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Effect of Hydrostatic Pressure on the Diffusion of Monomers through Dentin in vitro

T.M. Gerzina

Department of Restorative Dentistry, University of California, San Francisco, 707 Parnassus Ave., San Francisco, California 94143-0758

W.R. Hume

Department of Restorative Dentistry, University of California, San Francisco, 707 Parnassus Ave., San Francisco, California 94143-0758

In previous work, the diffusion of monomers from composite and bonding resins through dentin was demonstrated in vitro. The monomers triethylene glycol dimethacrylate (TEGDMA) and 2-hydroxyethyl methacrylate (HEMA) were identified in samples from the pulp space. In the current study, we examined the effects of two levels of positive hydrostatic pressure on the passage of resin monomers through dentin in vitro from a compositeresin/bonding-resin combination to test the hypothesis that monomer diffusion is prevented by such pressure. An occlusal cavity prepared in the tooth crown was restored with the resins. Distilled water samples from the pulpal space were removed over time and analyzed for monomer content by high-performance liquid chromatography and mass spectrometry. Positive pulpal pressure reduced but did not prevent pulpward movement of diluent monomers that leach from bonding agents and from resin composites through dentin in vitro. The degree of reduction of diffusion was greater with TEGDMA than with the lower-molecular-weight monomer HEMA.

Key Words: resin monomers • hydrostatic pressure • diffusion • dentin.

Journal of Dental Research, Vol. 74, No. 1, 369-373 (1995)
DOI: 10.1177/00220345950740011301
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