BOND STRENGHT OF AN ADHESIVE SYSTEM TO DENTIN CONTAMINATED WITH A CARIES DETECTOR DYE, BLOOD AND SALIVA

Aim: the aim of this study was to evaluate the microtensile bond strenght (μtbs) of a self-etch adhesive system to dentin surface contaminated with blood, saliva and caries detector dye. material and method: sixteen extracted human carious-free permanent molar teeth were used to obtain flat occlusal dentin surfaces. the dentin surfaces were grinded with 600 grid sandpaper underwater irrigation. teeth were divided into four groups (i: control, ii: blood, iii: saliva and iv: caries detector) blood, saliva and caries detector dye were applicated on the dentin surfaces, then were rinsed and dried. teeth were restored with self-etch adhesive system (clearfil se bond) 2mm thick composite resin. then specimens were stored 37°c distilled water during 24 hours. five microtensile specimens from each tooth measuring 1.00±0.003 mm were prepared with a slow speed diamond saw sectioning machine with a diamond-rim blade. (n=20). these specimens were attached to opposing arms of the microtensile testing device with cyanoacrylate adhesive and fractured under tension at a crosshead speed of 1 mm/min. statistical analysis was made with one-way analysis of variance (anova).(α=0.05) results: μtbs values of groups were (mean ± sd in mpa); i: 21.21± 2.15, ii: 5.58±1.14, iii: 8.33±1.12, iv: 17.94±1.37. there was significant differences between μtbs of groups. (p<0.05) conclusions: contamination of dentin with saliva and blood were negatively affected μtbs of self-etch adhesive systems. the higher μtbs values was observed at control group and the blood contamination group showed lower bond strenght than other groups.