外傷性咬合に関する実験的研究

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タイトル別名
  • An Experimental Study of Traumatic Occlusion
  • ガイショウセイ コウゴウ ニ カンスル ジッケンテキ ケンキュウ

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Traumatic occlusion has been known to cause traumatic changes in the teeth and paradentium. However, there have been few reports on investigations of its effects on the alveolar bone marrow and the mandible as well as on the teeth and paradentium. Traumatic occlusion, therefore, was produced by mounting metal crowns on the lateral mandibular molars of Macaca irus and histopathological investigations were made of its effects on the teeth, paradentium, alveolar bone marrow, and mandible. The results were as follows : 1. The traumatic changes caused in the paradentium were narrowing and enlarging of the periodontal space, regressive changes in the periodontal fibers, bone resorption in the surface layer of the alveolar bone adjacent to the periodontal space, and resorption of cementum. 2. The traumatic changes in the paradentium occurred from the fifth day after operation. The changes in the root apex and its surrounding region were most significant on the 15th day after operation. The changes in the interradicular area increased by the day. 3. The traumatic changes were observed mainly in the interradicular area, root apex, periodontal membrane mesial to the longitudinal root apex, and its surrounding region. The changes were most significant in the interradicular area, followed by the root apex and the mesial side of each root. 4. The remodeling changes in the paradentium affected by the traumatic changes were the formation of glanulation tissue in the necrosed portion of the periodontal membrane and its resorption cavity of bone and cementum, hypertrophy of the periodontal fibers, and bone apposition in the surface layer of the alveolar bone. 5. The effects of traumatic occlusion extended even to the alveolar bone marrow cavity and the mandible. 6. In the bone marrow cavity of the alveolar bone, new-bone apposition was observed from the fifth day after operation and intensified by the day. Particularly, in the periodontal space affected by the traumatic changes, ossification in the bone marrow cavity of the alveolar bone was extensive. 7. The formation of new-bone trabeculae, as osteoid tissue, from the bone marrow cavity of the alveolar bone around the root apex to the lower margin of the mandible appeared from the fifth day after operation. The trabeculae gradually extended toward the lower margin of the mandible, increased their width daily, and developed into bone tissue. 8. New-bone apposition was also observed from the fifth day after operation from the surrounding regions of the trabeculae in the mandible and from the bone marrow cavity of the lower margin of the mandible. Bone apposition was also observed in the lower margin of the mandible on the 120th after operation.

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