<?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>1688-9339</journal-id>
<journal-title><![CDATA[Odontoestomatología]]></journal-title>
<abbrev-journal-title><![CDATA[Odontoestomatología]]></abbrev-journal-title>
<issn>1688-9339</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Odontología - Universidad de la República]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1688-93392022000201222</article-id>
<article-id pub-id-type="doi">10.22592/ode2022n40e222</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Efecto de la intensidad de las unidades de fotopolimerización sobre la biocompatibilidad y resistencia a la flexión de una resina compuesta]]></article-title>
<article-title xml:lang="pt"><![CDATA[Efeito da intensidade de fotopolimerização na biocompatibilidade e resistência à flexão de uma resina composta]]></article-title>
<article-title xml:lang="en"><![CDATA[Effect of the curing light intensity on the biocompatibility and flexural strength of a composite resin]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[de León]]></surname>
<given-names><![CDATA[Elisa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Teske]]></surname>
<given-names><![CDATA[Ana Paula]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[País]]></surname>
<given-names><![CDATA[Belén]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Grazioli]]></surname>
<given-names><![CDATA[Guillermo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de la República Facultad de Odontología Cátedra de Materiales Dentales]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de la República Facultad de Odontología Cátedra de Patología y Semiología buco-maxilo-facial y Clínica Estomatológica]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Práctica Privada  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Uruguay</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<volume>24</volume>
<numero>40</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_arttext&amp;pid=S1688-93392022000201222&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_abstract&amp;pid=S1688-93392022000201222&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_pdf&amp;pid=S1688-93392022000201222&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Objetivo:  Determinar el efecto de la intensidad de dos unidades de fotopolimerización sobre la biocompatibilidad, resistencia flexural y módulo elástico de una resina compuesta.  Metodología: Se crearon dos grupos de resina compuesta Filtek Z250XT cada uno fotopolimerizado con intensidades diferentes (&lt;400 mW/cm2 por 40s y &gt;800 mW/cm2 por 20s). La viabilidad celular fue analizada mediante ensayo de MTT a las 24 y 48 horas siguiendo la normativa ISO 10993-5. La resistencia flexural y módulo elástico fueron analizadas siguiendo la normativa ISO 4049.  Resultados: En el grupo fotopolimerizado con una intensidad &lt;400 mW/cm2, la citotoxicidad fue estadísticamente mayor tanto a las 24 como a las 48 horas y la resistencia flexural y módulo elástico fueron estadísticamente menores  Conclusión: Una intensidad de polimerización &lt;400 mW/cm2, aumenta los niveles de citotoxicidad y disminuye las propiedades mecánicas de las resinas compuestas. Se destaca la importancia del control periódico de las unidades de fotopolimerización.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo  Objetivo: Determinar o efeito da intensidade de duas unidades de fotopolimerização na biocompatibilidade, resistência à flexão e módulo de elasticidade de uma resina composta.  Metodologia: Foram fabricados dois grupos de resina composta Filtek Z250XT, cada um deles foi fotopolimerizado com intensidades diferentes (&lt;400 mW/cm2 por 40s e &gt; 800 mW/cm2 por 20s). A viabilidade celular foi analisada por ensaio de MTT em 24 e 48 horas seguindo a norma ISO 10993-5. A resistência à flexão e o módulo de elasticidade foram analisados &#8203;&#8203;seguindo a norma ISO 4049.  Resultados:  No grupo fotopolimerizado com intensidade &lt;400mW/cm2, a citotoxicidade foi estatisticamente maior nas 24 e 48 horas e a resistência à flexão e o módulo de elasticidade foram estatisticamente menores.  Conclusão:  Uma intensidade de polimerização &lt;400 mW/cm2 aumenta os níveis de citotoxicidade e diminui as propriedades mecânicas das resinas compostas. Destaca-se a importância do controle periódico das unidades de fotopolimerização.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Objective:  To determine the effect of the intensity of two light curing units on the biocompatibility, flexural strength and elastic modulus of a composite resin.  Methodology:  Two groups of Filtek Z250XT (3M ESPE) composite resin were created, each one photopolymerized using different intensities (&lt;400 mW/cm2 for 40s and&gt; 800 mW/cm2 for 20s). Cell viability was analyzed by MTT assay at 24 and 48 hours following the ISO 10993-5 standard. The flexural strength and elastic modulus were analyzed following the ISO 4049 standard.  Results: In the group photopolymerized with an intensity &lt;400 mW/cm2, cytotoxicity was statistically higher both at 24 and 48 hours and flexural strength and elastic modulus were statistically lower.  Conclusion:  A polymerization intensity &lt;400 mW/cm2 increases the levels of cytotoxicity and decreases the mechanical properties of composite resins. The importance of the periodic control of the light curing units is emphasized.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Ensayo de Materiales]]></kwd>
<kwd lng="es"><![CDATA[Resinas Compuestas]]></kwd>
<kwd lng="es"><![CDATA[Cultivo de Células]]></kwd>
<kwd lng="pt"><![CDATA[Teste de Materiais]]></kwd>
<kwd lng="pt"><![CDATA[Resinas Compostas]]></kwd>
<kwd lng="pt"><![CDATA[Cultura de Células]]></kwd>
<kwd lng="en"><![CDATA[materials testing]]></kwd>
<kwd lng="en"><![CDATA[composite resins]]></kwd>
<kwd lng="en"><![CDATA[cell culture]]></kwd>
</kwd-group>
</article-meta>
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