Department of Prosthodontics, The First Affiliated Hospital of Xinjiang Medical University, Urumqi 830054, Xin Jiang Uygur Autonomous Region, China; Affiliated Stomatological Hospital of Xinjiang Medical University, Urumqi 830054, Xin Jiang Uygur Autonomous Region, China; Stomatology Research Institute of Xinjiang Uygur Autonomous Region. Urumqi 830054, Xin Jiang Uygur Autonomous Region, China.
Department of Microrepair and Reconstruction, The First Affiliated Hospital of Xinjiang Medical University, Urumqi 830054, Xin Jiang Uygur Autonomous Region, China.
Arch Oral Biol. 2021 Apr;124:105059. doi: 10.1016/j.archoralbio.2021.105059. Epub 2021 Jan 23.
In orthodontics and prosthodontics fields, it is often necessary to measure the crown dimensions of patient's teeth for further diagnosis and treatment. This study aims to assess the reliability and validity of dental measurements by comparing three-dimensional (3D) measurement of digital model derived from 3D handheld scanner with electronic digital caliper measurement of plaster model, providing a promising technology for dentistry.
The mesiodistal diameter, buccolingual diameter and clinical crown height of 2800 teeth were measured on 100 sets of maxillary and mandibular dental plaster models as well as on the corresponding 3D digital models obtained by structured light scanning of the plaster models. Each measurement was performed twice by qualified operators and averaged. Twenty sets of maxillary and mandibular dentition models were randomly selected for intra and inter observer errors. The reliability was evaluated by intraclass correlation coefficient (ICC). Bland-Altman analysis was utilized to evaluate the validity of methods.
Excellent reliability (ICC > 0.75) of intra and inter observer on traditional and digital methods were exhibited. Bland-Altman analysis showed the largest difference was the mesiodistal diameter (170/2800), and the smallest (130/2800) was the clinical crown height. Compared with other teeth, buccolingual diameter of incisors and molars, mesiodistal diameter and clinical crown height of premolars and molars displayed relative differences. The mean biases were close to zero, upper and lower 95 % limits of agreement were within 0.5 mm.
Linear measurements obtained from 3D technique are consistent with the conventional method. The 3D technology can be clinically accepted and suitable for dental metrology.
在正畸学和修复学领域，经常需要测量患者牙齿的冠部尺寸，以进行进一步的诊断和治疗。本研究旨在通过比较 3D 手持扫描仪获得的数字模型的三维（3D）测量与石膏模型的电子数字卡尺测量，评估牙科测量的可靠性和有效性，为牙科提供一种有前途的技术。
对 100 个上颌和下颌牙石膏模型以及相应的通过对石膏模型进行结构光扫描获得的 3D 数字模型中的 2800 颗牙齿进行近远中径、颊舌径和临床冠高的测量。每个测量值由合格的操作人员进行两次测量并取平均值。随机选择 20 个上颌和下颌牙列模型进行观察者内和观察者间误差。采用组内相关系数（ICC）评估可靠性。采用 Bland-Altman 分析评估方法的有效性。
传统和数字方法的观察者内和观察者间均显示出极好的可靠性（ICC>0.75）。Bland-Altman 分析显示最大差异为近远中径（170/2800），最小差异为临床冠高（130/2800）。与其他牙齿相比，切牙和磨牙的颊舌径、前磨牙和磨牙的近远中径和临床冠高显示出相对差异。平均偏差接近零，上下 95%一致性界限在 0.5mm 以内。
3D 技术获得的线性测量值与传统方法一致。3D 技术可在临床上被接受，适用于牙科计量学。
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