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

Rezvani, Mohammad Bagher; Atai, Mohammad; Safar Alizade, Hamid; Mohammadi Basir, Mahshid; Koohpeima, Fatemeh; Siabani, Saba

doi:10.30476/dentjods.2019.44923

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

Document Type : Original Article

Authors

Mohammad Bagher Rezvani ¹

Mohammad Atai ²

Hamid Safar Alizade ³

Mahshid Mohammadi Basir ¹

Fatemeh Koohpeima ⁴

Saba Siabani ⁵

¹ Dept. of Operative Dentistry, School of Dentistry, Shahed University, Tehran, Iran.

² Dept. of Polymer Science, Iran Polymer and Petrochemical Institute, Tehran, Iran.

³ General Dentist, Private Practice, Tehran, Iran.

⁴ Dept. of Operative Dentistry, Biomaterials Research Center, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.

⁵ General Dentist and Dental Specialties Candidate, Dept. of Operative Dentistry, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.

https://doi.org/10.30476/dentjods.2019.44923

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 0.5%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

Keywords

Glass Ionomer

Silica

Nanoparticles

Shear Strength

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