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- Title
Changes in the stiffness of demineralized dentin following application of tooth whitening agents.
- Authors
Berger, Sandrine Bittencourt; Pavan, Sabrina; Vidal, Cristina de Mattos Pimenta; Santos, Paulo Henrique Dos; Giannini, Marcelo; Bedran-Russo, Ana Karina
- Abstract
Objective . The purpose of this study was to evaluate the effect of the bleaching agents on the elastic modulus of bovine demineralized dentin matrix (EMDM). Materials and methods. Eighty-five slices were obtained from 17 bovine teeth. The slices were divided randomly into five experimental groups ( n == 17): unbleached control group (CG), 4% hydrogen peroxide (HP4), 4% hydrogen peroxide ++ 0.05% Ca (HP4 ++ Ca), 7.5% hydrogen peroxide ++ ACP (HP7.5) and 10% carbamide peroxide (CP10). The HP4, HP4 ++ Ca and CP10 groups were treated with the bleaching agents for 8 h/day (14 days), while the samples of HP7.5 group were exposed to bleaching agent for 30 min twice a day (14 days). The CG was kept in 100% humidity. After bleaching treatments, the enamel of the samples was removed and 85 dentin beams (0.5 × 1.7 × 7.0 mm) were prepared. Afterwards, the beams were immersed in 10% phosphoric acid solution (5 h) and rinsed with water (10 min). The beams were tested after 24 h, 7 and 14 days of storage in distilled water, using three-point bend method. Data were statistically analyzed using ANOVA and Fisher's test. Results. All bleaching treatments reduced the EMDM. After 14 days post-bleaching, the EMDM increased for HP4 and HP4++Ca groups. Conclusions. The use of bleaching agents promoted a decrease in EMDM, which indicates that the bleaching treatment interacts with the dentin organic matrix. The EMDM measurement for the specimens of the 7.5% hydrogen peroxide group that were immersed in water at 14 days post-bleaching did not recover the EMDM values when compared to the control group.
- Subjects
TOOTH analysis; STIFFNESS (Mechanics); TOOTH whitening; CONTROL groups; ANALYSIS of variance; HYDROGEN peroxide
- Publication
Acta Odontologica Scandinavica, 2012, Vol 70, Issue 1, p56
- ISSN
0001-6357
- Publication type
Article
- DOI
10.3109/00016357.2011.575176