الملخص
Introduction: Commonly used polymethyl methacrylate (PMMA) denture base material cannot be considered as ideal due toinferior thermal and mechanical properties.Aim: The aim of the study was to evaluate and compare the thermal conductivity, flexural strength, and surface hardness ofheat cure acrylic resin incorporated with 10 wt.% and 15 wt.% alumina and conventional denture base resin.Materials and Methods: A total of 108 specimens were prepared. Specimens were divided into three main groups. Group Aspecimens were disk shaped (50 mm × 5 mm) and used for measuring thermal conductivity. Groups B and C specimens wererectangular shaped (65 mm × 10 mm × 3 mm) and were used for measuring flexural strength and surface hardness, respectively.Each group was further divided into three subgroups (1, 2, and 3) depending on the concentration, namely, PMMA without filler(control), PMMA + 10 wt.% of Al2O3, and PMMA + 15 wt.% of Al2O3 containing 12 samples each. Thermal conductivity wasmeasured using a modified guarded hot plate apparatus. Flexural strength was assessed with a three-point bending test usinga universal testing machine. Hardness testing was conducted using a Vickers Hardness Tester. The results were analyzedusing one-way ANOVA followed by post hoc comparison by Tukey’s method.Results: Mean values of thermal conductivity were (in W/mK) 0.190, 0.231, and 0.275 for subgroups A1, A2, and A3, respectively.The mean flexural strength values were (in MPa) 56.62, 66.73, and 74.24 for subgroups B1, B2, and B3, respectively. Meanvalues of surface hardness was calculated to be (in HV) 15.17, 16.51, and 17.91 for subgroup C1, C2, and C3, respectively.There was statistically significant improvement in thermal conductivity, flexural strength, and surface hardness after incorporationof alumina and the increase was in proportion to the weight percentage of alumina filler.Conclusion: Incorporation of alumina into heat cure denture base resin significantly improved the thermal conductivity, flexuralstrength, and surface hardness.
الملخص
Background: Non communicable diseases like obesity and diabetes are increasing worldwide, healthcare physicians are also not immune to this morbidity. The objective of this study is to find the prevalence of obesity and diabetes among healthcare physicians.Methods: The study was done at a tertiary care hospital in Pondicherry. All adult health care physicians of both sexes working in the hospital and giving informed consent to participate in the study were included. Pregnant physicians and those who are not willing to give written consent for participation in the study were excluded from the study. The study was done as a cross sectional study using a pretested standardized questionnaire. Age, sex, demographic data, height, weight, diet habits, family history of diabetes, exercise, medication in all the health care physicians were recorded and studied.Results: Of the total one hundred health care physicians, there were 50 male and 50 female physicians. Among the female physicians, there were 17 of age 41 to 50 years. There were 27 male and 34 female physicians with body mass index of 25 to 29.9. Six males and four females had diabetes mellitus. Six physicians were doing regular exercise. Four physicians were taking both oral anti hyperglycemic drugs and insulin.Conclusions: Doctors are aware and educated part of the society but there is high prevalence of obesity and diabetes mellitus among healthcare physicians. Doctor have to be motivated to take care of their health and to prevent lifestyle disease complication. Further regular screening for diabetes and obesity has to be done for doctors.
الملخص
Diffuse unilateral subacute neuroretinitis [DUSN] can be a diagnostic dilemma photocoagulation of the subretinal worm is an effective treatment for eradication. Early laser photocoagulation has been advocated. We report a case of a middle aged man who presented with decreased vision and a sub retinal macular worm that required two laser sessions for complete eradication of the worm