<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0188-4999</journal-id>
<journal-title><![CDATA[Revista internacional de contaminación ambiental]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Int. Contam. Ambient]]></abbrev-journal-title>
<issn>0188-4999</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Ciencias de la Atmósfera y Cambio Climático]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-49992005000100017</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[FLUORIDE LEVELS IN MÉXICO CITY'S WATER SUPPLIES]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Guerrero]]></surname>
<given-names><![CDATA[Juan Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ledesma-Montes]]></surname>
<given-names><![CDATA[Constantino]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cardiel-Nieves]]></surname>
<given-names><![CDATA[Maritza]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fuente-Hernández]]></surname>
<given-names><![CDATA[Javier de la]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiménez-Farfán]]></surname>
<given-names><![CDATA[Dolores]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Odontología Laboratorio de Inmunología, División de Estudios de Posgrado e Investigación]]></institution>
<addr-line><![CDATA[D.F. ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Odontología ]]></institution>
<addr-line><![CDATA[D.F. ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2005</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2005</year>
</pub-date>
<volume>21</volume>
<numero>1</numero>
<fpage>17</fpage>
<lpage>22</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992005000100017&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992005000100017&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992005000100017&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The purpose of this study was to assess the fluoride concentration in water supplies of México City. Since Lerma-Cutzamala and Acuífero del Valle de México Water Supply Systems distribute water to the México City's Metropolitan Area (MCMA) we have analyzed their water fluoride concentration using 44 different sampling wells from the four geographical zones of the MCMA during 2002. The water sampling was monthly made during one year. All collected data showed a mean fluoride concentration of 0.70 ± 0.20 mg/L. Our results showed minor variability of fluoride concentrations in the water available in México City. The fluoride content of the different analyzed zones showed statistical differences. Although Mexican Health authorities have defined that fluoride concentration in water should be from 0.70 to 1.50 mg/L, cases of dental fluorosis have been reported in México City (Juárez-López et al. 2003). It is important to have a reliable evaluation of fluoride concentration in México City's natural water supplies prior to implementing any caries-prevention program and to avoid novel cases of dental fluorosis.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El propósito de este estudio fue conocer la concentración de fluoruros en los pozos de agua de la ciudad de México. Debido a que los sistemas Lerma-Cutzamala y Acuífero del Valle de México distribuyen el agua potable al Área Metropolitana de la ciudad de México (AMCM), se analizó la concentración de fluoruros en 44 pozos de las cuatro zonas geográficas del AMCM durante el 2002. El muestreo del agua se realizó cada mes durante un año. Los datos obtenidos mostraron un promedio de concentración de fluoruros de 0.70±0.20 mg/L. Se encontraron diferencias estadísticamente significativas entre las concentraciones de fluoruros de las diferentes zonas analizadas. A pesar de que las autoridades mexicanas del Sector Salud tienen bien definido que la concentración de fluoruro en el agua potable es entre 0.70 mg/L y 1.5 mg/L, se han reportado casos de fluorosis dental en la ciudad de México (Juárez-López et al. 2003). Es importante realizar una evaluación confiable de la concentración de fluoruros en las fuentes naturales de agua potable de la ciudad de México antes de implementar cualquier programa de prevención de caries e impedir la aparición de nuevos casos de fluorosis dental.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[caries]]></kwd>
<kwd lng="en"><![CDATA[fluoride]]></kwd>
<kwd lng="en"><![CDATA[prevention]]></kwd>
<kwd lng="en"><![CDATA[fluoridated water]]></kwd>
<kwd lng="en"><![CDATA[water supplies]]></kwd>
<kwd lng="es"><![CDATA[caries]]></kwd>
<kwd lng="es"><![CDATA[fluoruro]]></kwd>
<kwd lng="es"><![CDATA[prevención]]></kwd>
<kwd lng="es"><![CDATA[agua fluorada]]></kwd>
<kwd lng="es"><![CDATA[pozos de abastecimiento]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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