The Study of Tensile Bond Strength between Modified Methacrylate Denture Base and various Types of Denture Teeth
Objectives: The purpose of this study was to investigate the effect of amounts of alumina filler reinforced into methacrylate denture base on tensile bond strength between various types of denture teeth and denture base.
Methods: Alumina filler, spherical-shaped with 18-23 µm in diameter (surface area of 0.36 m2 /g), was silanized with 0.1 wt% of gamma- methacryloxypropyltrimethoxysilane (MPS). The 5 and 10 wt% of silanized alumina filler were mixed with heat-polymerized polymethylmethacrylate (PMMA). Heat-polymerized PMMA without alumina reinforcement was served as control. Three types of artificial denture teeth [Major dent (MD), Excellence IPN (IPN) and Orthosit (OS)] were packed with heat-polymerized PMMA and prepared into mini dumbbell-shaped specimens (n=10). The specimens 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 1 mm/min crosshead speed until fracture. The bond strength was determined and analyzed by Two-way ANOVA and Tukey HSD’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. From statistical analysis, the interactions between the amounts of alumina filler reinforced into denture base and various types of denture teeth were significant. The tensile bond strengths of all groups except in 10 wt% of OS group were not significantly different, while, in 10 wt% of OS group was significantly smaller than the other groups. 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 denture base less than 10 wt% do not affect tensile bond strength between denture base and denture teeth except in 10 wt% of OS group.
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