抄録
The greatest care must be paid in discussing a possible cause of temporomandibular joint disorders because there were sexal difference and changes with aging in the masticatory structure as described in Part 1. The purpose of this part is to clarify the sexal difference and changes with aging of the temporomandibular bone surface and to elucidate the effect of masitication on the temporomandibular bone changes.
Results: Bone changes frequently occured at the lateral side of the condyle, lateral and central sides of the eminence and in a central part of the anterior slope of the eminence. Old females showed a higher score of changing than males with a significant difference between them. Molar or posterior tooth defect had an influence on the condyle and temporal component changes in the young. Progressed attrition with aging influenced on the changes of the temporal component bone surface in males. The temporomandibular joint in males showed a relative stability from the end of growth period to 30 years of age, but females showed no stability throughout the life including growth period. Edentulous changes were caused by aging and loss of teeth so long as this study concened.
