Studies on the development of new transplantation and replantation of teeth, and its clinical trials.

新型牙移植、再植技术的发展及临床试验研究。

• 批准号: 06557109
• 负责人: TAKAHASHI Yuzo
• 金额: $ 7.36万
• 依托单位: Tokyo Medical and Dental University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06557109/
• 关键词: Transplantation of tooth; Replantation of tooth; デジタルサブトラクション法; 外傷歯

The clinical studies on the replantation of avulsed permanent teeth were undertaken, to know the successful conditions on the long-term prognosis. From the results of above studies, theprocedures of strage, length of strage period and procedures of fixation were important to prevent the injury of periodontal ligament and root resorption.After taking the experiences of the replantation of avulsed permanent teeth, we have performed the clinical trials of the transplantation of permanent teeth.On the surgical procedure, low speed drilling system using trphine and stamp bar and irrigation system of cold saline to prevent the over heating of the socket bone, and light rigid fixation system to prevent the replacement resorption of root were developed.Clinical cases of the transplantation of permanent teeth are classified into 6 patterns according to the experiences from our fourty-seven cases performed for 2 years, 1.relantation of traumatic tooth, 2.surgical extrusion (intra-alveolar transplantation), 3.intentional replantation, 4.immediate transplantation into extraction socket, 5.immediate transplantation in edentulous alveolar ridge, 6.immediate transplantation into area of extirpation of cyst.On the prognosis for two years, three transpanted teeth were lost because these three teeth used as donors were suffered from peridontitis marginalis.The qualitative changes of alveolar bone surrounding transplanted teeth were sequentially evaluated by the degital subtraction method. The alveolar ridge of bone had been absorbed until about 40 days after transplantation. Then, new bone formation on edge of albeolar bone were observed.

进行撕脱恒牙再植的临床研究，了解成功条件对远期预后的影响。以上研究结果表明，牵拉方法、牵拉时间长短和固定方法是预防牙周膜损伤和牙根吸收的重要措施，我们在总结恒牙撕脱再植经验的基础上，进行了恒牙再植的临床试验，在手术方法上，使用trphine和印模棒的低速钻孔系统和冷盐水冲洗系统以防止窝骨过热，并研制了轻型刚性固定系统，以防止牙根的替换吸收。根据2年来47例患者的经验，将其分为6种类型：1.外伤性牙再植，2.外科挤压（牙槽内移植），3.有意再植，4.即刻移植于拔牙窝，5.即刻移植于无牙槽嵴，6.囊肿摘除后立即移植，术后2年预后观察，3颗移植牙均因患边缘性牙周炎而丢失，移植牙周围牙槽骨的质的变化用数字减影法连续评价牙齿。移植后40天左右，牙槽嵴已被吸收。然后观察牙槽骨边缘新骨形成情况。