[Evaluation of sagittal temporomandibular condyle position in adolescent Angle Class II division 1 patients by cone-beam CT].

PURPOSE

To evaluate condyle-fossa relationship and provide some evidences for functional orthopedic treatment in adolescent Angle Class II division 1 patients.

METHODS

Forty adolescent Angle Class II division 1 patients (18 males, 22 females) who have to temporomandibular symptom were involved in this study and 42 adolescent Angle Class I patients (19 males, 23 females) served as control which had impacted teeth needed to take cone-beam CT (CBCT). Mimics 10.01 software was used to measure the depth of the mandibular fossa, the angulation of the posterior wall of the articular tubercle, anterior joint space, superior joint space, posterior joint space in CBCT imaging. Paired t test was applied for comparison between 2 groups using SPSS 15.0 software package.

RESULTS

The measured data on left and right side in both Angle Class II division 1 patients and Angle Class I patients had no significant differences (P>0.05). The depth of the mandibular fossa, the angulation of the posterior wall of the articular tubercle, the superior joint space have no significant difference (P>0.05). The anterior joint space decreased significantly (P<0.05) and posterior joint space increased significantly (P<0.05) in adolescent Angle Class II division 1 patients compared with adolescent Angle Class I patients.

CONCLUSIONS

In adolescent Angle Class II division 1 patients, anterior joint space decreased and posterior joint space increased compared with Angle Class I patients. And the condyle may move forward for compensation. Orthodontists should pay attention to condyle-fossa relationship in adolescent Angle Class II division 1 patients before functional orthopedic treatment.