Microhardness of demineralized enamel following home bleaching and laser-assisted in office bleaching

Ghanbarzadeh, M. and Ahrari, F. and Akbari, M. and Hamzei, H. (2015) Microhardness of demineralized enamel following home bleaching and laser-assisted in office bleaching. Journal of Clinical and Experimental Dentistry, 7 (3). e405-e409.

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Abstract

Background: There is little data regarding the effect of tooth whitening on microhardness of white spot lesions. This study was conducted to investigate the effect of home-bleaching and laser-assisted in-office bleaching on microhardness of demineralized enamel. Material and Methods: Forty bovine incisors were selected and immersed in a demineralizing solution for 12 weeks to induce white spot lesions. Enamel blocks were prepared and randomly assigned to two groups of 20 each. The first group underwent home bleaching with 15 carbamide peroxide which was applied for 8 hours a day over a period of 15 days. In the second group, in-office bleaching was performed by 40 hydrogen peroxide and powered by irradiation from an 810 nm gallium-aluminum-arsenide (GaAlAs) diode laser (CW, 2W). This process was performed for 3 sessions every seven days, in 15 days. The specimens were stored in Fusayama Meyer artificial saliva during the experiment. Surface microhardness was assessed before and after the bleaching therapies in both groups. Results: Microhardness decreased significantly following both home bleaching and laser-assisted in-office bleaching (p < 0.05). There were no significant differences in hardness values among the two groups either before (p=0.131) or after (p=0.182) the bleaching procedures. Conclusions: Tooth whitening through home bleaching or laser-assisted in-office bleaching can result in a significant reduction in microhardness of white spot lesions. Therefore, it is suggested to take protective measures on bleached demineralized enamel. © Medicina Oral S. L.

Item Type: Article
Additional Information: Cited By :11 Export Date: 16 February 2020 Correspondence Address: Ahrari, F.; Dental Research Center, School of Dentistry, Mashhad University of Medical Sciences, Vakilabad Blvd, Iran; email: Farzaneh.Ahrari@gmail.com
Uncontrolled Keywords: Bleaching Demineralized enamel Home bleaching In-office bleaching Laser Microhardness White spot lesion
Subjects: WU Dentistry. Oral surgery
Divisions: Mashhad University of Medical Sciences
Depositing User: mr lib5 lib5
Date Deposited: 12 May 2020 08:51
Last Modified: 12 May 2020 08:51
URI: http://eprints.mums.ac.ir/id/eprint/18852

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