دانلود گزارش کارورزی و کار آموزی

چکیده : 

This study evaluated the influence of deposition parameters for Si-based thin films using magnetron

sputtering for coating zirconia and subsequent adhesion of resin cement. Zirconia ceramic blocks were

randomly divided into 8 groups and specimens were either ground finished and polished or conditioned

using air-abrasion with alumina particles coated with silica. In the remaining groups, the polished specimens

were coated with Si-based film coating with argon/oxygen magnetron discharge at 8:1 or 20:1 flux.

In one group, Si-based film coating was performed on air-abraded surfaces. After application of bonding

agent, resin cement was bonded. Profilometry, goniometry, Energy Dispersive X-ray Spectroscopy

and Rutherford Backscattering Spectroscopy analysis were performed on the conditioned zirconia surfaces.

Adhesion of resin cement to zirconia was tested using shear bond test and debonded surfaces were

examined using Scanning Electron Microscopy. Si-based film coating applied on air-abraded rough zirconia

surfaces increased the adhesion of the resin cement (22.785.2 MPa) compared to those of other

methods (0–14.62 MPa) (). Mixed type of failures were more frequent in Si film coated groups on

either polished or air-abraded groups. Si-based thin films increased wettability compared to the control

group but did not change the roughness, considering the parameters evaluated. Deposition parameters

of Si-based thin film and after application of air-abrasion influenced the initial adhesion of resin cement

to zirconia.