Optimizing mandibulomaxillary plate fixation by computerized simulation

Current mandibulomaxillary fixation (MMF) systems tend to deform easily and maintain proper alignment between the mandible and maxilla relatively poorly, resulting in malocclusion in approximately 36% of cases. A novel device was designed to specifically minimize deflection leading to misalignment by optimizing the structural dimensions of a C-channel beam that directly bridges the mandible and maxilla. It is fixed in the oral cavity such that it resists bending forces produced by the mastication muscles and operates in the elastic region of its stress-deflection curve to minimize permanent misalignment. Simulations of the device´s performance using Solidworks modeling software yielded deflection data in response to physiological loads. These results were used to fully characterize the effect of device dimensions and optimize the device design as a function of beam width and thickness and flange thickness. Simulations of the optimized device indicate maximum deflection significantly less than required and the final device is predicted to stabilize mandibulomaxillary alignment during fixation the typical 6-week healing period.