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O efeito de bebidas estimulantes na microdureza e estabilidade de cor das resinas compostas universais : estudo in-vitro
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Objetivo: Avaliar a microdureza e estabilidade de cor de diferentes resinas compostas universais: ONEshade Pro, Filtek™ EasyMatch e FiltekTM Z250, após imersões diárias em bebidas estimulantes (café, chá preto, Coca-Cola® e Red Bull®), durante 14 dias.
Materiais e Métodos: Foram confecionadas 75 amostras, em forma de discos com (10 mm × 2 mm) a partir de três resinas compostas: ONEshade Pro (OliDent, Poznan, Polónia), Filtek™ Easy Match (3M ESPE, EUA) e Filtek™ Z250 (3M ESPE, MN, EUA), 25 discos por grupo. As amostras de cada resina foram divididas e identificadas em cinco grupos (n=5), de acordo com o meio de imersão: água destilada (grupo controlo), café, chá, Coca-Cola® e Red Bull®. Após armazenamento inicial em água a 37°C por 24h, foram realizadas medições iniciais de cor (T0) com um espetrofotómetro (Spectroshade™) e da microdureza através de um microdurómetro Vickers. Em seguida, os discos foram submetidos ao protocolo de imersão em bebidas estimulantes durante 14 dias (5 min, duas vezes/dia), com armazenamento em água destilada entre imersões e avaliadas no final do tempo de imersão (T14). Os dados obtidos foram submetidos a análise estatística (SPSS, p<0,05).
Resultados: A resina FiltekTM Z250 foi a mais afetada pelas diferentes bebidas no que diz respeito à microdureza. A Coca-Cola® foi a bebida que causou as maiores reduções de microdureza (p < 0,05). Não se verificaram diferenças estatisticamente significativas entre as resinas quanto à variação de cor, mas o chá foi a bebida que provocou maior pigmentação, seguida do café, com alterações clinicamente inaceitáveis (ΔE > 3,3) (p <0,05).
Conclusões: As bebidas estimulantes afetaram negativamente a microdureza e a estabilidade cromática das resinas testadas. A FiltekTM Z250 foi a mais suscetível à perda de microdureza, sobretudo com a Coca-Cola®, enquanto o chá e o café provocaram as maiores alterações de cor. Pode concluir-se que a composição das resinas e as características químicas das bebidas influenciam diretamente o seu desempenho clínico.
Objective: To evaluate the microhardness and colour stability of different universal composite resins: ONEshade Pro, Filtek™ EasyMatch and FiltekTM Z250, after daily immersion in soft drinks, coffee, black tea, Coca-Cola® and Red Bull® for 14 days. Materials and Methods: Seventy-five samples were prepared as discs (10 mm × 2 mm) from three composite resins: ONEshade Pro (OliDent, Poznan, Poland), Filtek™ Easy Match (3M ESPE, USA) and Filtek™ Z250 (3M ESPE, MN, USA), 25 discs per resin. The samples of each resin were divided and identified into five groups (n=5), according to the immersion medium: distilled water (control group), coffee, tea, Coca-Cola® and Red Bull®. After initial storage in water at 37°C for 24 hours, initial colour measurements (T0) were performed with a spectrophotometer (Spectroshade™) and microhardness measurements were performed with a Vickers microhardness tester. The discs were then subjected to the immersion protocol in stimulating beverages for 14 days (5 min, twice/day), with storage in distilled water between immersions. The data was subjected to statistical analysis (SPSS, p<0.05). Results: The Filtek™ Z250 resin was the most affected by the different beverages in terms of microhardness. Coca-Cola caused the greatest reductions in microhardness (p < 0.05). No statistically significant differences were observed between the resins regarding color variation, but tea caused the highest pigmentation, followed by coffee, with clinically unacceptable changes (ΔE > 3.3) (p < 0.05). Conclusions: The stimulating beverages negatively affected the microhardness and color stability of the tested resins. Filtek™ Z250 was the most susceptible to microhardness loss, especially with Coca-Cola®, while tea and coffee caused the greatest color changes. It can be concluded that the composition of the resins and the chemical characteristics of the beverages directly influence their clinical performance.
Objective: To evaluate the microhardness and colour stability of different universal composite resins: ONEshade Pro, Filtek™ EasyMatch and FiltekTM Z250, after daily immersion in soft drinks, coffee, black tea, Coca-Cola® and Red Bull® for 14 days. Materials and Methods: Seventy-five samples were prepared as discs (10 mm × 2 mm) from three composite resins: ONEshade Pro (OliDent, Poznan, Poland), Filtek™ Easy Match (3M ESPE, USA) and Filtek™ Z250 (3M ESPE, MN, USA), 25 discs per resin. The samples of each resin were divided and identified into five groups (n=5), according to the immersion medium: distilled water (control group), coffee, tea, Coca-Cola® and Red Bull®. After initial storage in water at 37°C for 24 hours, initial colour measurements (T0) were performed with a spectrophotometer (Spectroshade™) and microhardness measurements were performed with a Vickers microhardness tester. The discs were then subjected to the immersion protocol in stimulating beverages for 14 days (5 min, twice/day), with storage in distilled water between immersions. The data was subjected to statistical analysis (SPSS, p<0.05). Results: The Filtek™ Z250 resin was the most affected by the different beverages in terms of microhardness. Coca-Cola caused the greatest reductions in microhardness (p < 0.05). No statistically significant differences were observed between the resins regarding color variation, but tea caused the highest pigmentation, followed by coffee, with clinically unacceptable changes (ΔE > 3.3) (p < 0.05). Conclusions: The stimulating beverages negatively affected the microhardness and color stability of the tested resins. Filtek™ Z250 was the most susceptible to microhardness loss, especially with Coca-Cola®, while tea and coffee caused the greatest color changes. It can be concluded that the composition of the resins and the chemical characteristics of the beverages directly influence their clinical performance.
Descrição
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Palavras-chave
Microdureza Estabilidade de cor Resinas compostas universais Bebidas estimulantes