A single-component bonding system microleakage study.

The microleakage of a one-component bonding system is compared to a two-component system and a control. Class V cavity preparations were prepared in extracted teeth under high speed and water coolant so that incisal/occlusal margins were in enamel, and gingival margins were in dentin. Group I was restored with composite and no bonding agent; Group II was restored with Prime and Bond and composite, and Group III was restored with ProBond and composite. All specimens were thermocycled in fuchsin dye to evaluate the degree of microleakage. Significant differences were observed between the no bonding agent group and the Prime and Bond and ProBond groups. The results indicate that the one-step dentin bonding system has the ability to prevent microleakage effectively at both composite-enamel and composite-dentin tooth surface interfaces.