Dimensional Accuracy Between Three Different Indirect Scanners For CAD/CAM Systems - An In-vitro Study

Objective: Extraoral scanning is considered an alternative for conventional work flow of crown and bridge framework. The purpose of this study is to compare the accuracy of three different indirect scanners (Sirona Ineos x5, 3 shape D800, D of Freedom hd) for CAD/CAM systems with different arrangement of restored dentition(single crown, multiple crowns, simple bridge). The hypotheses was that different arrangement of restored dentition will affect the accuracy of different scanning systems.   
Materials and methods: In this study, three different arrangement of restored dentition (single crown, simple bridge and multiple crowns) were scanned by CMM and three different extraoral scanners (Dof, 3 Shape and Sironoa) to get 45 STL files. These STL files were compared to measure accuracy (trueness and precision) by an analyzed specific software (poly works). 
Results: The analysis revealed statistically non- significant differences in precision and trueness between the three different scanners.
Conclusion: Within the limitations of this study, the following recommendations can be made: The analysis revealed statistically a non- significant difference in precision and trueness between the three different scanners.