Abstract
This study evaluated the effect of tooth whitening on resin composites (RC) on roughness, microhardness and flexural strength. There were three RC: one Bulk Fill type resin (Filtek Bulk Fill) and two conventional, Filtek Z350 (Z350) and Z250 (Z250). Twenty-four bar-shaped specimens were made for each RC. First, the initial roughness and microhardness were evaluated; thus, the RC were subdivided into 3 other groups, according to treatments: control group (C), this did not receive bleaching treatment; home bleaching with 10% carbamide peroxide (10%CP) (Opalescence PF), 8h/14 days; home-office bleaching with 40% hydrogen peroxide (40%HP) (Opalescence Boost PF) 3 ´ 15 minutes for 3 days at 48 hour intervals. After treatments, roughness and microhardness were again evaluated and then the samples submitted to the three-point flexural test. Data were tabulated, normality assessed, then submitted to ANOVA followed Tukey’s test (p <0.05). The results showed that the bleaching change the roughness of RC, but 10%CP had a significant increase. The gel concentration does not influence microhardness and flexural strength. After bleaching, Z350 has a lower elastic modulus. Based in the results obtained, could be concluded that the different bleachings did not promote significant changes on the RC studied.
Highlights
The tooth bleaching technique is considered the most traditional one to change the color of the tooth element (Yu, et al, 2011) and (Souza, et al, 2020), the substances used, carbamide and hydrogen peroxides, may damage the tooth structure, as well as in restorative materials (Polydorou, et al, 2007) and (Berger, et al, 2013)
This study evaluated the effect of tooth whitening on resin composites (RC) on roughness, microhardness and flexural strength
The initial roughness and microhardness were evaluated; the RC were subdivided into 3 other groups, according to treatments: control group (C), this did not receive bleaching treatment; home bleaching with 10% carbamide peroxide (10%CP) (Opalescence PF), 8h/14 days; home-office bleaching with 40% hydrogen peroxide (40%HP) (Opalescence Boost PF) 3 15 minutes for 3 days at 48 hour intervals
Summary
The tooth bleaching technique is considered the most traditional one to change the color of the tooth element (Yu, et al, 2011) and (Souza, et al, 2020), the substances used, carbamide and hydrogen peroxides, may damage the tooth structure, as well as in restorative materials (Polydorou, et al, 2007) and (Berger, et al, 2013). Conventional composites (macroparticles) had inorganic quartz charge particles, strontium glass particles or barium; they had medium-sized particles from five to 12 μm and sometimes 100μm, a radioactivity minor than the dentine spite of the great durability. The microparticles have fumed silica or 0.04-μm-sized colloidal silica, which is 300 times smaller than quartz; they have mechanical and physical properties inferior to traditional composites. In order to supply the necessity of a universal restorative material, so as to provide mechanical consistency and the advantage of high polymer, nanohybrid (0.04 to 3.0 μm) and nanoparticle composites (5 to 70 nanometers) have been introduced on the market, enabling the advance of dental material radiopacity due to the use of nanotechnology, which enhanced the diagnose of secondary cavity and control of tooth restorative interface (Ilie, Bucuta & Draenert, 2013)
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