ABSTRACT
Aim: To evaluate the color stability of acrylic and bis-acrylic resins after immersion in 3 staining solutions. Methods: Forty-eight samples (10 x 2 mm) of each provisional restorative material (Duralay, Dencrilay, Structur 2 and Protemp 4) were fabricated and distributed into four groups (n = 12): G1 distilled water (control group); G2 a cola flavored soft drink; G3 wine and G4 coffee. The specimens were immersed for seven days at 37°C in the solutions, which were changed every 24 hours. The color of all specimens was measured with a spectrophotometer (VITA Easyshade Advance) before (T0) and after immersion (T1), and the color changes (ΔE) were calculated. Nonparametric Kruskal-Wallis tests were used, followed by Dunn's test with a significance level of 5%. Results: For the acrylic resins (Duralay and Dencrilay), the largest color change values were obtained in group G4 coffee, whereas in the bis-acrylic resins (Protemp 4 and Structur 2), the largest color difference was observed in groups G3 wine and G4 coffee. The acrylic resins showed statistically significantly less color change than the bis-acrylic resins. Conclusions: The coffee and the wine promoted larger color changes in the provisional prosthetic materials tested in this study. The acrylic resins showed more color stability than the bis-acrylic resins
Subject(s)
Acrylic Resins , Color , Dental Restoration, TemporaryABSTRACT
Um paciente de 68 anos, portador de diabetes mellitus de longa evoluçäo, apresenta otalgia esquerda e edema periauricular progressivos. Posteriormente, surgem sinais de paralisia facial periférica e secreçäo purulenta do mesmo lado. As culturas do exsudato mucopurulento que drenavam pelo conduto auditivo externo esquerdo deram crescimento a Pseudomonas aeruginosa. Ao exame otoscópico, foi detectado tecido de granulaçäo que impedia a visualizaçäo da membrana do tímpano. Com o diagnóstico de otite externa maligna por P. aeruginosa, o enfermo foi internado, iniciando metodologia diagnóstica para avaliaçäo da extensäo do processo e terapêutica específica. Com intuito de uma atualizaçäo, faz-se uma revisäo da literatura a respeito desta incomum entidade