ABSTRACT
Background: This study aimed to compare the effect of heat treatment on the cyclic fatigue resistance of three different nickel-titanium rotary file systems: TruNatomy, HyFlex CM, and NeoEndo flex in simulated curved canals at two different radii of curvatures. Materials and Methods: A total of 60 NiTi rotary files of three types were used, and the samples were divided into three groups TruNatomy, HyFlex CM, and NeoEndo flex. All the instruments were subjected to cyclic fatigue testing using a stainless steel custom-made canal model with a 60° angle of curvature and two radii of curvature 5 mm and 3 mm; the number of cycles to fracture and length of the fractured segment was measured. The separated instruments were subjected to fractographic analysis under scanning electron microscope. Results: The number of cycles to failure to fracture a file at a 3 mm radius of curvature is significantly less as compared to a 5 mm radius of curvature (HCM > TRN > NE). Conclusion: Within the limitation of the present study, there was a positive correlation between the radius of curvature and fatigue life of NiTi files.
ABSTRACT
BACKGROUND: The role of spirituality in people's lives, particularly the lives of health professionals, as well as its impact on mental health issues like anger and aggressiveness and resilience, are particularly significant. Therefore, the purpose of this study was to examine the link between the propensity for violence and personal resilience in dental students by taking into account the function of spirituality as a mediator. MATERIALS AND METHODS: In this cross-sectional questionnaire survey, 211 volunteer dentistry students participated from a government institute in Jammu and Kashmir, India using a stratified sample procedure. The Spiritual Orientation Scale, Buss and Perry Aggression Questionnaire, and Connor-Davidson Resilience Scale were used to gather the data. SPSS version 20.0 was used for conducting a bivariate analysis to ascertain the directionality connection between the research variables. In addition; structural equation modelling analysis was conducted by Smart PLS. RESULTS: According to the findings, resilience and spirituality have a substantial and positive link (r = 0.468 r = 0.023). Aggressiveness and resilience revealed a statistically significant inverse link (r = 0.325, P = 0.04), but aggression and spirituality had no significant correlation. Spirituality played a substantial mediation influence in the indirect pathway of violence on resilience (P = 0.001). CONCLUSION: According to the study's findings, spirituality can help pupils become more resilient as individuals and can act as a helpful intermediary between aggressiveness and resilience.
ABSTRACT
AIM: This study was conducted to evaluate the microleakage of class V cavities restored with composite resin and different adhesive systems. MATERIALS AND METHODS: In this experimental epidemiological investigation, a total of 75 freshly extracted human teeth were collected. The teeth were randomly divided into three groups (n = 25). Three different intermediate adhesive materials (Clearfil SE Bond, Single Bond, and Xeno III) were used for each group. RESULTS: On testing without the application of occlusal load, the maximum microleakage was seen for group III (Xeno III) followed by group I (Clearfil SE) and then group II (Single Bond). On application of occlusal load, the maximum micro-leakage was seen for group III (Xeno III) followed by group II (Single Bond) and then group I (Clearfil SE Bond). The data were analyzed statistically using Kruskal-Wallis and Mann-Whitney U test. CONCLUSION: Group III showed the maximum amount of micro-leakage both with and without occlusal load. CLINICAL SIGNIFICANCE: All adhesives under investigation exhibited a certain amount of microleakage in enamel and dentin.
