SALIVA CONTAMINATION AND BOND STRENGTH OF SINGLE-BOTTLE ADHESIVES TO ENAMEL AND DENTIN

Purpose: To determine and compare the shear bond strength of four sing le-bottle adhesives to enamel and dentin contaminated with human saliv a. Materials and Methods: Prime & Bond 2.1, One Step, Tenure Quik and Syntac Single Component were evaluated. Ninety-six sound molars were d ivided into three subgroups for each of the four adhesives. Small flat areas on the buccal and lingual surfaces were ground in enamel. Small flat areas on the mesial and distal surfaces were ground on the middl e dentin of the same teeth. Each adhesive was tested under: uncontamin ated conditions (Group I), contamination of the bonding surface with f resh whole saliva for 20 seconds and removing the excess with cotton p ellets (Group 2), and contamination of the bonding surface with fresh whole saliva for 20 seconds and rinsing the saliva for 20 seconds befo re adhesive application (Group 3). After adhesive application, a plast ic mold was filled with composite, applied to the bonding surface and light-cured. The teeth were thermocycled (1,000 cycles) and sheared us ing an Instron testing machine. The results were analyzed using a thre e-way ANOVA. Results: Saliva contamination of enamel or dentin did not affect the shear bond strength of the adhesives tested except for Syn tac SC with contaminated dried enamel. One Step displayed similar bond strengths to both enamel and dentin; P & B 2.1, Tenure Q and Syntac S C displayed higher bond strength to enamel than to dentin. P & B 2.1 s howed significantly higher bond strengths to enamel than the other adh esives, but there was no significant difference for dentin bond streng th under the uncontaminated condition.