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 journalArticle

47 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 1 2007

Keywords

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

ASJC Scopus subject areas

  • Dentistry(all)

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