Improving the effect of NaOCl pretreatment on bonding to caries-affected dentin using self-etch adhesives

Taniguchi, Gen; Nakajima, Masatoshi; Hosaka, Keiichi; Iwamoto, Nanako; Ikeda, Masaomi; Foxton, Richard M.; Tagami, Junji

doi:10.1016/j.jdent.2009.06.005

« Previous Next »Journal of Dentistry
Volume 37, Issue 10 , Pages 769-775, October 2009

Improving the effect of NaOCl pretreatment on bonding to caries-affected dentin using self-etch adhesives

Gen Taniguchi
- Cariology and Operative Dentistry, Department of Restorative Science, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
- Corresponding author. Tel.: +81 3 5803 5483; fax: +81 3 5803 0195.
Masatoshi Nakajima
- Cariology and Operative Dentistry, Department of Restorative Science, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
Keiichi Hosaka
- Cariology and Operative Dentistry, Department of Restorative Science, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
Nanako Iwamoto
- Cariology and Operative Dentistry, Department of Restorative Science, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
Masaomi Ikeda
- Faculty of Dentistry, School for Dental Technology, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
Richard M. Foxton
- Department of Conservative Dentistry, King's College London Dental Institute at Guy's, King's College and St. Thomas’ Hospitals, King's College London, London Bridge, London SE1-9RT, UK
Junji Tagami
- Cariology and Operative Dentistry, Department of Restorative Science, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
- Global Center of Excellence (GCOE) Program, International Research Center for Molecular Science in Tooth and Bone Diseases at Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan

Received 28 January 2009; received in revised form 9 May 2009; accepted 2 June 2009. published online 17 June 2009.

Abstract

Objective

To evaluate the effect of sodium hypochlorite pretreatment on adhesion to normal and caries-affected dentin using self-etch adhesives.

Methods

Forty extracted human molars with coronal carious lesions were used in this experiment. The occlusal dentin surfaces including the caries-affected dentin in each group were treated as follows: group 1, rinsed with water; group 2, treated with 6% NaOCl for 15s; group 3, treated with 6% NaOCl for 30s; group 4, application with Accel for 30s after NaOCl-30s pretreatment. After rinsing with water and air-drying, the treated dentin surfaces were applied with self-etch systems (Bond Force and Clearfil Protect Bond) according to the manufacturers’ instructions, and built-up with resin composite. After 37°C water storage for 24h, the bonded normal or caries-affected dentin areas were isolated to create an hourglass configuration with a cross-sectional area of approximately 1mm². The specimens were subjected to tensile stress at a cross-head speed of 1.0mm/min.

Results

NaOCl-15s pretreatment significantly improved the μTBS of both self-etch adhesives to caries-affected dentin, while the 30s pretreatment did not affect them. For normal dentin, NaOCl-30s pretreatment significantly reduced the μTBS of both self-etch adhesives although the 15s pretreatment did not alter them. Furthermore, the application of Accel with a reducing effect increased the μTBS to normal and caries-affected dentin treated with NaOCl for 30s.

Conclusions

The effects of NaOCl pretreatment on bonding of both self-etch adhesives were dependent upon type of dentin (normal and caries-affected dentin) and the treatment time.

Keywords: Smear layer, Caries-affected dentin, Dentin bonding, NaOCl, Antioxidant