Effect of adding Tio2 nanoparticles on the properties of poly methyl methacrylate before and after thermocycling

Document Type : Original Article

Authors

1 Lecturer of Prosthodontics, Faculty of Dentistry, Assiut University

2 Lecturer of Dental Materials, Faculty of Dentistry, Assiut University

Abstract

ABSTRACT:
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

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Egyptian Dental Journal
Volume 69, Issue 1 - Serial Number 4
January (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)
January 2023
Pages 675-681

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