Effect of Different Alumina Filler Amounts Reinforced into Acrylic Denture Base on Tensile Bond Strength between Denture Teeth and Denture Base
Objectives: The purpose of this study was to investigate the effect of different alumina filler amounts reinforced into acrylic denture base on tensile bond strength between denture teeth and denture base.
Methods: Alumina filler, spherical-shaped with 18-23 µm in diameter (surface area of with 18-23 µm in diameter (surface area of 0.36 m2 /g), was silanized with 0.1 wt% of gammamethacryloxypropyltrime thoxysilane (MPS). The 5, 10 and 15 wt% of silanized alumina filler were mixed with heat-polymerized PMMA. Heat polymerized PMMA without reinforced alumina was served as control. All of 4 groups were packed with artificial denture teeth and prepared into dumbbell-shaped specimens (n=10). The speci-mens were immersed in distilled water at 37°C for 24 h prior to testing. The tensile bond strength test was performed using a universal testing machine (Instron 8872, Fareham, UK) with a 1mm/min crosshead speed until fracture. The bond strength was determined and analyzed by 1way-ANOVA and Tamhane’s test with a significance level of 0.05.
Results: The EDS analysis showed the deposition of silicon element on the surface of alumina filler. The mean tensile bond strengths (SD) in MPa of control, 5, 10 and15 wt% groups were 25.4 (3.1), 26.5 (4.6), 22.8 (3.8) and 18.4 (3.3), respectively. From statistical analysis, the tensile bond strengths of all groups except in 15 wt% were not signi-ficantly different, while, in 15 wt% group was significantly small among each other. The failure mode of all of the specimens was adhesive failure.
Conclusions: Within the limitations of this study, it can be concluded that addition of silanized alumina filler reinforced into PMMA denture base less than 10 wt% do not change tensile bond strength between PMMA denture base and denture teeth.
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