Análise da acurácia de modelos digitais e impressos obtidos pelas tecnologias CAD/CAM

Abstract

The use of digital workflow in Dentistry brings a new reality to obtain models, surgical guides, partial and total prosthodontics, provisional crowns, and other possibilities. There are several 3D printer systems, resins and scanners types that could obtained differences. This study was divided into five specific objectives; Specific objective 1: the purpose of this in vitro study was to evaluate the trueness and precision of 2 intraoral scanning systems operated by 3 professionals with different levels of experience and with 2 scan sizes. Specific objective 2: The purpose of this study was to evaluate and compare the accuracy of two intra-oral scanners and manufactured casts by 3D printer and conventional impression methods. Specific objective 3: The aim of this study was to evaluate and compare the accuracy of conventional and 3D printed casts using five different 3D printers. Specific objective 4: The objective of this study was to evaluate the accuracy of 3D printed models with 3 different layers thickness (25, 50 and 100 microns) and using two different resins. Specific objective 5: This study aimed to evaluate the three-dimensional positioning of dental implants in casts obtained by using conventional and digital impressions. The accuracy of intraoral scans was influenced by operator experience, type of scanners, and scan size. More experienced operators and smaller scan sizes made for more accurate scans. Different 3D printers have influence in the models’accuracy and 3D printers are more precise than cast models obtained by conventional impression. The laboratorial digital workflow could be faster according to resin and model layer chosen because the type of resin and layers did not influence the quality of the tested models. Printed models could be used for stratification of milled structures over implants.