A Study on the increase of supporting alveolar bone during intrusion of tooth

牙压低过程中牙槽骨支撑力增加的研究

• 批准号: 14571973
• 负责人: NAKAMURA Yoshiki
• 金额: $ 1.92万
• 依托单位: Tsurumi University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14571973/
• 关键词: tooth movement; Intrusion; alveolar bone; micro CT; Tetracycline; テトラサイクリン

Intrusion is one type of tooth movement and teeth are usually intruded by about two-four mm into the alveolar bone. I this situation, the alveolar crest is also resorbed, ad consequently the relationship between supporting alveolar bone and tooth is maintained. This is due to the supra-alveolar fibers which are stretched downward with the intruded tooth. Intrusion produces no increase of the supporting bone. In this study we attempted to increase the supporting bone during the intrusion of a tooth by cutting the supra-alveolar fibers (septotomy). Mandibular third premolars (P3) of beagle dogs were used as materials. The P3 on both side were intruded for 4 weeks with skeletal anchorage system. Septotomy was performed every weeks around the P3 on one side of the mandible. Some of the P3 used as controls. After the intrusion, the dogs were fixed with formalin, and P3 with the surrounding bone were dissected out, dehydrated, embedded in resin. Then the specimen were observed with micro CT. Three dimensional images of the alveolar bone of P3 was constructed. The control P3 (without intrusion) was evenly surrounded by the alveolar bone. After 4 weeks, the P3 was intruded by about 2 mm with buccal movement. The lingual alveolar bone height was same with that of the control. The buccal alveolar crest was moved downward and the alveolar bone height considerably decreased. P3 with septotomy showed different aspects. Width of lingual alveolar bone increased, though the location of alveolar crest was not changed. The location of the buccal alveolar crest moved upward, indicating the increase of the alveolar bone height. The results suggest that intrusion with septotomy induces the increase of supporting bone.

侵入是一种类型的牙齿运动，牙齿通常被约24毫米侵入牙槽骨。在这种情况下，牙槽波峰也被吸收，因此保持了支撑牙槽骨和牙齿之间的关系。这是由于上肺泡纤维用侵入的牙齿向下拉伸。侵入不会产生支撑骨的增加。在这项研究中，我们试图通过切割上肺泡纤维（隔室切开术）来增加牙齿侵入牙齿的支撑骨。小猎犬狗的下颌第三磨牙（P3）用作材料。两侧的P3用骨骼锚定系统侵入4周。每周在下颌骨的一侧每周进行间隙。一些P3用作控件。入侵后，将狗用福尔马林固定，并剖析了带有周围骨头的P3，脱水，嵌入树脂中。然后用微CT观察样品。构建了P3的牙槽骨的三维图像。对照P3（无侵入）被牙槽骨均匀地包围。 4周后，P3被约2 mM侵入颊运动。舌牙牙骨高度与对照相同。颊牙肺泡峰向下移动，牙槽骨高度大大降低。带有隔术的P3显示出不同的方面。尽管没有改变牙槽波峰的位置，但舌牙牙骨骨的宽度增加。颊牙牙冠的位置向上移动，表明牙槽骨高度的增加。结果表明，隔术侵入诱导支撑骨的增加。