両側下顎臼歯部欠損による残存前歯部歯周組織への影響に関する実験的研究

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In daily clinical practice, residual occlusal teeth after a multiple dental defect often involve traumatic changes due to an abnormal biting pressure. However, no report is available of an experimental study on changes in the residual occlusal teeth and the paradentium after a multiple dental defect. Using rhesus monkeys with teeth and paradentium most similar to man, the author made a histopathological examination of the influences of a bilateral mandibular molar regional defect on the residual teeth and the paradentium in the anterior region. The results obtained were as follows : 1. On the mesial angle side from the labial side of the root upper region and on the palatal (lingual) side of the root lower region, findings on the pressure side, such as narrowing of the periodontal space, regressive changes of the periodontal fibers and bone resorption in the alveolar inside wall, were observed on and after the 5th postoperative day. 2. On the distal side from the palatal (lingual) side of the root upper region and the labial side of the root lower region, findings on the tension side, such as enlarging of the periodontal space, tension of the periodontal fibers and osteogenesis in the alveolar inside wall, were observed on and after the 5th postoperative day. 3. These changes became slight on the 30th postopeative day, and on and after the 60th postoperative day the periodontal membrane and the alveolar bone underwent a tissue reconstruction to cope with the abonrmal biting pressure. This tissue reconstruction was almost over on the 180th postoperative day. 4. With the alveolar inside wall reconstruction, there also occurred changes in both the alveolar outside wall and the alveolar marrow. 5. The cementum always had less changes than the alveolar bone, and there was observed only a persistent apposition of newly developed cementum on the labial side of the root lower region. 6. Histological changes on the upper and lower jaw sides presented some differences in degree and appearance time but were almost the same. 7. The dental drifting was considered to be in the labial direction due to a tipping with a point one-third of the footh length from the root apex as its center. 8. The above histopathological examination of a bilateral mandibular molar regional defect suggested that the anterior teeth region was strongly influenced by a lateral pressure in the labial direction rather than by a vertical pressure in the root apical direction.
九州歯科学会の論文
1984-10-25

両側下顎臼歯部欠損による残存前歯部歯周組織への影響に関する実験的研究

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