%0 Journal Article %T The Effect of Incorporation of 0.5 %wt. Silica Nanoparticles on the Micro Shear Bond Strength of a Resin Modified Glass Ionomer Cement %J Journal of Dentistry %I Shiraz University of Medical Sciences %Z 2345-6485 %A Rezvani, Mohammad Bagher %A Atai, Mohammad %A Safar Alizade, Hamid %A Mohammadi Basir, Mahshid %A Koohpeima, Fatemeh %A Siabani, Saba %D 2019 %\ 06/01/2019 %V 20 %N 2 %P 124-130 %! The Effect of Incorporation of 0.5 %wt. Silica Nanoparticles on the Micro Shear Bond Strength of a Resin Modified Glass Ionomer Cement %K glass ionomer %K Silica %K Nanoparticles %K Shear strength %R 10.30476/dentjods.2019.44923 %X Statement of the Problem: The clinical success of glass ionomer restorations depends on the strength of resin-modified glass ionomer (RMGI) cement bonding to dentin and there is limited information available regarding the bond strength of resin modified glass ionomers containing silica nanoparticles to dental structures.Purpose: The aim of this study was to compare the microshear bond strength (µSBS) of RMGI with and without silica (SiO2) nanoparticles to dentin of permanent teeth.Materials and Method: in this experimental study, the occlusal surfaces of 30 freshly extracted intact third molars were ground to expose the flat dentin and after conditioning with 20% poly acrylic acid, were randomly assigned to two main groups (n=15). The first group was filled with RMGI (Fuji II LC, GC) and the second group was filled with RMGI plus 0.5%wt. silica nanoparticles. Then, each main group was divided into three subgroups, and then stored in an incubator at 37 oC with 100% humidity for 1, 7, and 30 days. The µSBS test was performed using a universal testing machine (1 mm/min). The data were analyzed by t-test, repeated measures ANOVA and Tukey test (p < 0.05).Results: There were no statistically significant differences between the mean µSBS of the groups with and without nanoparticles along the different storage periods (p> 0.05). There was significant difference in µSBS values among the three different storage periods in all the tested materials (p < 0.05).Conclusion: Incorporation of 0.5 %wt. silica nanoparticles did not compromise the µSBS of Fuji II LC RMGI to dentin.Key Words   Glass Ionomer; Silica; Nanoparticles ; Shear Strength %U https://dentjods.sums.ac.ir/article_44923_f3be547fa836ee6d22b0bfae727a4eae.pdf