Abstract
ABSTRACT Objective The bleaching agents may interact with restorative materials, such as dental amalgam, providing an increase mercury ions (Hg) release, whose toxic effect is known. Whereas many patients have amalgam restorations (AR) and seek bleaching treatments, the present study aimed to evaluate in vitro the amount of Hg released from AR made with spherical alloy, after being subjected to different concentrations of carbamide peroxide (CP) for home bleaching. Methods 40 class I AR were prepared in bovine teeth. Afterthe restoration, the samples were randomly allocated into 4 groups (n = 10): C (control group), CP10 (CP 10%) CP15 (CP 15%) CP20 (CP 20%) and its treatments were simulated for 14 days for 6 hours daily. The Hg ions released was measured by energy dispersive X-ray spectroscopy (EDS) and surface changes were assessed in the Scanning Electron Microscope (SEM). Hg levels (percent mass) were recorded and the differences were statistically analyzed using the Kruskal-Wallis test and Dunn’s “Post hoc” test. Results Statisticalanalysis showed the bleaching treatment resulted in a higher Hg release (p <0.05), although no visible changes were identified in micrographs when comparing the control group with the other groups (CP10, CP15, CP20). Conclusion Increased Hg release may be observed during simulated home bleaching.
Highlights
Dental bleaching has become very popular in dentistry [1] and is considered as an effective and non-invasive treatment [2,3]
The bleaching treatment resulted in an increase in Hg release when compared to the control group
There were no differences between the experimental groups (CP10, CP15 and CP20)
Summary
Dental bleaching has become very popular in dentistry [1] and is considered as an effective and non-invasive treatment [2,3]. Many patients undergoing home bleaching have dental amalgam restorations, becoming the possible increase of Hg release a concern leading to the deleterious effects of this metal, including the development of chronic diseases [20]. As far as this problem is concerned, the studies mostly use amalgam samples, not simulated restorations, which can give erroneous results when it is considered clinically. The present study aimed to evaluate the amount of Hg released from amalgam restorations made with spherical alloy, after being subjected to different concentrations of CP for home bleaching
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