Effect of polymerization accelerator on bond strength to eugenol-contaminated dentin

Rutthanun Wongsorachai, Ornnicha Thanatvarakorn, Taweesak Prasansuttiporn*, Sumana Jittidecharaks, Keiichi Hosaka, Richard M. Foxton, Masatoshi Nakajima

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Purpose: To evaluate the effect of a polymerization accelerator on the microtensile bond strength (μTBS) of etchand- 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 twostep 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.

Original languageEnglish
Pages (from-to)541-547
Number of pages7
Issue number6
Publication statusPublished - 1 Jan 2018


  • Adhesive resin
  • Bond strength
  • Eugenol
  • Polymerization accelerator

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