Colour stability, staining and roughness of silorane after prolonged chemical challenges Ana Raquel Benetti a, *, Vivian Cristiane Bueno Ribeiro de Jesus b , Natan Luiz Martinelli c , Renata Corre ˆa Pascotto d , Regina Ce ´lia Poli-Frederico e a School of Dentistry, University of Copenhagen, Nørre Alle ´ 20, 2200 Copenhagen N, Denmark b Rua Jose ´ Abraha ˜o Keide 528, 86730-000 Astorga, PR, Brazil c Rua Mario Giovanetti 348, 86041-440 Londrina, PR, Brazil d School of Dentistry, State University of Maringa ´, Av. Mandacaru 1550, 87080-000 Maringa ´, PR, Brazil e School of Dentistry, University North of Parana ´, Av. Paris 675, 86041-120 Londrina, PR, Brazil j o u r n a l o f d e n t i s t r y x x x ( 2 0 1 3 ) x x x – x x x a r t i c l e i n f o Article history: Received 6 January 2013 Received in revised form 16 August 2013 Accepted 1 October 2013 Available online xxx Keywords: Composite resins Colour Discolouration Roughness a b s t r a c t Objectives: To investigate the effect of prolonged chemical challenges on colour stability, staining susceptibility, and roughness of a silorane composite material when compared to methacrylate-based composites. Methods: Initial colour and roughness were registered for specimens fabricated from meth- acrylate or silorane composites. Specimens were individually stored at 37 8C in 0.02 N citric acid, 0.02 N phosphoric acid, 75% ethanol or distilled water for 7, 14, 21 and 180 days, when new measurements were performed. A staining test was performed after the chemical challenge by immersion in coffee during 3 weeks at 37 8C. Colour changes were character- ized using the CIEL*a*b* colour system. Data were submitted to analysis of variance for repeated measures, two-way analysis of variance and Tukey’s multiple comparison test (a = 0.05). Results: Colour changes on the methacrylate-based resins were considered acceptable (although significantly different) after immersion in water, citric acid, phosphoric acid or ethanol, but were unacceptable for the silorane composite immersed in ethanol for 180 days. The methacrylate-based resins stored in ethanol were significantly more stained by coffee than those stored in other media. The silorane composite demonstrated no staining, but increased roughness, when compared to the methacrylate-based resins. Conclusions: No effect of the immersion solution was noticed on roughness of the investi- gated materials. Ethanol influenced colour stability and staining susceptibility differently for the methacrylate-based and silorane composites. Clinical significance: The knowledge of how acids and solvents affect the properties of tooth- coloured restorative materials is one of the decision-making criteria for the selection of a restorative material. # 2013 Elsevier Ltd. All rights reserved. * Corresponding author. Tel.: +45 3532 6584; fax: +45 3532 6505. E-mail address: arbe@sund.ku.dk (A.R. Benetti). JJOD-2157; No. of Pages 7 Please cite this article in press as: Benetti AR, et al. Colour stability, staining and roughness of silorane after prolonged chemical challenges. Journal of Dentistry (2013), http://dx.doi.org/10.1016/j.jdent.2013.10.004 Available online at www.sciencedirect.com ScienceDirect journal homepage: www.intl.elsevierhealth.com/journals/jden 0300-5712/$ – see front matter # 2013 Elsevier Ltd. All rights reserved. http://dx.doi.org/10.1016/j.jdent.2013.10.004