Mohammad Bagher Rezvani1, Mohammad Atai2, Hamid Safar Alizade3, Mahshid Mohammadi Basir1, Fatemeh Koohpeima4, Saba Siabani5. 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.
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.
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.
Authors: E Coutinho; M V Cardoso; J De Munck; A A Neves; K L Van Landuyt; A Poitevin; M Peumans; P Lambrechts; B Van Meerbeek Journal: Dent Mater Date: 2009-11 Impact factor: 5.304
Authors: Zahra Malekhoseini; Mohammad Bagher Rezvani; Mohammad Niakan; Mohammad Atai; Mahshid Mohammadi Bassir; Hamid Safar Alizade; Saba Siabani Journal: Dent Res J (Isfahan) Date: 2021-09-25