Changes in condylar position within 12 months after bilateral sagittal split ramus osteotomy with and without Le Fort I osteotomy by using cone-beam computed tomography

ABSTRACT Objective: To evaluate sequential images of the condylar position in relation to the glenoid fossa after orthognathic surgery in patients with facial asymmetry using cone beam computed tomography. Materials and Methods: A total of 20 adult patients (11 men and 9 women; mean age, 22.1 ± 4.02 years) with facial asymmetry who underwent sagittal split ramus osteotomy with rigid fixation were involved. Cone beam computed tomography scans were obtained before treatment (T0), 1 month before the surgery (T1), and 1 day (T2), 3 months (T3), 6 months (T4), and 12 months (T5) after the surgery. The condyle position was evaluated. Results: At 1 day after surgery (T2), the condylar position on both sides significantly changed posteriorly, inferiorly, and laterally, but no significant difference was observed between the nonaffected and affected sides. The condyle on the nonaffected side had a tendency to recover its preoperative position at 3 months after surgery (T3) and inclined slightly laterally up to 1 year after the surgery (T5). The condyle on the affected side returned more closely to the glenoid fossa than to its pretreatment position at 3 months after surgery (T3). Thereafter, it showed a more backward and downward position (T5). Conclusions: The overall condylar position after an orthognathic surgery in patients with facial asymmetry was relatively stable at 1 year after surgery. However, the condyle on the affected side during the first 3 months after surgery should be carefully monitored for surgical stability.

Download Full-text

Effect of setback Le Fort I osteotomy on midfacial soft-tissue changes as evaluated by cone-beam computed tomography superimposition for cases of skeletal Class III malocclusion

International Journal of Oral and Maxillofacial Surgery ◽

10.1016/j.ijom.2012.11.012 ◽

2013 ◽

Vol 42 (6) ◽

pp. 790-795 ◽

Cited By ~ 10

Author(s):

J.-Y. Lee ◽

Y.-I. Kim ◽

D.-S. Hwang ◽

S.-B. Park

Keyword(s):

Computed Tomography ◽

Cone Beam ◽

Class Iii ◽

Class Iii Malocclusion ◽

Le Fort I Osteotomy ◽

Le Fort ◽

Skeletal Class ◽

Tissue Changes ◽

Soft Tissue Changes ◽

Le Fort I

Download Full-text

Cone-beam computed tomography evaluation on the condylar displacement following sagittal split ramus osteotomy in asymmetric setback patients: Comparison between conventional approach and surgery-first approach

The Angle Orthodontist ◽

10.2319/122316-925.1 ◽

2017 ◽

Vol 87 (5) ◽

pp. 733-738 ◽

Cited By ~ 3

Author(s):

Min-Hee Oh ◽

Hyeon-Shik Hwang ◽

Kyung-Min Lee ◽

Jin-Hyoung Cho

Keyword(s):

Computed Tomography ◽

Correlation Analysis ◽

Cone Beam Computed Tomography ◽

Facial Asymmetry ◽

Three Dimensions ◽

Conventional Group ◽

Cone Beam ◽

Sagittal Split Ramus Osteotomy ◽

Surgery First ◽

Condylar Displacement

ABSTRACT Objective: To compare the condylar displacement following sagittal split ramus osteotomy (SSRO) in asymmetric setback patients between the conventional approach and surgery-first approach and to determine whether the condylar displacement is affected by asymmetric setback in SSRO patients. Materials and Methods: This was a retrospective study. The subjects consisted of patients with facial asymmetry who underwent SSRO and had cone-beam computed tomography taken before and 1 month after surgery. They were allocated into the conventional (n = 18) and surgery-first (SF) groups (n = 20). Descriptive, independent t-tests and Pearson correlation analysis were computed. Results: The amount of condylar displacement in x-, y-, and z-directions and Euclidean distance showed no statistically significant differences between the conventional and SF groups. Comparing the postoperative condylar position with the preoperative position, the condylar displacement occurred in posterior (P < .05) and downward (P < .05) directions in both groups except on the deviated side in the conventional group. The condylar displacement occurred in a posterior (P < .05) direction on the deviated side of the conventional group. However, the condylar displacement in three dimensions showed no statistically significant differences between the two groups. In the correlation analysis, the condylar displacement in both the deviated and contralateral sides showed no significant correlation with asymmetric setback in either group. Conclusion: The condylar displacement in three dimensions and the distance of condylar displacement in SSRO patients with facial asymmetry showed no significant difference between conventional and SF groups. Condylar displacement was not associated with asymmetric setback.

Download Full-text