Análise da influência do material dos corpos de escaneamento e da presença de defeitos no seu escaneamento sobre acurácia de modelos digitais: um estudo in vitro

Abstract

Introduction: Some clinical situations may make it difficult to capture the entire surface of the scanbody. Furthermore, different materials may offer different optical features for image capture by dental scanners. However, the influence of such factors is still unclear. Objective: The purpose of this in vitro study was to evaluate the influence of the material of the scanbodies and the presence of defects in the scan on the accuracy of these images. Material and methods: Two different scanbody materials (PEEK and Titanium) were used to generate models with and without defects on the lingual surface of the devices. For this, each group was scanned 12 times (N=48) with the Virtuo Vivo intraoral scanner. Then the files were examined for trueness and precision analyses. For trueness, the files of each group were compared to a master file generated by another scan of the master model with the laboratory scanner InEos X5. These analyzes were carried out in the Geomagic Control software, which allows the pairing, overlapping and 3D comparison of the files. Reproducibility data were submitted to the Kruskal-Wallis test, in addition to multiple comparisons performed using the Dwas-Steel-Critchlow-Fligner test. Next, the veracity data were submitted to the ANOVA test followed by the Tukey test. Results: Regarding reproducibility, there was a significant difference, with the PEEK group with error having the lowest level of discrepancy in relation to the other groups (P= .003). Regarding veracity, there was a significant difference considering the presence of error (groups with error had less discrepancy), while, according to the material variable, there was no significant difference. In this context, the groups Titanium with error (5.40) and PEEK with error (4.81) showed a significant difference when compared to the other groups (P< .001). Conclusions: The accuracy of the scan files was significantly influenced by the presence of errors in the acquisition of images of the scanbodies, in this context, files without errors had lower accuracy. With regard to the material, there was no significant influence with the use of PEEK or Titanium on the accuracy parameters.