Immediate bond strength of one-bottle all-in-one adhesive systems to enamel/dentin

Objective: The purpose of this study was to examine the bonding efficiency of one-bottle one-step all-in-one adhesive systems to cervical enamel and dentin.

Methods: Four one-bottle one-step all-in-one adhesive systems on the market; Tokuyama Bond Force (BF, Tokuyama), Adper Easy Bond (EB, 3M ESPE), G-Bond (GB, GC) and Clearfil Tri-s Bond (TS, Kuraray), and a popular two-bottle two-step self-etching primer system; Clearfil SE Bond (SE, Kuraray, for control), were used. Standardized V-shaped cavity with a bevel at occlusal enamel was prepared in the buccocervical region of 40 extracted human premolars. The cavities were pretreated clinically with the five systems according to the manufacturer's instructions. The immediate tensile bond strength (ITBS) of the systems to the surface of beveled enamel (E, n=8) and to gingival dentin wall (D, n=8) were measured with a custom-made in vivo/vitro bi-use portable adhesion tester (JDR 75, 1996). The data were statistically analyzed using ANOVA, Tukey's q-test and student's t-test.

Results: The mean ITBS (s.d.) in MPa to E/D were BF; 21.9(5.3)/24.2(7.6), EB; 24.2(5.8)/27.5(3.8), GB; 24.8(4.0)/20.3(3.8), TS;23.9(6.0)/25.8(6.7) and SE; 30.2(4.7)/25.4(3.5). Although the ITBS was significantly influenced by the difference in systems at p<0.05, it was not influenced by the difference in tooth substance. The ITBS of four one-bottle all-in-one adhesive systems to E was significantly smaller than the value of SE at p<0.05. The ITBS of BF, EB and TS to D were similar to that of SE, and the value of GB was significantly smaller than EB and SE at p<0.05. Conclusion:The bonding efficiency of one-bottle one-step all-in-one adhesive systems in this study to E was inferior to that of SE represented as a typical two-step self-etching primer system. However the efficiency of the one-bottle all-in-one systems to D, except GB, was similar to that of SE.