ABSTRACT:
Objective: The aim of this study was to evaluate the effect of two concentrations of chitosan nanoparticles on the mechanical properties of heat polymerized acrylic resin before and after thermocycling. The tested parameters were flexural strength and hardness.
Material and Methods:
120 specimens were prepared according to the specific dimension for each test (flexural strength and micro hardness) and distributed into
- Before thermocycling (control, chitosan nanoparticles with concentration 0.3% and 0.5%)
- After thermocycling (control, chitosan nanoparticles with concentration 0.3% and 0.5%)
Results: Flexural strength and micro hardness were tested for both groups. The data was collected and statistically analyzed. Flexural strength was non-significantly increased for ratio of 0.3% chitosan nanoparticles in comparison to control before and after thermo cycling and significantly decreased for 0.5% chitosan nanoparticles before thermocycling and non-significant decrease after thermocycling in comparison to control
For hardness showed non-significant decrease for both concentrations and significant decrease for control after thermocycling
Conclusion: adding chitosan nanoparticles to heat cured acrylic resin increased the flexural strength for 0.3% ratio and non-significantly decreased for 0.5, while decreased non-significantly micro hardness for both concentrations.