Effects of ferrule and diameter of parallel cast post and core on fracture resistance / Efeitos da férula e diâmetro de núcleos metálicos paralelos na resistência a fratura

Objective: The aim of this study was to evaluate the effects of using different diameters of parallel cast posts with, or without ferrule, on the overall fracture resistance of Cast Post and Core (CPC). Material and Methods: Forty (40) endodontically treated human maxillary central incisors were divided into four groups (n=10): [F1] 1.0 mm diameter post with ferrule; [NF1] 1.0 mm diameter cast post without ferrule; [F1.5] 1.5 mm diameter cast post with ferrule; [NF1.5] 1.5 mm diameter post without ferrule. For all teeth, the post space (9.0 mm, in depth) was prepared using ParaPostTM drill. CPC using base metal alloy were fabricated and were cemented using resin modified glass ionomer (RMGI) cement along with the Porcelain Fused to Metal (PFM) crowns. A universal testing machine (Instron) was used to apply horizontal force perpendicular to the long axis of the tooth at the center of lingual surface, until catastrophic failure. Data was submitted to two-way ANOVA and Scheffé tests (P<0.05). Results: Both post diameter and ferrule statistically affected the maximum load at fracture (P=0.004 and P=0.013, respectively). The highest mean values were observed for samples with ferrule and wider post size (490N), while the lowest were observed for samples without ferrule and narrower post size (254N). There was no relationship between the presence of a ferrule and post size (P=0.937). Conclusion: For endodontically treated teeth with no ferrule, a wider-diameter cast post increased fracture resistance of a CPC and PFM crown procedure. (AU)

Objetivo: O objetivo do presente estudo foi avaliar os efeitos de diferentes diâmetros de núcleos metálicos paralelos (com ou sem férula) na resistência a fratura do procedimento restaurador. Material e Métodos: Quarenta (40) incisivos centrais superiores humanos foram tratados endodonticamente e divididos em quarto grupos (n=10): [F1] Diâmetro de 1.0 mm, com férula; [NF1] Diâmetro de 1.0 mm, sem férula; [F1.5] Diâmetro de 1.5 mm, com férula; [NF1.5] Diâmetro de 1.5 mm, sem férula. Para todos os dentes, o espaço foi preparado para o núcleo (9.0 mm, em comprimento) utilizando brocas do ParaPostTM. Os núcleos metálicos e as coroas metalocerâmicas fabricadas foram cimentados utilizando-se cimento de ionômero de vidro modificado por resina. Uma máquina de ensaios universal (Instron) foi utilizada para aplicar uma força horizontal perpendicular ao longo eixo do dente, no centro da face lingual, até falha catastrófica. Os dados foram analisados através de análise de variância de dois fatores e teste de Scheffé (p<0.05). Resultados: O diâmetro do núcleo e a presença (ou ausência) de férula afteram estatiscamente a resistência máxima a fratura do procedimento (P=0.004 e P=0.013, respectivamente). Os maiores valores foram observados para amostras com férula e de maior diâmetro (490N), enquanto os menores valores foram observados para amostras sem férula e de menor diâmetro (254N). Conclusão: Para dentes tratados endodondicamente, com férula, um núcleo de maior diâmetro aumentou a resistência a fratura de procedimentos restauradores envolvendo coroas metalocerâmicas cimentadas sobre núcleos metálicos fundidos. (AU)

Results of global youth tobacco surveys in public schools in Bogotá, Colombia.

BACKGROUND: The purpose of this paper is to use data from the Global Youth Tobacco Survey (GYTS) conducted in Bogotá, Colombia, in 2001 and 2007 to examine changes in tobacco use among youth 13-15 years of age. The current tobacco control effort in Bogotá will be accessed relative to Colombia ratifying the World Health Organization Framework Convention on Tobacco Control (WHO FCTC) in 2008. METHODS: GYTS was implemented in public schools in Bogotá, Colombia, by the Colombian National Cancer Institute. Data were collected from students in classrooms using self-administered procedures. RESULTS: Between 2001 and 2007, ever having smoked cigarettes decreased along with exposure to secondhand smoke (SHS) at home, having an object with a tobacco logo on it, and having been offered free cigarettes by a tobacco company representative. Prevalence of current cigarette smoking did not change from 2001 to 2007 (32.9% and 29.9%). Exposure to pro-tobacco advertising increased, reaching 71.4%, and 73.4% respectively, in 2007. Having been taught about the harmful effects of tobacco use did not change over time. CONCLUSIONS: The government of Colombia ratified the WHO FCTC in 2008. However, Colombia has one of the highest levels of cigarette smoking among 13-15 year olds in the Region of the Americas. The tobacco control effort in Colombia has much work to do, including recognition that the levels of smoking among adolescents are already as high as those of adults. Future declines in tobacco use among adolescents in Bogotá will likely depend on development of a comprehensive tobacco control program.

Prevalence of smoking and other smoking related behaviors reported by the Global Youth Tobacco Survey (GYTS) in four Peruvian cities.

INTRODUCTION: In 2004, Peru ratified the Health Organization (WHO) Framework Convention on Tobacco Control (FCTC) and in 2006 passed Law 28705 for tobacco consumption and exposure reduction. The Global Youth Tobacco Survey (GYTS) provides data on youth tobacco use for development of tobacco control programs. Findings from the GYTS conducted in four main cities in Peru in 2000 and 2003 are reported in this paper and can be used to monitor provisions of the WHO FCTC. METHODS: The GYTS is a school-based survey that uses a standardized methodology for sampling, questionnaire construction, field procedures, and data management. In total, 5,332 and 7,824 students aged 13 to 15 years participated in the 2000 and 2003 surveys conducted in Huancayo, Lima, Tarapoto and Trujillo. RESULTS: In both years, Lima had the highest lifetime (54.6% and 59.6%) and current use of tobacco (18.6% and 19.2%) of the four cities. According to gender, boys smoked more than girls and less than 20% of students initiated smoking before the age of 10. Among smokers, more than 60% bought their cigarettes in a store with no restriction for their age, and approximately 12% had ever been offered "free cigarettes". Around 90% of students were in favor of banning smoking in public places. Changes between 2000 and 2003 included an increase in the percentage of smokers who wanted to have a cigarette first thing in the morning in Tarapoto (from 0% to 1.2%) and a decrease in exposure to tobacco at home in Huancayo (from 23.7% to 17.8%) and Trujillo (from 27.8% to 19.8%) CONCLUSION: While few changes in tobacco use among youth have been observed in the GYTS in Peru, the data in this report can be used as baseline measures for future evaluation efforts. At this time, tobacco control efforts in Peru need to focus on enhancing Law 28705 to include enforcement of existing provisions and inclusion of new laws and regulations. Most of these provisions are required of all countries, such as Peru, that have ratified the WHO FCTC.

Linking Global Youth Tobacco Survey (GYTS) data to the WHO Framework Convention on Tobacco Control (FCTC): the case for Mexico.

BACKGROUND: The adoption of the World Health Organization Framework Convention on Tobacco Control (WHO FCTC) in 2004 marked a critical achievement in efforts to stem the tobacco epidemic in Mexico. The Global Youth Tobacco Survey (GYTS) findings are useful for evaluating achievement of FCTC articles and designing tobacco control programs. OBJECTIVE: To use data from the GYTS conducted in 21 Mexican cities between 2000 and 2005 to monitor Articles in the WHO FCTC. METHODS: The GYTS uses a two-stage cluster sample survey design that produces representative samples of students aged 13-15 years enrolled in public, private and technical schools. The survey was undertaken at 542 schools in 21 cities. The GYTS surveyed 43,950 students during 2000-2005. RESULTS: The current smoking rate ranged from 10.7% to 29.4%. Among never smokers, susceptibility to initiate smoking ranged from 20.2% to 34.4%. Among current smokers, the percentage who bought their cigarettes in a store was above 40% in 6 cities, but significantly declined over five years in the only city with two assessments (Monterrey). Exposure to secondhand smoke in public places was greater than 50% in 15 of the 21 cities. Over 80% of students in all 21 cities reported that they saw of advertisements for cigarettes on billboards. CONCLUSION: Using determinants measured by GYTS in Mexico, the government can monitor the impact of enforcing various provisions of the National Health Law and the progress made in achieving the goals of the WHO FCTC and the Regional strategy. When these goals are met, tobacco consumption and exposure in Mexico will have declined substantially.

Linking Global Youth Tobacco Survey (GYTS) data to the WHO Framework Convention on Tobacco Control (FCTC): the case for Brazil.

OBJECTIVE: The Global Youth Tobacco Survey (GYTS) in Brazil was developed to provide data on youth tobacco use to the National Tobacco Control Program. METHOD: The GYTS uses a standardized methodology for constructing sampling frames, selecting schools and classes, preparing questionnaires, carrying out field procedures, and processing data. The GYTS questionnaire is self-administered and includes questions about: initiation; prevalence; susceptibility; knowledge and attitudes; environmental tobacco smoke; cessation; media and advertising. SUDDAN and Epi-Info Software were used for analysis. Weighted analysis was used in order to obtain percentages and 95% confidence intervals. RESULTS: Twenty-three studies were carried out between 2002 and 2005 in Brazilian capitals: 2002 (9); 2003 (4); 2004 (2) and 2005 (9). The total number of students was 22832. The prevalence rate among the cities varied from 6.2% (João Pessoa, 2002) to 17.7% (Porto Alegre, 2002). CONCLUSION: The tobacco use prevalence rates in 18 Brazilian cities show significant heterogeneity among the macro regions. Data in this report can be used to evaluate the efforts already done and also as baseline for evaluation of new steps for tobacco control in Brazil regarding the goals of the WHO FCTC.

Tobacco use by youth: a surveillance report from the Global Youth Survey project

The Global Youth Tobacco Survey (GYTS) project was developed by the World Health Organization and the US Centers for Disease Control and Prevention to track tobacco use among youth in countries across the world, using a common methodology and core questionnaire. The GYTS is school based and employs a two stage sample design to produce representative data on smoking among students aged 13-15 years. The first stage consists of a probabilistic selection of schools. All students in the selected classes are eligible for the survey. In 1999, the GYTS was conducted in 13 countries and is currently in progress in over 30 countries. This report describes data from 12 countries: Barbados, China, Costa Rica, Fiji, Jordan, Poland and the Russian Federation (Moscow), South Africa, Sri Lanka, Ukraine (Kiev), Venezuela and Zimbabwe. The findings show that tobacco use in the surveyed age group ranged from a high of 33 percent to a low of 10 percent. While the majority of current smokers wanted to stop smoking, very few were able to attend a cessation programme. In most countries the majority of young people reported seeing advertisements for cigarettes in media outlets, but anti-tobacco advertising was rare. The majority of young people being taught in school about the dangers of smoking. Environmental tobacco smoke exposure was very high in all countries. These results show that the GYTS surveillance system is enhancing the capacity of countries to design, implement, and evaluate tobacco prevention and control programmes. (AU)

Geographical variations in AIDS knowledge and attitude among adolescent girls of Jamaica

This article examines geographical differences in AIDS knowledge and attitudes. Data from a survey of 900 adolescent girls in the Caribbean nation of Jamaica indicate significant differences across geography in AIDS knowledge and attitude. Adolescent girls in more central areas have access to different and more sources of information than those in more remote areas. They are also more likely to know persons with AIDS, be more knowledgeable about the clinical manifestations of AIDS, and be more realistic in assessing their susceptibility of HIV. The implications of geographical differences for AIDS education efforts are discussed.(Au)

Prevalence and determinants of caesarean section in Jamaica

The prevalence and determinants of primary ceasarean section in Jamaica were estimated from a survey of women aged 14-19 years. Among 2328 women reporting 2395 live hospital births during the period January 1984 to May 1989, the prevalence of caesarean section was 4.1 percent. Repeat caesarean sections accounted for 1.3 percent of the hospital births during that period. Of the medical complications studied prolonged labour and/or cephalopelvic disproportion carried the highest risks of primary caesarean section, followed by breach presentation, maternal diabetes, a high birth-weight baby, maternal hypertension, and a low birth weight baby. The risk of primary caesarean section increased with maternal age, decreased with parity, was higher for urban than for rural residents, and was higher for births in private versus government hospitals. (AU)

Servicios de salud maternoinfantil y vacunación en Panamá y Guatemala / Maternal and child health services and vaccination in Panamá and Guatemala

En Guatemañla y Panamá se efectuaron en 1983-1984 y 1984-1985, respectivamente, dos encuestas mediante entrevistas, diseñadas para evaluar la medida en que se utilizan los servicios de salud maternoinfantil. En la encuesta panameña se obtuvieron entrevistas completas de 8 240 mujeres de 15 a 49 años de edad, mientras que en la encuesta guatemalteca se realizaron entrevistas completas a 3 670 mujeres de 15 a 44 años de edad. Estas entrevistas se realizaron principalmente para estimar la prevalencia del uso de la contracepción y para proveer datos basados en la población sobre el uso de servicios de salud maternoinfantil, entre ellos los de vacunación a todos los niveles, con objeto de medir el impacto del programa en cada país. Para los propósitos de este análisis, la muestra de la encuesta en ambos países se limitó a mujeres de 15 a 44 años de edad que estuvieran casadas en el momento de la entrevista y que hubieran dado a luz un hijo vivo dentro de los cinco años anteriores. En Panamá, un porcentaje mucho mayor que en Guatemala de mujeres casadas de 15 a 44 años informaron que utilizaban los servicios de salud maternoinfantil. En ambos países, un porcentaje relativamente alto de mujeres que residían en las zonas urbanas dijeron que hacían uso de estos servicios, mientras que las mujeres indígenas de ambos países informaron que hacían un uso relativamente escaso de ellos. Además, se encontraron asociaciones entre la utilización de dichos servicios y el grado de escolaridad de la madre, su ocupación, paridad y el lugar donde tuvo a su último hijo. Asimismo, era más probable que emplearan métodos contraceptivos las mujeres que usaban los tres tipos de servicios de salud maternoinantil que las mujeres que habían dicho que utilizaban solo alguno o ninguno de ellos. En lo que se refiere al grado de cobertura de la vacunación de niños pequeños en Panamá y Guatemala, los datos de la encuesta señalaron que el grado de vacunación era relativamente mayor en Panamá...

Servicios de salud maternoinfantil y vacunacion en Panama y Guatemala / Maternal and child health services and vaccination in Panama and Guatemala

Two surveys designed to assess the extent to which maternal and child health services were being used in Guatemala and Panama were conducted in 1983-1984 and 1984-1985, respectively. The Panama survey obtained complete interviews from 8 240 women 15 through 49 years of age, while the Guatemala survey obtained complete interviews from 3 670 women 15 through 44 years of age. These surveys were conducted principally to estimate the prevalence of the use of contraception and to provide population-based data on the use of maternal and child health services, including immunization levels, in order to measure program impact in each country. For purpose of this analysis, only women 15 through 44 years of age who were married at the time of the interview and who had given birth to a live infant within the preceding five years and included. A considerably higher percentage of married women aged 15-44 reported using maternal and child health (MCH) services in Panama than in Guatemala. In both countries a relatively high percentage of women residing in the urban areas said they made use of these services, while Indian women in both countries reported making relatively tittle use of them. In addition, associations were found between use of MCH services and maternal education, maternal employment, parity, and the type of facilit