Análise da acurácia de modelos e restaurações protéticas sobre implantes obtidos por tecnologia CAD/CAM

Abstract

Objectives: This study aimed to evaluate the three-dimensional positioning of dental implants in casts obtained by using conventional and digital impressions. Material and methods: A printed typodont with three digital analogues for a fixed implant-supported prosthesis was used as a master cast. On each implant, a scan body for mini abutment was fixed and scanned five times (n=5) by two different scanners and alll obtained files were printed. One cobalt-chrome metal framework was manufactured over the master cast, by a CAD/CAM system, and positioned over each cast (printed and stone cast). The accuracy of all casts was determined by measuring the vertical and horizontal misfit between the framework platform and the shoulder implant using Scanning electron microscope (SEM). Results: SEM evaluate shown not statistically differences by vertical misfit when all implant prosthetic screw was tightened for all groups. For horizontal misfit, only the control group showed statistical differences comparing one or all 3 screws tightened Conclusions: Printed models could be used for customized treatment protocol of milled structures over implants.