A Comparative Evaluation of Trueness of Two Intraoral Scanners for a Partially Edentulous Arch - An In Vivo Study

Abstract

Aim: The purpose of this in vivo study was to evaluate the trueness of two intraoral scanners, 3SHAPE TRIOS IOS and CARESTREAM CS3600 IOS in comparison with conventional elastomeric monophase vinyl polysiloxane impression and also to comparatively evaluate the accuracy of maxillary and mandibular arches when digital impressions are performed. Methods: Sixteen partially edentulous patient cases which followed the inclusion criteria were selected for the study. As a reference model, the STL (Standard Tessellation Language) file obtained by digitization of cast poured using conventional impression technique was used. As test models, the STL files obtained by two intraoral scanners were applied. Three-dimensional analyses were carried out between these three groups and the obtained deviation values were statistically analyzed using the student ‘t’ test. Results: The analysis done by student test-test showed no statistically significant differences (p=0.837) in mean X, Y, Z coordinate deviations between the 3 SHAPE TRIOS IOS® and CS3600 IOS® groups. The results showed that the mean X, Y, Z coordinate deviation in 3SHAPE TRIOS IOS group (0.001±0.008) was not statistically significant when compared to the CS3600 IOS group (0.0017± 0.11). Conclusion: 3SHAPE TRIOS® IOS showed lesser deviation when compared to CARESTREAM CS3600® IOS but there were no statistically significant differences between the two intraoral scanners. Further, it was also concluded that maxillary and mandibular arches do not show any difference in accuracy. Hence both the intraoral scanners can be used with equal efficiency for restorative procedures.