Effect of short glass fiber/filler particle proportion on flexural and diametral tensile strength of a novel fiber-reinforced composite

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• 作者：Rodrigo Borges Fonseca ; DDS ; Ms ; PhD^a ; ^{rbfonseca.ufg@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Let&iacute ; cia Nunes de Almeida ; DDS^b ; Gustavo Adolfo Martins Mendes ; DDS^b ; Amanda Vessoni Barbosa Kasuya ; DDS ; Ms^b ; Isabella Negro Favarã ; o ; DDS ; Ms^b ; Marcella Silva de Paula ; DDS^b
• 关键词：Glass fiber ; Flexural strength ; Diametral tensile strength ; Fiber-reinforced composite ; Filler particles
• 刊名：Journal of Prosthodontic Research
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：60
• 期：1
• 页码：47-53
• 全文大小：1025 K

文摘

To evaluate the effect of glass fiber/filler particles proportion on flexural strength and diametral tensile strength of an experimental fiber-reinforced composite.

Methods

Four experimental groups (N = 10) were created using an experimental short fiber-reinforced composite, having as a factor under study the glass fiber (F) and filler particle (P) proportion: F22.5/P55 with 22.5 wt% of fiber and 55 wt% of filler particles; F25/P52.5 with 25 wt% of fiber and 52.5 wt% of filler particles; F27.5/P50 with 27.5 wt% of fiber and 50 wt% of filler particles; F30/P47.5 with 30 wt% of fiber and 47.5 wt% of filler particles. The experimental composite was made up by a methacrylate-based resin (50% Bis-GMA and 50% TEGDMA). Specimens were prepared for Flexural Strength (FS) (25 mm × 2 mm × 2 mm) and for Diametral Tensile Strength (DTS) (3 × 6 Ø mm) and tested at 0.5 mm/min in a universal testing machine.

Results

The results (in MPa) showed significance (different superscript letters mean statistical significant difference) for FS (p < 0.009) and DTS (p < 0.001) – FS results: F22.5/P55: 217.24 ± 20.64^B; F25/P52.5: 245.77 ± 26.80^AB; F27.5/P50: 246.88 ± 32.28^AB; F30/P47.5: 259.91 ± 26.01^A. DTS results: F22.5/P55: 21.82 ± 4.42^B; F25/P52.5: 22.00 ± 7.40^B; F27.5/P50: 18.63 ± 4.41^B; F30/P47.5: 31.05 ± 2.97^A. In SEM analysis, areas without fiber reinforcement demonstrated to be more prone to the presence of bubbles and crack development. The group F30/P47.5 showed areas with a great quantity of fibers without empty spaces for crack propagation.

Conclusion

Increasing fiber content results in higher flexural and diametral tensile strength of an experimental composite reinforced with glass fibers.