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:: Volume 3, Issue 4 (11-2025) ::
cofs 2025, 3(4): 0-0 Back to browse issues page
The Effect of At-Home Bleaching on the Increase of Enamel Microcracks
Roshanak Yousefi , Mohammad Reza Malekipour , Mehrdad Kazemian , Mona Fatemeh Rabiei *
Department of Operative Dentistry, Faculty of Dentistry, Isf.c, Islamic Azad University, Isfahan, Iran
Abstract:   (73 Views)
Background: Tooth bleaching materials have the potential to alter both the organic and mineral components of dental tissues, which may in turn affect enamel surface morphology. This study aimed to evaluate the effect of at-home bleaching on the increase of Enamel Microcracks.
Materials and Methods: In this in vitro experimental study, 40 extracted anterior teeth were randomly divided into two groups. Baseline stereomicroscopic images of the buccal surfaces were captured to record the initial number of enamel microcracks. Each tooth was measured at multiple regions before and after bleaching to allow repeated assessments. Group 1 was treated with 15% carbamide peroxide, and Group 2 with 20% carbamide peroxide, for ten consecutive days. Each day, teeth in Group 1 were exposed to the bleaching agent for 6 hours, and teeth in Group 2 for 4 hours. Stereomicroscopic images were taken after treatment, and the number of microcracks was recorded in all regions. Data were analyzed using a repeated-measures ANOVA with α = 0.05.
Results: The mean number of enamel microcracks increased significantly in both groups after bleaching compared to baseline measurements (p < 0.001). No statistically significant difference was observed between the two concentrations in terms of microcrack formation (p = 0.687).
Conclusion: At-home bleaching with both 15% and 20% carbamide peroxide significantly increased the mean number of enamel microcracks. However, the extent of microcrack formation did not differ significantly between the two concentrations.
 
     
Type of Study: Research | Subject: Operative dentistry
Received: 2025/09/29 | Accepted: 2025/10/30 | Published: 2025/11/7
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Yousefi R, Malekipour M R, Kazemian M, Rabiei M F. The Effect of At-Home Bleaching on the Increase of Enamel Microcracks. cofs 2025; 3 (4)
URL: http://cofs.khuisf.ac.ir/article-1-116-en.html
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Volume 3, Issue 4 (11-2025) Back to browse issues page
Contemporary Orofacial Science Contemporary Orofacial Science
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