Thesis (Ph.D.) - Cairo University - Faculty of Oral and Dental Medicine - Department of Oral and Maxillofacial Surgery

This study aimed at assessing the skeletal stability of adjustable mini plates in comparison to conventional mini plates following bilateral sagittal split ramus osteotomy (BSSRO) Fourteen patients were divided into 2 equal groups. Patients in both groups underwent BSSRO and mandibular setback. In the study group, the bone segments at the osteotomy site were stabilized using the adjustable plates and four 2.0 mm monocortical screws. In the control group, bone segments at the osteotomy site were stabilized using conventional miniplates and four 2.0 mm monocortical screws. Each patient was assessed in terms SNB, mandibular plane angle (MPA) recorded in degrees ({u00B0}) and horizontal and vertical changes of the B-Point recorded in millimeters (mm). Skeletal stability was contemporaneous in both groups with an insignificant difference regarding the assessment criteria. However, adjustable plates showed the advantage of decreasing operative time when occlusion is not perfect at the release stage and adjustments were required.The choice of the fixation method should combine between sufficient stability for early jaw mobilization and elasticity to allow for intraoperative and early postoperative corrections. Such requirements were met by the adjustable plates

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