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Lim HK, Ryu M, Woo SH, Song IS, Choi YJ, Lee UL. Bone Conduction Capacity of Highly Porous 3D-Printed Titanium Scaffolds Based on Different Pore Designs. Materials (Basel) 2021; 14:3892. [PMID: 34300810 DOI: 10.3390/ma14143892] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Revised: 07/08/2021] [Accepted: 07/09/2021] [Indexed: 11/17/2022]
Abstract
In porous titanium scaffolds manufactured via 3D printing, the differences in bone formation according to pore design and implantation period were studied. Titanium scaffolds with three types of different pore structures (Octadense, Gyroid, and Dode) were fabricated via 3D printing using the selective laser melting method. Mechanical properties of scaffolds were investigated. Prepared specimens were inserted into both femurs of nine rabbits and their clinical characteristics were observed. Three animals were sacrificed at the 2nd, 4th, and 6th weeks, and the differences in bone formation were radiologically and histologically analyzed. The percentage of new bone and surface density in the pore structure were observed to be approximately 25% and 8 mm2/mm3, respectively. There was no difference in the amount of newly formed bone according to the pore design at 2, 4, and 6 weeks. In addition, no differences in the amount of newly formed bone were observed with increasing time within the same pore design for all three designs. During the 6-week observation period, the proportion of new bones in the 3D-printed titanium scaffold was approximately 25%. Differences in bone formation according to the pore design or implantation period were not observed.
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Yao QQ, Hu J, Zheng PF, Li JY, Zhou J, Tian SC, Wei B, Xu Y, Wang LM. In vitro evaluation of marrow clot enrichment on microstructure decoration, cell delivery and proliferation of porous titanium scaffolds by selective laser melting three-dimensional printing. J Biomed Mater Res B Appl Biomater 2017; 106:2245-2253. [PMID: 29083526 DOI: 10.1002/jbm.b.34032] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Revised: 09/09/2017] [Accepted: 09/24/2017] [Indexed: 12/26/2022]
Abstract
Titanium alloy is a clinically approved material for bone substitution. Although three-dimensional printing (3DP) fabrication technique can build up porous Ti scaffolds with the designed shape and microstructure, the biomechanical performance of 3DP Ti scaffolds still need to be improved to increase the reliability of osseointegration capacity. To address this issue, rabbit bone marrow clot (MC) is used to modify 3DP Ti scaffolds by stem cell delivery and microenvironment decoration inside the pores of these scaffolds. Moreover, 3DP Ti scaffolds were built up using selective laser melting, and 3DP MC-Ti scaffolds were constructed through the enrichment of MC with Ti scaffolds in vitro. Results demonstrated that the obtained 3DP Ti scaffolds in current study has an average modulus of elasticity (ME) at 1294.48 MPa with average yield strength of 33.154 MPa. For MC-Ti scaffolds, MC enrichment obstructs the pores of 3DP scaffolds due to the large amount of fibrin and erythrocytes and leads to a decrease in ratio of live cells at 1-week culture. Cell proliferation and osteogenic differentiation performance of MC-Ti scaffolds were promoted with porous recanalization in the later 3 weeks. After 2 weeks in vitro culture, fivefold of cell number in MC-Ti scaffolds were observed than bone marrow-derived mesenchymal stem cell-seeded Ti scaffolds. Compared to Ti scaffolds, fourfold of deoxyribonucleic acid content, type I collagen-α1, osteocalcin, and alkaline phosphatase expression in MC-Ti scaffolds were observed after 4 weeks in vitro culture. Results suggested that the combination with MC is a highly efficient method that improves the biological performance of Ti scaffolds. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 2245-2253, 2018.
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Affiliation(s)
- Qing-Qiang Yao
- Department of Orthopaedic surgery, Nanjing First Hospital, Nanjing Medical University, Nanjing, China.,Key Lab of Biomaterial and Additive Manufacturing Research, Institute of Digital Medicine, Nanjing Medical University, Nanjing, China.,Clinical Orthopaedic Medical Center of Nanjing Metro, Nanjing First Hospital, Nanjing, China
| | - Jun Hu
- Department of Orthopaedic surgery, Nanjing First Hospital, Nanjing Medical University, Nanjing, China.,Key Lab of Biomaterial and Additive Manufacturing Research, Institute of Digital Medicine, Nanjing Medical University, Nanjing, China
| | - Peng-Fei Zheng
- Department of Orthopaedic surgery, Nanjing First Hospital, Nanjing Medical University, Nanjing, China.,Key Lab of Biomaterial and Additive Manufacturing Research, Institute of Digital Medicine, Nanjing Medical University, Nanjing, China
| | - Jia-Yi Li
- Key Lab of Biomaterial and Additive Manufacturing Research, Institute of Digital Medicine, Nanjing Medical University, Nanjing, China.,Clinical Orthopaedic Medical Center of Nanjing Metro, Nanjing First Hospital, Nanjing, China
| | - Jin Zhou
- Department of Orthopaedic surgery, Nanjing First Hospital, Nanjing Medical University, Nanjing, China
| | - Shu-Chang Tian
- Department of Orthopaedic surgery, Nanjing First Hospital, Nanjing Medical University, Nanjing, China
| | - Bo Wei
- Department of Orthopaedic surgery, Nanjing First Hospital, Nanjing Medical University, Nanjing, China.,Key Lab of Biomaterial and Additive Manufacturing Research, Institute of Digital Medicine, Nanjing Medical University, Nanjing, China
| | - Yan Xu
- Key Lab of Biomaterial and Additive Manufacturing Research, Institute of Digital Medicine, Nanjing Medical University, Nanjing, China.,Clinical Orthopaedic Medical Center of Nanjing Metro, Nanjing First Hospital, Nanjing, China
| | - Li-Ming Wang
- Department of Orthopaedic surgery, Nanjing First Hospital, Nanjing Medical University, Nanjing, China.,Key Lab of Biomaterial and Additive Manufacturing Research, Institute of Digital Medicine, Nanjing Medical University, Nanjing, China.,Clinical Orthopaedic Medical Center of Nanjing Metro, Nanjing First Hospital, Nanjing, China
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