Resumo

RESTREPO, Manuel et al. Comparison of dental and transversal measurements made on plaster model using a digital caliper and in digital model using the o^3d software. CES odontol. [online]. 2015, vol.28, n.2, pp.58-68. ISSN 0120-971X.

Abstract Introduction and objetive: Measurements and analyses of dental casts are essential for precise diagnosis of an orthodontic case. At present, analyses of dental casts can be performed virtually, through computer software as o^3d. The aim of this study was to evaluate the reproducibility, reliability and validity of measurements made in digital models using the o^3d software compared to plaster models. Materials and methods: Thirty pair of plaster casts were scanned and digitized. Two examiners measured tooth size, intercanine distance and intermolar distance in a plaster model with a digital caliper and in a digital model using the o^3d software system. The data were statistically analyzed by Intraclass Correlation Coefficient test, paired samples t test, Dahlberg's formula and analysis of variance. Results: Excellent intraexaminer and interexaminer agreement was observed in the measurments performed with digital caliper and o^3d software. No random error was present in the measurements obtained with the digital caliper and o^3d software; systematic error was more frequent in the digital casts. Conclusion: The o^3d software presented a good performance in terms of reproducibility, reliability and validity in measuring tooth size and transverse distance. Although measurements made on plaster and digital models showed statistically significant differences, the magnitude of the differences does not appear to be clinically relevant.

Palavras-chave : Dental models; orthodontics; reproducibility of results; validity of tests.

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