総義歯装着者の下顎窩形態に関する研究
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概要
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It has been said that the shape of the mandibular fossa may be variously changed by aging and some other factors. The mandibular fossa is a component of the temporomandibular joint and the change in its shape may intimately affect the mandibular movement. It is, therefore, of great importance to know the changing aspects of the mandibular fossa on reconstructing the occlusal surface of the prosthetic appliances in harmony with the mandibular movement. In this study, morphological differences by sex, age, left and right side, denture wearing period, and habitual one-sided mastication were investigated for complete denture wearers age 50 and over, using Fourier analysis for the radiographs taken by the standardized oblique lateral technique. The results were as follows : 1. No differences in shape of the mandibular fossa were found either between the right and the left side in each age group or among the different age groups. 2. The shapes of the mandibular fossa in males tended to be deeper than those in females. 3. In complete denture wearers with habitual one-sided mastication, the mandibular fossa of the non-masticating side was deeper from the roof to the anterior wall than that of the masticating side. 4. No differences were found between the dentulous group and the group wearing complete denture for a period of 5 years or less. However, in a comparison between the group of 5 years or less and the group of 6 to 10 years, the latter tended to show shallower shapes. Further significant changes could not be observed between the groups of 6 to 10 and 11 to 20 years, and between the groups of 11 to 20 and 21 years and over.
- 1984-02-25