Avaliação multidimensional in vitro dos sistemas atuais de escaneamento intraoral: influência de diferentes condições no comportamento óptico, qualidade da malha e precisão da linha de término

Abstract

This study performed a multidimensional in vitro assessment of commercially available intraoral scanning systems (IOS), investigating the optical behavior of the devices and the quality of the generated digital meshes. In Chapter 1, seven IOS in nine configurations were characterized for irradiance, emission spectrum, beam profile, and blue-light hazard potential under two ambient light conditions and four working distances. IOS identity was the dominant source of irradiance variance (85–86%; P<0.001), with four distinct spectral groups identified independently of acquisition technology. Irradiance decreased with working distance in all systems, with decay rates varying 4.3-fold, and ambient light significantly influenced seven of the nine configurations. Blue-light hazard weighted irradiance varied 139-fold across systems. In Chapter 2, ten IOS were used to scan a standardized mandibular typodont with a full crown preparation, with quantitative and qualitative (n=10) analysis of STL meshes. Significant differences were observed for all quantitative mesh parameters (P<0.001) and for finish line accuracy (P<0.001), with TRIOS 3 and TRIOS 5 achieving the highest scores. No correlation was found between tessellation quality and finish line accuracy, evidencing a dissociation between objective mesh metrics and clinically relevant perceptual outcomes. Integrated assessment of optical, quantitative, and qualitative parameters proved essential for evidence-based IOS selection in restorative digital workflows.