Rationale behind the design and comparative evaluation of an all-in-one self-etch model adhesive

Kanehira, Masafumi; Finger, Werner J.; Ishihata, Hiroshi; Hoffmann, Marcus; Manabe, Atsufumi; Shimauchi, Hidetoshi; Komatsu, Masashi

doi:10.1016/j.jdent.2009.01.013

« Previous Next »Journal of Dentistry
Volume 37, Issue 6 , Pages 432-439, June 2009

Rationale behind the design and comparative evaluation of an all-in-one self-etch model adhesive

Masafumi Kanehira
- Graduate School of Dentistry, Department of Restorative Dentistry, Division of Operative Dentistry, Tohoku University, Sendai, Japan
Werner J. Finger
- University of Cologne, Germany
- Graduate School of Dentistry, Department of Restorative Dentistry, Division of Operative Dentistry, Tohoku University, Sendai, Japan
- Corresponding author at: Graduate School of Dentistry, Department of Restorative Dentistry, Division of Operative Dentistry, Tohoku University, 4-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Miyagi, Japan.
Hiroshi Ishihata
- Graduate School of Dentistry, Department of Restorative Dentistry, Division of Periodontology and Endodontology, Tohoku University, Sendai, Japan
Marcus Hoffmann
- Heraeus Kulzer GmbH, Research & Development, Wehrheim, Germany
Atsufumi Manabe
- Department of Clinical Cariology and Endodontology, Showa University, Tokyo, Japan
Hidetoshi Shimauchi
- Graduate School of Dentistry, Department of Restorative Dentistry, Division of Periodontology and Endodontology, Tohoku University, Sendai, Japan
Masashi Komatsu
- Graduate School of Dentistry, Department of Restorative Dentistry, Division of Operative Dentistry, Tohoku University, Sendai, Japan

Received 20 November 2008; received in revised form 27 January 2009; accepted 28 January 2009.

Abstract

Objective

To investigate and compare bonding and dentin sealing efficacy of a marketed all-in-one and an experimental model adhesive with minimum effective amounts of acidic monomer and water.

Materials and methods

Composition of model adhesive (NAD) in mass%: UDMA (45), 4-META (20), H₂O (7.5), and acetone (27.5). For characterization of a reasonable NAD application procedure shear bond strengths (SBS, n=8) were determined on human enamel and dentin. Clearfil S³ Bond (TSB; Kuraray) served as reference. SBSs were evaluated after 10min, 1 and 7 days, and 1 month, marginal adaptation (n=8) was assessed in cylindrical butt-joint dentin cavities. Diffusive and convective water fluxes through 1mm thick adhesive-coated dentin disks (n=6) were qualitatively and quantitatively analyzed.

Results

SBSs proved that application of NAD in one coat with 20s agitated dwell time was ≥20MPa, enamel SBSs (24h) were 25MPa, p>0.05. Dentin SBSs for TSB and NAD were not different (p>0.05) at the four stages (means: 18.9, 23.5, 25.4, and 23.6MPa). Five and seven of the eight bonded restorations with TSB and NAD were gap-free (p>0.05). Dentin disks treated with EDTA from both sides or one side only were highly permeable for liquid, whereas adhesive-coated dentin disks showed no permeability at 0 and 2.5kPa water pressure.

Conclusions

Within the limitations of this study the model adhesive tested represents a promising basic composition for all-in-one adhesives, eliminating common problems encountered with single step adhesives such as phase separation and permeability.

Keywords: Self-etch adhesives, Enamel–dentin bonding, Bond strength, Marginal adaptation, Phase separation, Permeability