2020-02-282020-02-282013FONSECA, Rodrigo B. Fonseca et al. Influência do comprimento e tratamento superficial de fibras de vidro na resistência flexural de barras de resina acrílica. Robrac: revista odontologica do Brasil Central, Goiânia, v. 21, n. 61, p. 76-79, 2013.0104-7914http://repositorio.bc.ufg.br/handle/ri/18765Objective: 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.porAcesso AbertoResistência de materiaisFibras de vidroResinas acrílicasMaterial resistanceAcrylic resinsGlass fibersArtigo