Efeito de diferentes soluções ácidas no comportamento da luz de restaurações de cerâmica de dissilicato de lítio

• Autor(a) principal: Watanabe, Denis [UNESP]
• Data de Publicação: 2016
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/155192; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2017-05-03/000880685.pdf
• topic: Cor; Cerâmica; Cerâmicas odontológicas; Fenômenos ópticos; Estética dentária; Color

The maintenance of optical characteristics of ceramic materials is critical, since pH, and temperature alterations, in an environment such as the oral cavity, can degrade this material, leading to treatment failure. Purpose. The purpose of this study was to evaluate the color stability (ΔE), translucency parameter, and contrast ratio of the lithium disilicate ceramic exposed to commonly used potentially colorant solutions. Material and Methods. Fifty lithium disilicate samples were prepared, and divided into 5 groups, according to the immersion solution (artificial saliva, orange juice, Coca-Cola, coffee, and red wine). Immersions in the acidic beverages were alternated with immersion in artificial saliva, which was performed in a thermocycler. The control group was immersed in artificial saliva at 37ºC, throughout the immersion period. After 168 hours of immersion, color parameters were assessed by a spectrophotometer, and calculated by using the CIELAB system, on 2 backgrounds (black and white), and in 2 moments: before (T0) and after (Tf) thermocycling. Data were submitted to analysis of variance followed by the Tukey HSD test (α=.05). Results. Greater color change (ΔE) was observed after immersion in orange juice and cola. Regarding the translucency parameter and contrast ratio, the immersion in coffee resulted in greater opacity and lower translucency of the material. Conclusions. Alterations in color stability, translucency parameter, and contrast ratio of the lithium disilicate ceramic were observed, according to the acidic solutions tested. Clinical Implications. The results of this study suggest that the type of commonly used acidic beverage is an important factor influencing the optical behavior of lithium disilicate ceramics