Effects of Sodium Hypochlorite and RC-Prep on Bond Strengths of Resin Cement to Endodontic Surfaces

Morris, Mitzi D. DMD
Lee, Kwang-Won DDS, PhD
Agee, Kelli A. BS
Bouillaguet, Serge DDS, PhD
Pashley, David H. DMD, PhD

Dr. Morris has a private practice in Atlanta, Georgia. Dr. Lee is affiliated with the Department of Conservative Dentistry, Chonbuk University, Chonju, Korea. Dr. Bouillaguet is affiliated with the Division of Cariology, Endodontics and Pedodontics, Section of Dental Medicine, University of Geneva, Geneva, Switzerland. Dr. Pashley and Ms. Agee are affiliated with the Department of Oral Biology and Maxillofacial Pathology, Medical College of Georgia, Augusta, Georgia

Address requests for reprints to Dr. David H. Pashley, Department of Oral Biology and Maxillofacial Pathology, School of Dentistry, Medical College of Georgia, Augusta, GA 30912-1129.

This work was supported, in part, by NIDCR grant DE 06427 to DP and by grant No. 68 from the Swiss Society of Odontostomatology (SSO) to Dr. Bouillaguet.

The authors are grateful to Parkell (Farmingdale, NY) for donating the materials used in this study. The authors are grateful to Shirley Johnston and Michelle Burnside for secretarial support.

Journal of Endodontics 27(12):p 753-757, December 2001.

There is concern that the use of sodium hypochlorite (NaOCl) and RC-Prep may lower the bond strength of resin cements. The objective of this study was to evaluate the effect of 5% NaOCl and RC-Prep treatment on the bond strength of a resin cement, C&B Metabond. Control roots (group 1) were biomechanically prepared using 0.9% NaCI as an irrigant; group 2, roots with 5% NaOCl; group 3, roots with RC-Prep; group 4, roots with 0.9% NaCI followed by 10% ascorbic acid; group 5, roots with 5% NaOCl followed by 10% ascorbic acid (pH 4); group 6, roots with 5% NaOCl followed by 10% neutral sodium ascorbate; and group 7, roots with RC-Prep followed by 10% ascorbic acid. All roots were then filled with C&B Metabond, incubated in water for 24 h, and then cross-sectioned into six 1-mm thick slabs representing cervical and middle root dentin. The slabs were trimmed and tested for tensile bond strength. The results demonstrated that both 5% NaOCl and RC-Prep produced significantly (p < 0.05) large reductions in resin-dentin bond strengths, and the reductions could be completely reversed by the application of either 10% ascorbic acid or 10% sodium ascorbate.