The global prevalence of dental healthcare needs and unmet dental needs among adolescents: a systematic review and meta-analysis.

OBJECTIVES: Access to dental healthcare services is a major determinant of dental health in communities. This meta-analysis was conducted to estimate the global prevalence of dental needs and of unmet dental needs in adolescents. METHODS: PubMed, Web of Science, and Scopus were searched in June 2018. The summary measures included the prevalence of met and unmet dental needs. A meta-analysis was performed using the inverse variance method to obtain pooled summary measures. Out of 41,661 retrieved articles, 57 were ultimately included. RESULTS: The pooled prevalence of orthodontic treatment needs was 46.0% (95% confidence interval [CI], 38.0 to 53.0), that of general treatment needs was 59.0% (95% CI, 42.0 to 75.0), that of periodontal treatment needs was 71.0% (95% CI, 46.0 to 96.0), and that of malocclusion treatment needs was 39.0% (95% CI, 28.0 to 50.0). The pooled prevalence of unmet dental needs was 34.0% (95% CI, 27.0 to 40.0). CONCLUSIONS: The highest and lowest prevalence of unmet dental needs were found in Southeast Asia and Europe, respectively. The prevalence of dental needs was higher in the countries of the Americas and Europe than in other World Health Organization (WHO) regions. The prevalence of unmet dental needs was higher in Southeast Asia and Africa than in other WHO regions. KEYWORDS: Adolescent; Dental health services; Meta-analysis; Prevalenc

The effects of the electric-magnetic barrier on the spin transmission in the multibarrier semiconductor heterostructures

In the present paper, we study spin transmission in the multibarrier semiconductor heterostructures based on single particle effective mass approximation. These structures are double-barrier and triple-barrier semiconductor hetero-structures that a metallic ferromagnetic is deposited on them. Using Airy function and magnetic barriers approximated by delta function, we calculate transmission coefficient of tunneling electrons and spin polarization. Our results have shown that the parameters as the height and width of the electrical potential barrier, wave vector parallel to the barrier, applied bias voltage and magnetic field are effective parameters in determination of the transmission coefficient

Global prevalence of unmet need for mental health care among adolescents: A systematic review and meta-analysis

Purpose: Globally mental disorders affect a large number of adolescents. The unmet need for health care of mental health problems is common among adolescents. The aim of this systematic review and meta-analysis was to estimate the global prevalence of unmet needs of mental health care among adolescents. Methods: PubMed, Web of Sciences and Scopus, were searched by June 2018 using a pre-designed search strategy. The summary measure was the prevalence of unmet need for mental health care. The inverse variance method was used in meta-analysis, and the results were reported using the random-effects model at a 95 confidence interval (CI). Results: Out of 30,154 retrieved studies, 15 cross-sectional studies met the eligibility criteria and included in the meta-analysis. The included studies involved 51,309 participants, which 34,476 of them required the mental health care services. The overall pooled prevalence of unmet need for mental health care was 54.0 (95 CI: 41.0, 67.0; I2 = 99.9). Prevalence among adolescents with any mental disorder, general population of adolescents, and high-risk adolescents were 58.1 (46.8, 69.5), 51.4 (30.2, 72.7), and 31.0 (29.0, 33.0) respectively. Conclusion: Based on the results of this systematic review a considerable proportion of adolescents with mental health problems, have not received the required mental health care

The Epidemiology of Aggression and Associated Factors among Iranian Adult Population: A National survey

Background: This survey was conducted to determine the level of aggression among the Iranian adult population and underlying predisposing factors. Study design: A cross-sectional study. Methods: This cross-sectional study included 10,957 participants, involving 23 out of the 31 provinces of Iran in 2019. The outcome of interest was aggression, evaluated by the Buss & Perry aggression questionnaire. The association between aggression and 34 demographic, behavioral, social, and cultural characteristics was assessed using simple and multiple linear regression. Results: The overall mean (SD) score of aggression was 77.10 (22.53). Based on the severity of aggression, the participants were categorized into four groups as follows: 2,464 (23.1%) nonaggressive, 4,692 (43.9%) mild, 3,071 (28.8%) moderate, and 454 (4.2%) severe aggressive. Aggression was more likely to occur in people with the following characteristics: younger ages, having several siblings, lower ranks of birth, having an intimate friend of the opposite sex, having an aggressive father/mother, history of parental divorce, interest in watching action/porn movies, listening to music, history of escape from home/school, using neuropsychiatric drugs, using illicit drugs, history of suicidal thoughts/attempt, and family conflict and hostility. Aggression was less likely to occur with the following characteristics: reading, regular physical exercise, the ability to control anger, regular prayer, adherence to avoid lying, respect to other people's rights, sexual satisfaction, and attachment to parents. Conclusions: A majority of the population has some degree of aggression. Aggression is a multifactorial behavior corresponding with several demographical, social, cultural, and religious factors, some of which back to early childhood events