The Importance of Long Time Follow-Up after Vital Pulp Therapy: A Case Report

This report describes a case of an eight years old girl who was treated for complicated crown fracture of right maxillary central incisor because of a sport accident. For the tooth total pulpotomy was performed in order to achieve apexogenesis and the tooth was restored with a composite resin. The patient was reviewed over 10 years. At first the tooth showed continued root development and complete apex formation following vital pulp therapy, however, after 10 years the tooth developed pulp necrosis and periapical radiolucency. Following root canal therapy, periapical radiolucency has been healed

Dimensional Accuracy of Polyvinyl Siloxane Impression Materials Considering Impression Techniques– A Literature Review

Objectives Impression accuracy is the main determinant of the fit, form and function of prosthetic restorations. Polyvinyl siloxane (PVS) is the material of choice in most clinical situations. The purpose of this paper is to provide an up-to-date review of scientific articles which discuss the dimensional accuracy of PVS impression material using various impression techniques, tray types and spacers. Besides, the procedure, advantages and disadvantages of commonly used impression techniques, technique modifications and innovations are also reviewed.Method An electronic search of scientific papers from 1990 to 2018 was carried out using MEDLINE and Google Scholar databases using the search terms “accuracy and polyvinyl siloxane and impression technique” and “accuracy and addition silicone and impression technique”.Results Searching the key words yielded a total of 312 articles. By application of inclusion and exclusion criteria, the obtained results were further reduced to 35 citations.Conclusion Impression technique is a critical variable in the accuracy of PVS impressions. Dual-phase 2-step technique with 1 to 2 mm space for the light body is proven to be highly accurate and is still considered as the standard technique. The use of 2-step technique without providing a space for the wash material is rejected by the literature. Triple-phase 2-step techniques including “matrix impression system” have also functioned well and even superior to traditional dual-phase 2-step technique. Papers suggest that custom trays do not significantly improve the accuracy of impressions and rigid stock trays are suitable alternative

Identification and Leveling of Strategic Entrepreneurship Indicators

The turmoil in the business environment has led to unpredictable changes that, on the one hand, have created new opportunities to gain value and, on the other hand, have hampered companies' competitive advantages and, in some cases, led to their disappearance. In such an environment, successful organizations, especially knowledge-based companies, seek to use strategic entrepreneurship, that is, taking advantage of current competitive advantages and discovering innovations that determine future competitive advantage, as a key factor in achieving success. The need for strategic management and entrepreneurship activities simultaneously in the form of strategic entrepreneurship leads to a significant impact on the success of the company, the development of competitive advantages, effective allocation of resources in proportion to current and future activities. This research has used the meta-combined method to explain and identify the indicators of strategic entrepreneurship which has led to the identification of 70 codes, 16 concepts and 6 categories and has leveled them using the interpretive structural modeling method. It has been the case that environmental factors at the fourth level, organizational factors, economic factors and innovative factors at the third level and individual and social factors at the second level and entrepreneurial opportunities and capabilities at the first level

The Stress Level and Related Factors in Students of School of Dentistry, Kerman University of Medical Sciences, Iran

Background & Objective: Dentistry is a stressful job and dental students are exposed to educational and environmental stresses. The aim of this study was to determine the stress level in dental students. Methods: This cross-sectional study was conducted on students of School of Dentistry, Kerman University of Medical Sciences, Iran. Data were collected by Depression, Anxiety and Stress Scales (DASS-21) standard questionnaire and analyzed by linear regression and t-test. Results: 32.6% of students had moderate and 4.3% had severe stress. There was no significant differences between sex, academic year, mean of scores, and stress level. Married students had more stress (P = 0.037). Students staying with their parents had low stress level (P = 0.047). In 66% of students, the university issues were stressor. Conclusion: Based on the result of this study, stress level among dental students is fairly high; greater attention to this issue is recommended. Keywords Stress Dental students Kerman Ira

Effective Factors on Theoretical Classes Attendance of Dentistry Students of Kerman University of Medical Sciences, Iran

Background & Objective: Classrooms are suitable environment for transferring teachers’ experiences to students and gaining a better understanding of educational contents. The students’ absence from theoretical classes has been one of the increasing and most important educational problems in medical universities in recent years. This study was performed to determine factors effective on theoretical class attendance according to the point of view of dentistry students of Kerman University of Medical Sciences, Iran, in 2012. Methods: This cross-sectional study was conducted on 150 students of the School of Dentistry, Kerman University of Medical Sciences, in 2012. Data collection tool was a questionnaire consisting of 2 parts: demographic characteristics and effective factors on theoretical class attendance questionnaire. The questionnaire consisted of 20 questions scored based on a 5-point Likert scale, from very effective to ineffective, and scores ranging from 0 to 80. Higher scores indicated more effective factors. Data were analyzed by SPSS software through linear regression analysis. Values of P < 0.05 were considered significant. Results: Of the 150 participants, 58.7% were female, 83.3% were single, and 61.3% were native students. The mean age of the participants was 20.7 ± 1.7 years. The mean score of the students was 58.24 ± 9.59. A significant statistical relationship was observed between area of residence, year of education, and sex of students and mean score of questionnaire. Among factors effective on theoretical class attendance, the highest score belonged to appropriate teaching method, teachers' scientific proficiency, students' interest in the related topic. However, taking part in the class as a duty and active involvement of students had the lowest scores. Conclusion: The findings of the present study showed that attendance in classes is affected by factors related to both teachers and students. However, appropriate teaching method, teachers' scientific proficiency, and students' interest in the related topic are the main factors which determine students' attendance in the classes. Keywords Effective factors Attendance Theoretical lessons Dentistry students Kerman (Iran

Alteration of hepatocellular antioxidant gene expression pattern and biomarkers of oxidative damage in diazinon-induced acute toxicity in Wistar rat

In the present survey, the plasma level of diazinon after acute exposure was measured by HPLC method at a time-course manner. In addition, the impact of diazinon on the expression of the key genes responsible for hepatocellular antioxidative defense, including PON1, GPx and CAT were investigated. The increase in oxidative damages in treated rats was determined by measuring LPO, protein carbonyl content and total antioxidant power in plasma. After administration of 85 mg/kg diazinon in ten groups of male Wistar rats at different time points between 0-24 hours, the activity of AChE enzyme was inhibited to about 77.94 %. Significant increases in carbonyl groups and LPO after 0.75 and 1 hours were also observed while the plasma antioxidant power was significantly decreased. Despite the dramatic reduction of GPX and PON1 gene expression, CAT gene was significantly upregulated in mRNA level by 1.1 fold after 4 hours and 1.5-fold after 24 hours due to diazinon exposure, compared to control group. Furthermore, no significant changes in diazinon plasma levels were found after 4 hours in the treated rats. The limits of detection and quantification were 137.42 and 416.52 ng/mL, respectively. The average percentage recoveries from plasma were between 90.62 % and 95.72 %. In conclusion, acute exposure to diazinon increased oxidative stress markers in a time-dependent manner and the changes were consistent with effects on hepatic antioxidant gene expression pattern. The effect of diazinon even as a non-lethal dose was induced on the gene expression of antioxidant enzymes. The change in antioxidant defense system occurs prior to diazinon plasma peak time. These results provide biochemical and molecular evidence supporting potential acute toxicity of diazinon and is beneficial in the evaluation of acute toxicity of other organophosphorus pesticides as well

National and sub-national environmental burden of disease in Iran from 1990 to 2013-study profile

Development of national evidence-based public health strategies requires a deep understanding of the role of major risk factors (RFs) and the burden of disease (BOD). In this article, we explain the framework for studying the national and sub-national Environmental Burden of Disease (EBD) in Iran as a part of the National and Sub-national Burden of Disease (NASBOD) study.; The distribution of exposures to environmental RFs and their attributable effect size over 1990-2013 will be estimated through comprehensive reviews of either published or unpublished sources. Statistical modeling will be used to impute missing data in the distribution of RFs exposures for each district-year. National and sub-national BOD attributable to these RFs will be estimated in the following metrics: Prevalence, death, years of life lost due to premature death (YLL), years of life lost due to disability (YLD), and disability-adjusted life years lost (DALYs). The BOD attributable to the current distribution of exposures will be compared with a counterfactual exposure distribution scenario-here, the theoretical-minimum-risk exposure distribution. Inequalities in the distribution of exposure to RFs will be analyzed and manifested nationwide using geographic information systems.; The EBD study aims to provide an official report to Iranian Ministry of Health and Medical Education, to publish a series of articles on the exposure trends of the selected environmental RFs, to estimate the BOD attributable to these RFs, and to assess inequalities and its determinants in the distribution of exposure to RFs. Iran's territory is large with diverse population, socioeconomic, and geographic areas. Results of this comparative risk assessment study may pave the way for health policy makers to plan more comprehensive and cost-effective evidence-based strategies

Effects of Thyme methanolic Extract on Ruminal Protein Degradation of Soybean Meal using Nylon Bag Technique

Abstract: This study was conducted to evaluate effects of Thyme methanolic extract (0 and 0.15 mL/30 mL buffered rumen fluid) on ruminal Crude Protein (CP) degradation parameters of Soybean Meal (SBM). Nylon bags filled with 5 g of each of untreated or Thyme methanolic extract treated soybean meal, were suspended in the rumen of three fistulated Gezel rams for 0, 2, 4, 8, 16, 24 and 48 h, and obtained data were fitted to a nonlinear degradation model to calculate ruminal degradation characteristics. Thyme methanolic extract treatments significantly decreased protein degradability of soybean meal on different incubation times. Effective rumen degradable crude protein at a rate of 0.02/h, for untreated and Thyme methanolic extract treated soybean meal, 82.43 and 77.80%, respectively were estimated. Although Thyme methanolic extract decreased (p&lt;0.05) the water soluble fraction (a), constant rate of degradation (c) and total degradability (a+b) of CP degradation but potentially degradable fraction (b), were not significantly affected by Thyme methanolic extract

The Impact of Skill Integration on Task Involvement Load

The present study investigated whether word learning and retention in a second language are contingent upon a task's involvement load, i.e., the amount of need, search, and evaluation the task imposes. Laufer and Hulstijn (2001) contend that tasks with higher degrees of these three components induce higher involvement load, and are, therefore, more effective for word learning. To test this claim, 64 Iranian intermediate EFL learners were selected based on their performance on the Preliminary English Test (PET). The participants were randomly assigned to two equal groups. Each group completed different vocabulary learning tasks that varied in the amount of involvement they induced. The tasks were jigsaw task (Group A) and information gap task (Group B). During the ten treatment sessions, recall and retention of the 100 unfamiliar target words were tested through immediate and delayed posttest. Data were analyzed using repeated measure ANOVA. The results indicated that learners benefited more from jigsaw task with higher involvement load. This study supported the Involvement Load Hypothesis, suggesting that higher involvement induced by the task resulted in more effective recall; however, no significant difference was observed between the two tasks in the retention of the unknown words

Legitimation Issue in Ayatollah Khamenei's Religious Democracy Theory

"People Involvement" In ideologies and systems related to democracy, especially religious democracy, is the common concept which creates a visible difference between democrat systems and non-democrat systems. People Involvement as an important concept is a justification for democrat and religious democrat states and from this perspective, it is possible to create different expression regarding to democracy. According to this article, there are two main perspectives related to justification of people involvement. In this case, there are two patterns; "Single-dimensional" legitimation pattern and "Multi-dimensional" legitimation pattern. The first one oversees one aspect of government like the competence of the ruler or process of acquiring power and enforcing it, and the second one oversees all aspects of the government like conclusions and effectiveness in addition to the previous case. In this article, G.T. methodology has been used. The Ayatollah Khamenei's position is considered as the second group where legitimation is a multi-dimensional pattern and oversees four dimensions of government