Shear bond strength of one-step self-etch adhesives to enamel: effect of acid pretreatment
Poggio, C., Scribante, A., Della Zoppa, F., Colombo, M., Beltrami, R.
and Chiesa, M. (2013), Shear bond strength of one-step self-etch
adhesives to enamel: effect of acid pretreatment. Dental Traumatology.
doi: 10.1111/edt.12027
Abstract
Aim
The
purposes of this study were to evaluate the effect of surface
pretreatment with phosphoric acid on the enamel bond strength of
four-one-step self-etch adhesives with different pH values.
Material and methods
One
hundred bovine permanent mandibular incisors were used. The materials
used in this study included four-one-step self-etch adhesives with
different pH values: Adper™ Easy Bond Self-Etch Adhesive (ph = 0,8-1), Futurabond NR (ph = 1,4), G-aenial Bond (ph = 1,5), Clearfil3S
Bond (ph = 2,7). One two-step self-etch adhesive (Clearfil SE
Bond/ph = 0,8-1) was used as control. The teeth were assigned into two
subgroups according to bonding procedure. In the first subgroup (n = 50), no pretreatment agent was applied. In the second subgroup (n = 50),
etching was performed using 37% phosphoric acid for 30 s. After
adhesive systems application, a nanohybrid composite resin was inserted
into the enamel surface. The specimens were placed in a universal
testing machine (Model 3343, Instron Corp., Canton, Mass., USA). After
the testing procedure, the fractured surfaces were examined with an
optical microscope at a magnification of 10× to determine failure modes.
The adhesive remnant index (ARI) was used to assess the amount of
adhesive left on the enamel surface.
Results
Descriptive statistics of the shear bond strength and frequency distribution of ARI scores were calculated.
Conclusions
Enamel
pretreatment with phosphoric acid significantly increased bond strength
values of all the adhesives tested. No significant differences in bond
strength were detected among the four different one-step self-etch
adhesives with different pH. Two-step self-etch adhesive showed the
highest bond strength.
Comments