Shear bond strength of self-etch and total-etch adhesives to bovine enamel and dentin

purpose: to evaluate the shear bond strength of a self-etch adhesive and an etch-and-rinse adhesive when bonded to bovine enamel and dentin. methods: the labial surfaces of 28 bovine mandibular incisors were wet ground to achieve a flat enamel or dentin surface. a 1-step self-etch adhesive and a 3-step etch-and-rinse adhesive were bonded to enamel or dentin according to the manufacturer's instructions (adper easy one and adper scotchbond, respectively). a composite resin cylinder (filtek z350 xt) was built upon the adhesive layer using a silicon mold (2 mm in diameter × 3 mm high). the specimens were stored in 37°c distilled water for 24 h. the bond strength was measured by a universal testing machine at a crosshead speed of 1.0 mm/min. student's t-test was used to compare bond strength values between adhesives at the 95% confidence level. results: for the enamel specimens, adper scotchbond had significantly higher values of bond strength than adper easy one (p=0.007). for the dentin specimens, there were no statistically significant differences between adhesives (p=0.12). conclusion: adper easy one showed lower shear bond strength than adper scotchbond on enamel. for dentin, adper easy one showed bond strength similar to adper scotchbond.