Volume 13, Issue 2 (Summer 2009)                   J Qazvin Univ Med Sci 2009, 13(2): 77-83 | Back to browse issues page

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Javaheri M, Jalali S. The effect of thiourea on shear bond strengths of composite to bleached enamel. J Qazvin Univ Med Sci. 2009; 13 (2) :77-83
URL: http://journal.qums.ac.ir/article-1-835-en.html
1- , Email: mjavaheri@qums.ac.ir
Abstract:   (5969 Views)
Background: Reduced composite-tooth bond strength after bleaching inhibits immediate tooth restoration. Objective: To determine the effect of thiourea as a free radical scavenger on shear bond strength of composite to bleached enamel. Methods: Enamel surfaces of 96 sound human premolars were randomly assigned to six experimental groups (n=12) which were bleached with %15 CP, and two control groups 1, 2 (n=12) bonded without bleaching. The specimens in groups 3 and 4 (n=24) were bonded 24 hours after bleaching. Groups 5 and 6 (n=24) were bleached with a mixture of %15 CP and thiourea followed by bonding. Groups 7 and 8 (n=24) were bleached, immersed in water and left for 1 week. In odd groups, single bond and in even groups Excite were used. Composite Cylinders were bonded and the shear bond strengths were determined 24 hours later. Data were subjected to one-way ANOVA and Tukey HSD at a significant levels of p<0.05. Findings: There was no statistically significant difference between diverse groups. Mean bond strength was lowest in groups 3 and 4 and highest mainly in group 8 and with a little decrease in group 5. Conclusion: Bleaching with 15% carbamid peroxide caused insignificant reduction in composite-enamel bond strengths in bonding either after 24 hours or one week following the application of 2 types of bonding agents. Application of thiourea in combination with bleaching agents may be useful for immediate composite restorations.
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Type of Study: Research | Subject: Dentisry

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