Abstract
AbstractAimThe purpose of the present study was to compare the mechanical characteristics and stress distribution when using two plates, or two plates joined by bridge, in the fixation of sagittal split ramus osteotomy (SSRO).Material and methodsA 3D finite element model of a hemimandible was created and a 5 mm advancement SSRO was simulated on a computer model. The model was fixed using three different techniques: two plates; two plates joined by one bridge; and two plates joined by two bridges. Load was applied until 3 mm displacement was attained and the results were compared with previous mechanical and photoelastic tests, thus analysing the mechanical stress developed in the proximity of miniplates and screws, as well as within the fixation system itself.ResultsFixation with two separate plates produced better mechanical resistance in the mechanical test for peak displacement, peak and ending load. In the photoelastic test, the same group exhibited better stress distribution, far from the osteotomy line. In the finite element analysis, the best technique involved two plates joined by one bridge, with the results showing a more uniform stress distribution.ConclusionsThis article may provide knowledge about the rational advantages of using two plates, which produced more mechanical resistance and better stress distribution.
Published Version
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