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

ABSTRACT

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. When the self etching adhesives are used for repair of teeth, excess etching increases the bond strength