Reliability evaluation of 3-D models when compared with plaster models for mixed dentition analysis

Abstract

AIM: Inclination towards digital models in orthodontics is increasing and several software programs are available to perform virtual model analyses for diagnosis & treatment planning. The aim of this study was to compare as well assess the accuracy and validity of 3D models over plaster casts for mixed dentition analysis. MATERIALS AND METHODS: This prospective cross-sectional study was conducted on 16 children from the age group of 8-13 years with mixed dentition. Intraoral scanning using a 3D scanner (MEDIT) to generate digital models of the upper and lower arches, then alginate impressions were taken and models poured. Mixed dentition model analysis, specifically Moyers and Tanaka Johnston analysis, were performed with measurements made on both plaster models using digital vernier calipers and digital models. Obtained data was statistically analyzed using SPSS software (IBM corp, version 13). RESULTS: Statistical analysis of the data comparison between digital and plaster models of both Moyers and Tanaka Johnston mixed dentition analysis gave us a ‘p’ value greater than 0.05 hence proving the null hypothesis. CONCLUSION: When analysing mixed dentition, virtual models are 95% as accurate as plaster models.