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Updated: May 19, 2026

Accuracy in Dental Medicine, A New Way to Measure Trueness and Precision
Published on: April 29, 2014
Accuracy and reproducibility of 3-dimensional digital model measurements
Marinês Vieira S Sousa1, Eliziane Cossetin Vasconcelos, Guilherme Janson
1Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, Brazil. dra.marines@uol.com.br
Introduction:
The purpose of this study was to evaluate the reliability of measurements made on 3-dimensional digital models obtained with a surface laser scanner (D-250; 3Shape, Copenhagen, Denmark).
Methods:
Twenty orthodontic dental casts of permanent dentitions were selected. Three-dimensional images were obtained on this scanner and analyzed by using the Geomagic Studio 5 software (Raindrop Geomagic, Inc, Morrisville, NC). Measurements were made with a digital caliper directly on the dental casts and also digitally on the digital models. Fifteen anatomic dental points were identified, and a total of 11 linear measurements were taken from each cast, including arch length and width. Dependent t tests were used to evaluate intraexaminer reproducibility and measurement accuracy on the digital models.
Results:
No statistically significant differences were found between the measurements made directly on the dental casts and on the digital models.
Conclusions:
Linear measurements on digital models are accurate and reproducible. Digital models obtained with the surface laser scanner are reliable for measurements of arch width and length.
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