Department of Developmental and Surgical Sciences, University of Minnesota School of Dentistry, Minneapolis, Minnesota 55455, USA.
Angle Orthod. 2010 Mar;80(2):254-61. doi: 10.2319/041709-219.1.
To determine the best technique for measuring mesial-distal tooth widths on digital models.
The individual mesial-distal tooth widths were measured (first molar to first molar, maxillary and mandibular) on 32 stone casts and corresponding digital models (emodels, GeoDigm, Chanhassen, Minn). The digital models were measured using five different techniques: occlusal aspect, occlusal aspect zooming in on each individual tooth, facial aspect rotating as needed, facial aspect from three standard positions (R buccal, facial, and L buccal), and qualitatively rotating the model in any position deemed necessary. Measurements were repeated three times at least 1 week apart. The operator time needed to complete each set of measurements was recorded.
Four of five digital measurement techniques (except for the facial aspect from three standard positions) showed a slight positive bias (overestimation in measured width) compared with stone cast measurements. Measuring from the occlusal aspect resulted in the greatest Pearson correlation (98.509%), the least Altman-Bland standard deviation of differences value (1.881 mm), and the second fastest measuring time (2 minutes 3 seconds). Qualitatively rotating the model had similar Pearson correlation and Altman-Bland values to the Occlusal technique but took the longest time to measure (7 minutes 1 second).
The Occlusal measurement technique for digital models was the best combination of accuracy, repeatability, and speed of measurement.
确定测量数字模型中近远中牙齿宽度的最佳技术。
在 32 个石膏模型和相应的数字模型（emodels、GeoDigm、Chanhassen、Minn）上测量单个近远中牙齿宽度（从第一磨牙到第一磨牙，上颌和下颌）。数字模型使用五种不同技术进行测量：咬合面、每个单独牙齿的咬合面放大、根据需要旋转面、从三个标准位置（颊面 R、颊面和颊面 L）旋转面以及在认为必要的任何位置定性旋转模型。至少间隔 1 周重复测量三次。记录完成每组测量所需的操作员时间。
与石膏模型测量相比，五种数字测量技术中的四种（除了从三个标准位置的面）显示出轻微的正偏差（测量宽度高估）。从咬合面测量导致最大的 Pearson 相关系数（98.509%）、最小的差异值的 Altman-Bland 标准差（1.881 毫米）和第二快的测量时间（2 分 3 秒）。定性旋转模型与咬合技术具有相似的 Pearson 相关系数和 Altman-Bland 值，但测量时间最长（7 分 1 秒）。
数字模型的咬合测量技术是准确性、可重复性和测量速度的最佳组合。
