イヌ根未完成永久切歯における自家移植の機能的組織回復に関する研究-移植歯根表面性状の違いによる影響-

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  • Effects of Injured Root Surface on Reconstruction of the Tooth Supportive Structures after Autotransplantation of Canine Immature Permanent Incisors

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The purpose of this study was to investigate the influence of the root surface condition on autotransplanted canine permanent teeth with premature roots, and their periodontal ligaments.<BR>Bilateral maxillary second incisors with premature roots were extracted, the periodontal ligament on the right hand side tooth (the experimental tooth) was injured, and the tooth was then autotransplanted into the left-hand side socket.<BR>The extracted left hand tooth was autotransplanted into the right hand socket without any injury to the periodontal ligament as the control tooth.<BR>Changes to the periodontium were assessed after 13 weeks.<BR>The teeth were clinically monitored by measuring their mobility, together with intraoral photography and standardized X-ray examination.<BR>Non decalcified polished specimens were labeled fluorescenty for histological observation, and were evaluated with microradiography, fluorescence microscopy and polarizing microscopy. The following results were obtained.<BR>1. A significant difference in transplanted tooth mobility between the experimental and control teeth was observed 5 weeks later.<BR>2. Much more external root resorption was recognized in the teeth used for the experiment in comparison with the control teeth.<BR>3. The width of the periodontal space was recognized to be almost even around the roots of the control teeth, whereas the width of the periodontal space was uneven with constriction in the experimental teeth, and ankylosis could be observed<BR>4. There were few periodontal ligament fibers in the experimental teeth, but they could be seen covering large areas of the control teeth.<BR>5. The teeth used in the experiment was malpositioned distolabially in comparison with the control teeth.<BR>From a clinical and histopathological standpoint, the results suggested that the condition of the root surface can affect the regeneration of periodontal ligaments, and our data implied that the periodontal ligaments play an important role in compensation for the position of the teeth.

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