Effect of Short- and Long-term Use of Home and In-Office Bleaching with Carbamide Peroxide and Hydrogen Peroxide on Enamel Microhardness

Authors

Nazila Ameli, Department of Orthodontics, Dental School, Semnan University of Medical Sciences, Semnan, IranFollow
Niloofar Kianvash Rad, Department of Cosmetic Dentistry, Dental School, Semnan University of Medical Sciences, Semnan, IranFollow
Farzane Nikpour, Student Research Committee, Dental School, Semnan University of Medical Sciences, Semnan, IranFollow
Raheb Ghorbani, Social Determinants of Health Research Center , Semnan University of Medical Sciences, Semnan, Iran; Department of Epidemiology and Statistics, Semnan University of Medical Sciences, Semnan, IranFollow
Shadi Mohebi, Orthodontic Research Fellow at Bolton Brush Growth Study Center, Case Western Reserve University, Ohio, USAFollow

Abstract

Bleaching is a well-known esthetic dental treatment performed to lighten the tooth shade. Among different cosmetic dental procedures, including direct and indirect tooth-colored restorations, bleaching is likely the most conservative approach. Bleaching has been accepted well by patients and proven as a safe and effective approach. Objective: Tooth bleaching can be conducted at home or in offices. This study was performed to compare the enamel microhardness before bleaching and one and eight weeks after the application of different bleaching agents. Methods: Forty human premolars were randomly divided into four groups, and their buccal surface underwent a Vickers microhardness test before and after bleaching. Bleaching was performed with 40% hydrogen peroxide (HP) in-office bleaching agent (n = 10), 15% HP at-home bleaching agent (n = 10), and 15% carbamide peroxide (CP) at-home bleaching agent (n = 10) for two weeks. Ten samples were stored in artificial saliva and set as the control group. The microhardness of the samples was measured again one and eight weeks after bleaching. Results: The microhardness significantly decreased in the four groups one week after bleaching. Conclusion: The enamel microhardness was temporarily decreased by in-office bleaching. However, the microhardness increased with time and returned to the baseline value. Although the enamel microhardness initially reduced, it increased eight weeks after 15% CP at-home bleaching agent was applied.

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Recommended Citation

Ameli, N., Kianvash Rad, N., Nikpour, F., Ghorbani, R., & Mohebi, S. Effect of Short- and Long-term Use of Home and In-Office Bleaching with Carbamide Peroxide and Hydrogen Peroxide on Enamel Microhardness. J Dent Indones. 2020;27(2): 50-55