Accuracy and reliability of palatal superimposition of three-dimensional digital models
Accuracy and reliability of palatal superimposition of three-dimensional digital models
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DOI：
10.2319/101309-569.1
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发表时间：
2010-07-01
影响因子：
3.4
通讯作者：
Cha, Bong-Kuen
中科院分区：
文献类型：
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作者：
Choi, Dong-Soon;Jeong, Young-Mok;Cha, Bong-Kuen
目的：为了评估的准确性，三维（3D）数字模型的叠加使用腭表面作为参考测量牙齿movement.Materials和方法：上颌石膏模型，从20例患者中选择。分别在牙龈边缘下方切割左右犬齿、前磨牙和磨牙，并在蜡中建立（石膏模型1 = PM 1）。扫描PM 1以创建3D数字模型（数字模型1 = DM 1）。随机移动PM 1上的牙齿（石膏模型2 = PM2），随后扫描以产生另一组3D数字模型（数字模型2 = DM 2）。通过面-面匹配软件，以腭部区域为参考，将DM 1 s和DM 2s叠加，并计算牙齿移动的变化。在石膏模型中，使用参考测量仪器直接测量牙齿移动。结果：石膏模型和数字模型的牙齿前后向（x轴）、横向（y轴）和垂直向（z轴）移动的平均值没有显著差异，石膏模型和数字模型之间存在很高的相关性。结论：从技术的角度来看，使用腭表面的3D数字模型的叠加提供了准确和可靠的测量，但仍然需要研究在生长和/或矫形治疗发生后腭表面纵向稳定性如何。（角度正交2010;80：685-691）。
Objective: To evaluate the accuracy of the superimposition of three-dimensional (3D) digital models using the palatal surface as a reference for measuring tooth movements.Materials and Methods: Maxillary plaster models were selected from 20 patients. The right and left canines, premolars, and molars were individually cut underneath the gingival margins and set up in wax (plaster model 1 = PM1). The PM1s were scanned to create 3D digital models (digital model 1 = DM1). Teeth on the PM1s were randomly moved (plaster model 2 = PM2) and subsequently scanned to produce another set of 3D digital models (digital model 2 = DM2). DM1s and DM2s were superimposed using the palatal area as reference via surface-to-surface matching software, and the changes in tooth movement were calculated. In the plaster models, the tooth movements were directly measured using the Reference Measurement Instrument. A paired t-test and a correlation analysis were performed to determine whether the two measurement methods differed significantly.Results: The means of the anteroposterior (x-axis), transverse (y-axis), and vertical (z-axis) tooth movements of the plaster models and the digital models did not differ significantly, and very high correlations were found between the plaster models and the digital models.Conclusion: From a technical point of view, the superimposition of 3D digital models using the palatal surface provides accurate and reliable measurements, but it remains to be investigated how stable the palatal surface is longitudinally after growth and/or orthopedic treatment take place. (Angle Orthod. 2010;80:685-691.)