Objective: to analyze a new self-etching adhesive containing an antibacterial agent by means of microtensile bond strength (MTS) and SEM evaluation.

Methods: Non-carious primary human molars were etched with antibacterial self-etching primer(ABF experimental system – Kuraray), conventional self-etching primer(Clearfil SE Bond - Kuraray) and 35% phosphoric acid (3M-ESPE) for SEM (JEOL 5600 LV) evaluation of enamel surface. Enamel was rinsed with acetone and ethanol in order to remove the self-etching primer. Bonded specimens were prepared for interface evaluation. Teeth were treated with ABF, SE and phosphoric acid/Single Bond (3M-ESPE) according to manufacturer's directions and restored with Z-250 (3M-ESPE). For MTS test, teeth (n=5) were bonded as described, sectioned into slices, trimmed to a glass-hour shape (average bonded area of 0,7 mm²) and stressed to failure. Data were analyzed by one-way ANOVA and Tukey test (p<0.05).

Results: No significant difference between ABF and SE Bond was observed with respect of MTS and microstructure. Both self-etching primers produced relatively shallow etching effect on enamel surface. Phosphoric acid produced several etching patterns at enamel surface and superior MTS values.

Conclusion: The incorporation of antibacterial agent in conventional self-etching primer did not negatively affect the MTS and morphological features in primary intact enamel.

Adhesive system	MTS [Mean(SD)]
ABF experimental system	15.73(2.12)a MPa
Clearfil SE Bond	15.36(4.32)a MPa
Single Bond	27.83 (5.47)b MPa

Groups identified with the same subscripts are not significantly different (p<0.05)

Supported by CAPES

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