Search published articles


Showing 3 results for Fluoride

H Kamani, A Paseban, E Bazrafshan, F Kord Mostafa Pour, H Ansari,
Volume 1, Issue 1 (12-2008)
Abstract

Introduction: Tooth decay is one of the most important health problems. Most of people throughout their lives face this problem. Receiving a certain amount of fluoride through drinking water or other topical fluorine carriers can increase the teeth resistance and thus reduce tooth decay.
The aim of this study was to determine the amount of fluoride in drinking water in Zahedan and DMFT index in students aged 8-12 years old and their relationship.
Materials and Methods: In this descriptive cross-sectional study, 800 students were selected for evaluation of DMFT, and 34 water samples were taken to determine the amount of fluorine in drinking water. In this study, students were selected randomly. The data was collected by examination and completion of the form by oral health technicians. Determination of fluoride content was done by SPADNS method using Spectrophotometer.
Results: The mean DMFT index in this study was 2.41±2.12. The highest rate was for the 9-year age group with an average of 3.02±2.55 and the lowest was for the 12-year-old group with an average of 1.96±1.8 The DMFT value was lower in girls than in boys. (p<0.05). In all water samples, the concentration of fluoride was lower than the standard.
Discussion and conclusion:According to the WHO, the quality of oral and dental care was relatively low. On the other hand, the average concentration of fluoride in drinking water in Zahedan is less than standard. Therefore, the fluoride needed by the body should be provided through waterfluoridation, the use of local fluoride carriers, or the use of fluoride-containing beverages, such as tea and other foods.
 
H Rahmani , A Rahmani, K Rahmani, Ah Mahvi ,
Volume 3, Issue 4 (3-2012)
Abstract

Abstract Background & Objective: High concentrations of fluoride in drinking water can cause skeleton and dental crises, also create abnormalities at another widely in humans. Material & Methods: In this study, zeolite of clinoptilolite being modified by La3+ ions was used to remove fluoride from aqueous solution. In this study, contact was using a fixed bed column with upward flow. The residual fluoride content was measured using DR5000. The parameters of initial fluoride concentration, adsorbent concentration, pH solution was done between natural and synthetic samples. Result: Results showed that increasing the initial concentration of fluoride from 2.5 to 10 mg/L, result decreased of time to Breakthrough Curve and the volume of water but the absorption capacity adsorbent (qb) increased. By increased of adsorbent from 10 to 17 gr and reach to BTC, volume of water treated and sorbent adsorption capacity was increased. The natural pH (5-9) observed of little effect on the absorption, but at pH less than 3, significantly decreased absorption efficiency. Anions in natural samples cause reduce absorption of fluoride. Conclusion: Modified zeolite with fixed bed is an effective and economical method to remove fluoride from ground water.


S Namavar, S Naseri , Ah Mahvi , R , Nabizadeh ,
Volume 4, Issue 4 (3-2013)
Abstract

Abstract Background & objectives: One of the most important parameter in water quality is the amount of fluoride in water. Fluoride can cause bad effects on human body in high concentration. The most important of these is dental and skeletal fluorosis. According to the WHO guideline, fluoride concentration in drinking water should be limited in 1.5 mg/l. According to the recent study, in some parts of Iran fluoride concentration is more than this standard. At present time, membrane technologies have a lot of advantages therefore get improved in water industry. The aim of this study is investigation of membrane processes efficiency to product water with suitable quality of fluoride concentration in permeates. Material & Methods: In this study, the efficiency of nanofiltaration membrane (NF33, 1812-50, FILMTEC) to remove fluoride from water was investigated. The effect of some chemical (initial amount of fluoride, sulfate and electrical conductivity (EC) and the effects of associated cation with fluoride ion ) and physical (flow rate) parameters to remove fluoride were studied. Result: Obtained results showed that the fluoride removal efficiency decreased with increasing in initial amounts of fluoride, sulfate and EC in feed water and increasing in flow rate. Moreover, this efficiency for CaF2 was higher than NaF. Conclusion: Compare with standard, fluoride concentration in all samples was in standard range and fluoride removal efficiency for this membrane was over 85%.



Page 1 from 1     

© 2025 CC BY-NC 4.0 | Journal of North Khorasan University of Medical Sciences

Designed & Developed by: Yektaweb