Análise da acurácia e precisão de técnicas de escaneamento digital intra oral para prótese total fixa implantossuportada

Abstract

In implantology, the IOSs (Intraoral Scanners) showed lower errors values in scanner implants in the same quadrant, but in large-scale reconstructions such as the fixed dental implant-supported prostheses, a precise transfer is required for the workflow to prevent passive adjustment inaccuracy. Purpose: Analyze the accuracy and precision of five techniques of scanning digital intraoral for the implant - supported fixed prosthesis. Materials and Methods: A mandibular master model plaster was acquired with four mini-pillars affixed in the anterior region. To allow scanning, scanning bodies were used. As the scanning of reference, the laboratory scanner Lava Scan ST was used and the data was imported to the software Geomagic Design X. Forthe scanning with IOS, the model was inserted into an opaque black methacrylate box where there were 15 scans of each of the 5 analyzed techniques (EI, Q, ST, SQ, and T) using IOS Trios 3. The normality of the data was verified by ANOVA, with p-value>0,05, followed by the Kruskal-Wallis non-parametric test and the multiple comparisons by the Wilcoxon matched-pair test, for accuracy and precision analyses . Results: After the overlapping of the images, the techniques EI and SQ demonstrated the highest accuracy, with lower areas of expansion, more present in the areas of vestibular mucosa and on the bodies of scanning , and smaller areas of contraction , in the areas near the mini-pillars . Thereafter, the highest accuracy was obtained in techniques Q, T, and ST, respectively, with no significant statistical difference between techniques EI and SQ, and between Q and T. The same result was observed for precision. Conclusion: Intraoral digital scanning techniques can interfere with the accuracy and precision when making a implant-supported fixed prosthesis and the lineares trajectories proved to be more efficient.