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J Dent Res 44(5): 895-902, 1965
© 1965 International and American Associations for Dental Research
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Adhesive Bonding of Various Materials to Hard Tooth Tissues. II. Bonding to Dentin Promoted by a Surface-active Comonomer

R. L. BOWEN 1

1 American Dental Association, National Bureau of Standards, Washington, D.C.

The strength of bonds between a directfilling acrylic resin and dentin surfaces, tested in tension after soaking for 20 hours in water, was only 0-1.4 kg/cm2 (0-20 psi) when the dentin was treated with one of the following: nothing; cavity primer; cavity seal; ethanol; or 5 per cent ethanol solutions of oleic acid, China wood fatty acid, and N-phenylglycine. A quick-setting and a general-purpose epoxy resin gave similar results.

A surface-active comonomer, the addition-reaction product of N-phenylglycine and glycidyl methacrylate (NPG-GMA), was synthesized for use as a coupling agent between the resin and the substrate. When a 5 per cent ethanol solution of NPG-GMA was applied before the methacrylate resin, the average tensile strength of the bond was between 10.5 and 22.5 kg/cm2 (150 and 320 psi)—a significant improvement.

Reapplication of this NPG-GMA solution and resin without resurfacing between tests gave successively increasing values to 46 kg/cm2 (660 psi), which dropped significantly when the same specimens of dentin were resurfaced, following this series of tests, before reapplication of the NPG-GMA solution. Whether this further increase was due to incremental removal of a fractured surface layer, to an increase in the population density of NPG-GMA molecules on the substrate surface, or to other reasons should be determined.

Submitted on January 29, 1964




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