Department of Dentistry, Radboud University Medical Center, Radboud Institute for Health Sciences, Nijmegen, The Netherlands.
3D Facial Imaging Research Group, Department of Oral and Maxillofacial Surgery, Radboud University Medical Center, Nijmegen, The Netherlands.
J Esthet Restor Dent. 2016 Nov 12;28(6):397-404. doi: 10.1111/jerd.12228. Epub 2016 Jun 29.
The purpose of this study was to evaluate the 3D-stereophotogrammetry technique to detect differences in facial appearance after a simulated rehabilitation.
Eleven volunteers without tooth wear participated. A 3D-stereophotograph was taken in five different situations: resting position, teeth in occlusion, and teeth in occlusion with a 1 mm-, 3 mm- or 5 mm resin block between the first molars. Cephalometric measurements were performed on the 3D-stereophotographs using the software program Maxilim (Medicim NV Mechelen, Belgium). Four anatomical parameters were analyzed: (1) Subnasale-Gnathion, (2) Subnasale-Stomion, (3) Stomion-Gnathion, and (4) Masseter right-Masseter left. A paired Student's T-test was applied to detect significant differences (p < 0.05).
Statistically significant changes in facial appearance of the lower facial height were detected in all measured positions, teeth in occlusion, 1 mm-, 3 mm-, and 5 mm block (p < 0.05). For the main distance (Subnasale-Gnathion) the mean measured differences were, respectively, 3.2 mm; 5.2 mm; and 6.7 mm.
With 3D-stereophotograph imaging technology, it was possible to detect changes in facial appearance after an artificial increase of vertical dimension of occlusion. This finding implies that reconstruction of loss of tooth substance may cause a visible change in facial appearance of the patient.
This study reveals a new 3D imaging technique that may be used for a better and more comprehensive treatment planning in patients with severe tooth wear. (J Esthet Restor Dent 28:397-404, 2016).
本研究旨在评估三维体视摄影技术在模拟修复后对面部外观差异的检测。
11 名无牙磨损的志愿者参与了这项研究。在五种不同情况下拍摄了三维体视照片：休息位、牙齿咬合位，以及在第一磨牙之间放置 1mm、3mm 或 5mm 树脂块时的牙齿咬合位。使用 Maxilim 软件程序（比利时梅切伦 Medicim NV）对三维体视照片进行了头影测量。分析了四个解剖参数：（1）Subnasale-Gnathion，（2）Subnasale-Stomion，（3）Stomion-Gnathion，和（4）右侧和左侧咬肌。应用配对学生 t 检验来检测显著差异（p<0.05）。
在所有测量位置，即牙齿咬合位、1mm 块、3mm 块和 5mm 块，均检测到下颜面高度的面部外观有统计学显著变化（p<0.05）。对于主要距离（Subnasale-Gnathion），测量差异的平均值分别为 3.2mm、5.2mm 和 6.7mm。
使用三维体视摄影成像技术，可以检测到人工增加咬合垂直距离后对面部外观的变化。这一发现表明，牙体缺损的重建可能会导致患者面部外观的可见变化。
本研究揭示了一种新的 3D 成像技术，可用于严重牙磨损患者更好、更全面的治疗计划。
