Interactions of self-etch adhesives with resin composites

Kurokawa, Rie; Finger, Werner J.; Hoffmann, Marcus; Endo, Tatsuo; Kanehira, Masafumi; Komatsu, Masashi; Manabe, Atsufumi

doi:10.1016/j.jdent.2007.09.003

« Previous Next »Journal of Dentistry
Volume 35, Issue 12 , Pages 923-929, December 2007

Interactions of self-etch adhesives with resin composites

Rie Kurokawa
- Graduate School of Medical and Dental Sciences, Department of Oral Biological Science, Division of Orthodontics, Niigata University, Japan
Werner J. Finger
- School of Dental Medicine, Department of Preclinical Dentistry, University of Cologne, Kerpener Strasse 32, D-50931 Cologne, Germany
- Corresponding author at: Department of Preclinical Dentistry, School of Dental Medicine, University of Cologne, Kerpener Strasse 32, D-50931 Cologne, Germany. Tel.: +49 2133 514996; fax: +49 2133 513410.
Marcus Hoffmann
- Heraeus Kulzer GmbH, Research & Development, Wehrheim, Germany
Tatsuo Endo
- Graduate School of Dentistry, Department of Restorative Dentistry, Division of Operative Dentistry, Tohoku University, Sendai, Japan
Masafumi Kanehira
- Graduate School of Dentistry, Department of Restorative Dentistry, Division of Operative Dentistry, Tohoku University, Sendai, Japan
Masashi Komatsu
- Graduate School of Dentistry, Department of Restorative Dentistry, Division of Operative Dentistry, Tohoku University, Sendai, Japan
Atsufumi Manabe
- Department of Clinical Cariology and Endodontology, Division of Esthetic Dentistry, Showa University, Tokyo, Japan

Received 5 July 2007; received in revised form 29 August 2007; accepted 3 September 2007.

Abstract

Objective

Aim of this in vitro study was to investigate the correlation of shear bond strength and marginal cavity adaptation, together with polymerization shrinkage and contraction stress, using the combination of four self-etch adhesives and three resin composites.

Materials and methods

Interactions were studied between one two-step and three one-step adhesives, and the hybrid-type resin composites, Beautifil (BEU, Shofu) and Venus (VEN, Heraeus), and an experimental nano-hybrid resin composite NEUN (NEU, Heraeus). For all 12 combinations shear bond strengths (SBS) were determined on human dentin. Marginal adaptation (MGW) was assessed in cylindrical butt-joint dentin cavities. Further, polymerization contraction and contraction stress of the resin restoratives were measured.

Results

Significant determinants of SBSs on dentin were time of testing (10min or 24h) and adhesives (p<0.001). Marginal adaptation was best for NEU, followed by VEN and BEU. Only the resin composite used was a highly significant determinant of cavity adaptation. Polymerization shrinkage after 5min was 2.58, 2.74, and 1.53% for BEU, VEN, and NEU, respectively. Polymerization contraction stresses were largest for BEU, less for VEN, and smallest for NEU (p<0.05).

Conclusions

No correlation was found between bond strength and marginal cavity adaptation. In contrast, reduced shrinkage and low polymerization contraction stress of resin composites were identified as important determinants of marginal cavity adaptation.

Keywords: Self-etch adhesives, Resin composites, Dentin bonding, Polymerization contraction, Contraction stress, Bond strength, Marginal adaptation