Espectrofotometria e diferentes materiais restauradores provisórios: análise da estabilidade de cor

• Autor(a) principal: Minani, Luiz Miguel [UNESP]
• Data de Publicação: 2013
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/149508; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2017-01-27/000857025.pdf
• topic: Espectrofotometria; Cor; Resinas acrílicas; Spectrophotometry

The aim of this study was to evaluate the color change three bis-acryl resins (Luxatemp - DMG, Protemp 4 - 3M ESPE, Structur - Voco) and a self-curing resin (Dencor - Classic) in periods of 2, 5, 7 and 15 days respectively. A 120 samples were prepared (n = 120) that were polished using a polishing machine to get the highest possible surface smoothness. After were made to color readings to obtain baseline would serve as a reference for the study. Thus done by initial reading, the samples were immersed in various solutions containing artificial saliva with coffee, artificial saliva with Coke© and only artificial saliva. The color measurement was made from the CIE L*a*b* system and color variation (ΔE) obtained by formula ΔE = [(ΔL)2 + (Δa)2 + (Δb)2]1/2. The results showed that the resins based on methyl methacrylate (Dêncor) had greater color stability when compared to the bis-acryl resins, the solutions were immersed in coffee which had higher color change for all resins and that the resin Structur was the biggest change with ΔE = 7.071. The groups immersed in Coke© more artificial saliva showed clinically acceptable changes. The samples immersed in artificial saliva showed less variation, showing no change clinically unacceptable. It can be concluded that solutions containing coffee showed greater color change, based resin of methyl methacrylate are more stable compared to bis-acryl resins and immersion time is a decisive factor for the color change