THE EFFECT OF DIFFERENT LINER AND BASE MATERIALS ON THE SHEAR BOND STRENGTH OF COMPOSITE RESIN

Aim: the purpose of this study was to investigate the effect of different liner and base materials on bond strength of composite resin to dentin. material and methods: 60 non-carious extracted human third molar were used in this study. after the teeth were sectioned parallel to the occlusal surface to expose superficial dentin, specimens were randomly divided into six groups (n=10) to apply different liner or base materials. the groups were set that group 1: control, group 2: chemical calcium hydroxide, group 3: light cured calcium hydroxide, group 4: conventi- onal glass ionomer cement, group 5: encapsulated glass ionomer cement, group 6: resin modified calcium silicate. liner or base materials were placed on dentin surface according to manufacturer’s instructions. then adhesive system (clearfil se bond, kuraray medical inc., osaka, japan) and composite resin (tetric-n-ceram, ivoclar vivadent ag, schaan, liechtenstein) were applied on materials and dentin. the prepared specimen were placed in a universal testing machine for shear bond strength test. then, shear bond strength test was performed at a crosshead speed of 1.0 mm/min. data were analyzed by using one-way variance analysis (anova) and tukey hsd tests. the level of statistical significance was accepted p=0.05.results: while the control group showed higher bond strength, encapsulated glass ionomer cement group showed lower bond strength than the other groups. when comparing the mean shear bond strength, there are statistically significant differences between group 1 and group 4., 5., 6. also between group 2 and group 5 (p<0.05). moreover, there are no statistically significant differences between 3. groups and the other groups (p<0.05). conclusion: according to the results of this study, liner and base materials may affect the bond strength of composite resin to dentin.