Abstract
This study compares temporomandibular joint
dysfunction (TMD) symptoms before and after
bilateral sagittal split ramus osteotomy, and identifies
predictive factors for the postoperative TMD
symptoms by assessing the adjusted odds ratio
using multiple logistic regression analysis. A consecutive
series of 37 cases treated only with bilateral
sagittal split ramus osteotomy were evaluated.
New postoperative TMD symptoms appeared in 9
cases, preoperative TMD symptoms disappeared in
6 cases, and TMD symptoms were unchanged in 5
cases. The median period until the interincisal
opening range attained 40 mm was 5 months
(range, from 2 to 15 months). Age was a positive
factor in patients with postoperative TMD symptoms,
with an odds ratio of 1.43 (95 percent confidence
interval, from 1.05 to 1.93). In addition, the
maximum value of the bilateral setback distance of
more than 9 mm was a positive factor of 6.95 (95
percent confidence interval, from 1.06 to 45.42). We
concluded that surgical correction in skeletal malocclusion
may affect temporomandibular joint
dysfunction symptoms.
