Context: Neoendo Flex and Mani Silk are recently launched nickel–titanium (NiTi) rotary files. Dentinal cracks and file separation remain a critical problem in the endodontic domain. Aim: The aim was to evaluate and compare the incidence of dentinal crack formation after root canal preparation with Neoendo flex and Mani silk files. Materials and Methods: Thirty-six extracted single-rooted premolars with straight, single root canals were selected for the study. The specimens were randomly assigned to three groups, with 12 samples in each group. The root canal preparation for the three groups was done with hand K-file, Mani Silk, and Neoendo Flex files, respectively, following which the specimens were horizontally sectioned at 3, 6, and 9 mm from the apex. Sectioned samples were viewed under a stereomicroscope to determine the presence or absence of dentinal cracks. The data were analyzed using one-way ANOVA and Chi-square test. Results: Hand K-files and Mani Silk files produced a lesser number of cracks than Neoendo Flex files; however, the difference was not statistically significant among the three file groups at 3 mm and 6 mm ( P > 0.05). A statistically significant difference between the groups was seen at 9 mm, where Mani Silk files produced fewer cracks than K files and Neoendo Flex files ( P = 0.007). Overall, Neoendo Flex significantly produced more cracks than Mani Silk and hand K-files ( P = 0.0029). Conclusions: Both hand K files and NiTi rotary instruments may cause dentinal cracks. Neoendo Flex files tend to produce more dentinal cracks than Mani silk and K-file.
Context: This study has been conducted to study the effect of wifi radiations on amalgam restorations. Aims: To evaluate the release of mercury from class V cavities in presence of Wi-Fi radiations. Methods and Material: 20 extracted human molars were taken and standard cavity of class V was prepared. The 20 sample teeth were then put in two different groups .10 teeth were put into a control group which was kept in an environment devoid of Wi-fi radiation. The remaining 10 teeth were kept in an environment with exposure of Wi-Fi radiation for time period of 25 mins at 2.4 GHz radiation. The mercury concentration found in the artificial saliva in both the groups was measured by using an Inductively Coupled Plasma Optical Emission Spectrometry ICPOES. Statistical analysis used: Statistic evaluation was done using independent t test. Results: The mercury release found in artificial saliva which was in experimental group of WiFi exposure had mean concentration of 0.046mg/L, while for control group the mean concentration recorded was only 0.022 mg/L. statistically significant difference was recorded (P =0.009). Conclusions: With presence of wi-fi radiations all around us the effect of this artificial radiation on amalgam needs to be studied and analysed carefully considering the number of amalgam fillings in patients mouth.
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