Ion release from a composite resin after exposure to different 10% carbamide peroxide bleaching agents |
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Authors: | Renata Plá Rizzolo Bueno Paloma Salomone Viaro Paulo Cícero Nascimento Roselaine Terezinha Pozzobon |
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Institution: | Post Graduate Program in Dental Sciences, Federal University of Santa Maria, Santa Maria, RS, Brazil. |
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Abstract: | ObjectiveThis in vitro study evaluated the influence of two 10% carbamide
peroxide bleaching agents - a commercial product (Opalescence PF; Ultradent
Products, Inc.) and a bleaching agent prepared in a compounding pharmacy - on the
chemical degradation of a light-activated composite resin by determining its
release of ions before and after exposure to the agents. Material and MethodsThirty composite resin (Filtek Z250; 3M/ESPE) samples were divided into three
groups: group I (exposed to Opalescence PF commercial bleaching agent), group II
(exposed to a compounded bleaching agent) and group III (control - Milli-Q water).
After 14 days of exposure, with a protocol of 8 h of daily exposure to the
bleaching agents and 16 h of immersion in Milli-Q water, the analysis of ion
release was carried out using a HP 8453 spectrophotometer. The values were
analyzed statistically by ANOVA, Tukey''s test and the paired t-tests. The
significance level was set at 5%. ResultsAfter 14 days of the experiment, statistically significant difference was found
between group II and groups I and III, with greater ion release from the composite
resin in group II. ConclusionsThe compounded bleaching agent had a more aggressive effect on the composite resin
after 14 days of exposure than the commercial product and the control (no
bleaching). |
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Keywords: | Composite resins Peroxides Dental materials |
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