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Carbamide peroxide bleaching agents: effects on surface roughness of enamel, composite and porcelain

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Abstract

This study examined the effect of 10 and 35% carbamide peroxide bleaching agents on the surface roughness of enamel, feldspathic porcelain, and microfilled and microhybrid composite resins. Standardized cylindrical specimens were prepared for restorative materials. Enamel samples were obtained from buccal and lingual surfaces of human molars. Samples from each substrate were divided in three subgroups (n=10), according to surface treatment: distilled water (control), and 10 and 35% carbamide peroxide. The 10% agent was applied 3 h daily and the 35% agent was applied for 30 min/week, at 37°C, during 21 days. Control samples remained stored in distilled water, at 37°C. Roughness measurements (Ra, μm) were made at 24 h and repeated after 7, 14 and 21 days of exposure. Data were analyzed using ANOVA (split-plot design) and Tukey's test (5% significance level). Samples from control groups showed no significant alteration during all test periods, while for exposure to 10% agent, only the porcelain presented a rougher surface after 21 days (p<0.05). For the 35% product, roughness means significantly increased during the first and second weeks for enamel (p<0.05), and after 21 days for porcelain (p<0.05) and for the microhybrid composite (p<0.05). Microfilled samples showed no significant alteration throughout the 21-day period, regardless of the surface treatment.

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Authors and Affiliations

  1. Department of Restorative Dentistry, Dental Materials Area, Piracicaba School of Dentistry, State University of Campinas, 901, Limeira Av.,, 13414-903, Areião, Piracicaba SP, Brazil

    R. R. Moraes, L. F. J. Schneider & L. Correr Sobrinho

  2. Department of Restorative Dentistry, School of Dentistry, Federal University of Pelotas. 457, Gonçalves Chaves St.,, 96015-560, Centro, Pelotas RS, Brazil

    J. L. M. Marimon, G. B. Camacho & M. Bueno

Authors
  1. R. R. Moraes
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  2. J. L. M. Marimon
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  3. L. F. J. Schneider
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  4. L. Correr Sobrinho
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  5. G. B. Camacho
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  6. M. Bueno
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Correspondence to M. Bueno.

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Moraes, R.R., Marimon, J.L.M., Schneider, L.F.J. et al. Carbamide peroxide bleaching agents: effects on surface roughness of enamel, composite and porcelain. Clin Oral Invest 10, 23–28 (2006). https://doi.org/10.1007/s00784-005-0016-1

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  • DOI: https://doi.org/10.1007/s00784-005-0016-1

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