IADR Abstract Archives
Mechanical properties of resin-composite reinforced with silanized nano-hydroxyapatite fillers
Objectives: To evaluate physical and mechanical properties of experimental resin-composite with non-silanized and silanized nano-hydroxyapatite fillers.
Methods: Experimental bis-GMA-based resin-composites with nano-hydroxyapatite fillers were prepared. Nano-hydroxyapatites were synthesized by hydrothermal technique and they weresilanized. Five test groups were prepared: 1. unfilled resin (60-wt% bis-GMA and 40-wt% TEGDMA), 2. resin reinforced with 10-wt% and 30-wt% unsilanized nano-hydroxyapatite fillers and 3. Reinforced with 10wt% and 30wt% silanized hydroxyapatite fillers. TPH3 (Dentsply, Konstanz, Germany) was used as control. Samples were prepared in disc-shaped mould (8-mm diameter, 4-mm thickness) and light-cured for 40 s (both sides). Samples were subjected to dry and water storage (37°C, 30-d). Micro-hardness and water sorption were evaluated. Samples were characterized by SEM, EDAX, FTIR and DSC.
Results: One-way ANOVA showed Vickers-microhardness of reinforced resins with silanized nano-hydroxyapatite fillers was higher than unfilled before (p<0.01) and after 30-d water storage (p<0.001). The 30-wt% silanized samples produced the highest Vickers-microhardness before and after 30-d water storage (Table 1). The incorporation of silanized fillers reduced water sorption, which decreased with increased filler loading. The 30-wt% silanized filled resinproduced the lowest water sorption (Table 2). With increase in content of silanized fillers, the thermal behavior of samples was improved.
Conclusions: Physical, thermal and mechanical properties of experimental resin-composites were significantly improved with the increase of filler loading and silanization of filler particles.
Methods: Experimental bis-GMA-based resin-composites with nano-hydroxyapatite fillers were prepared. Nano-hydroxyapatites were synthesized by hydrothermal technique and they weresilanized. Five test groups were prepared: 1. unfilled resin (60-wt% bis-GMA and 40-wt% TEGDMA), 2. resin reinforced with 10-wt% and 30-wt% unsilanized nano-hydroxyapatite fillers and 3. Reinforced with 10wt% and 30wt% silanized hydroxyapatite fillers. TPH3 (Dentsply, Konstanz, Germany) was used as control. Samples were prepared in disc-shaped mould (8-mm diameter, 4-mm thickness) and light-cured for 40 s (both sides). Samples were subjected to dry and water storage (37°C, 30-d). Micro-hardness and water sorption were evaluated. Samples were characterized by SEM, EDAX, FTIR and DSC.
Results: One-way ANOVA showed Vickers-microhardness of reinforced resins with silanized nano-hydroxyapatite fillers was higher than unfilled before (p<0.01) and after 30-d water storage (p<0.001). The 30-wt% silanized samples produced the highest Vickers-microhardness before and after 30-d water storage (Table 1). The incorporation of silanized fillers reduced water sorption, which decreased with increased filler loading. The 30-wt% silanized filled resinproduced the lowest water sorption (Table 2). With increase in content of silanized fillers, the thermal behavior of samples was improved.
Conclusions: Physical, thermal and mechanical properties of experimental resin-composites were significantly improved with the increase of filler loading and silanization of filler particles.