頭部規格断層X線撮影による顎関節の矢状断面形態に関する研究 (2報)

抄録

One hundred temporomandibular joints of 50 adults with normal occulusion were studied using a cephalometric laminagraph “Sectograph”.
The results were follows:
1. There were significant correlations of anteroposterior length, vertical range and area between the mandibular fossa and the effective condylar region. Therefore, the mandibular fossa and the condyle on intercuspidated position were assumed to be similar in shape.
2. Concerning the condylar position on intercuspidated position.
1) The shortest distance between the frontal wall of the mandibular fossa and the condyle was 2.1mm, and the shortest distance between the rear wall and the condyle was 2.4mm. Therefore, the condyle is closer to the frontal wall.
2) The frontal sectional area between the mandibular fossa and the condyle was 27.3mm2, and the rear sectional area was 29.4mm2. Judging from the sectional area, the condyle is located roughly near the center or the mandibular fossa.
3) The highest point of the mandibular fossa being made as a datum, the condylar top was 3.4mm lower and 0.4mm posterior. Therefore, the condylar top is located slightly posterior.
3. This study makes possible the estimation of the proper mandibular position for prosthetic treatment such as occlusal reconstruction. It also established data for diagnosis on T.M.J. disease.