<?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>0034-7507</journal-id>
<journal-title><![CDATA[Revista Cubana de Estomatología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Cubana Estomatol]]></abbrev-journal-title>
<issn>0034-7507</issn>
<publisher>
<publisher-name><![CDATA[Editorial Ciencias Médicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-75072021000200007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Microfiltración marginal de resinas de relleno masivo y nanohíbrida en molares deciduos]]></article-title>
<article-title xml:lang="en"><![CDATA[Marginal microleakage of bulk fill and nanohybrid resins in deciduous teeth]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas-Padilla]]></surname>
<given-names><![CDATA[Sandra Vannesa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ríos-Caro]]></surname>
<given-names><![CDATA[Teresa Etelvina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Trujillo Facultad de Estomatología Departamento de Estomatología]]></institution>
<addr-line><![CDATA[Trujillo ]]></addr-line>
<country>Peru</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<volume>58</volume>
<numero>2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0034-75072021000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0034-75072021000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0034-75072021000200007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Introducción:  En la atención odontológica a niños es crucial seleccionar materiales restaurativos con buen rendimiento clínico y corto tiempo de aplicación, especialmente en pacientes con capacidad de atención limitada. Las resinas compuestas, con el mejoramiento de sus propiedades físicas y mecánicas, constituyen hoy uno de los materiales de mayor elección por el odontopediatra. Las resinas de relleno masivo son una alternativa atractiva para las restauraciones en el sector posterior.  Objetivo:  Comparar el grado de microfiltración marginal de resinas de relleno masivo y nanohíbrida en molares deciduos.  Métodos:  Estudio experimental, in vitro, en cuarenta molares deciduos; exodonciados por motivos terapéuticos, divididos en dos grupos. Grupo I: resina nanohíbrida con técnica incremental (Tetric® N Ceram - Ivoclar Vivadent) y Grupo II: resina de relleno masivo con técnica monoincremental (Tetric® N Ceram bulk fill - Ivoclar Vivadent). Se realizó un proceso de termociclado manual de 500 ciclos, entre 5 ºC ± 2 ºC y 55 ºC ± 2 ºC. Las muestras fueron sumergidas en azul de metileno al 0,5 % durante 24 horas a 37 ºC. Se analizaron con el microscopio estereoscópico de luz a 40X.  Resultados: Todas las muestras presentaron microfiltración. Con el uso de resina nanohíbrida, el 25 % presentó microfiltración leve; el 30 %, moderada; y el 45 %, severa. En el grupo de la resina de relleno masivo, el 30 % presentó microfiltración leve; el 35 %, moderada; y el 35 %, severa. No se encontró diferencia significativa entre ambos grupos (p = 0,55).  Conclusiones:  Ambas resinas, de relleno masivo y nanohíbrida, presentaron similar microfiltración marginal in vitro, en molares deciduos; por lo que la técnica de relleno masivo, por su fácil y rápida aplicación en un solo tiempo, es una buena alternativa en la rehabilitación dental odontopediátrica.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Introduction:  In children's dental care it is crucial to select restorative materials of proven clinical quality and a short application period, particularly with patients of limited attention capacity. Due to their improved physical and mechanical properties, composite resins are currently one of the materials of choice for children's dental care. Bulk fill resins are an attractive alternative for posterior restorations.  Objective:  Compare the degree of marginal microleakage of bulk fill and nanohybrid resins in deciduous teeth.  Methods:  An experimental in vitro study was conducted of 40 deciduous teeth extracted for therapeutic reasons, which were divided into two groups. Group I: nanohybrid resin by incremental technique (Tetric® N Ceram - Ivoclar Vivadent) and Group II: bulk fill resin by monoincremental technique (Tetric® N Ceram bulk fill - Ivoclar Vivadent). A manual 500-cycle thermocycling procedure was performed at 5ºC ± 2ºC to 55ºC ± 2ºC. The samples were soaked in 0.5% methylene blue at 37ºC for 24 hours and analyzed under a light stereo microscope at 40X.  Results:  Microleakage was present in all the samples. In the nanohybrid resin group, microleakage was mild in 25%, moderate in 30% and severe in 45%. In the bulk fill resin group, microleakage was mild in 30%, moderate in 35% and severe in 35%. No significant difference was found between the groups (p = 0.55).  Conclusions:  Both resins, bulk fill and nanohybrid, presented similar in vitro marginal microleakage in deciduous molars. The bulk fill technique is therefore a good alternative for children's dental rehabilitation, due to its easy and fast application in a single session.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[filtración dental]]></kwd>
<kwd lng="es"><![CDATA[resinas compuestas]]></kwd>
<kwd lng="es"><![CDATA[diente primario]]></kwd>
<kwd lng="es"><![CDATA[materiales dentales]]></kwd>
<kwd lng="en"><![CDATA[dental leakage]]></kwd>
<kwd lng="en"><![CDATA[composite resins]]></kwd>
<kwd lng="en"><![CDATA[primary tooth]]></kwd>
<kwd lng="en"><![CDATA[dental materials]]></kwd>
</kwd-group>
</article-meta>
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