Caracterização química e resistência à flexão de uma resina acrílica após a incorporação de um polímero com atividade antimicrobiana

• Autor(a) principal: Rodriguez, Larissa Santana [UNESP]
• Data de Publicação: 2011
• Outros Autores: Paleari, André Gustavo [UNESP], Oliveira Júnior, Norberto Martins de [UNESP], Marra, Juliê, Pero, Ana Carolina [UNESP], Compagnoni, Marco Antonio [UNESP]
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://www.revodontolunesp.com.br/article/51ae4aa81ef1faca3d003801; http://hdl.handle.net/11449/125752
• topic: Denture; Acrylic resins; Antimicrobial agents; Prótese total; Resinas acrílicas; Agentes antimicrobianos

Introduction: Acrylic resins with antimicrobial activity could offer patients complete denture and partial wearers’ improvement in their oral health by means of a better control of biofilm formation. Objective: The objective of this study was chemically characterize a denture base acrylic resin (Onda-Cryl) that was incorporated the antimicrobial polymer 2-tert-butylaminoethyl (PTBAEMA) and to evaluate the flexural strength of this resin. Material and method: Rectangular specimens were from a denture base acrylic resin with different concentrations of PTBAEMA (0,5 and 10%). Specimens’ surfaces were assessed by ESCA to detect the presence of amine groups, represented by nitrogen ratios. Analysis of FTIR and DSC were used to evaluate the polymerization process and the influence of the incorporation of PTBAEMA in Tg of the resin, respectively. Flexural strength was evaluated and the results were analyzed by ANOVA/Tukey HSD test (α = 0.05). Result: Different nitrogen ratios were observed for groups 0, 5 and 10% (0, 0.85 and 5.82% respectively), there was copolymerization between the resin and PTBAEMA, and reduction of Tg after incorporation of PTBAEMA. Significant differences were found for flexural strength (p < 0.05), the mean values were 94.7 ± 9.4A, 21.8 ± 3.4B, 13.0 ± 1.5C MPa for groups 0,5 and 10%, respectively. Conclusion: The incorporation of PTBAEMA resulted in copolymerization, presence of amine groups on specimens’ surfaces, and in decrease of Tg and flexural strength.