Comparison of Bolton analysis and tooth size measurements obtained using conventional and three-dimensional orthodontic models

Abstract

Objectives: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.Materials and Methods: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.Results: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).Conclusions:Use of O3DM software is an acceptable alternative to the traditional vernier caliper method in orthodontic practice.

Hypodontia of mandibular incisors: considerations on the orthodontic treatment

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Accuracy of Bolton analysis measured in laser scanned digital models compared with plaster models (gold standard) and cone-beam computer tomography images

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A review of computer-aided design/computer-aided manufacture techniques for removable denture fabrication

“…[33] The precision of digital impression has been studied by several researchers and found out that use of digital models is a relatively new technique that has an accuracy of up to 10 µm, and the models have been found to be as reliable as traditional stone casts. [34] Nalcaci et al [35] found out statistically significant differences between measurements obtained for width of 6 anterior teeth and 12 overall teeth using plaster and digital models; however, these differences were not within the clinically significant range (~0.27-0.30 mm). Therefore, casts are scanned using digital scanner for conventional technique.…”