NaOCl degradation of a HEMA-free all-in-one adhesive bonded to enamel and dentin following two air-blowing techniques

De Munck, Jan; Ermis, R. Banu; Koshiro, Kenichi; Inoue, Satoshi; Ikeda, Takatsumi; Sano, Hidehiko; Van Landuyt, Kirsten L.; Van Meerbeek, Bart

doi:10.1016/j.jdent.2006.05.001

« Previous Next »Journal of Dentistry
Volume 35, Issue 1 , Pages 74-83, January 2007

NaOCl degradation of a HEMA-free all-in-one adhesive bonded to enamel and dentin following two air-blowing techniques

Jan De Munck
- Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-facial Surgery, Catholic University of Leuven, Belgium
- Department of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Kita 13 Nishi 7, Kita-ku, Sapporo 060-8586, Japan
- Corresponding author at: Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-facial Surgery, Catholic University of Leuven, Kapucijnenvoer 7, 3000 Leuven, Belgium. Tel.: +32 16 33 26 16; fax: +32 16 33 27 52.
R. Banu Ermis
- Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-facial Surgery, Catholic University of Leuven, Belgium
- Suleyman Demirel University, School of Dentistry, Department of Restorative Dentistry & Endodontics, Isparta, Turkey
Kenichi Koshiro
- Department of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Kita 13 Nishi 7, Kita-ku, Sapporo 060-8586, Japan
Satoshi Inoue
- Department of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Kita 13 Nishi 7, Kita-ku, Sapporo 060-8586, Japan
Takatsumi Ikeda
- Department of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Kita 13 Nishi 7, Kita-ku, Sapporo 060-8586, Japan
Hidehiko Sano
- Department of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Kita 13 Nishi 7, Kita-ku, Sapporo 060-8586, Japan
Kirsten L. Van Landuyt
- Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-facial Surgery, Catholic University of Leuven, Belgium
Bart Van Meerbeek
- Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-facial Surgery, Catholic University of Leuven, Belgium

Received 2 March 2006; received in revised form 5 May 2006; accepted 5 May 2006.

Abstract

Objective

Phase-separation within HEMA-free all-in-one dental adhesives may result in the entrapment of droplets within the adhesive resin. Strongly air-blowing prior to polymerization, can remove most of these droplets. The objective of this study was to evaluate the effect these droplets may have on the resistance of the adhesive–tooth interface to NaOCl degradation.

Methods

The micro-tensile bond strength (μTBS) to enamel and dentin was determined when a HEMA-free all-in-one adhesive was applied either following a mild or strong air-blowing technique. The bonds were also exposed to an aqueous sodium hypochlorite (NaOCl) solution for 1h, following a recently introduced methodology to mimic in vivo bond degradation.

Results

This study revealed that strong air-blowing of the adhesive only resulted in a significantly higher micro-tensile bond strength (μTBS) to dentin, but not to enamel. Likewise, NaOCl only reduced the μTBS to dentin for both the mild and strong air-blowing technique, but again not the μTBS to enamel. Failure analysis by SEM clearly revealed that strong air-blowing is less effective in droplet removal when the adhesive was applied in small and narrow class-I cavities, as compared to when it was applied to flat surfaces.

Conclusions

NaOCl did preferentially dissolve the hybrid layer at dentin, and more for the mild than for the strong air-blowing technique. A strong air-blowing procedure resulted in a more NaOCl-resistant hybrid layer, so that it can be concluded that a HEMA-free one-step adhesive definitely benefits from a strong air-blowing technique.

Keywords: Adhesion, Dental adhesive, NaOCl, Enamel, Dentin