Virtual models as an alternative approach to plaster model assessment of tooth dimension

Abstract

AIM: A case-control study to assess the potential use of virtual models as an alternative to orthodontic plaster models. MATERIALS AND METHOD: Assessment of tooth widths was conducted on 80 plaster models, which were measured to the nearest 0.01 mm with digital callipers, and their virtual models by two trained and calibrated examiners. Agreement of tooth width was assessed with paired t-test analysis. Intra- and interexaminer reliability of assessments were investigated. RESULTS: Both intra- and interexaminer reliability and test-retest reliability of plaster and virtual model analysis were acceptable in measuring tooth sizes. There were no signifi cant differences between measurements of 24 teeth on the plaster and virtual models. The mean directional differences (MDD) were less than 0.20 mm. The MDD for tooth width measurements was less than 0.10 mm. Intraclass correlation coeffi cients of assessments of tooth width obtained from plaster and virtual models were >0.80. CONCLUSIONS: Virtual models can be as accurate as the traditional method of digital callipers and plaster models. Therefore, virtual models can be used as an alternative to plaster models.