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Journal of Dentistry, Shiraz University of Medical Sciences، جلد ۱۴، شماره ۳، صفحات ۱۱۱-۰
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عنوان انگلیسی Effect of a Combined Bleaching Regimen on the Microhardness of a Sealed Methacrylate-based and a Silorane-based Composite
چکیده انگلیسی مقاله Statement of Problem: The use of tooth bleaching agents has been very popular treatment in dentistry. The bleaching agents have an inherent potential to impair surface properties of existing composite resin restorations. Purpose: This study evaluated the effect of a combined bleaching regimen on the surface microhardness of a Silorane-based and a sealed methacrylate-based composite. Materials and Method: Forty-five specimens of methacrylate-based composite (Ice) and 18 specimens of Silorane composite (Filtek Silorane, 3M ESPE; USA) were prepared and randomly divided into 5 (1-5) and 2 (6-7) groups (n=9), respectively. After 8-week aging, groups 1 and 6 were remained with no treatment. In groups 2, 4 and 5, the specimens were covered by a surface sealant and light cured. In groups 3, 4, 5 and 7, the specimens were bleached with hydrogen peroxide 40% and then carbamide peroxide 20% for seven days. In group 5, after bleaching, the sealant was removed by polishing. Surface microhardness was measured and the data were analyzed using one-way ANOVA and Tukey tests (α=0.05) . Results: The microhardness values of groups 2 to 4 were significantly lower than that of group1 ( p < 0.05). There was no significant difference among groups 1, 5, 6 and 7 ( p > 0.05). Conclusion: The combined bleaching regimen used in this study had a substantial negative effect on methacrylate and sealed methacrylate composites but not on Silorane composite. Polishing following the bleaching on the sealed composite yielded a hardness value similar to that of unsealed methacrylate composite (control).
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نویسندگان مقاله f شفیعی | f shafiei
dept. of operative dentistry, biomaterial research center, school of dentistry, shiraz uni


s دوست فاطمه | s doustfatemeh
undergraduate student, school of dentistry, shiraz university of medical sciences, shiraz, iran.

سازمان اصلی تایید شده: دانشگاه علوم پزشکی شیراز (Shiraz university of medical sciences)

نشانی اینترنتی http://dentjods.sums.ac.ir/index.php/JDSUMS/article/view/5
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زبان مقاله منتشر شده en
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نوع مقاله منتشر شده Original Article
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