1989 Volume 38 Issue 4 Pages 905-914
This study examined the condylar positions of mandibular prognathism patients in centric occlusion radiographically. 40 patients were selected as mandibular prognathism group, who complained of severe anterior cross bite without facial asymmetry. Control group consisted of 20 volunteers with normal occlusion and asymptomatic TMJs. Lateral oblique transcranial radiographs were made of bilateral TMJs in centric occlusion on each subject. The films were traced and measured using a modified Blaschke and coworker's method to assess the condyle-fossa relationships along the postero-anterior axis of the TMJ. The two groups were compared and the results are as follows:
1) Normal occlusion group showed that of the condyles were in the anterior position near the center.
2) In the mandibular prognathism group, the average condylar position was anterior near the center same as the normal occlusion group. However, the dispersion of individual condylar positions around the average was greater in the mandibular prognathism group as compared to the normal occlusion group. Consequently the mandibular prognathism group showed that many of the condyles were in variable positions relatively far from center.
