Efeito de diferentes fotopolimerizadores e meio de imersão na rugosidade e na cor de um compósito nanoparticulado
Effect of different light curing units and immersion media on roughness and color of a nanofill composite
Plaster, Suéllen Campos; Peixoto, Letícia Monteiro; Guedes, Ana Paula Albuquerque; Silva, Ana Paula Albuquerque Guedes Daniela Nascimento; Castro, Martha Chiabai Cupertino
Resumo
Introdução: O consumo excessivo de refrigerantes parece alterar as propriedades dos compósitos e essa alteração pode estar relacionada à unidade fotopolimerizadora. Objetivo: Avaliar a alteração da rugosidade superficial (ΔR) e da cor (ΔE) de um compósito polimerizado por diferentes fotopolimerizadores, imerso em água destilada ou Coca-Cola®. Metodologia: Sessenta amostras da resina nanoparticulada (FiltekMR Z350 XT, 3M) foram distribuídas de acordo com as diferentes unidades de fotopolimerização: a) luz halógena de quartzo-tungstênio-halogênio (QTH); b) Luz de Emissão Diodo - LED 1 com ponteira de polímero; c) LED 2 com ponteira de fibra ótica. Metade de cada grupo (n=10) foi mantida em água destilada ou imersa em Coca-Cola® 2×/dia por 20 minutos, durante 14 dias. Os dados foram submetidos aos testes Mann-Whitney e Kruskal-Wallis (p≤0,05). Resultado: A ΔR não foi significante entre os grupos: em água: QTH = 0,006; LED 1 = 0,019; LED 2 = 0,010 (p=0,33); em refrigerante: QTH = 0,021; LED 1= 0,011; LED 2 = 0,030 (p=0,86). A ΔE não foi significativa entre os fotopolimerizadores: em água: QTH = 1,40; LED 1 = 1,80; LED 2 = 1,60 (p=0,31); em refrigerante: QTH = 2,51; LED 1= 1,91; LED 2 = 2,61 (p=0,41), mas foi significante comparando os meios de imersão (p=0,01), exceto para LED 1 (p=0,54). Conclusão: As unidades fotopolimerizadoras não interferiram na rugosidade superficial e na cor da resina composta nanoparticulada. Os mergulhos diários em refrigerante não alteraram a lisura, mas alteraram a cor de modo visualmente perceptível, mas clinicamente aceitável, conforme os parâmetros da literatura científica.
Palavras-chave
Abstract
Introduction: The excessive consumption of soft drinks seems to change the properties of composites and may be associated with the light curing unit. Objective: To evaluate changes in surface roughness (ΔR) and color (ΔE) of one composite polymerized with different light sources, immersed in distilled water or in Coca-Cola®. Methodology: Sixty samples of nanofilled resin (FiltekMR Z350 XT, 3M) were distributed into following light curing units: a) quartz-tungsten-halogen (QTH) light; b) light emitting diode (LED) with polymer tip (LED 1) and c) LED with optic fiber tip (LED 2). Half of each group (n=10) was kept in water or immersed in Coca-Cola® for 20 minutes 2x/day during 14 days. Data were submitted to the Mann-Whitney and Kruskal-Wallis tests (p≤0.05). Result: The ΔR was not significant among groups: in water: QTH = 0.006; LED 1 = 0.019; LED 2 = 0.010 (p=0.33); in soft drink: QTH = 0.021; LED 1= 0.011; LED 2 = 0.030 (p=0.86). The ΔE was not significant among light curing units: in water: QTH = 1.40; LED 1 = 1.80; LED 2 = 1.60 (p=0.31); in soft drink: QTH = 2.51; LED 1= 1.91; LED 2 = 2.61 (p=0.41), but was significant compared the immersion media (p=0.01), except for LED 1 (p=0.54). Conclusion: The light curing lights did not interfere with the surface roughness and with color of nanofilled composite. Daily dives in soft drinks did not change smoothness, but the color changed to visually perceptible way, though clinically acceptable, according to the scientific literature parameters.
Keywords
References
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