TOC Summary Line: Healthcare workers in hospitals affected by SARS experience increased psychological stress 1–2 years after the outbreak.

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Objective:To evaluate the interference of active cellphones during electronic working length (EWL) determination of a root canal.Materials and Methods:Thirty patients requiring root canal treatment in the anterior teeth or premolars having single canal and mature apices were selected for this study. Working length determination was done using no. 15 K-file. Electronic apex locators ProPex Pixi and Root ZX mini were used for working length determination. Cellphones iPhone 6s and Xolo Q3000 were evaluated for their interference. The experiment was conducted in a closed room (9 feet × 9 feet). Working length was measured with no cellphone in the room, iPhone 6s in a calling mode, Xolo Q3000 in a calling mode, and Xolo Q3000 and iPhone 6s simultaneously in a calling mode. Stability of the readings was also determined for every condition.Statistical Analysis:The data were statistically analyzed using one-way ANOVA and paired t-test at 0.05 level of significance.Results:Results were not statistically significant.Conclusion:Within the limitations of the present study, cellphones do not interfere with the EWL determination.

Background: The current COVID-19 pandemic has become a serious issue for the health-care professionals including dental practitioners. Materials and Methods: A total of 100 subjects were selected for the study. An online questionnaire using Google Forms was used to collect the data regarding the dentist's knowledge, perceptions and infection control in dental clinics and if they were affected by COVID-19. Data were analysed using software. Results: Out of 100 participants, 61% of them were male with a mean age of 35.21 years. More than 50% of practitioners took 10–20 min for completion of their procedure. 66% used all the personal protective equipment (PPE) with 64% of them using an N95 mask and around 90% used the PPE kit. Amongst the study group, it was found that 3% were affected by COVID-19, who were between 27 and 33 years. All of them used PPE kit with 67% using N95 mask and 33% used half respirator. 67% amongst them used high-speed handpiece and performed aerosol-producing procedures in a well-ventilated atmosphere with air conditioners. Conclusion: The findings of the study showed that the maximum number of practitioners did follow the clinical protection protocol and when all protocol was followed, the number of dental practitioners affected by COVID-19 was not statistically significant.

Objectives: The objective of the study is to compare cyclic fatigue resistance of heat-treated rotary nickel titanium TruNatomy and ProTaper Gold with non-heat treated ProTaper Universal on simulated extremely curved root canal. Methodology: Thirty heat treated rotary nickel titanium (NiTi) files were used for analysis in this study. Ten NiTi files were distributed to each group with a size of 25 and taper of 0.04. Group A (control group): ProTaper Universal (PTU), Group B: ProTaper Gold F1(PTG), Group C: TruNatomy (TN). The cyclic fatigue of the NiTi instruments were evaluated using a custom-made experimental setup. NiTi files were tested within simulated 90-degree curvature canal in a metal block until the files were fractured. Number of cycles to failure (NCF) was then measured for each instrument. The one-way ANOVA test and Post hoc Tukey test was performed as statistical analysis to compare the cyclic fatigue of different rotary file. P < 0.001 was considered statistically significant. Result: Group C (TruNatomy) showed the highest mean value which was statistically significant with Group A and Group B with P <0.001. Conclusion: Trunatomy showed the highest NCF & superior cyclic fatigue in simulated 90o curved canal than ProTaper Gold and ProTaper Universal.