Shear Bond Stability of Current Adhesive Systems on Enamel

Purpose: The purpose of this study was to evaluate the micro-shear bond strength to human enamel of two commercially available resin bonding systems. Materials and method: Two commercially available resin bonding systems, a self-etching primer system (Clearfil SE Bond Kuraray, SE) and a single-bottle adhesive system (Single Bond, 3M, SB) used with a total-etch wet bonding technique were tested. The bond strengths were measured by means of micro-shear bond test at 1 day, 1 week, 1 month, 3 month, 6 months, and 1 year. The data was analyzed by Two-Way ANOVA and Fisher's PLSD tests at 95% level of confidence. Results: Mean and SD in MPa are shown below (n = 10).

The highest bond strengths were achieved at 1 day with SE and SB. For SB, from 1 month to 1 year, the bond strength dramatically decreased (p<0.05) and there was no difference on bond strength among these storage times (p>0.05). For SE, the decreased of bond strength was gradual. After 1 year-storage, the bond strength drastically decreased (p<0.05) and this value was not significantly different from the results of 1 year-storage of SB (p>0.05). Conclusions: It was concluded that the bond strength of both materials decreased with time, SE showed the highest bond strengths, except at 1 day and 1 year, when it was not different from the SB result.