الفهرس 
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Abstract
Objectives : The aim of this study is to evaluate microshear bond strength (μSBS) of calcium silicate-based cement (Biodentine) and glass ionomer cement (Fuji IX GP) to dentin. Micromorphological pattern of the cement / dentin interface was assessed using scanning electron microscope (SEM). Materials and methods : A total of 60 extracted caries free human third molars were divided into two groups according to restorative material type; calcium silicate-based cement or glass ionomer cement (n=30). Each group was subdivided into two subgroups of 15 molar each according to storage time interval (immediate and delayed). Occlusal enamel was removed by using water-cooled trimmer with abrasive disc and all dentin prepared surface were polished with 600-grit paper for 60 sec to create a standard flat surface. Two tygon tubes (0.9mm in diameter) stabilized over flat dentin surface and filled with calcium silicate-based cement (Biodentine, Septodont) or glass ionomer cement (Fuji IX GP, GC) according to manufacturers’ instructions; all specimens were incubated at 37°c. The specimens underwent μSBS testing in a universal testing machine, and fracture modes were analysed. For micromorphological assessment of cement/dentin interface, three molars per each group were prepared for SEM examination. Results: Two-way ANOVA revealed that the μSBS results were significantly affected by the “type of material” (p≤0.05) and “storage time” (p≤0.05). Tukey post hoc multiple comparison test showed that there was significant difference in μSBS mean value between both materials tested. However, glass ionomer cement immediated group showed the significantly higher than delayed group in μSBS value (p<0.05). Calcium silicate-based cement showed no significant difference between immediate and delayed group in μSBS value (p<0.05). SEM micrographs of cement/dentin interfaces show that there was mineral infiltration within dentin in calcium silicate-based cement groups. Conclusion : Microshear bond strength of glass ionomer cement (Fuji IX GP) is greater than calcium silicate-based restorative material (Biodentine) in permanent teeth and affected passively by storage.