Development of a 95/5 poly(L-lactide-co-glycolide)/hydroxylapatite and β-tricalcium phosphate scaffold as bone replacement material via selective laser sintering
✍ Scribed by Rebecca Louise Simpson; Florencia Edith Wiria; Andrew A. Amis; Chee Kai Chua; Kah Fai Leong; Ulrich N. Hansen; Margam Chandrasekaran; Mun Wai Lee
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 495 KB
- Volume
- 84B
- Category
- Article
- ISSN
- 1552-4973
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✦ Synopsis
Abstract
95/5 Poly(L‐lactide‐co‐glycolide) was investigated for the role of a porous scaffold, using the selective laser sintering (SLS) fabrication process, with powder sizes of 50–125 and 125–250 μm. SLS parameters of laser power, laser scan speed, and part bed temperature were altered and the degree of sintering was assessed by scanning electron microscope. Composites of the 125–250 β‐tricalcium phosphate (CAMCERAM® II) were sintered, and SLS settings using 40 wt % CAMCERAM® II were optimized for further tests. Polymer thermal degradation during processing led to a reduction in number and weight averaged molecular weight of 9% and 12%, respectively. Compression tests using the optimized composite sintering parameters gave a Young's modulus, yield strength, and strain at 1% strain offset of 0.13 ± 0.03 GPa, 12.06 ± 2.53 MPa, and 11.39 ± 2.60%, respectively. Porosity was found to be 46.5 ± 1.39%. CT data was used to create an SLS model of a human fourth middle phalanx and a block with designed porosity was fabricated to illustrate the process capabilities. The results have shown that this composite and fabrication method has potential in the fabrication of porous scaffolds for bone tissue engineering. © 2007 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2008