片側歯牙欠損によるサル顎関節の病理組織学的研究

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The patients with the functional disorder of the temporomandibular joint (TMJ) have been increasing gradually. Their occlusal condition often reveals the teeth loss. However the relationship between the teeth loss and it's syndrome is still unclear. The purpose of this paper is to describe the response of the TMJ under the teeth loss condition. The histopathological reactions of the TMJ were observed on 5th, 10th, 15th, 30th, 60th, 90th and 120th days after the extraction of the left half of the mandibular whole teeth in the rhesus monkey. The results were as follows : 1. Despite the unilateral loss of the teeth, the histopathological changes were observed in the bilateral temporomandibular joint. That remarkably appeared in the non-extracted site than in the opposite. 2. In the early stage after the extraction, there were almost no changes in the width of the condylar cartilagenous zone. Since 30 days after the extraction, the width gradualy thinned in the cartilagenous zone of the anterior condylar region and the region opposing the narrowest part of the articular disc, and notedly thickened in the region opposing the deepest part of the articular fossa and the posterior condylar region. These findings were significant on 120th day after the extraction. 3. Since the early stage after the extraction, the histologic changes occurred in the condylar chondrocytes. In the anterior condylar region and the region opposing the narrowest part of the articular disc, the chondrocytes decreased from the matured zone to the intermediate zone. In the condylar post-angle region and the posterior condylar region, that had increased from the intermediate zone to the matured zone. 4. Since the early stage after the extraction, the noticeable changes occurred in the cartilagenous zone just beneath the internal condylar post-angle region of the extracted site. Since 5 days after the extraction, the nucleus of the chondrocytes faded in the fibrous covering, intermediate zone and the differentiated zone. These findings gradualy advanced to the condylar bone. 60 days after the extraction, these findings extended to the erosioned zone. As the result of these changes, the loss of the cartilagenous relation was noticed on 120th day after the extraction. Therefore the depression of the condylar outline was remarkable. 5. The changes in the condylar bone were not remarkable in the early stage after the extraction. Since 90 days after the extraction, however, the resorption was noticed in the anterior condylar region and the region opposing the narrowest part of the articular disc, and the addition of the new bone in the condylar post-angle region and the posterior condylar region. 6. In the cartilagenous zone of the anterior region of the articular fossa, its width thinned due to a decrease in the chondrocytes. 7. Since the early stage after the extraction, the resorption occurred in the marginal bone of the posterior region of the articular fossa, and became significant on 30th day after the extraction. Since 60 days after the extraction, the addition of the new bone occurred in the form of the lamella bone. On 120th day after the extraction, the outline restored to the smooth margin in the posterior region of the articular fossa, and the addition of the new bone advanced as before. 8. In the articular disc, remarkable changes were not noticed. 9. The villies of the posterior region of the upper articular cavity multiplicated since 60 days after the extraction. 10. The anterior displacement of the condyle was supposed to have occurred on account of the histologic changes at this time. 11. The histopathological changes on the TMJ were very significant under the teeth loss condition. It is useful to consider the causative factor in the TMJ syndrome.
九州歯科学会の論文
1980-09-25

著者

喜久田利弘
九州歯科大学口腔外科学教室第1講座

片側歯牙欠損によるサル顎関節の病理組織学的研究

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