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Influence of bleaching therapy and induced aging on surface color, gloss, roughness and microhardness of resin composites

Grant number: 12/19223-7
Support type:Regular Research Grants
Duration: September 01, 2013 - August 31, 2015
Field of knowledge:Health Sciences - Dentistry - Dental Materials
Principal Investigator:Eduardo Bresciani
Grantee:Eduardo Bresciani
Home Institution: Instituto de Ciência e Tecnologia (ICT). Universidade Estadual Paulista (UNESP). Campus de São José dos Campos. São José dos Campos , SP, Brazil
Assoc. researchers:Alessandra Buhler Borges ; Carlos Rocha Gomes Torres ; Taciana Marco Ferraz Caneppele


Bleaching procedures are frequent in esthetic dentistry. Resin composites undergo a certain amount of surface degradation of their organic matrix, resulting in possible decrease of mechanical and optic properties. Although initial clinical changes might not be noticed after bleaching therapies, the long-term influences of this treatment on resin composite surface properties are still not known. The objective of the present study is to assess in vitro the influence of bleaching therapy associated with induced aging on color, gloss, roughness and microhardness of microparticle and nanohybrid resin composites. Material e Methods: One hundred and twenty specimens of each resin composite (Durafill - Heraeus Kulzer / Filtek Z350 XT - 3M ESPE, microparticule and nanohybrid reins, respectively) will be fabricated with dimensions of 3mm in diameter and 3mm in thickness. Specimens will be divided into three main groups: with no bleaching therapy, with bleaching therapy using 35% hydrogen peroxide, and with bleaching therapy using 16% carbamide peroxide. The main groups will be further divided into two groups, one receiving inducing aging by light and the other water aging (n=20). Half of each final group (n=10) will have color and surface gloss assessed and the other half (n=10) roughness and microhardness assessments. The parameters will be assessed at baseline, after the bleaching therapy (in case bleaching was performed), and after the proposed aging therapy. Data will be assessed for normality distribution and submitted to variance and multiple comparison tests. The level of significance will be set at 5%. (AU)