TY - JOUR AU - de Andrade, Isabel Cristina G. Bandeira; Basting, Roberta Tarkany; Rodrigues, José Augusto; do Amaral, Flávia Lucisano Botelho; Turssi, Cecilia Pedroso; França, Fabiana Mantovani Gomes TI - Microhardness and color monitoring of nanofilled resin composite after bleaching and staining SN - 1305-7456 SN - 1305-7464 PY - 2014 JO - Eur J Dent JF - European Journal of Dentistry LA - EN VL - 08 IS - 02 SP - 160 EP - 165 DA - 2019/09/24 KW - Bleaching agents KW - color change KW - laboratory research KW - microhardness KW - staining solutions KW - nanofilled composites AB - Objectives: The present study aimed to investigate the effect of staining solutions on microhardness and shade changes of a nanofilled resin composite, which had been previously in contact with bleaching agents. Materials and Methods: A total of 135 disk-shaped specimens (10 mm × 2 mm) were fabricated with a nanofilled resin (Filtek Supreme) and photocured with a Light Emission Diode (LED) unit and then allocated into three groups to be bleached with 10% or 16% carbamide peroxide (CP) bleaching agents or a 35% hydrogen peroxide (HP) product. Following bleaching, specimens within each group were subdivided into three groups to be immersed in coffee, red wine or distilled water. Microhardness and color were monitored at baseline, after bleaching and after staining. Results: Analysis of variance for split-plot design showed lower microhardness values when the composite had been in contact with HP (P < 0.0001). The specimens immersed in red wine and coffee provided lower microhardness values than those immersed in distilled water, regardless of the bleaching agent to which the composites were previously exposed. Kruskal Wallis and Dunn tests demonstrated that the composite was lighter after bleaching with a 35% HP agent (P < 0.0500). Conclusion: The composite was darker as a result of being immersed either in red wine or coffee, regardless of the bleaching agent. PB - Thieme Medical and Scientific Publishers Private Ltd. DO - 10.4103/1305-7456.130586 UR - http://www.thieme-connect.com/products/ejournals/abstract/10.4103/1305-7456.130586 ER -