歯牙欠損後の両隣在歯および周囲組織の病理組織学的研究

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A loss of tooth caused by teeth and periodontal diseases is frequently encountered in the daily clinical work. The two neighboring teeth and periodontal tissues, in coping with healing of tooth extraction wound and functional changes, show changes as reactions of the affected region to such a tooth loss. Detailed reports on experimental studes of healing process of tooth extraction wound, changes in the form of alveolar ridge, and shifts of the two neighboring teeth after a tooth loss are available. However, pathohistological studies of displacement process of the two neighboring teeth are few. Changes in periodontal ligaments, in particular, remain unaccounted for. Monkeys (macaca irus) were used for the present study. The lower first molar were extracted and changes in the periodontal tissues of the two neighboring teeth were investigated pathohistologically. The results were as follows : 1. Apposition of bone was seen three to thirty days after tooth extraction in the lower margin of the mandible between the two neighboring teeth inclusive of the extraction wound. 2. Roughing of the mesial wall of alveolar bone and bone resorption of the two neighboring teeth, due to physiologic tooth movement, continued until about 14 days after tooth extraction. 3. The changes resulting from extraction in the periodontal tissues of the two neighboring teeth seven days after extraction were resorption of the distal wall of alveolar bone of the second premolar and more remarkable resorption than before of the mesial wall of alveolar bone of the second molar. 4. Apposition of bone was seen 21 days after extraction in the peripheral walls of alveolar bone of the two neighboring teeth. At this point, physiologic tooth movement had already ceased. 5. Between 30-60 days after extraction, many osteoblasts appeared in the mesial side of the second premolar and in the distal wall of alveolar bone of the second molar. Apposition of new bone in strata was observed in some parts. In the opposite side of the alveolar bone, osteoclasts appeared. Periodontal ligaments at the resorpted site were irregular in arrangement and thickness of the bundles. Those at the boneadded site were regular in arrangement and thickness of the bundles. 6. New bone formed in strata 90 days after extraction on the mesial side of the second premolar and in the distal wall of alveolar bone of the second molar. Periodontal ligaments ran straight on the mesial side of the second premolar and in the upper half of the periodontal membrane on the distal side of the second molar. In the lower half of the periodontal membrane, they ran in wavy lines. 7. Displacement of the two neighboring teeth toward the extraction site was remarkable 90 days after extraction. Because of a grater bone addition in the distal wall of alveolar bone of the second molar, tooth displacement was more remarkable in the second molar. 8. Tooth displacement toward the extraction site was sliding of the tooth-body. 9. Changes in periodontal ligaments occurred mainly on the alveolar bone side than in the mid-part of periodontal membrane.
九州歯科学会の論文
1980-07-25

著者

岩井貞雄
九州歯科大学口腔外科学教室第1講座:九州歯科大学口腔病理学講座

歯牙欠損後の両隣在歯および周囲組織の病理組織学的研究

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