BIOMECHANICAL ANALYSIS OF DIFFERENT TYPES OF FIXATION IN THE SAGITTAL SPLIT RAMUS OSTEOTOMY AFTER DIFFERENT TYPES OF MANDIBULAR MOVEMENTS: A FINITE ELEMENT STUDY.
Osteotomy, Sagittal Split Ramus; Mandibular Advancement; Jaw Fixation Techniques
The present study aimed to evaluate the best osteosynthesis arrangement in patients that underwent orthognathic surgery with mandibular advancement and mandibular angle clockwise and counter-clockwise rotation through a finite element analysis. A virtual model of a mandible was obtained via CT scan and then subjected to different kinds of surgical planning in the Dolphin® software. A total of 6 surgical plans were made and 6mm and 12mm advances were associated with linear, clockwise and counter-clockwise rotation of the mandibular angle. The virtually operated mandibles were then transformed in a solid framework in the NX 10® software. In this stage, the mandibular solids were meshed with the solids of the osteosynthesis plates and screws in a one or two plate fashion using 4 or 8 mini screws respectively. After the 12 solids were built, the Nastran software® was utilized to evaluate the superficial tensions after loading in the incisors region.