Abstract
This study aimed to evaluate whether the perioperative counterclockwise rotation (CCWR) of the proximal segment (PS) can reduce relapse after mandibular setback surgery. Patients who underwent less than 1° of bilateral perioperative rotation of the PS were assigned to group I (n=15). Group II (n= 14) included patients who showed greater than 1° of perioperative CCWR bilaterally. To evaluate the PS rotation and the relapse, three-dimensional computed tomography (CT) and lateral cephalography scans were analyzed. Even with significantly different perioperative CCWR of the PS (.07 ± .53° vs-3.47 ± 1.55°), the relapse was not significantly different between group I (1.96 ± 1.15 mm) and group II (1.81 ± .92 mm). However, postoperative CCWR of the PS was significantly greater in group I. The relapse was not influenced by the amount of setback. A small degree of relapse is expected after mandibular setback surgery, even with perioperative CCWR of the PS.
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