Development of PMMA-precoating metal prostheses via injection molding: Residual stresses
✍ Scribed by Zhao, Wenping ;Barsun, Stephan ;Ramani, Karthik ;Johnson, Todd ;King, Richard ;Lin, Steve
- Publisher
- John Wiley and Sons
- Year
- 2001
- Tongue
- English
- Weight
- 284 KB
- Volume
- 58
- Category
- Article
- ISSN
- 0021-9304
- DOI
- 10.1002/jbm.1041
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✦ Synopsis
Abstract
Injection molding polymethylmethacrylate (PMMA) was developed as a potential metal prosthesis precoating method for surgical implantation. However, residual stresses generated in the injection‐molded PMMA affect the mechanical performance of the coating polymer. This study used plane polariscope testing to demonstrate the residual stress distribution in the injection‐molded polymer. Slitting and strain gages were combined with finite element analysis to give a quantitative measure of the residual stresses. The residual stress testing indicated that the highest circumferential residual stress in the injection‐molded PMMA was ≈5 MPa in tension. Two methods, water soaking and slitting, were developed for reducing residual stresses. A series of four surgical implantation simulation processes were designed. The two methods for reducing residual stress were used in the simulations. © 2001 John Wiley & Sons, Inc. J Biomed Mater Res (Appl Biomater) 58: 456–462, 2001