Chang Yu-Bing, Xia James J, Gateno Jaime, Xiong Zixiang, Teichgraeber John F, Lasky Robert E, Zhou Xiaobo
Surgical Planning Laboratory, Department of Oral and Maxillofacial Surgery, Methodist Hospital Research Institute, Houston, TX, USA.
J Oral Maxillofac Surg. 2012 Apr;70(4):952-62. doi: 10.1016/j.joms.2011.02.109. Epub 2011 Jul 20.
The purpose of the present study was to evaluate the accuracy of our newly developed approach to digital dental model articulation.
Twelve sets of stone dental models from patients with craniomaxillofacial deformities were used for validation. All the models had stable occlusion and no evidence of early contact. The stone models were hand articulated to the maximal intercuspation (MI) position and scanned using a 3-dimensional surface laser scanner. These digital dental models at the MI position served as the control group. To establish an experimental group, each mandibular dental model was disarticulated from its original MI position to 80 initial positions. Using a regular office personal computer, they were digitally articulated to the MI position using our newly developed approach. These rearticulated mandibular models served as the experimental group. Finally, the translational, rotational, and surface deviations in the mandibular position were calculated between the experimental and control groups, and statistical analyses were performed.
All the digital dental models were successfully articulated. Between the control and experimental groups, the largest translational difference in mandibular position was within 0.2 mm ± 0.6 mm. The largest rotational difference was within 0.1° ± 1.1°. The averaged surface deviation was 0.08 ± 0.07. The results of the Bland and Altman method of assessing measurement agreement showed tight limits for the translational, rotational, and surface deviations. In addition, the final positions of the mandibular articulated from the 80 initial positions were absolutely agreed on.
The results of our study have demonstrated that using our approach, the digital dental models can be accurately and effectively articulated to the MI position. In addition, the 3-dimensional surface geometry of the mandibular teeth played a more important role in digital dental articulation than the initial position of the mandibular teeth.
本研究的目的是评估我们新开发的数字牙模咬合方法的准确性。
使用12套来自颅颌面畸形患者的石膏牙模进行验证。所有模型咬合稳定，无早接触迹象。将石膏模型手动调整到最大牙尖交错位（MI），并用三维表面激光扫描仪进行扫描。这些处于MI位的数字牙模作为对照组。为建立实验组，将每个下颌牙模从其原始MI位松开至80个初始位置。使用普通办公个人电脑，采用我们新开发的方法将它们数字调整到MI位。这些重新调整后的下颌模型作为实验组。最后，计算实验组和对照组在下颌位置的平移、旋转和表面偏差，并进行统计分析。
所有数字牙模均成功咬合。对照组和实验组之间，下颌位置最大平移差异在0.2 mm±0.6 mm以内。最大旋转差异在0.1°±1.1°以内。平均表面偏差为0.08±0.07。Bland和Altman评估测量一致性方法的结果显示，平移、旋转和表面偏差的界限很窄。此外，从80个初始位置调整后的下颌最终位置完全一致。
我们的研究结果表明，使用我们的方法，数字牙模能够准确有效地调整到MI位。此外，下颌牙齿的三维表面几何形状在数字牙模咬合中比下颌牙齿的初始位置起更重要的作用。
