Complete-Arch Accuracy of Four Intraoral Scanners: An In Vitro Study.

Nicola Mobilio,Francesco Grande,Massimo Corsalini,Alberto Fasiol,Giordano Celeghin,Santo Catapano,Giulio Franceschetti

doi:10.3390/healthcare9030246

Abstract

The purpose of this study is to define the accuracy of four intraoral scanners (IOS) through the analysis of digital impressions of a complete dental arch model. Eight metal inserts were placed on the model as reference points and then it was scanned with a laboratory scanner in order to obtain the reference model. Subsequently, the reference model was scanned with four IOS (Carestream 3600, CEREC Omnicam, True Definition Scanner, Trios 3Shape). Linear measurements were traced on an STL file between the chosen reference points and divided into four categories: three-element mesiodistal, five-element mesiodistal, diagonal, and contralateral measurements. The digital reference values for the measurements were then compared with the values obtained from the scans to analyze the accuracy of the IOS using ANOVA. There were no statistically significant differences between the measurements of the digital scans obtained with the four IOS systems for any of the measurement groups tested.

Highlights

One important option in the production of dental prostheses nowadays is the use of CAD/CAM technologies [1,2]
The analysis of variance (ANOVA) did not show statistically significant differences between the measurements of the digital scans obtained with Intraoral scanners (IOS) systems for any of the groups tested: mesiodistal measurements (3 elements) = F (3.24) = 1.192; p = 0.334; mesio-distal measurements
Impression taking is a crucial phase in prosthodontics—the accuracy of this process affects the quality of the final prosthesis, and in the long term its survival [5]

Summary

Introduction

One important option in the production of dental prostheses nowadays is the use of CAD/CAM technologies [1,2]. CAD/CAM technologies through digitalization of the impressions or of the final casts, achieved with the use of laboratory scanners [3]. Intraoral scanners (IOS) allow one to create, during impression taking, an STL file that is directly available to the technician. Certain limits of the conventional workflows can be overcome, such as errors in impression taking, plaster model production, storage of materials, and possible risks of cross-infection between the dental office and lab [4,5,6]. The possibility of complete digitalization of the CAD/CAM process guarantees direct access to subtractive and additive technologies [3], which allow the processing of materials in monolithic form [8]

Objectives

Results

Discussion

Conclusion