulo, CTCMol-UNIFESP, São Paulo, Brazil
| | - Flávio de Ávila Kfouri
- Tissue Engineering and Biofabrication Lab, Cellular and Molecular Technology Center, Federal University of São Paulo, CTCMol-UNIFESP, São Paulo, Brazil
| | - Iara Frangiotti Mantovani
- Department of Mechanical Engineering (EMC/PGMAT), Federal University of Santa Catarina (UFSC), Laboratory of Porous Media and Thermophysical Properties (LMPT), Florianópolis, Brazil
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Wang S, Suhaimi H, Mabrouk M, Georgiadou S, Ward JP, Das DB. Effects of Scaffold Pore Morphologies on Glucose Transport Limitations in Hollow Fibre Membrane Bioreactor for Bone Tissue Engineering: Experiments and Numerical Modelling. MEMBRANES 2021; 11:membranes11040257. [PMID: 33918241 PMCID: PMC8065773 DOI: 10.3390/membranes11040257] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/20/2021] [Revised: 03/30/2021] [Accepted: 03/31/2021] [Indexed: 12/11/2022]
Abstract
In the current research, three electrospun polycaprolactone (PCL) scaffolds with different pore morphology induced by changing the electrospinning parameters, spinning time and rate, have been prepared in order to provide a fundamental understanding on the effects pore morphology have on nutrient transport behaviour in hollow fibre membrane bioreactor (HFMB). After determining the porosity of the scaffolds, they were investigated for glucose diffusivity using cell culture media (CCM) and distilled water in a diffusion cell at 37 °C. The scanning electron microscope (SEM) images of the microstructure of the scaffolds were analysed further using ImageJ software to determine the porosity and glucose diffusivity. A Krogh cylinder model was used to determine the glucose transport profile with dimensionless variables within the HFMB. The paper discusses the roles of various dimensionless numbers (e.g., Péclet and Damköhler numbers) and non-dimensional groups of variables (e.g., non-dimensional fibre radius) on determining glucose concentration profiles, especially in the scaffold region. A negative linear relationship between glucose diffusivities across PCL scaffolds and the minimum glucose concentrations (i.e., concentration on the outer fibre edge on the outlet side (at z = 1 and r = 3.2) was also found. It was shown that the efficiency of glucose consumption improves with scaffolds of higher diffusivities. The results of this study are expected to help in optimizing designs of HFMB as well as carry out more accurate up scaling analyses for the bioreactor.
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Affiliation(s)
- Shuai Wang
- Department of Chemical Engineering, Loughborough University, Loughborough LE113TU, UK; (S.W.); (H.S.); (M.M.); (S.G.)
| | - Hazwani Suhaimi
- Department of Chemical Engineering, Loughborough University, Loughborough LE113TU, UK; (S.W.); (H.S.); (M.M.); (S.G.)
| | - Mostafa Mabrouk
- Department of Chemical Engineering, Loughborough University, Loughborough LE113TU, UK; (S.W.); (H.S.); (M.M.); (S.G.)
- Refractories, Ceramics and Building Materials Department, National Research Centre, 33El Bohouth St. (former EL Tahrir St.), Dokki, Giza P.O. Box 12622, Egypt
| | - Stella Georgiadou
- Department of Chemical Engineering, Loughborough University, Loughborough LE113TU, UK; (S.W.); (H.S.); (M.M.); (S.G.)
| | - John P. Ward
- Department of Mathematical Sciences, Loughborough University, Loughborough LE113TU, UK;
| | - Diganta B. Das
- Department of Chemical Engineering, Loughborough University, Loughborough LE113TU, UK; (S.W.); (H.S.); (M.M.); (S.G.)
- Correspondence: ; Tel.: +44-1-509-222-509
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Longhitano GA, Conde A, Arenas MA, Jardini AL, Zavaglia CADC, Maciel Filho R, de Damborenea JJ. Corrosion resistance improvement of additive manufactured scaffolds by anodizing. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2020.137423] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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