後方接触位におけるか頭位について

Abstract

This examination employed continuously configured cephalometric laminagraphs of right and left T. M. J. with computer operated superposition.I also examined condylar movement from the intercuspal position (i. p.) to retruded contact position (r. c. p.) in the sagittal plane.The results were as follows:1. The direction of movement of the condyle from the i. p. to r. c. p. was 182.88±76.56° at the condylar top (C. T.), and 187.01±69.80° at the condylar center (C. C.). In most cases, the movement was backward or upper backward, whereas it was dispersed to almost all direction.2. The distance of movement the condyle from the i. p. to the r. c. p. was 0.47±0.29mm at the C. T., and 0.46±0.29mm at the C. C.3. The closest distance between the posterior wall of the articular fossa and condyle was 2.35±0.72mm at the i. p. and 2.09±0.70mm at the r. c4. The similar trend of C. T. and C. C. in the moving direction toward r. c. p. was noted in 70% of all cases.5. In the inclination of the movement from the baseline, 93% of all cases were within±3.0°, and all cases were within±4.0°. This bodily movement was involved in most cases of the behavior of condyle toward r. c. p.6. A significant difference was noted between left and right sides at the C. T. and C. C. with the level of significance being at 5%. Because no correlation was found, there is no similarity in the leftward and rightward directions.