[The effect of sagittal split ramus osteotomy for advancing the mandible on temporomandibular joint].

10 patients who received sagittal split ramus osteotomy for advance the mandible were examined clinically and radiographically to assess condylar position preoperatively and six months postoperatively. The results showed after surgery maximal interincisal opening was significantly reduced; anterior, upper, posterior space of temporomandibular joint were changed; 14/20 condyles were relatively retropositioned; and 6/20 condyles were relatively forward positioned. Alteration in condylar position may undergo adjustment and remodeling in order to adapt the new position in most patients. In some patients symptoms and signs of the joint disappear following changing of condylar position.