<?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>0213-1285</journal-id>
<journal-title><![CDATA[Avances en Odontoestomatología]]></journal-title>
<abbrev-journal-title><![CDATA[Av Odontoestomatol]]></abbrev-journal-title>
<issn>0213-1285</issn>
<publisher>
<publisher-name><![CDATA[Ediciones Avances, S.L.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0213-12852017000600002</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Dinámica de polimerización enfocada a reducir o prevenir el estrés de contracción de las resinas compuestas actuales. Revisión bibliográfica]]></article-title>
<article-title xml:lang="en"><![CDATA[Dynamics of polymerization focused on reducing or preventing the stress of contraction of the current composite resins. Bibliographic review]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Moradas Estrada]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
<xref ref-type="aff" rid="A a"/>
<xref ref-type="aff" rid="A3"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Álvarez López]]></surname>
<given-names><![CDATA[B]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Oviedo Clínica Universitaria Servicio de Odontología Conservadora]]></institution>
<addr-line><![CDATA[ Asturias]]></addr-line>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Oviedo Departamento de Cirugía y Especialidades Médico Quirúrgicas Servicio de Odontología Conservadora y Materiales Odontológicos]]></institution>
<addr-line><![CDATA[ Asturias]]></addr-line>
</aff>
<aff id="Af3">
<institution><![CDATA[,Centro Estomatológico González Tuñón  ]]></institution>
<addr-line><![CDATA[Oviedo ]]></addr-line>
</aff>
<aff id="Af4">
<institution><![CDATA[,Práctica privada  ]]></institution>
<addr-line><![CDATA[Tapia de Casariego ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2017</year>
</pub-date>
<volume>33</volume>
<numero>6</numero>
<fpage>261</fpage>
<lpage>272</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S0213-12852017000600002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S0213-12852017000600002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S0213-12852017000600002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN En los últimos años, las resinas compuestas han sido mejoradas en cuanto al desgaste, estética y otras propiedades físicas. El mayor problema que persiste con las resinas compuestas es que estos materiales se contraen durante la polimerización. Contracción significa densificación o pérdida de volumen. En la cavidad dental, esta pérdida de volumen compromete la integridad de la interfase entre resina y diente, lo cual favorece la formación de grietas con el riesgo de hipersensibilidad, recidiva de caries o, incluso, fractura de la restauración. En el presente artículo, se expone la actualidad acerca del conocimiento sobre la contracción de polimerización de las resinas compuestas y su relación con el tipo de lámpara de polimerizar. Así mismo, se desarrollan los conceptos de fase obscura, expansión higroscópica, el consecuente estrés de contracción o los nuevos materiales que se presumen carentes de contracción; todo ello, en el marco de la dinámica lógica y normal llevada a cabo a la hora de realizar una obturación utilizando resinas compuestas con independencia de su relleno o partícula de éste. Respecto a las fuentes de polimerización, tanto las lámparas halógenas convencionales o las de alta densidad de potencia, como las LEDs, ofrecen un incremento gradual de la intensidad lumínica, lo que resulta muy útil para disminuir la contracción volumétrica del material.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[SUMMARY In recent years, composite resins have been improved in terms of wear, aesthetics and other physical properties. The major problem persists with composite resins is that these materials shrink during polymerization. Contraction means densification or loss of volume. In the dental cavity this loss of volume compromises the integrity of the interface between resin and tooth, which favors the formation of cracks with the risk of hypersensitivity, recurrence of caries or even fracture of the restoration. This article presents the current knowledge about the polymerization contraction knowledge of the composite resins and its relation to the type of polymerization lamp. Also the concepts of obscure phase, hygroscopic expansion, the consequent stress of contraction or the new materials that are presumed devoid of contraction are developed, all this in the frame of the logical and normal dynamics carried out at the time of making a seal using composite resins, regardless of their filler or particle thereof. Regarding the sources of polymerization, both conventional halogen lamps and high power density lamps, such as LEDs, offer a gradual increase in light intensity, which is very useful to decrease the volume shrinkage of the material.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Odontología operativa]]></kwd>
<kwd lng="es"><![CDATA[microinfiltración]]></kwd>
<kwd lng="es"><![CDATA[penetración de tinte]]></kwd>
<kwd lng="es"><![CDATA[resina de contracción de esfuerzo]]></kwd>
<kwd lng="es"><![CDATA[luz de polimerización]]></kwd>
<kwd lng="en"><![CDATA[Operative dentistry]]></kwd>
<kwd lng="en"><![CDATA[microleakage]]></kwd>
<kwd lng="en"><![CDATA[dye penetration]]></kwd>
<kwd lng="en"><![CDATA[stress contraction resin]]></kwd>
<kwd lng="en"><![CDATA[polimerization light]]></kwd>
</kwd-group>
</article-meta>
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