Effect of Phenyl-P/HEMA acetone primer on wet bonding to EDTA-conditioned dentin.

Abstract

OBJECTIVES:

The purpose of this study was to examine the effect of 2-methacryloyloxyethyl phenyl phosphoric acid (Phenyl-P)/2-hydroxyethyl methacrylate (HEMA) acetone-based primer on moist dentin surfaces that were preconditioned with ethylenediaminetetraacetate (EDTA) to remove the smear layer.

METHODS:

Bovine dentin were prepared with 180-grit paper, conditioned with 0.5M EDTA (pH 7.4) for 60s followed by water rinsing and then blot drying. Each surface was then primed with Phenyl-P/30 wt% HEMA in acetone for 10s followed by blot drying. A light-cured bonding agent was then applied, cured and trimmed to give dumbbell-shaped specimens. The Phenyl-P concentration ranged from 1 to 20 wt%. During the bonding procedure, no compressed air was used. After storage in water at 37 degrees C for one day, tensile bond strengths were measured and analyzed using one-way ANOVA. Dentin discs treated under the same conditions were observed under a scanning electron microscope (SEM).

RESULTS:

When the concentration of Phenyl-P was 12 wt%, the highest mean tensile bond strength was obtained (27 MPa). It was significantly higher than that of the 3, 5, 15 or 20 wt% groups (9-11 MPa) (p<0.05). The samples of 1 wt% group were all broken during trimming the dumbbell-shaped specimens. SEM observations showed a 1 microm-thick layer of hybridized dentin after polished cross-sections were chemically challenged with 6N HCl for 30s and then 1% NaOCl for 60 min.

SIGNIFICANCE:

The experimental Phenyl-P/HEMA acetone primer is effective in bonding resin to EDTA-conditioned dentin. Acetone as a solvent for Phenyl-P/HEMA primer has the clinical advantage of not requiring an air-stream to evaporate the solvent. The experimental bonding procedure can minimize the skin irritation by HEMA.

• Authors: K Miyasaka, N Nakabayashi
• Journal: Dental materials : official publication of the Academy of Dental Materials (Dent Mater) Vol. 17 Issue 6 Pg. 499-503 (Nov 2001) ISSN: 0109-5641 [Print] England
• PMID: 11567687 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• 2-methacryloyloxyethyl phenyl phosphoric acid
• Dentin-Bonding Agents
• Methacrylates
• Organophosphorus Compounds
• Acetone
• hydroxyethyl methacrylate
• Edetic Acid

Topics

• Acetone (chemistry)
• Acid Etching, Dental
• Analysis of Variance
• Animals
• Cattle
• Dental Bonding
• Dentin (drug effects)
• Dentin Permeability
• Dentin-Bonding Agents (chemistry)
• Edetic Acid (chemistry, pharmacology)
• Materials Testing
• Methacrylates (chemistry)
• Microscopy, Electron, Scanning
• Organophosphorus Compounds (chemistry)
• Smear Layer
• Surface Properties
• Tensile Strength