J Korean Acad Prosthodont.  2020 Oct;58(4):282-289. 10.4047/jkap.2020.58.4.282.

Evaluation of the accuracy of three different intraoral scanners for endocrown digital impression: An in vitro study

• Ural
• Park JM
• Kaleli N
• Çağlayan E

• KMID: 2508357
• DOI: http://doi.org/10.4047/jkap.2020.58.4.282

Abstract

Purpose
The aim of this in vitro study was to evaluate the accuracy of three different intraoral scanners (IOSs) on digital impressions of different types of endocrown cavity preparations.
Materials and methods
Two human mandibular molar teeth were prepared with different endocrown abutment designs: one with a buccal wall (Class 2) and the other without a buccal wall (Class 3). Both cavity designs were scanned using a reference desktop scanner (E3) and three different intraoral scanners: Trios3 (TRI group), Cerec Omnicam (CER group), and i500 (I5 group). The obtained Standard Tessellation Language (.stl) datasets were exported to metrology software. The precision was evaluated based on deviations among repeated scan models recorded by each IOS. The trueness was evaluated based on deviations between the reference data and repeated scans. For detecting interaction, data were statistically analyzed using a univariate analysis of variance (ANOVA) and for analyzing the comparison of the test groups data were analyzed by one-way ANOVA and post-hoc Tukey test at the significance level of .05.
Results
The deviation values for both cavity designs in the I5 group were significantly lower than those in the other IOS groups in terms of trueness. For both cavity designs, the TRI group exhibited better precision than the other IOS groups.
Conclusion
Different technologies of IOS device's and different endocrown prepration designs affected the accuracy of the digital scans.

Keyword

Cavity design; Endocrown; Intraoral scanners; Precision; Trueness