Abstract
Aims: To determine the influence of titanium oxide nanoparticles at two different concentrations (0.5% and 1.0%) on, the thermal conductivity of heat-cured denture base resin. Materials and Methods: The specimens, were constructed from PMMA with TiO2 nanoparticles with different concentrations (0.5 and 1%). The specimens were produced using "heat-cured PMMA" and TiO2 nanoparticles, the resulting nanocomposite will depend on the dispersion of the nanoparticles within the matrix, which is directly related to the added amount. The required percentages were weighed and thoroughly mixed with acrylic powder. TiO2 nanoparticles were mixed with the acrylic powder for up to 20 min in an amalgamator to obtain a homogenous mix. Also mortar, and pestle, were used, to attain a uniform mixture and homogenous distribution of TiO2 nanoparticles. The mixture is then combined with the PMMA monomer and stirred before being packed with curing to produce the final specimen, which had been stored in an incubator for two days before testing. Lee’s Disc method is used for thermal conductivity tests by apparatus (Griffin and George/England). The specimen for this test was prepared in a cylinder –shape with a thickness of about 3 mm and a diameter is about 40 mm. Results: According to the study's findings, there was a statistically significant difference between the groups in terms of thermal conductivity. Conclusions: According to the experimental results of PMMA denture base materials, prepared in this research can be concluded the following sentences: The addition of TiO2 nanoparticles has a remarkable effect on the thermal conductivity of PMMA denture base material with a small concentration of TiO2 nanoparticles. The thermal conductivity of PMMA was increased with the decreasing volume fraction of TiO2 nanoparticles.
