π-plate as the best plate for osteosynthesis of angular mandible fracture
DOI:
https://doi.org/10.11603/2311-9624.2018.2.8999Keywords:
mandible angular fracture, the stress-deformed state, π-plate, osteosynthesis, Ansys Workbench.Abstract
Summary. An angular fracture occurs most often in the fracture of the mandible. The frequency of complications after osteosynthesis with high-quality titanium plates of known configurations remains rather high.
The aim of the study – to determine the most optimal form of the titanium plate among the most commonly used with the help of numerical simulation which takes into account the direction and value of the force of chewing muscles.
Materials and Methods. To determine the optimal configuration of the plate not only the value of the pressure and plate area were used but also the relative displacement of the mandible fractures. A computer tomography was used to obtain a three-dimensional computational model, which was exported to the Ansys Workbench software suite.
Results and Discussion. As a result of our research, we found that in the osteosynthesis of the angular mandible fracture accomplished with our π-plate, the largest displacement of the fragments relative to each other was 0.14 mm. That means this plate provides reliable fixation of fragments. The greatest pressure that arose in the π-plate was 364 MPa. This pressure is less than the yield point therefore when the load is removed the plate returns to its original position. It should be noted that the installation of the plate in the other direction gives an excess of the material’s yield point.
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