Effects of HEMA/Solvent Combinations on Bond Strength to Dentin

Re-expansion of dried demineralized dentin is required to optimize resin adhesion. This study tested the hypothesis that bond strengths to dentin depend upon the ability of experimental HEMA(2-hydroxy-ethyl-methacrylate)/solvent primers to re-expand the matrix. Dentin surfaces were acid-etched with...

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Bibliographic Details
Published inJournal of dental research Vol. 82; no. 8; pp. 597 - 601
Main Authors Carvalho, R.M., Mendonça, J.S., Santiago, S.L., Silveira, R.R., Garcia, F.C.P., Tay, F.R., Pashley, D.H.
Format Journal Article
LanguageEnglish
Published United States SAGE Publications 01.08.2003
SAGE PUBLICATIONS, INC
Subjects
1-Propanol - chemistry
Acid Etching, Dental
Acrylic Resins - chemistry
Boron Compounds - chemistry
Dental Bonding
Dentin - ultrastructure
Dentin-Bonding Agents - chemistry
Dentistry
Ethanol - chemistry
Humans
Materials Testing
Methacrylates - chemistry
Methanol - chemistry
Phosphoric Acids - chemistry
Regression Analysis
Solvents - chemistry
Surface Properties
Temperature
Tensile Strength
Time Factors
Water - chemistry
microtensile bond strength
solvents
dentin
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Summary:Re-expansion of dried demineralized dentin is required to optimize resin adhesion. This study tested the hypothesis that bond strengths to dentin depend upon the ability of experimental HEMA(2-hydroxy-ethyl-methacrylate)/solvent primers to re-expand the matrix. Dentin surfaces were acid-etched with 37% phosphoric acid for 20 sec, air-dried for 30 sec, primed with either 35/65% (v/v) HEMA/water, HEMA/methanol, HEMA/ethanol, or HEMA/propanol for 60 sec, and bonded with 4-META-TBBO(4-methacryloyloxyethyl trimellitate anhydride-tri-n-butyl borane) adhesive. After storage in water for 1 day at 37°C, the samples were prepared for microtensile bond strength testing. We used transmission electron microscopy to measure the width of interfibrillar spaces in the hybrid layers. The HEMA/ethanol primer and the HEMA/propanol primer produced the highest and the lowest bond strengths, respectively (p < 0.05). Bond strengths were directly correlated with the width of the interfibrillar spaces (p < 0.05). Bond strengths are related to the ability of the primer to maintain the re-expansion of collapsed demineralized dentin matrix.
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ISSN:0022-0345
1544-0591
DOI:10.1177/154405910308200805