All-in-one self-etch model adhesives: HEMA-free and without phase separation

Furukawa, Masae; Shigetani, Yoshimi; Finger, Werner J.; Hoffmann, Marcus; Kanehira, Masafumi; Endo, Tatsuo; Komatsu, Masashi

doi:10.1016/j.jdent.2008.02.011

« Previous Next »Journal of Dentistry
Volume 36, Issue 6 , Pages 402-408, June 2008

All-in-one self-etch model adhesives: HEMA-free and without phase separation

Masae Furukawa
- Department of Clinical Cariology and Endodontology, Showa University, Tokyo, Japan
Yoshimi Shigetani
- Division of Cariology, Operative Dentistry and Endodontics, Department of Oral Health Science, Niigata University, Graduate School of Medical and Dental Sciences, Niigata, Japan
Werner J. Finger
- School of Dental Medicine, Department of Preclinical Dentistry, University of Cologne, Germany
- Tohoku University, Sendai, Japan
- 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
Masafumi Kanehira
- Graduate School of Dentistry, Department of Restorative Dentistry, Division of Operative Dentistry, Tohoku University, Sendai, Japan
Tatsuo Endo
- 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

Received 13 December 2007; received in revised form 18 February 2008; accepted 19 February 2008.

Abstract

Objective

Aim of this study was to design HEMA-free all-in-one self-etch model adhesives without phase separation, and to investigate their efficiency on extracted human teeth.

Materials and methods

Compositions of adhesives in mass% (1): UDMA (25), 4-META (20), H₂O (0, 1, 2, 5, 10, 20, 35, and 45), balance of acetone or ethanol. (2): UDMA (35), 4-META or 4-MET (28), H₂O (0, 2, 4, 5, 6, and 8), balance of acetone. Phase separation was evaluated on samples exposed to ambient atmosphere. Conventional shear bond strengths (SBS, n=8) were determined on human enamel and dentin. Marginal adaptation (MGW, n=8) was assessed in cylindrical butt-joint dentin cavities.

Results

Solutions (1) and (2) with 5 and 8% or less water content, respectively, showed no phase separation. SBSs on enamel were not different within the acetone- or ethanol-group and between the adhesive groups (1). Water content of adhesives (2) was a significant determinant of enamel SBSs, groups with 4-META or 4-MET were not different (p>0.05). Dentin SBSs with adhesives (1) were not different (p>0.05) within solvent groups, yet higher for acetone-dissolved adhesives (p<0.05). Dentin SBSs with adhesives (2) were different by water content and functional monomer (p<0.05). MGW for solutions (1) were smaller with acetone-dissolved than with ethanol-dissolved adhesives (p<0.001). Acetone solutions between 2 and 45% water content produced almost perfect marginal adaptation. Marginal adaptation of adhesives (2) was almost perfect at 5 through 8% water content.