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Navegando FO - Artigos publicados em periódicos por Assunto "Acrylic resins"
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Item Efeito de diferentes tratamentos de superfície em fibras de resina termoplástica na resistência e módulo flexural de barras de resina acrílica(2013) Fonseca, Rodrigo Borges; Favarão, Isabella Negro; Kasuya, Amanda Vessoni Barbosa; Lourenço, Fernanda Cristina Silva; Souza, João Batista de; Lopes, Lawrence GonzagaObjective: This study evaluated the flexural strenght and flexural modulus of reinforced acrylic resin bars with thermoplastic fibers subjected to different treatments. Material and methods: Five experimental groups were created (N = 10), with the factor under study the type of treatment surface of fibers (control without fiber (Ctrl), pure fiber (PF), silanization (Fsil), pre-impregnated with adhesive (Fimp) , silanization + pre-impregnation (Fsil/imp)). Bars (25x2x2mm) were tested for flexural strength with 3-point bending test, obtaining the values of flexural strength (FS) and flexural modulus (FM). The RF data (MPa) and MF (GPa) were submitted to ANOVA test. Results: The statistical analysis showed similarity between groups (p = 0.298 for FS, p = 0.549 for FM). For FS, it was observed: Ctrl (15614.68 ± 7119.25) A, PF (14903.31 ± 5743.65) A, Fsil (11142.47 ± 5629.92) A, Fimp (9284 ± 16365.10 60) A, Fsil/imp (11882.56 ± 3544.39) A. For FM, observed: Ctrl (3996.30 ± 2025.46) A, FP (3275.14 ± 1841.26) A, Fsil (3491.54 ± 2812.14) A, Fimp (4544.46 ± 3357 18) A, Fsil/imp (2842.16 ± 1193.13) A. Conclusion: It can be concluded that the type of surface treatment of fibers of thermoplastic resin does not provide improvements in RF and MF acrylic resin bars.Item Influência do comprimento e tratamento superficial de fibras de vidro na resistência flexural de barras de resina acrílica(2013) Fonseca, Rodrigo Borges; Kasuya, Amanda Vessoni Barbosa; Favarão, Isabella Negro; Miotto, Janaína Castilho; Lopes, Lawrence GonzagaObjective: This study evaluated the flexural strength of acrylic resin bars by varying the surface treatment and the length of glass fiber. Material and Methods: Nine experimental groups were established (N = 10), with factors in study the length of the pure glass fiber (Unidirectional 23mm (Uni23) and short 3mm (Pic3)) and the type of surface treatment (untreated (Ctrl), silanization (Sil), impregnation with BisGMA adhesive (Imp) and silanization + impregnation with BisGMA adhesive (Imp / Sil)). Samples (25x2x2 mm) were produced and tested at 0.5 mm / min ontaining flexural strength values in MPa. Results: Statistical analysis showed a significant difference (p = 0.001) for the factors: surface treatment (Imp: 297.95 ± 73.86 A; Sil / Imp: 265.3 ± 64.21 AB; Sil: 229.2 ± 72.47 B; control: 164.9 ± 34.92 C) and fiber length (Uni23: 266.5 ± 89.57 a; Pic3: 212.17 ± 57.31 b). The interaction between the two factors in the study showed no statistically significant difference (p = 0.098). Conclusion: Glass fibers, independent of its length, promotes a significant reinforcement of acrylic resins when its surface are treated with bis- -GMA adhesive, silane or a combination of both.