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Analysis of contact conditions of temporomandibular joint prosthesis

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Document pages: 10 pages

Abstract: Temporomandibular joint replacement (tmjr) is a complex surgical operation, in which the available artificial joints must ensure anatomical reconstruction and the natural range of motion of the temporomandibular joint (TMJ). Therefore, different types of temporomandibular joint prostheses are being implanted, including inventory prosthesis system and customized prosthesis. Although temporomandibular joint replacement (tmjr) is expected to complete its function within a few years, it may actually fail and need to be replaced. This paper analyzes the different design factors affecting the interface contact stress distribution of temporomandibular joint prosthesis, which eventually lead to the deterioration and failure of the prosthesis. With this purpose, a numerical model based on finite elements has been carried out in order to evaluate the stress states attained in different prosthesis configurations corresponding to general types of TMJ prostheses. On the other hand, the actual degradation of resected implants has been evaluated via optical microscopy. The linkage between the numerical simulations performed and experimental evidence allowed the authors to establish the different wear and damage mechanisms involved in the failure of stock TMJ prostheses. Indeed, the results obtained show that the contact stresses at the interface between the mandible and the glenoid fossa components play a key role in the failure process of the TMJR devices.

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