The Effect of Incorporation of 0.5 wt. Silica Nanoparticles on the Micro Shear Bond Strength of a Resin Modified Glass Ionomer Cement

Mahshid Basir | Fatemeh Koohpeima | Saba siabani | Hamid safaralizadeh | Mohamad Rezvani | mohammad atai

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URL :   http://research.shahed.ac.ir/WSR/WebPages/Report/PaperView.aspx?PaperID=158693
Date :  2019/06/05
Publish in :    مجله دندانپزشکي دانشگاه علوم پزشکي شيراز=Journal of Dentistry, Shiraz University of Medical Sciences


Keywords :Glass Ionomer Silica Nanoparticles Shear Strength

Abstract :

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ABSTRACT 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 0.5wt. 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.