Abstract
Tensile bond strengths of Scotchbond, Clearfil, Cervident and Coremax dentin primers were measured for bonds formed with or without an applied pressure. All materials showed low bond strength with the non-pressure method and only Scotchbond and Cervident benefited from the application of pressure during bond formation, giving values of approximately 2 MPa, similar to that obtained with glass ionomer cement. In general, pretreatment of the dentin with demineralizing agents gave reduced or unchanged bond strengths, as did various aqueous metal salt solutions advocated in the literature. The bond strengths obtained with the primers were insensitive to the quantity applied. All primers bonded better to enamel and synthetic hydroxyapatite than to dentin.
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