Ozawa Tomomichi, Omura Susumu, Fukuyama Eiji, Matsui Yoshiro, Torikai Katuyuki, Fujita Kiyohide
Department of Oral and Maxillofacial Surgery, Yokohama City University Graduate School of Medicine, Yokohama, Japan.
Cleft Palate Craniofac J. 2007 May;44(3):286-91. doi: 10.1597/06-054.
To examine the effect of migration of the germ of the lateral incisor into the bone for eruption factors on bone bridge resorption.
Twenty-five subjects who underwent secondary alveolar bone graft were enrolled. The volume of the alveolar bone grafts immediately after the operation (V1), bone bridge formation 6 months postoperatively (V2), and tooth (teeth) migration into the bone bridge (Vt) were measured using a computed tomography (CT) image analyzer. Based upon these measurements, the following points were examined: (1) the correlation between the tooth-occupied ratio (Rt = Vt/V2 x 100) and the ratio of bone bridge resorption (Rv = (V1 - V2)/ V1 x 100); and (2) comparison of the tooth-occupied ratio (Rt) and the ratio of bone bridge resorption (Rv) between the groups with and without the germ of the lateral incisor.
A significant negative correlation was found between Rv and Rt (p < .001). Comparison of Rv and Rt between the groups with and without a germ of the lateral incisor revealed that both indices were significantly higher in the former group than the latter one (p < .05).
In cleft lip and palate patients with a germ of the lateral incisor, it is beneficial to carry out secondary bone grafting to the alveolar cleft at the age of 5 to 7 years, preceding eruption of the canine, in order to form a good bone bridge that will facilitate eruption of the lateral incisor and subsequent normal dentition and occlusion.
研究侧切牙牙胚向骨内移动这一萌出因素对骨桥吸收的影响。
招募25例接受二期牙槽骨植骨的受试者。使用计算机断层扫描（CT）图像分析仪测量术后即刻牙槽骨植骨的体积（V1）、术后6个月骨桥形成的体积（V2）以及牙胚向骨桥内移动的体积（Vt）。基于这些测量结果，研究以下几点：（1）牙占据率（Rt = Vt/V2×100）与骨桥吸收率（Rv = (V1 - V2)/V1×100）之间的相关性；（2）有侧切牙牙胚组和无侧切牙牙胚组之间牙占据率（Rt）和骨桥吸收率（Rv）的比较。
Rv与Rt之间存在显著负相关（p <.001）。有侧切牙牙胚组和无侧切牙牙胚组之间Rv和Rt的比较显示，前一组的两个指标均显著高于后一组（p <.05）。
对于有侧切牙牙胚的唇腭裂患者，在5至7岁犬牙萌出之前对牙槽裂进行二期植骨是有益的，以便形成良好的骨桥，促进侧切牙萌出及随后的正常牙列和咬合。
