Abstract
The penetration of Bonfil, Sevriton, Addent, Dakor and two experimental adhesives into enamel surfaces was investigated with particular reference to the possibility that mechanical factors due to resin penetration might be involved in the bonding of these materials to acid conditioned enamel surfaces. Radiosulphur 35 as SO 4 and basic fuchsin dye did not penetrate the interface between the Sevriton self-curing resin or the adhesive and the enamel surface to which they were attached even after 6 months to 1 year in physiological saline solution. Enhanced bonding to acid conditioned surfaces compared to unconditioned ones appeared to be associated with the presence of “prism-like” tags presumably formed by penetration of the resin into enamel spaces created by the acid conditioning. When surfaces were not conditioned prior to application of the test materials poor bonding resulted with absences of tags. Differences in bonding strength and/or its longevity among the various materials may be related to differences in their physical and chemical properties.
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