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The Journal of Adhesive Dentistry
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J Adhes Dent 20 (2018), No. 6     28. Dec. 2018
J Adhes Dent 20 (2018), No. 6  (28.12.2018)

Page 541-547, doi:10.3290/j.jad.a41631, PubMed:30564801


Effect of Polymerization Accelerator on Bond Strength to Eugenol-Contaminated Dentin
Wongsorachai, Rutthanun / Thanatvarakorn, Ornnicha / Prasansuttiporn, Taweesak / Jittidecharaks, Sumana / Hosaka, Keiichi / Foxton, Richard M. / Nakajima, Masatoshi
Purpose: To evaluate the effect of a polymerization accelerator on the microtensile bond strength (µTBS) of etch-and-rinse and self-etch adhesives to eugenol-contaminated dentin.
Materials and Methods: Sixty flat dentin surfaces were prepared from human molars. Half of the specimens were restored with zinc oxide eugenol temporary cement (IRM) (eugenol-contaminated group) and the other half remained without restoration (control group). After 24-h storage, the cement was mechanically removed. Then the specimens in each group were further divided into three subgroups based on the application procedure of a polymerization accelerator (p-toluenesulfinic acid sodium salt; Accel): no application, 10-s application, or 30-s application. After air drying, the dentin surfaces were bonded with either a three-step etch-and-rinse adhesive (OptiBond FL) or a two-step self-etch adhesive (Clearfil SE Bond) and restored with composite. After 24-h water storage, the bonded specimens were subjected to the µTBS test. Data were analyzed by three-way ANOVA and Dunnett's T3 test (p < 0.05).
Results: The eugenol-contaminated groups had significantly lower µTBS than the control groups with both types of adhesives (p < 0.05), and the application of Accel significantly increased the compromised µTBS to eugenol-contaminated dentin. Optibond FL presented significantly higher µTBS to eugenol-contaminated dentin than did Clearfil SE Bond (p < 0.05).
Conclusion: The application of a polymerization accelerator on eugenol-contaminated dentin prior to adhesive resin application increased the μTBS of both the three-step etch-and-rinse and two-step self-etch adhesive.

Keywords: eugenol, polymerization accelerator, adhesive resin, bond strength