title: Assessment of the release of mercury from silver amalgam alloys exposed to different 10% carbamide peroxide bleaching agents.
abstract: This in vitro study assessed the amount of mercury (Hg) released from a silver amalgam alloy following the application of different 10% carbamide peroxide bleaching agents. A total of 30 specimens (2 mm thick x 4 mm in diameter) were stored in deionized water at 37°C for 7 days. Next, the control group (n = 10) remained in the deionized water for 15 days, while the remaining samples were exposed to 1 of 2 bleaching agents (n = 10) for 8 hours daily (total exposure = 120 hours); for the remaining 16 hours, specimens in the test groups were stored in deionized water at 37°C under relative humidity. After this period, the quantity of Hg in the deionized water was assessed (using atomic absorption spectrophotometry) and compared to the amount of Hg at baseline. The results indicate that exposing amalgam alloys to bleaching agents released greater amounts of Hg compared to exposing samples to deionized [corrected] water.
authors.affiliation: Federal University of Santa Maria, Rio Grande de Sul, Brazil.
authors.forename: Paloma
authors.initials: P
authors.lastname: Salomone
authors.forename: Renata Pla Rizzolo
authors.initials: RP
authors.lastname: Bueno
authors.forename: Rodrigo Farcili
authors.initials: RF
authors.lastname: Trinidade
authors.forename: Paulo Cicero
authors.initials: PC
authors.lastname: Nascimento
authors.forename: Roselaine Tezezinha
authors.initials: RT
authors.lastname: Pozzobon
mesh_terms: D057886:Bleaching Agents / Q000009:adverse effects / Q000737:chemistry*; D000077463:Carbamide Peroxide; D003722:Dental Alloys / Q000737:chemistry*; D003723:Dental Amalgam / Q000737:chemistry*; D008628:Mercury / Q000032:analysis*; D010545:Peroxides / Q000009:adverse effects / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D013054:Spectrophotometry, Atomic; D014073:Tooth Bleaching / Q000009:adverse effects*; D014508:Urea / Q000009:adverse effects / Q000031:analogs & derivatives* / Q000737:chemistry
chemical_list: D057886:Bleaching Agents; D003722:Dental Alloys; D010545:Peroxides; D000077463:Carbamide Peroxide; D012834:Silver; D003723:Dental Amalgam; D014508:Urea; D008628:Mercury