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Shafiei, F., Doustfatemeh, S.. (1392). Effect of a Combined Bleaching Regimen on the Microhardness of a Sealed Methacrylate-based and a Silorane-based Composite. سامانه مدیریت نشریات علمی, 14(3), 111-117.
F. Shafiei; S. Doustfatemeh. "Effect of a Combined Bleaching Regimen on the Microhardness of a Sealed Methacrylate-based and a Silorane-based Composite". سامانه مدیریت نشریات علمی, 14, 3, 1392, 111-117.
Shafiei, F., Doustfatemeh, S.. (1392). 'Effect of a Combined Bleaching Regimen on the Microhardness of a Sealed Methacrylate-based and a Silorane-based Composite', سامانه مدیریت نشریات علمی, 14(3), pp. 111-117.
Shafiei, F., Doustfatemeh, S.. Effect of a Combined Bleaching Regimen on the Microhardness of a Sealed Methacrylate-based and a Silorane-based Composite. سامانه مدیریت نشریات علمی, 1392; 14(3): 111-117.

Effect of a Combined Bleaching Regimen on the Microhardness of a Sealed Methacrylate-based and a Silorane-based Composite

Journal of Dentistry
مقاله 4، دوره 14، شماره 3، آذر 2013، صفحه 111-117    اصل مقاله (122.6 K)
نوع مقاله: Original Article
نویسندگان
F. Shafiei1؛ S. Doustfatemeh* 2
1Dept. of Operative Dentistry, Biomaterial Research Center, School of Dentistry, Shiraz Uni
2Undergraduate Student, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
چکیده
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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