نتایج جستجو برای: fluoride concentration

تعداد نتایج: 398979  

Background and Objective: Studies have shown that the presence of standard amount of fluoride in drinking water can prevent tooth decay. Meanwhile, higher concentration than permitted amount in drinking water causes bone disease and dental fluorosis. Given the importance of fluoride in drinking water and also GIS ability in spatial analysis of various factors in the groundwater, in this study t...

Journal: :تحقیقات نظام سلامت 0
مهدی اسدی دانشجوی دکتری مهندسی محیط زیست دانشگاه تهران، تهران، ایران و عضو هیأت علمی مرکز تحقیقات آلاینده های محیطی، دانشگاه علوم پزشکی قم، قم، ایران سیامک محبی استادیار، مرکز تحقیقات سیاست گذاری و ارتقا سلامت،دانشگاه علوم پزشکی قم،قم،ایران سمیه بهنامی پور کارشناس ارشد شیمی تجزیه، دانشکده بهداشت، دانشگاه علوم پزشکی قم، قم، ایران فاطمه حسن پور دانشجوی کارشناسی بهداشت محیط، دانشگاه علوم پزشکی قم، قم، ایران محمد حضوری استادیار، مرکز تحقیقات علوم تغذیه، دانشگاه علوم پزشکی قم، قم، ایران

background: the human body gets fluorine from a variety of sources including food and water. this element is essential in order to prevent tooth decay. however, high concentrations of this element led to a lot of dental fluorosis and skeletal injuries. this study aimed to measure the concentration of fluoride in water and tea consumed in the city of qom. methods: the present study is cross-sect...

Fluoride in drinking water has a profound effect on teeth. Since drinking water is an important source of fluoride, the evaluation of the fluoride content of water resources is necessary. Temporal variations and spatial distribution of fluoride in drinking water of some selected parts of Kurdistan Province, Iran, have been studied using geographic information system (GIS) techniques. Thus, 40 v...

Journal: :Brazilian dental journal 2014
Constanza Estefany Fernández Livia Maria Andaló Tenuta Paulo Zárate Jaime Aparecido Cury

There is no consensus about the clinical recommendation of the time that Duraphat® varnish should be maintained on enamel surfaces without suffering mechanical disturbance by the patient. Considering the importance of calcium fluoride (CaF2)-like reservoirs on the anticaries effect of professional fluoride application, an in vitro study was designed to test the reactivity of Duraphat® varnish w...

Journal: :Journal of hazardous materials 2009
Hai-rong Li Qing-bin Liu Wu-yi Wang Lin-sheng Yang Yong-hua Li Fu-jian Feng Xiao-yu Zhao Kun Hou Ge Wang

The objective of this study was to detect the fluoride level in the drinking water and the urine of habitants aged 16-55 years living in Inner Mongolia China. Furthermore, fluoride concentration of the brick tea infusion samples which were drunk by Mongolia herdsmen in everyday life living in SumuErga village of Ejin Horo Banner, Inner Mongolia China was also determined. A total of 117 particip...

ژورنال: طلوع بهداشت یزد 2014
آخوندزاده, بنت الهدی, احرامپوش, محمد حسن , قانعیان, محمد تقی , محب راد , بتول ,

Abstract Introduction:Fluoride is one of the essential elements for human health and presence of its acceptable value prevents from tooth decay but excessive absorption of fluorine into the body cause many chronic problems such as flourosis. The aim of this study was to evaluate the effect of &alpha-Alumina and &gamma -Alumina on removal of fluoride from water. Methods: This experimental ...

Journal: :Schweizer Monatsschrift fur Zahnmedizin = Revue mensuelle suisse d'odonto-stomatologie = Rivista mensile svizzera di odontologia e stomatologia 2006
Joseph S Guindy Ralph Gysin Marius Kränzlin Thomas C Gasser Kirsten Hauck Jürg Meyer

The canton of Basel-Stadt was the only canton in Switzerland which introduced drinking water fluoridation (DWF) at 1 ppm (mg/l). All other cantons have relied on fluoridated domestic salt at 250 ppm F as the main vehicle for basic fluoride exposure. It has been suggested that persons living and working in the DWF areas or persons commuting to the DWF areas may be exposed to higher than optimal ...

Journal: :Journal of hazardous materials 2007
Ching-Yao Hu Shang-Lien Lo Wen-Hui Kuan

A variable order kinetic (VOK) model derived from the Langmuir equation was applied to specify the kinetics of the fluoride removal reaction for electrocoagulation (EC). Synthetic solutions were employed to elucidate the effects of the initial fluoride concentration, the applied current and the initial acidity on the simulation results of the model. The proposed model successfully describes the...

2003
W. Czarnowski E. Hać J. Krechniak

The aim of this study was (a) to determine the concentration of fluoride and cadmium in urine of 1240 children ( 635 boys, 605 girls) from Gdańsk, aged 7-14; and (b) to examine whether a correlation exists between age and sex of children, the location of the schools, and the urinary levels of fluoride and cadmium. Fluoride was determined potentiometrically using a fluoride-specific electrode. C...

2015
Hae-Youn Ko Si-Mook Kang Ho-Keun Kwon Baek-Il Kim

Copyright © 2015 by Journal of Korean Academy of Oral Health This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. Objectives: The aims of this ...

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