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Estudo comparativo de espectrofotómetros / colorímetros comerciais e experimentais para a medição fiável de cor em amostras laboratoriais
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| 1.47 MB | Adobe PDF |
Authors
Abstract(s)
Introdução: Com o aumento da demanda estética e subjetividade na perceção da cor, a utilização de métodos digitais para medição desta é imperativa, sendo fundamental o seu estudo em contexto laboratorial.
Objetivos: Avaliar e comparar a eficácia da medição de cor, utilizando três aparelhos diferentes, variando e percebendo a influência do tipo de resina composta (RC), cor, método de acabamento de superfície e do fundo utilizado.
Materiais e métodos: Foram testadas as RC 3MTMFiltekTMSupreme XTE (nanoparticulada) e 3MTMFiltek Z250 (microhíbrida), das quais se confecionaram 12 discos de cada na cor A1 (n=6) e A4 (n=6). Os 6 discos de cada grupo foram aleatoriamente alocados em 2 subgrupos consoante o acabamento. Em 3 foi realizada a fotopolimerização sobre uma matriz de Mylar, sem modificações adicionais, e nos outros 3 foi aplicado o protocolo de polimento com uma lixa de carbeto de silício (360 grit SiC). Posteriormente, foi avaliada a cor, com os equipamentos comerciais - SpectroshadeTM Micro e OptiShadeTM – sobre quatro fundos: preto, branco, cinza e frasaco em caixa preta, e um aparelho experimental (Sarspec Flex), de modo a comparar os valores obtidos. Os dados laboratoriais foram analisados com recurso ao programa SPSS 28.0, com um nível de significância de 5%.
Resultados: No Spectroshade, o tipo de RC foi significativo nos parâmetros a* e b* (p<0,001), enquanto no Optishade apenas no b* ( p<0,001). A variação da cor foi significativa ( p<0,001) em todos os aparelhos. A variação do fundo revelou significância nos aparelhos comerciais (p<0,001). A avaliação de cor apresentou diferenças significativas entre os aparelhos comerciais e o experimental ( p<0,001) nos parâmetros
L* e a* ( p<0,001).
Conclusões: Os aparelhos apresentaram variabilidade entre si, contudo, o fundo preto demonstrou maior concordância. São necessários mais estudos para a definição de uma padronização fiável na medição de cor em amostras laboratoriais de RC.
Introduction: With the increase in aesthetic demand and subjectivity in color perception, the use of digital methods to measure color is imperative, and its study in a laboratory context is essential. Objectives: Evaluate and compare the effectiveness of color measurement, using three different devices, varying and understanding the influence of the type of composite resin (CR), color, surface finishing method and the background used. Materials and Methods: Two CR were tested: 3MTMFiltekTMSupreme XTE (nanoparticulate) and 3MTMFiltekTMZ250 (microhybrid) of which 12 discs each were made in color A1 (n=6) and A4 (n=6). The 6 discs in each group were randomly allocated into 2 subgroups depending on the finish. In 3, photopolymerization was carried out on a Mylar matrix, without additional modifications, and in the other 3, the polishing protocol was applied with silicon carbide sandpaper (360 grit SiC). Subsequently, the color was evaluated using commercial equipment - SpectroshadeTM Micro and OptiShadeTM - on four backgrounds: black, white, gray and frasaco in a black box, and an experimental device (Sarspec Flex), in order to compare the values obtained. Laboratory data were analyzed using the SPSS 28.0 program, with a significance level of 5%. Results: In Spectroshade, the CR type was significant in parameters a* and b* (p<0.001), while in Optishade only in b* (p<0.001). The color variation was significant (p<0.001) in all devices. The background variation revealed significance in commercial devices (p<0.001). The color evaluation showed significant differences between the commercial devices and the experimental one (p<0.001) in the L* and a* parameters (p<0.001). Conclusion: The devices showed variability among themselves, however, the black background demonstrated greater agreement. More studies are needed to define a reliable standardization in color measurement in RC laboratory samples.
Introduction: With the increase in aesthetic demand and subjectivity in color perception, the use of digital methods to measure color is imperative, and its study in a laboratory context is essential. Objectives: Evaluate and compare the effectiveness of color measurement, using three different devices, varying and understanding the influence of the type of composite resin (CR), color, surface finishing method and the background used. Materials and Methods: Two CR were tested: 3MTMFiltekTMSupreme XTE (nanoparticulate) and 3MTMFiltekTMZ250 (microhybrid) of which 12 discs each were made in color A1 (n=6) and A4 (n=6). The 6 discs in each group were randomly allocated into 2 subgroups depending on the finish. In 3, photopolymerization was carried out on a Mylar matrix, without additional modifications, and in the other 3, the polishing protocol was applied with silicon carbide sandpaper (360 grit SiC). Subsequently, the color was evaluated using commercial equipment - SpectroshadeTM Micro and OptiShadeTM - on four backgrounds: black, white, gray and frasaco in a black box, and an experimental device (Sarspec Flex), in order to compare the values obtained. Laboratory data were analyzed using the SPSS 28.0 program, with a significance level of 5%. Results: In Spectroshade, the CR type was significant in parameters a* and b* (p<0.001), while in Optishade only in b* (p<0.001). The color variation was significant (p<0.001) in all devices. The background variation revealed significance in commercial devices (p<0.001). The color evaluation showed significant differences between the commercial devices and the experimental one (p<0.001) in the L* and a* parameters (p<0.001). Conclusion: The devices showed variability among themselves, however, the black background demonstrated greater agreement. More studies are needed to define a reliable standardization in color measurement in RC laboratory samples.
Description
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Keywords
Resinas compostas Cor Propriedades óticas Fundo