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Estabilidade da cor de resinas compostas universais com bebidas estimulantes antes e após envelhecimento
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Authors
Abstract(s)
Objetivos: O objetivo deste estudo foi avaliar a estabilidade cromática de resinas compostas universais com bebidas estimulantes antes e após o envelhecimento térmico.
Materiais e métodos: Foram preparados 150 discos (50 por resina): Filtek Z250 na cor A2 (3M ESPE, Saint Paul, MN, EUA), Filtek EasyMatch na cor Natural (3M ESPE) e Oneshade PRO (OliDent, Poznań, Polónia). Metade dos discos foi submetida a 10 000 ciclos de envelhecimento térmico. As amostras (n=5) foram imersas em quatro
soluções estimulantes (café, chá, Coca-Cola e Red Bull) e em água destilada (grupo controlo), durante 5 min, duas vezes por dia, durante 14 dias. A cor foi avaliada em dois momentos com o colorímetro Optishade Style Italiano (Smile Line as, St-Imier, Suiça): antes/depois do envelhecimento (T0) e após os 14 dias de imersão (T1). Os dados CIE L*a*b* foram analisados com ANOVA 3 fatores, com um nível de significância de 5 %.
De seguida, este valor foi transformado em unidades NBS (National Bureau of Standards) para indicar a diferença de cor numa perspetiva clínica.
Resultados: Os valores de ΔE* variaram de forma significativa em função do tipo de resina, da bebida e do envelheciemnto (p < 0,001), tendo sido observadas interações significativas entre estes fatores. Entre as resinas, a ONEshade PRO evidenciou as maiores alterações de cor, seguida da Filtek Easy Match e, por último, da Filtek Z250.
Relativamente às bebidas, o café foi a bebida que provocou a maior alteração de cor, seguido do chá, enquanto a Coca-Cola e o Red Bull apresentaram efeitos semelhantes e inferiores. As amostras envelhecidas com termociclagem apresentaram valores de ΔE mais baixos (p < 0,001) quando comparadas com as não envelhecidas. A avaliação em unidades NBS confirma estes resultados, evidenciando que, enquanto a água destilada, a Coca-Cola e o Red Bull originam apenas alterações ligeiras e aceitáveis, o café e o chá induzem modificações clinicamente relevantes, sobretudo nas resinas Filtek Easy Match e ONEshade PRO.
Conclusões: As bebidas estimulantes, como o café, alteram a cor das resinas compostas estudadas, independentemente de terem sido submetidas ou não ao envelhecimento térmico.
Objectives: The objective of this study was to evaluate the color stability of universal composite resins with stimulating beverages before and after thermal aging. Materials and methods: A total of 150 discs (50 per resin) were prepared: Filtek Z250 in shade A2 (3M ESPE, Saint Paul, MN, USA), Filtek EasyMatch in shade Natural (3M ESPE), and Oneshade PRO (OliDent, Poznań, Poland). Half of the discs were subjected to 10,000 cycles of thermal aging. The samples (n=5) were immersed in four stimulating solutions (coffee, tea, Coca-Cola, and Red Bull) and in distilled water (control group), for 5 minutes, twice a day, for 14 days. Color was evaluated at two time points with the Optishade Style Italiano colorimeter (Smile Line as, St-Imier, Switzerland): before/after aging (T0), and after 14 days of immersion (T1). The CIE L*a*b* data were analyzed with 3-factor ANOVA, with a significance level of 5%. Then, this value was transformed into NBS (National Bureau of Standards) units to indicate the color difference from a clinical perspective. Results: ΔE* values varied significantly depending on resin type, beverage, and thermocycling (p < 0.001), with significant interactions among these factors. Among the resins, ONEshade PRO showed the greatest color changes, followed by Filtek Easy Match, and finally Filtek Z250. Regarding beverages, coffee induced the highest color change, followed by tea, while Coca-Cola and Red Bull produced similar and lower effects. Thermocycled samples presented lower ΔE* values (p < 0.001) compared with non-aged ones. The evaluation in NBS units confirmed these results, showing that while distilled water, Coca-Cola, and Red Bull caused only slight and clinically acceptable changes, coffee and tea induced clinically relevant modifications, particularly in Filtek Easy Match and ONEshade PRO. Conclusions: Stimulant beverages, such as coffee, alter the color of the composite resins studied, regardless of whether they have been subjected to thermal aging or not.
Objectives: The objective of this study was to evaluate the color stability of universal composite resins with stimulating beverages before and after thermal aging. Materials and methods: A total of 150 discs (50 per resin) were prepared: Filtek Z250 in shade A2 (3M ESPE, Saint Paul, MN, USA), Filtek EasyMatch in shade Natural (3M ESPE), and Oneshade PRO (OliDent, Poznań, Poland). Half of the discs were subjected to 10,000 cycles of thermal aging. The samples (n=5) were immersed in four stimulating solutions (coffee, tea, Coca-Cola, and Red Bull) and in distilled water (control group), for 5 minutes, twice a day, for 14 days. Color was evaluated at two time points with the Optishade Style Italiano colorimeter (Smile Line as, St-Imier, Switzerland): before/after aging (T0), and after 14 days of immersion (T1). The CIE L*a*b* data were analyzed with 3-factor ANOVA, with a significance level of 5%. Then, this value was transformed into NBS (National Bureau of Standards) units to indicate the color difference from a clinical perspective. Results: ΔE* values varied significantly depending on resin type, beverage, and thermocycling (p < 0.001), with significant interactions among these factors. Among the resins, ONEshade PRO showed the greatest color changes, followed by Filtek Easy Match, and finally Filtek Z250. Regarding beverages, coffee induced the highest color change, followed by tea, while Coca-Cola and Red Bull produced similar and lower effects. Thermocycled samples presented lower ΔE* values (p < 0.001) compared with non-aged ones. The evaluation in NBS units confirmed these results, showing that while distilled water, Coca-Cola, and Red Bull caused only slight and clinically acceptable changes, coffee and tea induced clinically relevant modifications, particularly in Filtek Easy Match and ONEshade PRO. Conclusions: Stimulant beverages, such as coffee, alter the color of the composite resins studied, regardless of whether they have been subjected to thermal aging or not.
Description
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Keywords
Estética Resinas compostas Estabilidade cromática Cor dentária