[Research of condylar movement on nonworking side during quantitative lateral movement of mandible]

Cephalometric laminagraphs were taken on 40 left and right sides of 20 adults with normal occlusion. It was found that condyle of nonworking side during quantitative lateral movement at incisal region with 1mm interval up to 3mm. The results were analyzed by computer superposition graph. The results were as follows: 1. The displacement of condyle during quantitative lateral movement of the mandible was 1.00mm, 1.93mm and 2.88mm at condylar top from intercuspal position to a maximum 3mm, 1mm by 1mm average, respectively. The displacement at condylar center was 0.97mm, 1.92mm and 2.85mm average, respectively. It was noticed that condyle on nonworking side with lateral movement translated equal distances. 2. The inclination of condyle by the quantitative lateral movement of the mandible was 45.41 degrees, 49.13 degrees and 48.59 degrees at condylar top from intercuspal position to a maximum 3mm, 1mm by 1mm average, respectively. The inclination at condylar center was 44.21 degrees, 48.06 degrees and 48.44 degrees average, respectively. Directional stabilizing with condylar movement, was seen. 3. The range of condylar movement from intercuspal position, at condylar center was maximum; 40.1 degrees, minimum; 0.0 degrees, average; 10.05 degrees, SD; 7.98 degrees. 4. The results of the survey on rotation factor with condylar movement revealed that there was a slight difference, and the movement of condyle was like bodily shift.