Effects of different percentages of microhydroxyapatite on microhardness of resin-modified glass-ionomer and zirconomer
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Effects of different percentages of microhydroxyapatite on microhardness of resin-modified glass-ionomer and zirconomer

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Effects of different percentages of microhydroxyapatite on microhardness of resin-modified glass-ionomer and zirconomer

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dc.contributor.author Sharafeddin, Farahnaz es
dc.contributor.author Shoale, Soodabe es
dc.contributor.author Kowkabi, Mahsa es
dc.date.accessioned 2017-09-28T07:58:42Z
dc.date.available 2017-09-28T07:58:42Z
dc.date.issued 2017 es
dc.identifier.uri http://hdl.handle.net/10550/61227
dc.description.abstract Hydroxyapatite (HA) is the main mineral component of the tooth structure, which exhibits considerable biological behavior and its incorporation might improve microhardness of dental materials. Microhardness of restorative materials, like glass-ionomer, is critical for the clinical longevity of restorations. The aim of this study was to evaluate the microhardness of two glass-ionomers types by incorporating different percentages of microhydroxyapatite. In this study, 80 disc-shaped experimental specimens (6 mm in diameter, 2 mm in height) were prepared in 8 groups, including resin-modified glass-ionomer (RMGI, GC, Gold Label, Japan), zirconia-reinforced glass-ionomer (Zirconomer, Shofu, Kyoto, Japan), and their mixture with 0, 5, 15 and 25 wt% of microhydroxyapatite (Sigma-Aldrich, Germany). All the specimens were stored in deionized water at 37ºC for 24 hours. Then Vickers microhardness test was carried out on the both sides of specimens and data were analyzed using two-way ANOVA and paired t-test (P<0.05). Microhardness of Zirconomer and RMGI increased significantly due to adding 5 and 15 wt% of micrhydrox-yapatite (P<0.001). The highest Vickers hardness number (VHN) was recorded in the RMGI group with 5 wt% of microhydroxyapatite. In addition, in all the study groups RMGI exhibited higher microhardness values than Zirconomer (P<0.001). However, microhardness values decreased significantly after adding 25 wt% of microhydroxyapatite to Zirconomer (P<0.001). Similarly, VHN decreased in RMGI groups containing 25 wt% of HA compared to control groups (without HA) (P<0.001). Incorporation of 5 and 15 wt% of microhydroxyapatite to RMGI and Zirconomer improved microhardness, while adding 25 wt% of HA decreased hardness with both experimental materials compared to the control groups (without HA). es
dc.source Sharafeddin, Farahnaz ; Shoale, Soodabe ; Kowkabi, Mahsa. Effects of different percentages of microhydroxyapatite on microhardness of resin-modified glass-ionomer and zirconomer. En: Journal of Clinical and Experimental Dentistry, 9 6 2017: 805-811 es
dc.title Effects of different percentages of microhydroxyapatite on microhardness of resin-modified glass-ionomer and zirconomer es
dc.type info:eu-repo/semantics/article en
dc.type info:eu-repo/semantics/publishedVersion en
dc.subject.unesco UNESCO::CIENCIAS MÉDICAS es
dc.identifier.doi 10.4317/jced.53668 es

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