Sealing ability and bond strength of four contemporary adhesives to enamel and to dentine

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ABSTRACT

Aim

To compare the shear bond strength and microleakage of four adhesive systems to the enamel and dentine of primary
bovine teeth.

Methods

120 bovine primary mandibular incisors were collected and stored in an aqueous 1 chloramine
solution at room temperature for no longer than 3 months after extraction 80 for shear bond testing and 40 for microleakage
evaluation. The adhesives tested were Clearfil SE bond SE, Adper Prompt L Pop LP, Xeno III
XE, and Prime and Bond NT PB. For shear bond strength testing the specimens were wet ground to 600 grit SiC
paper to expose a flat enamel or dentine surface. After bonding and restoration with Dyract AP DAP), the teeth were subjected to
shear stress using a universal testing machine. For microleakage evaluation, facial class V cavities were prepared half in enamel and
half in cementum. All cavities were restored with DAP. After thermocycling and immersion in 2 methylene blue, the dye
penetration was evaluated under a stereomicroscope. STATISTICS: All data were analysed by Chi-square tests or Fisher�s tests when
adapted in order to determine the significant differences between groups. Results were considered as significant for p < 0.05. Results were analysed with an ANOVA test and a Bonferroni�s multiple comparison. The level of significance was p < 0.05.

Results

Shear
bond strength values MPa, ranged from: on enamel 11.06 to 5.34, in decreasing order SE, LP, XE and PB and on dentine
10.47 to 4.74, in decreasing order SE, XE, LP and PB. Differences in bond strengths between the four systems on enamel and dentine
were all statistically significant, excepted for XE vs LP shear bond at dentine. No significant differences were recorded in the
microleakage degree between the four adhesive systems on enamel and on dentine p > 0.0.5. CONCLUSIONS: The
highest shear bond strength was achieved by Clearfil SE bond and the lowest by Prime and Bond NT. There was no significant difference
concerning the sealing ability of the four adhesive systems.

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