Abstract
Objective: The aim of this in vitro study was to evaluate the effect of intraoral scanner used in different preparation geometries on trueness and precision.
 Materials and Methods: Three different dental models of inlay, onlay and full crown preparation designs were used in the study. Reference scans were performed with an industrial-grade scanner (ATOS Core 80, GOM), while each model was scanned 10 times with the following intraoral scanners, respectively: Trios 4 (3Shape), Trios 3 (3Shape), Primescan (Dentsplay Sirona), Omnicam (Dentsplay) Sirona), Planmeca Emerald (Planmeca), Medit i700 (Medit Corp). All scan data were converted to STL file and saved. Then, the data were recorded in the 3D image processing software (Geomagic Control X 2020.1) and the accuracy and precision values were calculated. Shapiro Wilk, two-way ANOVA and post hoc Tukey tests were performed for statistical analysis.
 Results: Both the geometry of the preparation and the intraoral scanner used were found to be effective in the accuracy analysis. The highest accuracy values were obtained in the full crown design and with the Medit i700. The precision values of the full crown preparation were found to be higher in all intraoral scanners except Trios 4, but there was no significant difference between the scanners.
 Conclusion: It should be considered that the accuracy and sensitivity of the preparations with complex geometries may decrease depending on the intraoral scanner used.
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