A Novel Method for the Assessment of Three-Dimensional Tooth Movement during Orthodontic Treatment
A Novel Method for the Assessment of Three-Dimensional Tooth Movement during Orthodontic Treatment
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DOI：
10.2319/042308-225.1
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发表时间：
2009-05-01
影响因子：
3.4
通讯作者：
Yoshida, Noriaki
中科院分区：
文献类型：
--
作者：
Jang, Insan;Tanaka, Motohiro;Yoshida, Noriaki
目的：目的（1）评价腭皱作为牙颌模型重叠标志的稳定性;（2）建立上颌牙颌模型三维重叠方法，用于正畸牙移动分析。材料与方法：样本由10名患者的牙模组成，这些患者接受了双侧上颌第一前磨牙的拔除和三个腭部微螺钉的放置，作为撤回的支抗。前牙采用激光表面扫描系统对牙体模型进行测量，并进行三维图像重建。将系列牙模叠加在三个微型螺钉上作为注册标志（微型螺钉叠加法），并测量拔牙间隙关闭期间每个腭皱点的位移。结果：在整个矫治过程中，第三腭皱的中点和腭穹隆的形状是稳定的。结论：上颌牙颌模型可以可靠地叠加在第三腭皱和腭穹隆的中点上作为参考标志。（角度正交2009;79：447-453）。
Objective: To (1) evaluate the stability of palatal rugae as landmarks for superimposition of dental casts and (2) establish a three-dimensional superimposition method of maxillary dental casts for analyzing orthodontic tooth movement.Materials and Methods: The sample consisted of dental casts obtained from 10 patients treated with extraction of bilateral maxillary first premolars and placement of three palatal miniscrews as anchorage for retraction of the anterior teeth. Dental casts were measured by means of laser surface scanning system, and three-dimensional images were reconstructed. Serial dental casts were superimposed on the three miniscrews as registration landmarks (miniscrew-superimposition method), and the displacement of each palatal ruga point during the closure of extraction spaces was measured. Displacement of the central incisors was measured by the miniscrew-superimposition method and the proposed superimposition technique (ruga-palate-superimposition method), Correlation analysis and paired Mests were performed to determine whether a significant difference existed between the measurements of the two superimposition methods.Results: The medial points of the third palatal rugae and the shape of the palatal vault were stable throughout the treatment. The displacement of the central incisors measured using the ruga-palate-superimposition method showed no significant difference with that measured using the miniscrew-superimposition method.Conclusion: The maxillary dental casts can be reliably superimposed on the medial points of the third palatal rugae and the palatal vault as reference landmarks. (Angle Orthod. 2009;79: 447-453.)