Changes in surface roughness and color stability of two composites caused by different bleaching agents

Brazilian Dental Journal

Anna Paula Kalix França Mendes²  Marcos De Oliveira Barceleiro¹  Rodrigo Sant'anna Aguiar Dos Reis¹  Lucilei Lopes Bonato¹  Kátia Regina Hostílio Cervantes Dias² 

[1] ,State University of Rio de Janeiro Dental School Department of DentistryRio de Janeiro RJ ,Brazil

关键词: color stability;    roughness;    composite resins;    bleaching;   

DOI  :  10.1590/S0103-64402012000600006

来源: SciELO

【 摘 要 】

The objective of this study was to evaluate the effect of two bleaching agents (10% and 35% hydrogen peroxide) on the color stability and surface roughness of two composites, one nanohybrid and one nanoparticle. Specimens were polished, aged, stained, bleached and polished again. The action of the bleaching agents on the composites was analyzed using a profilometer (surface roughness) and a spectrophotometer (color stability). The effect of polishing the composites on the surface roughness and the resumption of the composite color was also evaluated. The results were analyzed statistically by ANOVA and Tukey's test at 5% significance level. The analysis indicated that the nanohybrid composite was more affected by staining. The bleaching agents were not able to promote bleaching of either composite over the evaluation period. Surface polishing returned nanohybrid composite to its original color condition, which did not occur for the nanoparticle composite. Additionally, polishing did not return the surface roughness of either composite to its original value. It may be concluded that polishing surface after bleaching should not be the treatment of choice, as it was not possible to reverse the roughness of the composites to their original values, suggesting that a more extensive and irreversible degradation might have occurred.

【 授权许可】

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