Veracidade do escaneamento intraoral em reabilitações implantossuportadas de arco total: efeito da esterilização de scanbodies e dos marcadores de posicionamento

Abstract

Understanding and controlling variables that affect the trueness of intraoral scanning is essential for improving the predictability of full-arch digital workflows. The overall objective of this thesis was to evaluate factors influencing the trueness of intraoral scanning in full-arch implant-supported rehabilitation. Three specific objectives were investigated. Specific objective 1: to evaluate the effect of repeated autoclave sterilization cycles on the dimensional stability, surface deviation, and marginal fit of scanbodies manufactured from different materials. Specific objective 2: to describe and clinically apply a digital workflow using 3D-printed positioning markers for bimaxillary full-arch implant-supported rehabilitation. Specific objective 3: to evaluate the effect of mucosa-supported positioning markers on the trueness of intraoral scanning in edentulous mandibles rehabilitated with full-arch implant-supported prostheses, as well as their influence on clinical procedure time and patient satisfaction. Based on the findings of these studies, it was observed that repeated autoclave sterilization cycles promoted greater surface deviation in polyetheretherketone (PEEK) scanbodies than in titanium scanbodies, although all evaluated components remained within clinically acceptable limits. The clinical application of 3D-printed positioning markers proved feasible and facilitated digital dataset alignment during complete-arch implant rehabilitation. Furthermore, the use of mucosa-supported positioning markers significantly improved the trueness of intraoral scanning when compared with conventional impressions and digital scanning without markers. Digital workflows required less clinical time and resulted in higher patient satisfaction than conventional impression techniques. The incorporation of positioning markers did not increase procedure time and did not negatively affect patient acceptance. It may be concluded that the trueness of intraoral scanning for full-arch implant-supported rehabilitation is influenced by both scanbody-related factors and scanning strategies.