Influence of Glass Fiber wt% and Silanization on Mechanical Flexural Strength of Reinforced Acrylics

Rodrigo B. Fonseca, Isabella N. Favarão, Amanda V. B. Kasuya, Marcel Abrão, Nícolas F. M. da Luz, Lucas Z. Naves

Dental School, Federal University of Goiás, Goiania, Brazil.
Dental School, Pontifical Catholic University of Minas Gerais, Belo Horizonte, Brazil.
Dental School, State University of Londrina, Londrina, Brazil.
Department of Dental Materials, Piracicaba Dental School, State University of Campinas, Piracicaba, Brazil.
Department of Operative Dentistry and Dental Materials, Dental School, Federal University of Goiás, Goiania, Brazil.

DOI: 10.4236/msce.2014.22003                

Abstract

The aim is to evaluate the flexural strength of acrylic resin bars depending on the addiction of glass fibers with or without previous 3-methacryloxypropyl-trimethoxysilane (silane) application. Short fibers (3 mm) were treated and added to an acrylic resin powder, being further mixed with acrylic liquid to create bars (25 × 2 × 2 mm) of 11 experimental groups (N = 10), according to the interaction of experimental factors: weight % of glass fibers: (0.5; 1; 3; 4; 6 and 7) and silane application (with silane (S) or without silane (N)). Flexural strength and scanning microscopy evaluation were performed (SEM). Data (MPa) were submitted to ANOVA and Tukey (α = 5%). A significant difference between groups was observed (p = 0.001): S7%(128.85 ± 35.76)a, S6% (119.31 ± 11.97)ab, S4% (116.98 ± 25.23)ab, N4% (107.85 ± 24.88)abc, S1% (96.29 ± 20.65)bc, S0.5% (89.29 ± 7.33)cd, S3% (89.0 ± 11.27)cd, N3% (86.79 ± 17.63)cd, N1% (85.43 ± 16.44)cd, Control (73.29 ± 25.0)de, N0.5% (59.58 ± 19.46)e. For N groups, it was not possible to include more than 4%wt fibers. SEM showed better fiber-resin interaction for S groups, and fractures around fibers on N groups. Previous silane application enables the addiction of greater quantity of glass fibers and better interaction with the acrylic resin resulting in higher flexural strength. Without silane, fibers seem to act as initial crack points due to poor interaction.

Keywords

Glass Fibers; Silane; Flexural Strength; Acrylic Resin; Reinforcement

Conflicts of Interest

The authors declare no conflicts of interest.

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