To evaluate the effect of different surface roughness produced from diamond burs and SIC papers on micro-shear bond strength of Clearfil SE bond (SE) and Clearfil S3 bond (S3).
Method:
To analyze surface characteristic, five dentin discs were prepared by each group of diamond burs (15, 80, and 125 micron) and SIC papers (600-, 180-, and 120-grit). Control group were the surfaces prepared by metallurgical polishing. Smear layer of all tested groups were removed by brushing with soft tooth brush and subsequently ultrasonication for 45 minutes. Surface roughness and surface topography were examined by a contact stylus profilometry. Sa and Sdr were analyzed using one way ANOVA and Dunnett T3. Micro-shear bond strength of SE or S3 to each group of prepared surface were determined (n=15). Bond strength was analyzed using two way ANOVA and Duncan multiple comparison.
Result:
Metallurgical polished surface had the lowest Sa and Sdr while the highest data was the group using 125 micron diamond bur. Surface topography parameters were gradually increased according to grit size of the abrasives. All groups were demonstrated statistical significant different (p<.05). For the micro-shear bond strengths, type of adhesive and surface roughness had influence on the bond strength (p<.05). SE demonstrated higher bond strength than S3 for all surface preparations. Within each group of adhesive, the bond strength among different surface preparation were not statistically significant different but higher than that of the control group.
Conclusion:
Surface roughness had an effect on adhesion but the degree of the roughness has no influence. SE showed better bonding performance than S3.