Introduction: The TMJ is a complex joint and some prostheses have demonstrated abnormal function and limited longevities. The development of new designs and nanostructured biomaterials may improve future TMJ devices.

Objective: It was hypothesized that a more wear resistant, low friction articulating diamond-like surface, combined in a design with appropriate biomechanics could improve motion and stability of device systems. The goal was to investigate a design concept and a diamond-like articulating surface.

Methods: The methods were based on mechanical engineering design and analysis concepts (shape, size, motion and load). The phases of investigation-development were: 1) evaluate the dimensional and material properties of devices currently available within the commercial market, 2) interact with engineering design representatives from companies to evaluate information for evaluation via a Finite Element Model/Finite Element Analysis of candidate devices; and 3) evaluate the feasibility of a new system with dental, physics and engineering faculty.

Results: From the investigation/evaluation of existing designs and after interactions, two candidate designs were developed, both taking advantage of diamond-like materials. The vertical dimension of the prosthesis was as close to anatomically correct as possible. Features for soft tissue attachment for controlling motion were also incorporated. The designs included a ramus component with a decreased length, intended for surgical insertion through a single incision, as opposed to current surgical procedures.

Conclusions: This design and analyses project incorporated multiple steps for the development of a new TMJ prosthesis system. These designs are now being tested theoretically and biomechanically in order to consider a more safe and effective TMJ prosthesis system. Design and material rationales and results will be presented.

Partial funding from NIDCR Grant Number 2 R01 DEO13952-04 is acknowledged.

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