Influência de diferentes fresadoras na adaptação passiva de infraestruturas em zircônia implanto-suportadas confeccionadas pelo sistema cad/cam

Abstract

Different open software’s and all data acquisition obtained by scanning could be sent to milling centers. It is not clear if different milled could have some influence on fit accuracy. The purpose of this study was to compare the fit accuracy of CAD/CAM-fabricated zirconia frameworks using two different milling and the same scanner by scanning electron microscopy (SEM). Ten 3-unit implant-supported, screw-retained frameworks were fabricated to fit a mastermodel. Five frameworks for each group were fabricated using Dental Wings scanner and two milling unit: Amanngirbach and Ultra Sonic 20 Linear. The vertical and horizontal misfit at the abutment-framework interface (mesial and distal of all implants) were measured by SEM resulting in 60 measurements divided into vertical and horizontal (n=30) when only 1 screw was tightened and after all screws were tightened. The statistical analysis was performed using Mann-Whitney test (=.05) by vertical misfit. Horizontal misfit values were separated in three categories: underextension, equally extended and overextension. Significant difference was found between the fit accuracy of the two groups when all screws were tightened, however all vertical values were below 16 µm. Five and eighteen horizontal misfit were found in, Ultra Sonic 20 Linear and Amanngirrbach, respectively. The use of different scanners/software have influence on fit accuracy.