de Andrade Isabel Cristina G Bandeira, Basting Roberta Tarkany, Rodrigues José Augusto, do Amaral Flávia Lucisano Botelho, Turssi Cecilia Pedroso, França Fabiana Mantovani Gomes
Department of Restorative Dentistry, Regional University of Blumenau, Blumenau, SC, Brazil.
Department of Restorative Dentistry, São Leopoldo Mandic Institute and Dental Research Center, Campinas, SP, Brazil.
Eur J Dent. 2014 Apr;8(2):160-165. doi: 10.4103/1305-7456.130586.
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.
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.
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).
The composite was darker as a result of being immersed either in red wine or coffee, regardless of the bleaching agent.
本研究旨在调查染色溶液对先前已接触过漂白剂的纳米填充树脂复合材料的显微硬度和颜色变化的影响。
用纳米填充树脂（Filtek Supreme）制作135个圆盘形试件（10毫米×2毫米），并用发光二极管（LED）装置光固化，然后分为三组，分别用10%或16%的过氧化脲（CP）漂白剂或35%的过氧化氢（HP）产品进行漂白。漂白后，每组试件再细分为三组，分别浸入咖啡、红酒或蒸馏水中。在基线、漂白后和染色后监测显微硬度和颜色。
裂区设计的方差分析表明，复合材料接触HP后显微硬度值较低（P<0.0001）。无论复合材料先前接触何种漂白剂，浸入红酒和咖啡中的试件的显微硬度值均低于浸入蒸馏水中的试件。Kruskal Wallis和Dunn检验表明，用35%的HP剂漂白后复合材料颜色变浅（P<0.0500）。
无论使用何种漂白剂，复合材料浸入红酒或咖啡后都会变深。
