EVALUATION OF ADHESIVE SYSTEMS USING ACIDIC PRIMERS

Purpose: To evaluate in vitro the dentin and enamel shear bond strengt h of two adhesive systems that contain acidic primers. Materials and M ethods: Clearfil Liner Bond 2 (CLB2) and Denthesive II (DTII), contain ing acid primers were used with (ETCH) and without (NOET) etching. Sco tchbond Multi-Purpose (SBMP) was utilized as a control. Sixty flat ena mel and dentin bonding sites were prepared to 600 grit on extracted hu man molars. Both acidic primer systems were used with (ETCH) and witho ut etching (NOET) for both enamel and dentin surfaces. The control gro up used etching only. After applying primer and adhesive, a microfill composite (Silux Plus) was placed in a 2.5 mm diameter matrix on the t ooth surface, and polymerized for 40 seconds. All specimens were therm ocycled 500 times. Shear bond strengths were determined using a Zwick testing machine. Results: One-way ANOVA revealed significant differenc es among groups for enamel (P=0.0001) and dentin (P=0.0002). Duncan's multiple range test (alpha = 0.05) revealed that enamel shear bond str ength of DTII-ETCH was equal to that of CLB2-NOET and these were signi ficantly greater than CLB2-ETCH, SBMP and DTII-NOET. For dentin, bond strengths for CLB2-ETCH and CLB2-NOET were significantly greater than DTII-NOET.