Zotti Francesca, Rosolin Luca, Bersani Massimo, Poscolere Andrea, Pappalardo Davide, Zerman Nicoletta
Department of Surgical Sciences, Paediatrics and Gynecology, University of Verona, 37134 Verona, Italy.
Private Practice, 37134 Verona, Italy.
Dent J (Basel). 2022 Feb 7;10(2):24. doi: 10.3390/dj10020024.
3D models are nowadays part of daily clinical practice. Photogrammetry is a brand-new method for transforming small objects into 3D models while keeping their original shape and size. The aim of this study was to evaluate the accuracy, in terms of precision and trueness, of a digital dental model acquired with photogrammetry compared with those obtained using extraoral scanners and intraoral scanners, starting from the same plaster model.
A plaster model was converted into a digital model using photogrammetry, an extraoral scanner and an intraoral scanner. Different references were measured twice at a distance of 30 min for each model, on the digital models using the software Blender and on the plaster model using a calibre. The Interclass Correlation Coefficient was calculated for each pair of measurements. A volumetric analysis was performed by superimposing the digital models. The coefficient of variation was calculated. A two-way ANOVA test was conducted.
For each reference, the coefficient of variation was less than 3%, and the two ANOVA tests resulted in a non-significant value in both cases ( > 0.05). The volumetric analysis demonstrated good agreement between the models derived from the different acquisition methods.
Photogrammetry seems to be a good method for acquiring digital models starting from a plaster model, all the methods tested seem to be good for obtaining an accurate three-dimensional digital model. Other studies are needed to evaluate clinical efficacy.
如今，3D模型已成为日常临床实践的一部分。摄影测量法是一种全新的方法，可将小物体转换为3D模型，同时保持其原始形状和大小。本研究的目的是从同一个石膏模型开始，评估通过摄影测量法获取的数字牙科模型在精度和真实性方面的准确性，并与使用口外扫描仪和口内扫描仪获得的模型进行比较。
使用摄影测量法、口外扫描仪和口内扫描仪将石膏模型转换为数字模型。在每个模型上，每隔30分钟对不同的参考点进行两次测量，在数字模型上使用Blender软件，在石膏模型上使用卡尺。计算每对测量值的组内相关系数。通过叠加数字模型进行体积分析。计算变异系数。进行双向方差分析测试。
对于每个参考点，变异系数均小于3%，并且两次方差分析测试在两种情况下均得出无显著意义的值（>0.05）。体积分析表明，不同采集方法得到的模型之间具有良好的一致性。
摄影测量法似乎是一种从石膏模型获取数字模型的好方法，所有测试方法似乎都有利于获得准确的三维数字模型。需要进行其他研究来评估临床疗效。
