Avaliação in vitro da precisão de um sistema de cirurgia guiada para a instalação de implantes

Abstract

The advent of computed tomography has allowed the development of softwares which, associated with prototyping, are used to optimize the results and reduce the surgical time. The present study aimed to analyze some aspects of computer guided surgery precision utilizing synthetic mandibles and a specific implant system. To identify the predictability of the technique and its accuracy in the transfer of virtual planning for clinical/surgical use, six polyurethane mandibles and silicone artificial gingiva were used, together with 6 individual tomographic guides. According to the technology of making Stereolithography CAD / CAM guides, together with virtual planning by using a special software, it was possible through two cone bean computed tomography scans. All guides used 4 holes for insertion of pins to stabilize and 3 holes for installation of implants with cylindrical platform morse cone. After implants installation, the mandibles were subjected to a new scan to compare their late positions with those previously projected. Aiming eliminate the possible human error, it used a computer program that automates the overlapping implant images before and after the surgery. It was an average of 2.16 ° (SD: ± 0.92) of discrepancy between the virtual and real implants positions and changes in vertical positions, concluding that was a change in their directions.