Objectives:

To evaluate and compare the relationship between enamel bond strength and microleakage of two composite based restorative systems.

Methods:

40 third molars were randomly divided into two groups: 20 molars restored with the Adper Single bond 2 + Filtek Z250 XT (3M ESPE; ST PAUL, MN, USA) system and 20 with the Tetric N Bond + Tetric N Ceram (Ivoclar Vivadent; Schaan, Liechtenstein) system. Half of the teeth in each group were used for a bond strength test, while the other half were used for the microleakage test.

Results:

The means and standard deviation of the bond strength resistance were 27.93 (± 9.55) MPa for Adper Single bond 2 + Filtek Z250 XT system and 33.12 (± 8.18) MPa for Tetric N Bond + Tetric N Ceram system (p = 0.049). Regarding the microleakage values, there were no statistically significant differences between the groups (p = 0.478). No significant correlation was observed between Microtensile bond strength and microleakage (R2 = 0.0909, p = 0.196).

Conclusions:

It was not found a relationship between adhesive bond values and the degree of microleakage.

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