RESUMEN
Saliva contamination of dentin surface during restoring teeth is one of common problems in restorative dentistry that may affect the shear bond strength of adhesive. The aim of this in vitro study was to investigate the effect of saliva contamination on shear bond strengths of two kinds of common one-bottle adhesives in Iran - [Excite] and [Single Bond] during different bonding procedures. Ninety extracted sound human premolar teeth [closed apex] with prepared flat dentinal surfaces were randomly divided into three groups of thirty as control group [without saliva contamination], Group with saliva contamination after etching and Group with saliva contamination after cured resin; and each group was randomly divided into two groups of fifteen for each adhesive. Composite via plastic mold was mounted on specimens and specimens were thermocycled. Finally shear bond strengths were measured. One way ANOVA test was used to compare shear bond strengths of different groups and Tukey test was used for 2 by 2 comparisons of bond strengths between groups. No statistically significant difference was found between different groups [P=0.673], and between two kinds of [Excite] and [Single Bond] adhesives, [p>/0.05]. Saliva contamination of dentin after etching and after cured resin had no adverse effect on shear bond strengths of [Excite] and [Single Bond] adhesives, and no significant difference was found between shear bond strengths of [Excite] and [Single Bond] adhesives too