Effect of rinsing water temperature and water storage duration on composite-dentin shear bond strength in etch-and-rinse and self-etching adhesive systems

Temperature seems to be an effective factor in dentin-composite bond strength. The purpose of this study was to evaluate the effect of rinsing water temperature and water storage duration on the shear bond strength of dentin‒composite resins with etch-and-rinse and self-etching bonding systems. In this experimental study etch-and-rinse systems All-Bond3، OptiBond Fl، Prime & Bond NT and Adper Single Bond and self-etching systems All Bond SE، Clearfil SE Bond، OptiBond All-In-One and FuturaBond were used. The enamel of buccal and lingual surfaces of 192 mounted healthy third molars was removed. The specimens were divided randomly into 16 groups; before using the primer and bonding the composite resin cylinders and dentin surfaces were rinsed with distilled water at various temperatures such as 2 ± 5، 2 ± 22 و 2 ±23±2 and or 50 ±2°C. Composite cylinders were bonded and the specimens were stored in distilled water at 37°C. Shear bond strength was tested after 24 hours and 6 months. Data were analyzed with SPSS 19 using independent-samples t-test. The mean bond strength decreased in all the groups except for All Bond SE and OptiBond All-In-One groups; the decrease was significant for FL (p value < 0. 001) and P&B (p value = 0. 015). By increasing water temperature in all groups except (CSE and ASE) shear bond strength was increased that was significant for Prime & Bond NT (p value = 0. 015) and OptiBond FL (p value = 0. 001). Based on the results، the shear bond strength decreased with all the adhesives with an increase in rinsing water temperature except for two-step self-etch systems and decreased with time in all the groups except for one-step self-etching systems.