OBJECTIVE Because of the great challenges in the diagnosis and treatment of "C" configuration and lack of any systematic information about its occurrence, the purpose of the present study is to determine the prevalence of C shaped root canals in Iranian population. METHODOLOGY An exhaustive search was undertaken to identify published and unpublished researches related to the C-shaped canals b...

BACKGROUND HLA-G gene contains 15 alleles including a null allele, HLA-G*0105N. Previous studies have shown that HLA-G*0105N does not encode the complete HLA-G1 or HLA-G5 isoforms but encodes a functional HLA-G protein with the ability to inhibit NK cell cytolysis. Thus, although the biological functions of HLA-G1 and HLA-G5 proteins are abrogated, other isoforms such as HLA-G2 can replace thei...

Background: This research was designed to establish the posteroanterior (PA) radiograph norms for Iranian adult population. It also aims to distinguish any possible differences between genders. Finally, it will compare these norms with the norms of other populations. Materials and Method: The population enrolled in the study was 60 Iranians aged between 18 and 45 years. Those included in the st...

Background and purpose: Utilization of health care services and food influence the health status. The food and health care expenditure ratios determine the importance level of them in household's consumption expenditures. We aimed to investigate the Iranian rural and urban food and health expenditure ratios inequality during 1998 to 2012. Materials and Methods: This is a descriptive longitudina...

OBJECTIVES This study aimed to evaluate the association of neck circumference (NC) with obesity to determine the sex-specific and age-specific optimal cut-off points of this measure in association with obesity in a national sample of the Iranian paediatric population. METHODS This survey on weight disorders was conducted among a national sample of Iranian children and adolescents, aged 6-18 y...

BACKGROUND Metabolic syndrome (MetS) is the major risk factor for development of type 2 diabetes and cardiovascular diseases in different populations. The aim of this study was to evaluate the prevalence of MetS among Iranian population. METHODS Thirty-four cross-sectional studies were analyzed with a sample of 83227 people. National and international English electronic databases (PubMed, Goo...

BACKGROUND School bullying, the most common type of school violence, comprises a spectrum of aggressive behaviors that involve both perpetrators and victims. OBJECTIVES The current study aimed to investigate the extent and nature of school bullying among middle school students in the North of Iran. PATIENTS AND METHODS A cross-sectional study was conducted on a sample of 834 Iranian middle ...

BACKGROUND Early diagnosis of tuberculosis (TB) is a major key for effective TB program. Evaluation of delay in diagnosis of smear positive TB is needed to evaluation of TB program situation in each country. The aim of this study was to evaluate of diagnosis delay in smear positive tuberculosis patients in Islamic Republic of Iran. MATERIALS AND METHODS In this cross sectional study, all smea...