Effects of Time and Concentration of Sodium Ascorbate on Reversal of NaOCl-Induced Reduction in Bond Strengths

Charles H. Weston, Shuichi Ito, Bakul Wadgaonkar, David H. Pashley

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

The use of NaOCl as an endodontic irrigant lowers the bond strength of resin cements but this can be reversed by the use of 10% sodium ascorbate for 10 min. The objective of this study was to evaluate the effect of time and concentration of ascorbate at restoring the bond strength. Group 1 roots were prepared using 0.9% NaCl as an irrigant; group 2 roots were irrigated with 5.25% NaOCl; group 3 roots were irrigated with 5.25% NaOCl followed by 10% ascorbate for 10 min; group 4 roots were irrigated with 5.25% NaOCl followed by 10% ascorbate for 3 min; group 5 roots were irrigated with 5.25% NaOCl followed by 10% ascorbate for 1 min; and group 6 roots were irrigated with 5.25% NaOCl followed by 20% ascorbate for 1 min. All roots were then filled with C&B Metabond, stored 1 day in water, and then cross-sectioned into 6 slabs, 1 mm thick, that were trimmed and tested for tensile bond strength. The results demonstrated that 5.25% NaOCl irrigation produced (p < 0.05) significant reduction in resin-dentin bond strengths, but this can be reversed by 10% ascorbate treatment for 1 min.

Original languageEnglish (US)
Pages (from-to)879-881
Number of pages3
JournalJournal of endodontics
Volume33
Issue number7
DOIs
StatePublished - Jul 2007

Keywords

  • Ascorbate
  • dentin bond strength
  • intracoronal seal
  • resin cement

ASJC Scopus subject areas

  • Dentistry(all)

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