DC Conductivity Study of Cadmium Sulfide Nanoparticles

The dc conductivity of consolidated nanoparticle of CdS has been studied over the temperature range from 303 K to 523 K and the conductivity has been found to be much larger than that of single crystals

Awareness among Indian dentist regarding the role of physical activity in prevention of work related musculoskeletal disorders

Background: The prevalence of work-related musculoskeletal complaints in dentists is high and the past two decades have witnessed a sharp rise in the incidence of various disorders. The prevalence of musculoskeletal pain ranges between 64% and 93%. The most effected regions have been back and neck. Various studies have been done to record stress levels and health-related behaviors of dentists in other countries but limited data is available among the Indian dentists. Materials and Methods: Therefore a questionnaire survey was carried out among 102 Indian dentists belonging to different fields having at least one musculoskeletal disorder in last 6 months. Results: The total sample consists of 80 males and 22 females. Out of the 102 over 97 of dentists had sought medical advice for these disorders during the previous 06 months and 74 of them also consulted the physiotherapist for exercises and ergonomic advice. The number of sessions taken for regular physical exercises was minimum 6 till 44 the most. The percentage of improvement in symptoms varied between 20% and 80%. Conclusions: A significant direct correlation between the number of sessions taken for physical activity and the self-perceived improvement in the symptoms was found using the Pearson correlation test. The work-related musculoskeletal disorders among dentists not only decrease their efficiency but also is a major concern among them. Self-awareness and benefits of regular exercise is the need of the hour

Thermally stimulated discharge conductivity study of zinc oxide thermoelectrets

The dc electrical conductivity of ZnO nanoparticles and its thermoelectrets have been studied in the present paper. Thermal stability of ZnO nanoparticles has been investigated by DSC. The thermoelectrets were prepared by polarizing the sample by applying different polarizing fields (EP) at constant polarizing temperature (TP) for constant polarization time (tp). The thermally stimulated discharge current (TSDC) studies have been made on ZnO sample at a constant heating rate in the temperature region 313-473 K. It has been observed that the conductivity of ZnO nanoparticles has been increased with increase in temperature and field. The thermograms are plotted between log σ and temperature (103/T). The dependence of TSDC data on polarizing agents i.e. field and temperature is explained on the basis of theoretical predictions

Thermally stimulated discharge conductivity study of zinc oxide thermoelectrets

704-707The dc electrical conductivity of ZnO nanoparticles and its thermoelectrets have been studied in the present paper. Thermal stability of ZnO nanoparticles has been investigated by DSC. The thermoelectrets were prepared by polarizing the sample by applying different polarizing fields (EP) at constant polarizing temperature (TP) for constant polarization time (tp). The thermally stimulated discharge current (TSDC) studies have been made on ZnO sample at a constant heating rate in the temperature region 313-473 K. It has been observed that the conductivity of ZnO nanoparticles has been increased with increase in temperature and field. The thermograms are plotted between log σ and temperature (103/T). The dependence of TSDC data on polarizing agents i.e. field and temperature is explained on the basis of theoretical predictions

Effect of antioxidant on orthodontic bracket bond strength after vital bleaching

Objectives: The objective of this study is to compare the neutralization effect of various antioxidant agents on the bond strength of composite resins on stainless steel and ceramic brackets immediately bonded to previously bleached teeth. Materials and Methods: One hundred and sixty human maxillary premolars were used for the study. Teeth were divided into four groups (n = 40): Group 1 (control), Group 2 (bleached), Group 3 (sodium ascorbate), and Group 4 (tocopherol acetate). Each group was divided into two subgroups, one was bonded with stainless steel and other with ceramic brackets using 3M Transbond XT. Universal testing machine was used to determine the shear bond strength (SBS). Results: Among the metal brackets, Group 1A had the highest SBS (12.18 + 1.41 MPa) and Group 2A had the least SBS (6.18 + 1.49 MPa). Weibull analysis indicated that bond strength for a 90% probability of failure was highest for Group 1A (13.99 MPa) and lowest for Group 2A (8.49 MPa). For ceramic brackets, Group 1B had the highest SBS (13.80 + 1.69 MPa) and Group 2B had the least SBS (8.05 + 1.85 MPa). Weibull analysis indicated that bond strength for a 90% probability of failure was highest for Group 1B (14.61 MPa) and lowest for Group 2B (8.85MPa). Conclusion: The in vitro study showed that bleaching reduced the SBS significantly, and this could be effectively reversed by the application of antioxidants in both metal and ceramic brackets

Correlation of N-terminal pro-brain natriuretic peptide levels in non-alcoholic fatty liver disease

Background: Many organ systems are found to be affected in NAFLD including heart.NT-pro BNP determination has been proven to be useful and accurate for ruling out the diagnosis of heart dysfunction. Aim: To characterize the correlation between NT-proBNP and nonalcoholic fatty liver disease (NAFLD). Method: For this study, 60 cases of NAFLD were examined and evaluated in Department of Medicine, N.S.C.B. Medical College & Hospital, Jabalpur (M.P.) All study subjects were examined by same radiologist for detecting fatty liver and grading by ultrasonography of abdomen; and all patients undergo fibroscan by same technician for measuring liver stiffness measurement . Similarly, NT-proBNP levels were also measured using a commercially available immunochemical system. Result: Our study shows that NT-pro BNP levels are significantly lower in patients of NAFLD without diastolic dysfunction(mean±SD46.17±18.74) and compared to NAFLD patients with diastolic dysfunction(160.89±42.11). Conclusion: Difference in NT- pro BNP levels was significantly observed in NAFLD patients with or without diastolic dysfunction. Therefore, NT ProBNP can be used as a diagnostic tool for diagnosis of NAFLD in patients without diastolic dysfunction

Ergonomic risk factors and their association with musculoskeletal disorders among Indian dentist: A preliminary study using Rapid Upper Limb Assessment

Context: Ergonomics is the scientific study of people and their work. The manufacturers typically do not design to accommodate the dimensions of the individual user. Work-related musculoskeletal disorders (MSDs) have emerged as major health problem among workers in both industrialized and industrially developing countries. Rapid Upper Limb Assessment (RULA) was developed to investigate the exposure of the individual workers to risk factors associated with work-related upper limb disorders. Aims: The assessment of the posture using RULA, which is quick reliable tool to determine the posture, has not been done in the Indian dentist population, indicating the need for the same. Settings and Design: A total of 104 subjects were included from New Delhi/NCR. Subjects and Methods: The procedure was explained, and the questionnaire was distributed and assessment was done using RULA. The MSDs can be recorded using the standard Nordic questionnaire. Statistical Analysis Used: The data were collected from 104 subjects out of the 192 evaluated and was statistically analyzed using SPSS software. Results: The study sample included 70 male and 34 female dentists. The posture of the subjects and the MSDs are not associated with a significant difference as according to Pearson′s Chi-square test (0.231). Conclusions: RULA can be used as a screening tool for postural risks following a short training session regardless of the assessor′s experience in postural risk assessments