Development of PMMA-precoating metal prostheses via injection molding: residual stresses.
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 approximately 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.
Zhao
W
W
Composites and Polymer Processing Laboratory (CPPL), School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47907-1288, USA.
Barsun
S
S
Ramani
K
K
Johnson
T
T
King
R
R
Lin
S
S
D000818:Animals; D016723:Bone Remodeling; D018786:Bone Substitutes; D006801:Humans; D008670:Metals; D019904:Polymethyl Methacrylate; D019736:Prostheses and Implants
D018786:Bone Substitutes; D008670:Metals; D019904:Polymethyl Methacrylate