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Formulação resinas compostas experimentais com partículas funcionais e estudo das suas propriedades físico-químicas
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Objetivos: Comparar as propriedades físicas de resinas compostas experimentais com diferentes concentrações de prata coloidal, nomeadamente a microdureza de Vickers e a sorção e solubilidade em água em diferentes momentos temporais.
Métodos: Este trabalho consistiu na formulação e teste de quatro resinas compostas experimentais, com uma matriz orgânica convencional de uretano dimetacrilato e trietileno glicol dimetacrilato, adição de 2-hidroxietilmetacrilato. A fase particulada microhíbrida continha vidros de bário aluminossilicatos em diferentes tamanhos e nanopartículas de sílica. À fase orgânica foi adicionada prata coloidal, variando a concentração em peso (0%; 0,5%; 1%; 2,5%). Foram confecionados discos de resina composta (n=5, para cada experiência). Os testes de sorção/solubilidade e dureza foram realizados nos discos polimerizados. Os discos foram identificados e desidratados e após cada momento temporal (1 h, 12 h, 24 h, 1 semana, 1 mês), foram pesados com uma balança analítica. As mesmas amostras, nos mesmos momentos temporais, foram
submetidas ao teste de microdureza Vickers (Shimadzu HMV; Shimadzu Corporation, Tóquio, Japão), onde foram realizadas 5 indentações para cada amostra. A estatística compreendeu ANOVA fatorial de medições repetidas.
Resultados: A incorporação de diferentes concentrações de prata coloidal nas resinas compostas experimentais não teve um impacto significativo na microdureza Vickers (ANOVA medições repetidas, p<0,05). No entanto, foi observada uma diminuição da microdureza após a imersão em água, independentemente da concentração de prata coloidal. No que diz respeito à sorção, a concentração de prata coloidal não teve um efeito significativo sobre a variável, mas afetou sim a solubilidade em água, com diferenças
observadas entre o grupo de 2,5% e o controlo (Bonferroni, p<0,05).
Conclusão: A incorporação de prata coloidal nas resinas compostas experimentais não teve qualquer impacto na microdureza Vickers e na sorção de água, com exceção da solubilidade a uma concentração de 2,5%.
Objectives: Compare the physical properties of experimental composite resins with different concentrations of colloidal silver, namely Vickers microhardness and water sorption and solubility at different time points. Methods: This work consisted of formulating and testing four experimental composite resins, with a conventional organic matrix of urethane dimethacrylate and triethylene glycol dimethacrylate, plus 2-hydroxyethyl methacrylate. The microhybrid particulate phase contained barium aluminosilicate glass in different sizes and silica nanoparticles. Colloidal silver was added to the organic phase, varying the concentration by weight (0%; 0.5%; 1%; 2.5%). Composite resin disks were made (n=5 for each experiment). Sorption/solubility and hardness tests were carried out on the polymerized discs. The disks were identified and dehydrated and after each time point (1 h, 12 h, 24 h, 1 week, 1 month), they were weighed using an analytical balance Mettler Toledo XS. The same samples, at the same time points, were subjected to the Vickers microhardness test (Shimadzu HMV; Shimadzu Corporation, Tokyo, Japan), where 5 indentations were made for each sample. The statistics comprised repeated-measures factorial ANOVA. Results: Incorporating different concentrations of colloidal silver into the experimental composite resins had no significant impact on Vickers microhardness (repeated-measures ANOVA, p<0.05). However, a decrease in microhardness was observed after immersion in water, regardless of the concentration of colloidal silver. With regard to sorption, the concentration of colloidal silver had no significant effect on the variable, but it did affect water solubility, with differences observed between the 2.5% group and the control (Bonferroni, p<0.05). Conclusion: The incorporation of colloidal silver into the experimental composite resins had no impact on Vickers microhardness and water sorption, with the exception of solubility at a concentration of 2.5%.
Objectives: Compare the physical properties of experimental composite resins with different concentrations of colloidal silver, namely Vickers microhardness and water sorption and solubility at different time points. Methods: This work consisted of formulating and testing four experimental composite resins, with a conventional organic matrix of urethane dimethacrylate and triethylene glycol dimethacrylate, plus 2-hydroxyethyl methacrylate. The microhybrid particulate phase contained barium aluminosilicate glass in different sizes and silica nanoparticles. Colloidal silver was added to the organic phase, varying the concentration by weight (0%; 0.5%; 1%; 2.5%). Composite resin disks were made (n=5 for each experiment). Sorption/solubility and hardness tests were carried out on the polymerized discs. The disks were identified and dehydrated and after each time point (1 h, 12 h, 24 h, 1 week, 1 month), they were weighed using an analytical balance Mettler Toledo XS. The same samples, at the same time points, were subjected to the Vickers microhardness test (Shimadzu HMV; Shimadzu Corporation, Tokyo, Japan), where 5 indentations were made for each sample. The statistics comprised repeated-measures factorial ANOVA. Results: Incorporating different concentrations of colloidal silver into the experimental composite resins had no significant impact on Vickers microhardness (repeated-measures ANOVA, p<0.05). However, a decrease in microhardness was observed after immersion in water, regardless of the concentration of colloidal silver. With regard to sorption, the concentration of colloidal silver had no significant effect on the variable, but it did affect water solubility, with differences observed between the 2.5% group and the control (Bonferroni, p<0.05). Conclusion: The incorporation of colloidal silver into the experimental composite resins had no impact on Vickers microhardness and water sorption, with the exception of solubility at a concentration of 2.5%.
Descrição
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Palavras-chave
Monómero funcional Prata coloidal Resina composta Sorção e Solubilidade Microdureza de Vickers