The Effect of Calcium Chloride on Push-Out Bond Strength of Calcium-Enriched Mixture Cement and Mineral Trioxide Aggregate

Introduction: This in vitro study investigated the effect of adding 10% calcium chloride (CaCl2) on push out bond strength of calcium-enriched mixture (CEM) cement and mineral trioxide aggregate (MTA) to root canal dentin. Methods and Materials: A total of 120 root dentin slices with 2 mm thickness were prepared from sixty single-rooted human teeth. Dentinal discs were enlarged to achieve 1.3 mm diameter. The specimens were randomly allocated into eight groups (n=15). Dentin discs were filled with either CEM cement or MTA with or without CaCl2 and the push out test was performed after 3 and 21 days. Data were analyzed with two-way ANOVA test. The level of significance was set at 0.05. Results: There was an interaction effect amongst all groups (P=0.028). After 3 days, CEM cement showed a significantly lower bond strength than other groups (P<0.05) while MTA demonstrated significantly higher bond strength than CEM cement with or without CaCl2 (P=0.001). After 21 days, CEM cement with or without CaCl2 had no significant difference with other groups (P>0.05). However, the bond strength of MTA decreased when CaCl2 was added (P=0.011). Conclusion: The addition of 10% CaCl2 increased the push out bond strength of CEM cement and improved it over time; while, this substance aggravated this property for MTA.Keywords: Calcium Chloride; Calcium-Enriched Mixture Cement; Mineral Trioxide Aggregate; Push-Out Bond Strengt

Exploring barriers and challenges in protecting residential fire - related injuries: a qualitative study

Background: Building fires can be a great threat to the safety of residents, and can lead to economic and social damage. Exploring the views of stakeholders is a great source for understanding the factors that affect fires. The purpose of this study was to explore stakeholders’ experiences of unintentional fire-related injuries in residential buildings in Iran. Methods: This qualitative study was carried out using grounded theory. The study was conducted in Iran, in 2017. The study participants consisted of 25 people including stakeholders who had practical experience/or were knowledgeable in the field of preventing and fighting building fires. Purposeful and theoretical sampling were used for data collection. Data were analyzed based on constant comparative analysis and according to recommendations by Strauss and Corbin. Results: "Lack of a comprehensive approach to prevention of fire-related injury" emerged as a core variable which impacted on residents' safety against fires. The findings were classified into four groups of challenges related to the structure of building, socio-economic challenge, residents of the building and rescue services. Conclusions: Based on participants` experiences, unintentional fire-related injuries in residential buildings are affected by cultural context and economic, social and geographical factors. Improving the safety against unintentional fire-related injuries in residential buildings requires multidisciplinary operations including both change and improvement of the building construction and change in the beliefs and practices of residents to increase safety against fires

Preventive measures for fire-related injuries and their risk factors in residential buildings: a systematic review

Abstract: Background: Every year, a large number of people lose their lives or become injured seriously as a result of fires. Fires in buildings pose a great threat to resident safety. The aim of this systematic review is to identify preventive measures for fire-related injuries in residential buildings, taking into account associated risk factors. Methods: In this study, a systematic review was performed of all studies conducted in the field of residential building fires, influencing factors and available safety procedures. From the earliest record up to 7 July 2017, databases of PubMed, Web of Science/Knowledge, and Scopus were searched and selected articles included in the study. Results: A total of 5,613 published articles were examined, of which 30 were finally found to meet the inclusion criteria. The findings of the study were included in two main groups of preventive measures and risk factors for residential building fires and related injuries. Regarding preventive measures, the factors to reduce the risk of fire-related injuries raised in the studies under review included rule amendments, changes and modification of the environment, behavior change such as emergency evacuation during fire occurrence, improvements to emergency medical services, and awareness-raising. Also, many of the studies showed that areas with a large number of young children, older people, people with physical and mental disabilities, alcohol and drug addicts, smokers, single-family households and low-income families were particularly at risk of fire-related injuries and deaths. Conclusions: There are features in residential buildings and attributes among residents that can be related to fire hazard and fire-related injuries and deaths. The most important point of this study is to focus on preventive strategies including environmental modification, promotion of safety rules and changes in risk behavior among residents. Policy makers should pay more attention to these important issues in order to promote safety and injury prevention in relation to building fires

Fall Injuries Prevention among Rural Population, with Contribution of Rural Health Workers

Introduction: Fall injuries are one of the important health problems in worldwide. Knowledge about fall injuries is limited in low and middle-income countries in general and in Iran in particular. This study aims to document the epidemiology of injuries among rural community and to determine how fall injury is controlled and prevented community health workers, known as Behvarzes. Methods: The study was a six-month prospective injury data collection that took place in rural area of Toyserkan County, located in Iran, focused on severe injuries. About 100 subjects were investigated and documented by all Behvarzes using the logbook. At the end of data collection Behvarzes were gathered in a number of group sessions to reflect about injury prevention measures and barriers in the community. Results: A total of 23 severe fall injuries (two fatal) were reported during the follow-up period with an annual estimated incidence rate of 8/10 000 (95% CI: 6-11). The incidence rate of severe falls was significantly higher among males than females (12/10 000 vs. 3/10 000 person-years). Fall injury rate was also higher among people over 65 years (24/10 000 person-years). The injury analyses revealed that Behvarzes often considered that the adoption of safe behaviour/practice could help fall injuries prevention (17 out of 23). Furthermore, barriers or risk factors for fall injury prevention were related mostly to human factors (for all 23 cases) followed by physical environmental factors. Conclusion: It seems community health workers(known as Behvarzes) are aware and can provide the variety of suggestions and can determine several context- relevant countermeasures for fall injury prevention and even highlight potential barriers to be prevented in their areas

Fatal Road Traffic Injuries in Hamadan Province, Iran

Introduction: Road traffic injuries (RTIs) are important health problems in the world and particularly in the low and middle-income countries. The prevention of RTIs needs vast coordinated and comprehensive efforts. Iran has one of the highest number of deaths due to the RTIs in the world. The objective of this study was to determine the epidemiological characteristics of fatal RTIs in Hamadan Province, Iran. Methods: This cross-sectional study was conducted in Hamadan province of Iran, during a 24-month period, from 21 March 2009 to 20 March 2011. The data of fatal injuries were obtained from the Forensic Medicine Department of Hamadan province. The data were analyzed by using statistical package for social sciences (version16). Results: This study showed that a number of 1434 road traffic related mortality was reported during two years, including 730 in 21 March 2009 to 20 March 2010 and 704 in 21 March 2010 to 20 March 2011. The highest number of deaths occurred among men (78.66%) and in the age group of 21-40 years (38%). The highest number of deaths occurred among the illiterate and low-literate individuals (52.1%); whereas, the lowest number of deaths occurred among people with university education (9.13%). Furthermore, the most fatal crashes occurred in the summer (35.56%). The head injuries were the most common cause of fatal RTIs (50.20%). The most of the vehicles which were involved with crash related deaths were car and the most of the deaths occurred in the scenes of crashes (48.39%). This study showed that the highest number of deaths occurred among drivers (40.65%) and were on the roads outside the cities (65.13%).   Conclusion: The results of this study showed that RITs should be regarded as important health problems. Their characteristics, which were determined in this study, can help to develop more appropriate intervention programs. &nbsp

Common Causes of Anaphylaxis in Children

Background Anaphylaxis is an acute, systemic, and potentially fatal allergic reaction. Many things can cause anaphylaxis potentially but some agents are more common like some foods (milk, egg, soy, wheat, peanut, tree nut, shellfish, and fish), insect stings, medications, latex, and food-dependent exercise-induced anaphylaxis. The goal of this study is to show the common causes of anaphylaxis among the children with anaphylaxis history who were referred to the Immunology, Asthma and Allergy Research Institute (IAARI) during a 4-year period (2005-2009).Methods and Materials During those 4 years, we registered all children (<14 years old) with a history of anaphylactic reaction. To prove the cause of anaphylaxis, we performed skin prick tests with suspected agents according to their history and measured specific IgE against them by the ImmunoCAP test. Recognition of common allergens was based on having a positive history for 1 allergen and positive skin prick test or specific IgE for that at the same time, or having positive results from both tests when the allergen was unclear. Idiopathic anaphylaxis was a reaction when any known allergen and positive tests were not obtained.Results One hundred ninety-three nonfatal anaphylactic attacks among 63 children were recognized. In total, the most current cause of anaphylaxis in children was food (89.7%). Milk (49.3%) and wheat (26.1%) were the most common. Other foods were egg (8.7%), nuts (2.8%), and spices (2.8%). Six children (8.7%) were sensitive to multiple food allergens like milk, egg, and wheat. Five (7.1%) of 63 patients had anaphylactic attack because of stinging. Wasp was the trigger in 3 (4.3%) of them and honeybee was the cause in 1 (1.4%). The last one was because of unknown hymenoptera. There were 2 idiopathic cases of all 63 patients.Conclusions Food allergens, especially milk and wheat, are the most common cause of anaphylaxis in children. Because anaphylaxis can be fatal, it is advisable to recognize its causes in different communities to prevent recurrent attacks. Keywords: anaphylaxis, common causes, childre