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Sharafeddin, Farahnaz, Azar, Mohammad Reza, Feizi, Negar, Salehi, Raha. (1396). Evaluation of Surface Microhardness of Silver and Zirconia Reinforced Glass-ionomers with and without Microhydroxyapatite. سامانه مدیریت نشریات علمی, 4(4), 454-460.
Farahnaz Sharafeddin; Mohammad Reza Azar; Negar Feizi; Raha Salehi. "Evaluation of Surface Microhardness of Silver and Zirconia Reinforced Glass-ionomers with and without Microhydroxyapatite". سامانه مدیریت نشریات علمی, 4, 4, 1396, 454-460.
Sharafeddin, Farahnaz, Azar, Mohammad Reza, Feizi, Negar, Salehi, Raha. (1396). 'Evaluation of Surface Microhardness of Silver and Zirconia Reinforced Glass-ionomers with and without Microhydroxyapatite', سامانه مدیریت نشریات علمی, 4(4), pp. 454-460.
Sharafeddin, Farahnaz, Azar, Mohammad Reza, Feizi, Negar, Salehi, Raha. Evaluation of Surface Microhardness of Silver and Zirconia Reinforced Glass-ionomers with and without Microhydroxyapatite. سامانه مدیریت نشریات علمی, 1396; 4(4): 454-460.

Evaluation of Surface Microhardness of Silver and Zirconia Reinforced Glass-ionomers with and without Microhydroxyapatite

Journal of Dental Biomaterials
مقاله 1، دوره 4، شماره 4، اسفند 2017، صفحه 454-460    اصل مقاله (423.63 K)
نوع مقاله: Original Article(s)
نویسندگان
Farahnaz Sharafeddin* 1؛ Mohammad Reza Azar2؛ Negar Feizi3؛ Raha Salehi4
1Professor, Department of Operative Dentistry, Biomaterials Research Center, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran
2Associate Professor, Department of Endodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran
3Postgraduate Student, Department of Operative Dentistry, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran
4Assistant Professor, Department of Operative Dentistry, School of Dentistry, Kashan University of Medical Sciences, Kashan, Iran
چکیده
Statement of problem: Hardness of restorative materials like glass-ionomer is an important factor in the longevity of restoration.Objectives: The aim of this study was to evaluate the microhardness of glass-ionomer modified with different materials.Materials and Methods: Sixty disk-shaped specimens were examined in six groups in this study, including conventional glass-ionomer (Shofu, Japan), zirconia-reinforced glass-ionomer (Zirconomer, Shofu, Kyoto, Japan), silver-reinforced glass-ionomer (HI-DENSE XP, Shofu, Kyoto, Japan) and mixture of these three types of glass-ionomer with 20 wt% of microhydroxyapatite (Sigma-Aldrich, St. Louis, USA). All the specimens were stored in deionized water for 24 hours. Then Vickers microhardness test was carried out and the results were analyzed by using two-way ANOVA test and paired t-test (P<0.05).Results: Zirconia-reinforced glass-ionomer with microhydroxyapatite exhibited significantly higher microhardness in comparison with other groups (P<0.001). Conventional glass-ionomer with microhydroxyapatite showed the lowest microhardness (P<0.001). After incorporation of microhydroxyapatite in both conventional and silver-reinforced glass-ionomer groups, microhardness decreased significantly (P<0.001).The microhardness of top and bottom of all groups was significantly different. (P<0.001).Conclusions: Incorporation of 20% microhydroxyapatite to zirconia-reinforced glass-ionomer can improve microhardness.
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