Efeito do processo de autoclavagem em transferentes de escaneamento intraoral confeccionados em diferentes materiais: estudo in vitro

Abstract

This in vitro laboratory study evaluated the effect of the autoclaving process on intraoral scanbodies made from different materials (Titanium and PEEK), positioned at the implant and abutment levels (N=10). Analyses were conducted at five distinct time points: T0 (control group with new scanbodies), T1 (after one autoclaving cycle), T2 (10 cycles), T3 (50 cycles), and T4 (100 cycles). Forty scanbodies divided into 4 groups (N=10 each) were fixed according to the initial positioning, with the torque recommended by the manufacturer, and scanned 10 times using the InEOS X5 bench scanner (Dentsply Sirona). Surface deformation was evaluated by STL mesh overlay using Geomagic Control X software. Microscopic analyses of marginal adaptation were performed at the same time points as the digital analysis using a MitutoyoTM500 Optical Microscope with 4.5x magnification, on 4 faces of the junction. Statistical analysis was performed using SPSS 29.0 softwares, with α=0.05. Data were subjected to the Shapiro-Wilk normality test. To assess spatial variation after the cycles, Repeated Measures ANOVA with Bonferroni correction was used. For microscopic qualitative analysis, Percentile was used to check the prevalence of clinically adapted and misfitting faces. The null hypothesis of this study was rejected. Statistically significant differences in mesh deformation were detected, with PEEK scanbodies showing greater deformation compared to Titanium scanbodies, especially at the abutment level, after 100 cycles (P<0.01). Microscopic analysis revealed that 100% of the faces were classified as “Clinically Adapted” by the three calibrated evaluators (KAPPA > 0.08). The accuracy of scanning directly depends on a good overlap between the physical scanbody, which produces the STL file, and the virtual model. Any alteration in its surface or macrogeometry can cause variations in the digital model and compromise the feasibility of virtually planned CAD/CAM works.