ABSTRACT

Aim: This study was performed to examine the anti-microbial effect of different percentages of titanium dioxide and chitosan nanoparticles to heat cured poly methyl meth acrylate.

Subjects and methods: 120 specimens of heat cure acrylic resin were grouped according to nano additives concentrations for testing anti-microbial effect.

Results: the addition of chitosan nano particles to PMMA in 0.3% and 0.5% decreased the microbial biofilm formation in comparison to the control (PMMA without chitosan). the addition of Tio2 nano particles in concentrations 1% and 2% decreased the microbial biofilm formation more than the chitosan nano particles concentrations 0.3 and 0.5.

Conclusion: The addition of chitosan nano particles to PMMA in 0.3% and 0.5% decreased the microbial biofilm formation in comparison to the control (PMMA without chitosan). the addition of Tio2 nano particles in concentrations 1% and 2% decreased the microbial biofilm formation more than the chitosan nano particles. The higher concentrations of the chitosan and Tio2 nano particles resulted in stronger antimicrobial effect.

ABSTRACT

Aim: This study was performed to examine the anti-microbial effect of different percentages of titanium dioxide and chitosan nanoparticles to heat cured poly methyl meth acrylate.

Subjects and methods: 120 specimens of heat cure acrylic resin were grouped according to nano additives concentrations for testing anti-microbial effect.

Results: the addition of chitosan nano particles to PMMA in 0.3% and 0.5% decreased the microbial biofilm formation in comparison to the control (PMMA without chitosan). the addition of Tio2 nano particles in concentrations 1% and 2% decreased the microbial biofilm formation more than the chitosan nano particles concentrations 0.3 and 0.5.

Conclusion: The addition of chitosan nano particles to PMMA in 0.3% and 0.5% decreased the microbial biofilm formation in comparison to the control (PMMA without chitosan). the addition of Tio2 nano particles in concentrations 1% and 2% decreased the microbial biofilm formation more than the chitosan nano particles. The higher concentrations of the chitosan and Tio2 nano particles resulted in stronger antimicrobial effect.

Objective:

The aim of this study was to evaluate the effect of different concentrations of titanium dioxide 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, (TiO2) nanoparticles with concentration (0.1% and 0.2%). - After thermocycling (control, (TiO2) nanoparticles with concentration (0.1% and 0.2%). Thermal cycles were performed in a thermocycling machine consisted of 5000 cycles at 5°C and 55°C. Results: Flexural strength and micro hardness were tested for both groups. The data was collected and statistically analyzed. Both Flexural strength and micro hardness were decreased by adding TiO2 nano particles concentrations.

Conclusion: adding (TiO2) nanoparticles to methyl methacrylate adversely affects the flexural strength and micro hardness before and after thermocycling.

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.

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.