片側咬合挙上による両側顎関節の変化に関する実験的研究

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  • 山崎 博
    九州歯科大学大学院歯学研究科第1口腔外科

書誌事項

タイトル別名
  • An Experimental Study on Changes of the Bilateral Temporomandibular Joint by the Unilateral Bite Raising
  • カタガワ コウゴウキョジョウ ニヨル リョウソク ガクカンセツ ノ ヘンカ ニ

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抄録

Temporomandibular joint (TMJ) syndrome is a problem of special interest to oral surgions as well as to all the investigators in the dental field. Most investigators described the relationship between the occlusal disharmony and this syndrome. However, the origin and histopathological characteristics of this syndrome are still unclear. In order to study the influence of occlusal disharmony on TMJ, the histopathological changes were observed by the experimental bite raising in macaca irus with the metal-cast crown set on the lower unilateral molars. The results were as follows : 1. Despite the unilateral bite raising, histopathological changes were observed in the bilateral TMJ. 2. Histopathological changes occurred on the experimental side earlier and more remarkably than on the opposite side. 3. The increase in width of the cartilage layer was gradual but extensive untill the 30th day after the bite raising. After 60th day, the cartilage layer was seen arranged irregularly and the chondrocytes showed irregular forms. Thereafter the cartilage layer partly showed no condrocyte zone. 4. Sixty days after the bite raising, fibrous connective tissue proliferated on the condyle surface and the organization gradually increased. 5. Histopathological changes in the disc occurred earlier than in the fossa and condyle. The median structure region of the experimental side showed the wave-like direction and the fibers on the rear side of the disc were close-arranged significantly. In the non-experimental side, the fibers became straight in direction and were detatched from each other. 6. Histopathological changes in the fossa occurred slower than in the disc and condyle. The cartilage layer were seen arranged irregularly and fibrous connective tissue proliferated. 7. The cartilage-like cells were observed on fibrous capsule of condyle, fossa, and the surface of the disc on the experimental side. 60 days after the bite raising, the cartilage-like cells appeared on both sides and clone-forming was observed.

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