Análise por imagem digital dos níveis de cinza de fibras de reforço associadas a uma resina composta
Abstract
Objetivo: Mensurar a densidade óptica das fibras de reforço Connect, Ribbond e Interlig incluídas em resina composta Filtek Z250, no sistema DenOptix®. Materiais e método: Foram confeccionados 10 blocos de resina composta associadas a cada tipo de fibra e dois blocos de resina Z250 pura (controle não-reforçado), totalizando 32 corpos-de-prova. Foram obtidas 3 radiografias digitais de cada corpo-de-prova, sobre uma placa óptica do sistema DenOptix®, para cada posição: (A) face lateral da fibra exposta aos raios-X; (B) face tramada da fibra exposta aos raios-X. Em cada uma foram realizadas 3 leituras ópticas dos níveis de cinza em cada corpo-de-prova, em pontos aleatórios, sendo obtida uma média. Os valores médios dos níveis de cinza foram analisados pelo teste t de Student, ANOVA e teste de Tukey, ao nível de significância de 1%. Resultados e conclusões: Com relação à associação da resina + fibra na posição (A), observou-se a maior média de níveis de cinza para a resina pura, seguido por resina + Connect, resina + Interlig (que não diferiram entre si), e resina + Ribbond. Com relação à associação da resina + fibra na posição (B), observou-se que a resina pura apresentou maior média, seguida por resina + Connect, resina + Interlig e resina + Ribbond, sendo que as duas últimas não foram diferentes entre si. Os resultados sugerem que os níveis de cinza variaram em função do tipo de fibra de reforço e da posição na radiografia.
UNITERMOS: resina; fibra de reforço; imagem digital; radiografia
SUMMARY
Objective: To measure the optical density of reinforcement fibers (Connect, Ribbond, and Interlig), which were embedded in composite resin Filtek Z250, using the system DenOptix®. Materials and methods: Ten reinforced-fiber composite resin blocks were fabricated with each type of fiber. Two other blocks were fabricated only with the composite resin (unreinforced control). The total of experimental specimens was 32. Three digital radiographs were obtained for each specimen on the DenOptix® imaging plate, for both positions: (A) lateral face of the fiber exposed to the X-rays; (B) frontal face of the fiber exposed to the X-rays. On each radiograph image, three measurements of the grey levels of the specimen were performed in random sites and averaged. The mean values of the grey levels were analyzed by Student’s t test, ANOVA, and Tukey’s test at the 1% level of significance. Results and conclusions: In relation to the association of composite resin + fiber in (A), the highest mean of grey levels was found for the control group, followed by composite resin + Connect, composite resin + Interlig (which were not statistically different), and composite resin + Ribbond. In relation to the association of composite resin + fiber in (B), the control group showed the highest mean, followed by composite resin + Connect, composite resin + Interlig, and composite resin + Ribbond (the two latter were not statistically different). The results suggest that the grey levels varied as a function of the type of fiber and position in the X-rays.
UNITERMS: resin; reinforcement fiber; digital image; radiography.
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