Evaluation of adhesive residues after removing metal brackets attached to a zirconium surface treated by different methods
Keywords:
zirconium_sandblasting_co2 laser_ARIAbstract
The aim of this study is to evaluate the adhesive residue index when removing metal orthodontic brackets attached to zirconium etched with a CO2 laser and by sandblasting.
Materials and methods: The research sample consisted of 20 slices of zirconia (3Y_TZP) (Zyttria, Z401white translucent, concept ®, Italy) milled by (CAD_CAM) method. After milling, all zirconia samples were sintered, a layer of glazing ceramic was applied to all slices (Glazing). The sample was divided into two equal groups randomly. In the first group, the zirconia surface was treated with a carbon dioxide laser with settings (wavelength 10.6 um and power 4w), in the second group, the surface was treated by sandblasting with aluminum oxide particles of 50 microns and a pressure of 2.5 bar at a distance of 10 mm for 30 seconds. The surface was washed with abundant water spray and the surface was dried and then Z-prime plus primer was applied according to the manufacturer's instructions. It was applied to the surface and left to dry and then the steps of sticking the brackets were completed. Then all samples were removed by Tecnotest mechanical testing device and then the samples were examined and evaluated for the adhesive residue index.
Results: Most of the bonding failure in the samples was concentrated in the area of contact of the zirconium surface with the adhesive.
Conclusions: The bonding forces (mechanical fixation) between the adhesive and the bracket base, and the internal bonding forces within the resin itself were greater Including between the resin and the zirconium surface
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