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KMID : 0361920160460010003
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Korean Journal of Orthodontics
2016 Volume.46 No. 1 p.3 ~ p.12
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A comparison of the precision of three-dimensional images acquired by 2 digital intraoral scanners: effects of tooth irregularity and scanning direction
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:Anh Ji-won
:Park Ji-Man/:Chun Youn-Sic/:Kim Mi-Ae/:Kim Min-Ji
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Abstract
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Objective: The purpose of this study was to compare the precision of threedimensional (3D) images acquired using iTero® (Align Technology Inc., San Jose, CA, USA) and Trios® (3Shape Dental Systems, Copenhagen, Denmark) digital intraoral scanners, and to evaluate the effects of the severity of tooth irregularities and scanning sequence on precision.
Methods: Dental arch models were fabricated with differing degrees of tooth irregularity and divided into 2 groups based on scanning sequence. To assess their precision, images were superimposed and an optimized superimposition algorithm was employed to measure any 3D deviation. The t-test, paired t-test, and one-way ANOVA were performed (p < 0.05) for statistical analysis.
Results: The iTero® and Trios® systems showed no statistically significant difference in precision among models with differing degrees of tooth irregularity. However, there were statistically significant differences in the precision of the 2 scanners when the starting points of scanning were different. The iTero® scanner (mean deviation, 29.84 ± 12.08 μm) proved to be less precise than the Trios® scanner (22.17 ± 4.47 μm).
Conclusions: The precision of 3D images differed according to the degree of tooth irregularity, scanning sequence, and scanner type. However, from a clinical standpoint, both scanners were highly accurate regardless of the degree of tooth irregularity.
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KEYWORD
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Three-dimensional scanner, Digital models, Dental cast analysis, Three-dimensional diagnosis and treatment planning
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