Objectives:The aim of the present study was to evaluate the sealing ability of experimental nano sealers (nano calcium hydroxide and nano bioactive glass) and to compare it with the commercial AH plus sealer using a dye penetration method. Materials and methods:Sixty single-rooted mandibular premolars were selected. The coronal portion of each tooth was removed to standardize root length at 16 mm and the root canals were prepared with NiTi rotary files (ProTaper Next) up to X4 (40/0.06). Teeth were randomly assigned and divided according to the sealer used for obturation into three groups of 20 each. Group I: AH plus, Group 2: Nano calcium hydroxide and Group 3: Nano-bioactive glass. All root canals were obturated using single cone gutta-percha(#40/.06) and one of the tested sealers. Root canal sealing was assessed by a dye penetration test. The data were statistically analyzed by ANOVA test followed by post hoc analysis (P < 0.05).Results: Significant improvement shown by the presented study suggests that nano calcium hydroxide sealer showed significantly less dye leakage than nano bioactive glass sealers and Ah plus sealer. Conclusion:The results of this study showed that the synthesized nano-powder sealers are suitable for use in root canal therapy to prevent leakage. The root canal can be sealed better by using smaller nano-powder particle sizes. In addition, the two groups exhibited significant differences in leakage in comparison with commonly used AH plus sealer.
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.
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.
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