Universidade de São Paulo, Faculdade de Odontologia de Bauru, Departamento de Dentística, Endodontia e Materiais Odontológicos (Bauru/SP, Brazil).
Universidade de São Paulo, Hospital de Reabilitação de Anomalias Craniofaciais (Bauru/SP, Brazil).
Dental Press J Orthod. 2024 Mar 29;29(1):e2423217. doi: 10.1590/2177-6709.29.1.e2423217.oar. eCollection 2024.
This study evaluated the accuracy and precision of digital models acquisition using a home-built, low-cost scanning system based on the structured light method.
a plaster model (PM) was scanned using the experimental device (SL) and a dental desktop scanner (DS). The teeth dimensions of PM and SL models were measured in triplicate, with a caliper and digitally, respectively. The agreement of the measurements of each model was evaluated using the intraclass correlation coefficient, and the validity between the different measurement techniques was assessed using the Bland-Altman analysis. The accuracy and precision of the models were qualitatively investigated using the mesh superposition of the SL and DS models.
A high intraclass correlation coefficient was observed in all models (PM=0.964; SL1=0.998; SL2=0.995; SL3=0.998), and there was no statistical difference between the measurements of the SL models (p>0.05). PM and SL model measurements were found to be in good agreement, with only 3.57% of the observed differences between the same measurement being located outside 95% limits of agreement according to Bland and Altman (0.43 and -0.40 mm). In the superimpositions of SL-SL and SL-DS models, areas of discrepancy greater than 0.5 mm were observed mainly in interproximal, occlusal, and cervical sites.
These results indicate that the home-built SL scanning system did not possess sufficient accuracy and precision for many clinical applications. However, the consistency in preserving the dental proportions suggests that the equipment can be used for planning, storage, and simple clinical purposes.
本研究评估了基于结构光法的自制低成本扫描系统获取数字模型的准确性和精密度。
使用实验设备（SL）和牙科桌面扫描仪（DS）对石膏模型（PM）进行扫描。分别使用卡尺和数字方式对 PM 和 SL 模型的牙齿尺寸进行三次重复测量。使用组内相关系数评估每个模型的测量值一致性，并使用 Bland-Altman 分析评估不同测量技术之间的有效性。使用 SL 和 DS 模型的网格叠加定性研究模型的准确性和精密度。
所有模型的组内相关系数均较高（PM=0.964；SL1=0.998；SL2=0.995；SL3=0.998），并且 SL 模型的测量值之间没有统计学差异（p>0.05）。PM 和 SL 模型的测量值具有良好的一致性，根据 Bland 和 Altman 分析，只有 3.57%的相同测量值之间的观察差异位于 95%一致性界限之外（0.43 和-0.40mm）。在 SL-SL 和 SL-DS 模型的叠加中，主要在邻面、咬合面和颈面观察到差值大于 0.5mm 的区域。
这些结果表明，自制的 SL 扫描系统对于许多临床应用来说，精度和精密度不足。然而，保留牙齿比例的一致性表明，该设备可用于规划、存储和简单的临床目的。
