Color stability of silorane-based composites submitted to accelerated artificial ageing—An in situ study

• Published in: Journal of dentistry Vol. 39; pp. e18 - e24
• Main Authors: de Carvalho Panzeri Pires-de-Souza, Fernanda, Garcia, Lucas da Fonseca Roberti, Roselino, Lourenço de Moraes Rego, Naves, Lucas Zago
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.07.2011
• Subjects: Animals; Cattle; Color; Color stability; Composite Resins - chemistry; Dental Restoration Wear; Dental Stress Analysis; Dentistry; Low-shrinking composite; Materials Testing; Random Allocation; Silorane; Siloxanes; Surface degradation; Surface Properties; Time Factors; Silorane; Surface degradation; Low-shrinking composite; Color stability
• ISSN: 0300-5712; 1879-176X
• DOI: 10.1016/j.jdent.2011.03.003

Abstract Objectives To assess the in situ color stability, surface and the tooth/restoration interface degradation of a silorane-based composite (P90, 3M ESPE) after accelerated artificial ageing (AAA), in comparison with other dimethacrylate monomer-based composites (Z250/Z350, 3M ESPE and Esthet-X, Dentsply). Methods Class V cavities (25 mm2 × 2 mm deep) were prepared in 48 bovine incisors, which were randomly allocated into 4 groups of 12 specimens each, according to the type of restorative material used. After polishing, 10 specimens were submitted to initial color readings (Easyshade, Vita) and 2 to analysis by scanning electronic microscopy (SEM). Afterwards, the teeth were submitted to AAA for 384 h, which corresponds to 1 year of clinical use, after which new color readings and microscopic images were obtained. The values obtained for the color analysis were submitted to statistical analysis (1-way ANOVA, Tukey, p < 0.05). Results With regard to color stability, it was verified that all the composites showed color alteration above the clinically acceptable levels (Δ E ≥ 3.3), and that the silorane-based composite showed higher Δ E (18.6), with a statistically significant difference in comparison with the other composites ( p < 0.05). The SEM images showed small alterations for the dimethacrylate-based composites after AAA and extensive degradation for the silorane-based composite with a rupture at the interface between the matrix/particle. Conclusion It may be concluded that the silorane-based composite underwent greater alteration with regard to color stability and greater surface and tooth/restoration interface degradation after AAA.