Effect of glass fiber incorporation on flexural properties of experimental composites.

Rodrigo Borges Fonseca,Lucas Zago Naves,Aline Silva Marques,Karina De Oliveira Bernades,Hugo Lemes Carlo

doi:10.1155/2014/542678

Abstract

This study evaluated the effect of fiber addiction in flexural properties of 30 wt% silica filled BisGMA resin (FR) or unfilled Bis-GMA (UR). Ten groups were created (N = 10) varying the resin (FR or UR) and quantity of glass fibers (wt%: 0, 10, 15, 20, and 30). Samples (10 × 2 × 1 mm) were submitted to flexural strength test following SEM examination. Data were analyzed by two-way ANOVA, Tukey, and Student t-test (α = 0.05). Results for flexural strength (MPa) were FR-groups: 0% (442.7 ± 140.6)C, 10% (772.8 ± 446.3)ABC, 15% (854.7 ± 297.3)AB, 20% (863.4 ± 418.0)A, 30% (459.5 ± 140.5)BC; UR-groups: 0% (187.7 ± 120.3)B, 10% (795.4 ± 688.1)B, 15% (1999.9 ± 1258.6)A, 20% (1911.5 ± 596.8)A, and 30% (2090.6 ± 656.7)A, and for flexural modulus (GPa) FR-groups: 0% (2065.63 ± 882.15)B, 10% (4479.06 ± 3019.82)AB, 15% (5694.89 ± 2790.3)A, 20% (6042.11 ± 3392.13)A, and 30% (2495.67 ± 1345.86)B; UR-groups: 0% (1090.08 ± 708.81)C, 10% (7032.13 ± 7864.53)BC, 15% (19331.57 ± 16759.12)AB, 20% (15726.03 ± 8035.09)AB, and 30% (29364.37 ± 13928.96)A. Fiber addiction in BisGMA resin increases flexural properties, and the interaction between resin and fibers seems better in the absence of inorganic fillers increasing flexural properties.

Highlights

For over than 30 years fibers have been used as structural reinforcement for dental resins [1], including carbon, polyethylene, aramid, and glass fibers
This study evaluated the effect of fiber addiction in flexural properties of 30 wt% silica filled BisGMA resin (FR) or unfilled BisGMA (UR)
Resins were used as provided by manufacturer and the groups were created by manual incorporation of 3 mm short glass fibers into resins

Summary

Introduction

For over than 30 years fibers have been used as structural reinforcement for dental resins [1], including carbon, polyethylene, aramid, and glass fibers. Glass fibers display high tensile strength and aesthetic appearance and have been widely studied in terms of strengthening effect [3,4,5,6] and interaction with composite or acrylic resins [5, 7, 8] in order to manufacture root posts [9, 10]. The effectiveness of fiber reinforcement depends on many factors, including the resin material, the quantity, length, shape, orientation, and adhesion properties of fibers [11]. Studies have shown the relationship between the amount of fibers in polymer matrix and the flexural strength of tested reinforced materials [15,16,17]. The use of 22.5 wt% 3 mm short glass fiber in 22.5 wt% photopolymerizable methacrylate resins (Bis-GMA, TEGDMA, and polymethylmethacrylate) and 55 wt% inorganic fillers resulted in high fracture strength for severely damaged postrestored incisors [18]

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