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A Method for Demonstrating Resin Penetration into Dentin

The penetration of resin monomer into and its polymerization in porosities in enamel created by acid conditioning is believed the principal means by which scalants and restorative resins are bonded to enamel. First demonstrated in the laboratory (GWINNETT and BuONOCORE, Brit Dent J 119:77, 1965) and later confirrned in vivo (GWINNETT and RIPA, Arch Oral Biol 18:435, 1973) this phenomenon has been termed "tag" formation. Often oversimplified as cones of resin, in fact, the resin forms a pervasive, synthetic matrix permeating the microscopic and ultramicroscopic pores of the enamel rods and their crystallites (GWINNETT and MvTSui, Arch Oral Biol 12:1615, 1967). The "tags" were demonstrated by demineralization of enamel with a 10%O solution of hydrochloric acid which left behind the relatively insoluble resin. Resin penetration has also been shown to occur into dentinal tubules (GWINNETT, J Dent Res, 56:1155, 1977) made patent by acid conditioning. The method used in the demonstration