Experimental comparison of shear bond strength of a self - etch adhesive system by three dentin conditioning methods

The aim of this study was to evaluate the bond strength of self- etch adhesive system (AdheSE) with three dentin conditioning methods. Sixty six human intact premolar was divided into 3 group (n=22), a flat dentin surface was made. In group 1: The tooth was etched by phosphoric acid (%35), then bonding material of AdheSE was used. In group 2: only bonding material was used. In group 3: The procedure was as the first group, but after etching, the tooth surface was deproteinized by Naocl (%5). Then with a cylindrical composite models were made. Thermolcycling was performed using 500 cycle, and subjected to a blade (cross head) with the speed of 0.5 mm / min. Collected data was analyzed using 1 way ANOVA test in addition to a Duncan test. Results revealed that hypochlorite sodium (Naocl) decreased the bond strength. when acid phosphoric and then dentin bonding agent were used, mean bond strength (25.72 MPa) was the most. Excess etching increases the bond strength.Conclsion: When the self etching adhesives are used for repair of teeth, excess etching increases the bond strength.