Nalcaci Ruhi, Topcuoglu Tolga, Ozturk Firat
Department of Orthodontics, Faculty of Dentistry, Suleyman Demirel University, Isparta, Turkiye.
Department of Orthodontics, Faculty of Dentistry, Gaziantep University, Gaziantep, Turkiye.
Eur J Dent. 2013 Sep;7(Suppl 1):S066-S070. doi: 10.4103/1305-7456.119077.
The aim of this study was to compare the accuracy, reproducibility, efficacy and effectiveness of measurements obtained using digital models with those obtained using plaster models.
A total of 20 digital models were produced by the Ortho Three-dimensional Models (O3DM) Laboratory and their software (O3DM version 2) was used to obtain measurements. Identical plaster models were used to obtain measurements of teeth with a vernier caliper. The maximum mesiodistal width of each study model, from first molar to first molar, was measured. All measurements were repeated at least 1 month later by the same operator for both digital and manual methods. The data were analyzed using Cronbach α, Wilcoxon signed rank test and the McNemar test.
Cronbach α value of the data at T1 and T2 for 6 anterior and 12 overall teeth measured using the two methods was very close to the ideal value of 1, indicating high intra-observer reliability. The Wilcoxon signed rank test showed statistically significant differences between the two methods (P = 0.000, P < 0.001). The measurements obtained using the digital models were lower than those obtained using the plaster models. No statistically significant differences were found between the two methods for anterior Bolton discrepancies (P = 0.375) or overall Bolton discrepancies (P = 0.00). Paired comparisons of repeated measurements for Bolton ratios showed no statistically significant differences for anterior or overall Bolton discrepancies (P = 0.688 and P = 0.375, respectively).
Use of O3DM software is an acceptable alternative to the traditional vernier caliper method in orthodontic practice.
本研究旨在比较使用数字模型获得的测量结果与使用石膏模型获得的测量结果的准确性、可重复性、有效性和效能。
正畸三维模型（O3DM）实验室制作了20个数字模型，并使用其软件（O3DM版本2）进行测量。使用相同的石膏模型，用游标卡尺测量牙齿。测量每个研究模型从第一磨牙到第一磨牙的最大近远中宽度。所有测量至少在1个月后由同一操作人员对数字和手动方法重复进行。使用Cronbach α、Wilcoxon符号秩检验和McNemar检验对数据进行分析。
两种方法测量6颗前牙和12颗全口牙齿在T1和T2时数据的Cronbach α值非常接近理想值1，表明观察者内可靠性高。Wilcoxon符号秩检验显示两种方法之间存在统计学显著差异（P = 0.000，P < 0.001）。使用数字模型获得的测量值低于使用石膏模型获得的测量值。两种方法在前牙Bolton差异（P = 0.375）或全口Bolton差异（P = 0.00）方面未发现统计学显著差异。Bolton比率重复测量的配对比较显示，前牙或全口Bolton差异均无统计学显著差异（分别为P = 0.688和P = 0.375）。
在正畸实践中，使用O3DM软件是传统游标卡尺方法的可接受替代方法。
