Effect of Silanized Alumina Nanoparticles on Compressive Strength and Color Alteration of Heat-polymerized Acrylic Resin Toot
Objectives: To investigate the effects of non-surface treatments and surface treatments with a silane coupling agent for alumina nanoparticles on the compressive strength and color alteration of heat-polymerized acrylic resin tooth.
Methods: A total of 84 heat-polymerized acrylic resin cylinders and 168 heat-polymerized acrylic resin blocks were prepared. The length and diameter of the cylinders (ivory acrylic) for the compressive strength tests were 9 mm and 6 mm, respectively. The length, width and thickness of the blocks for the color alteration tests (clear and ivory acrylic) were 10x10x2 mm, respectively. In each test, specimens were divided into seven groups (n=12). The specimens in the experimental groups were acrylic resin reinforced with alumina nanoparticles at loadings of 1, 3 and 5 wt%, with and without a silane coupling agent; those in the control group were not reinforced nor loaded with alumina nanoparticles. Compressive strength tests were performed using a universal testing machine, and color alterations were investigated using a spectrophotometer. Data were analyzed by twoway ANOVA and the Tukey HSD’s test with a significance level of 0.05.
Results: There were significant differences in compressive strength between the control and the experimental groups. Among all groups, the 1 wt% group treated with silane coupling agent had the highest compressive strength of 294.41±20.24 MPa, and the 5 wt% group without a use of silane coupling agent had the lowest compressive strength of 227.67±15.20 MPa. The lowest color alteration was found in the 1 wt% (clear acrylic) and 5 wt% (ivory acrylic) alumina nanoparticle groups treated with silane coupling agent.
Conclusions: Compressive strength of heat-polymerized acrylic resin were optimally increased by adding silanized alumina nanoparticles at 1 wt%. However, the degree of color alteration was changed, but still acceptable for clinical use.
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