Effect of Imaging Powders on the Bond Strength of Resin Cement
Uniformed Services University Of The Health Sciences Bethesda United States
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The application and incomplete removal of a CADCAM imaging powder may affect the dentin surface prior to bonding a ceramic restoration. The purpose of this study was to compare the effect of imaging powder residue on the shear-bond strength of a self-adhesive resin cement to dentin. Mounted human third molars were sectioned coronally with a diamond saw to expose dentin and prepared with a diamond bur mounted in a custom jig. The dentin surface was sprayed with three different imaging powders. The powders were treated in three different modes no rinse, 1-second rinse, and 10-second rinse of water. A control group was also created with no application of imaging powder. A self-adhesive resin cement was bonded to the surface and loaded to failure in a universal testing machine after 24 hours of storage. Data was analyzed with Kruskal-WallisMann-Whitney non-parametric tests. The dentin surfaces rinsed for one or ten seconds were not significantly different from the control or from each other. The type of imaging powder did not significantly affect the bond strength. The non-rinsed powdered dentin surface had a significant reduction in bond strength compared to the control or the rinsed powdered surfaces.