Objective: The aim of this study was to evaluate the effect of saliva contamination on bond strengths of two self etching adhesive systems (Clearfil SE Bond (SE); Kuraray and Optibond Solo Plus (OBSP); Kerr). Methods: Flat occulusal dentin surfaces were created on 180 extracted human molar teeth 2 mm above the dentino-enamel junction. The teeth were randomly divided into 12 groups (n=15). Adhesives were bonded to the specimens according to the manufacturers' instructions using 6 different application procedures: Group1: Control (Non-contamination); Group2: saliva/ driying/ primer /bonding/ composite; Group3: primer/saliva/ rinsing/ driying/ primer /bonding/composite; Group4:primer/saliva/rinsing/driying/bonding/composite; Group5:primer/bonding/saliva/rinsing/drying/primer/bonding/composite; Group6:primer/bonding /saliva /remowing a few dentin with a diamond bur/primer/bonding/ composite. Composites (Clearfil AP-X, Kerr Point 4) were applied to the surfaces in standart cylindirical shaped plastic matrixes and light cured. Shear bond strength test was carried out after storage in distilled water at 37°C for 24 h. Shear bond testing was applied by using a special stubby-shaped apparatus (Ultradent, USA) at a crosshead speed of 1.5 mm/min. Data were recorded in MPa. One-Way ANOVA was used for the statistically analysis. Results: The bond strength values of SE groups were higher than OBSB groups in all groups. The two adhesive systems showed different sensitivity for contamination of saliva during the different bonding application procedures. Group 4 of SE bond system showed the lowest bond strength values and group 5 of SE bond system showed the highest bond strength values . For OBSP bond system, the lowest bond strength value was showed group 6, and the highest bond sterength value was showed group 3.Conclusion: Bonding procedure reapplication after saliva contamination of cured adhesive layer (group 5) had no adverse effect on dentin shear bond strengths of both bonding agents.

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