Effect of Silanized Nano-Silica on Flexural Properties and Color Stability of Polymethyl Methacrylate
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Abstract
Objective: To investigate the effect of silanized nano-silica on flexural properties and color stability of polymethyl methacrylate (PMMA)
Materials and methods: Flexural properties were tested by 3-point bending on silanized nano-silica-reinforced PMMA bar (10±0.2 X 64±0.01 X 3.3±0.2 millimeters). There were 4 groups of nano-silica containing at 0, 1, 3 and 5 percentages by weight (wt %) of PMMA (n=10 for each group). Color differences of clear and tooth-colored PMMA specimens (11 ±0.2 X11 ±0.2 X2 ±0.2 millimeters) with silanized nano-silica contents at 0, 1, 3 and 5 wt% (8 groups, n=10 for each group) were measured using Spectrophotometer and then calculated into NBS units (National Bureau of Standard) to indicate color stability.
Results: The statistically significant highest flexural strength was the group with silanized nano-silica at 1 wt%, and the statistically significant highest flexural modulus was the group with silanized nano-silica at 5wt%. The groups with silanized nano-siliica at 1 and 3 wt% of tooth-colored PMMA had color stability.
Conclusions: This study showed that reinforcement of PMMA with 1 wt% silanized nano-silica significantly improved the flexural properties. Tooth-colored PMMA had color stability when reinforced with 1 and 3 wt% silanized nano-silica.
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