RESUMO
The esthetic demands of patients have encouraged the search for restorative materials increasingly similar to natural teeth. This requires knowledge on the optical properties of dental structures and restorative materials. This study comparatively evaluated the translucency/opacity and fluorescence of different brands of composite resins. Sixteen brands of composite resins shade A2 were randomly selected; specimens with 1mm thickness and 10mm diameter were fabricated with these resins and evaluated as to the optical properties, scored as high, medium and low translucency/opacity and fluorescence. Statistical analysis by the Kendall W testand Friedman test at a significance level of 5% revealed that the resins Opallis D, Four Season D, Concept E, Concept D, and Fill-Magic presented low translucency. Conversely, the resins Opallis E, Charisma, Tetric Ceram, Four Season E, Natural Look, Z350, and Z250 exhibited medium translucency/opacity, and resins Nova Charisma, Durafill, and Supreme XT presented high translucency. With regard to fluorescence, the resins Charisma, Z350, Supreme XT, and Z250 present low fluorescence. Medium fluorescence was observed for the resins Opallis E, Opallis D, Nova Charisma, Durafill, Natural Look, TPH Spectrum, Tetric Ceram, Four Season E, and Four Season D. The composite resins Concept E, Concept D, and Fill Magic presented high fluorescence. Based on these results, it is concluded that there are differences in the degree of translucency/opacity and fluorescence of different composite resins, which are possibly related to variations in their composition.
Devido à exigência estética, tem-se buscado materiais restauradores que se aproximem da aparência do dente natural. Para tal, é importante conhecer as propriedades ópticas tanto das estruturas dentais quanto dos materiais restauradores. Este estudo objetivou avaliar a translucidez/opacidade e fluorescência de 16 resinas compostas, na cor universal A2, selecionadas aleatoriamente, a partir das quais foram confeccionados corpos de prova, com 1mm de espessura e 10mm de diâmetro que foram submetidos a avaliação das propriedades ópticas, sendo classificados como alta, média e baixa translucidez/opacidade e fluorescência. Nos testes W de Kendall e ao teste de Friedman a 5% de significância, verificou-se que as resinas Opallis D, Four Season D, Concept E, Concept D e Fill Magic apresentaram baixa translucidez. As resinas Opallis E, Charisma, Tetric Ceram, Four Season E, Natural Look, Z350 e Z250 apresentaram média translucidez/opacidade e as resinas Nova Charisma, Durafill e Supreme XT, alta translucidez. Para fluorescência, as resinas Charisma, Z350, Supreme XT e Z250 apresentaram baixa fluorescência. As de média fluorescência foram Opallis E, Opallis D, Nova Charisma, Durafill, Natural Look, TPH Spectrum, Tetric Ceram, Four Season E e Four Season D. Por fim, as resinas compostas Concept E, Concept D e Fill Magic apresentam alta fluorescência. A partir dos resultados, conclui-se que existem diferenças nos graus de translucidez/opacidade e fluorescência nas diferentes resinas compostas testadas, o que, possivelmente, está relacionado às variações na composição das mesmas.
