Thesis (M.Sc.) - Cairo University - Faculty of Oral and Dnental Medicine - Department of Oral and Maxillofacial Surgery

This study was conducted on one group of 8 patients (5 females and 3 males), suffering from chin deformities.The patients were evaluated for the chin deformity using the cephalometric analysis. Patient consented to the surgery after acceptance of the procedure. The patient cone beam computed tomography was used to fabricate the custom made miniplate for the genioplasty with a cutting guide for the osteotomy and the predetermined plate screw holes.The procedure was done under general anesthesia. The postoperative cone beam computed tomography was taken 1 month after the surgery. Reference point and planes were taken and measured on the postsimulation and the post-operative CT. Statistical analysis showed non-significant difference between the preoperative post-simulation readings (Pog- Nasion Perpendicular). ( S-N-Pog) and (Pog to right and left mental planes) (P<0.05). Overall superimposition of both Models showed range of accuracy percentage between 72% and 92% with mean value of 82.75% which is considered acceptable in the range. The computer guided genioplasty procedure showed high accuracy in its results. The positioning of the genial segment was facilitated and the operative time was reduced. Patients showed less postoperative hypoesthesia due to the planned cut away from the vital structures

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