• Chuthinat Intakanok D.D.S.
• Sirivimol Srisawasdi, D.D.S., M.S., Ph.D.

Objective To evaluate microleakage of class V resin composite restorations when using three resin
adhesives according to manufacturers' instructions compared to the modified application protocols.

Materials and methods Standard class V cavities were prepared in 60 human extracted premolars.
Three adhesives were investigated; Optibond FL, Clearfil SE Bond and Clearfil S³ Bond. Adhesives
used according to manufacturers' instructions were used as controls, compared to groups using
modified application protocols. After 5,000 thermal cycles, microleakage test was performed and the
results were analyzed using Chi-Square and Wilcoxon Signed Rank tests at a 95% confidence level.

Results Clearfil SE Bond samples exhibited lower enamel leakage values, compared to controls,
when beforehand enamel was etched with phosphoric acid; however, no statistically significant
difference was shown. Leakage of Clearfil S3 Bond at enamel margin of the modified protocol
group was found to be statistically lower than the control group. Modified application of Optibond
FL presented less leakage at dentin margin, compared to control group, significantly.

Conclusion There was no difference in leakage prevention at enamel margin of Clearfil SE Bond
when used according to manufacturersû instructions compared to the modified protocol. In contrast to
Clearfil S3 Bond, leakage was found to be significantly lower in group that enamel was beforehand
etched compared to that found in group using the manufacturersû protocol. Optibond FL group
showed significant less leakage when dentin was only treated with primer.

(CU Dent J. 2009;32:23-38)