Background: To evaluate the effect of two different deproteinizing agents (5.25% sodium hypochlorite and Papaca-rie®) prior to acid etching on the shear bond strength and microleakage of a fissure sealant material. Material and Methods: A total of 123 extracted noncarious human third molar teeth were randomly divided into three groups for each test: acid etching alone (control) (C), sodium hypochlorite (NaOCl), and Papacarie Duo ® (PC). The shear bond strength tests were performed using a universal testing machine, and microleakage was evaluated using a dye penetration method. Results: The mean shear bond strength values obtained in Group C were significantly lower than those of Group NaOCl and Group PC (p=0.0001). There were no significant differences between Group NaOCl and Group PC (p >0.05). No statistically significant difference was observed among the groups in terms of microleakage (p>0.05). Conclusions: Papacarie Duo® and 5.25% sodium hypochlorite treatments before etching increased the shear bond strength of the fissure sealant. However, pre-treatment with these agents did not decrease the microleakage between teeth and sealant.

Aim:The purpose of this study was to assess the surface roughness of six different restorative materials when covered with surface coating agent prior to 1.23% acidulated phosphate fluoride gel application. Materials and methods: Six restorative materials (Fuji IX, Amalgomer CR, Dyract XP, Beautifil II, ACTIVA, Filtek Z250) were used in this study. 28 specimens were prepared from each material and randomly divided into 4 groups (n=7) according to surface treatment regimens. Group C: control, no application, Group F: only acidulated phosphate fluoride gel application, Group S: only surface coating agent application, Group SF: acidulated phosphate fluoride gel application following the surface coating procedure. The surface roughness values for all specimens were measured using profilometer. The results were analyzed using analysis of variance (ANOVA), Newman Keuls and Tukey's tests (p<0.05). Results: There were no statistically significant differences in surface roughness between group C and F for all analyzed materials, except for Amalgomer CR (p>0.05). The control group of Amalgomer CR showed greater surface roughness values than that of the group F (p=0.001). Group S produced significantly smoother surfaces than the group C for all restorative materials, except Dyract XP (p=0.001). Conclusion:1.23% acidulated phosphate fluoride gel application did not promote a significant increase on the surface roughness of restorative materials whether or not surface coated. However, surface coating was found to produce smoother surfaces.