<?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>S0034-75072022000200002</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[¿La glicerina influye en la estabilidad del color de la resina compuesta?]]></article-title>
<article-title xml:lang="en"><![CDATA[Does glycerin influence the color stability of composite resin?]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez Fernández]]></surname>
<given-names><![CDATA[Lisandra]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Colán Guzmán]]></surname>
<given-names><![CDATA[Paola del Rosario]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valencia Heredia]]></surname>
<given-names><![CDATA[Joel Junior]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guevara Canales]]></surname>
<given-names><![CDATA[Janet Ofelia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Morales Vadillo]]></surname>
<given-names><![CDATA[Rafael]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de San Martín de Porres Facultad de Odontología Unidad de Posgrado]]></institution>
<addr-line><![CDATA[Lima ]]></addr-line>
<country>Peru</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de San Martín de Porres Facultad de Odontología Instituto de Investigación]]></institution>
<addr-line><![CDATA[Lima ]]></addr-line>
<country>Peru</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2022</year>
</pub-date>
<volume>59</volume>
<numero>2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0034-75072022000200002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0034-75072022000200002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0034-75072022000200002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Introducción: El efecto del oxígeno sobre la superficie de las resinas al momento de la fotopolimerización origina una capa que es susceptible a los pigmentos. El uso de la glicerina puede bloquear este efecto.  Objetivo: Determinar si existe diferencia en la estabilidad del color de la resina compuesta nano-híbrida sometida a un agente colorante, al aplicar o no la glicerina.  Métodos: 60 discos de resina se dividieron en Grupo 1 (sin glicerina) y Grupo 2 (con glicerina). La fotopolimerización se realizó por 20 s con la lámpara LED Bluephase®N. Se realizó la primera medición del color con el espectrofotómetro Easyshase®V y se registraron los valores arrojados para L* (luminosidad), a* (eje rojo-verde) y b* (eje azul-amarillo). Posterior a la inmersión por 1 mes de las muestras en Coca-Cola®, manteniéndolas en una incubadora a 37 ºC, se realizó la segunda medición del color. Se procesaron los datos estadísticamente con la prueba t de Student para determinar las variaciones en la estabilidad del color de ambos grupos y compararlos entre sí.  Resultados: En todos los especímenes del experimento existió alteración en la estabilidad del color de la resina. La media de la distancia entre el color inicial y el color final del Grupo 1 fue de &#916;E = 6,91, mientras en el Grupo 2 fue &#916;E = 3,74. Se halló diferencia estadísticamente significativa entre ambos grupos analizados (p &lt; 0,001).  Conclusiones: La glicerina es una sustancia efectiva para bloquear el efecto del oxígeno en la superficie de la resina y evitar la formación de la capa inhibida de oxígeno, aumentando la estabilidad del color de la resina compuesta nano-híbrida.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Introduction: The effect of oxygen on the surface of resins at the moment of photopolymerization creates a layer which is susceptible to pigments. The use of glycerin may block this effect.  Objective: Determine whether there is a difference in the color stability of nanohybrid composite resin subjected to a coloring agent when glycerin is either applied or not applied.  Methods: Sixty resin disks were distributed into Group 1 (without glycerin) and Group 2 (with glycerin). Photopolymerization was performed for 20 s with a Bluephase®N LED lamp. The first color measurement was taken with an Easyshase®V spectrophotometer, recording the values obtained for L* (luminosity), a* (red-green axis) and b* (blue-yellow axis). The second color measurement was taken after immersion of the samples for one month in Coca-Cola®, maintaining them in an incubator at 37ºC. Statistical data analysis was performed with Student's t test to determine the color stability changes occurring in the two groups and compare them.  Results: Color stability changes were observed in all the resin samples. Mean distance between initial and final color was &#916;E = 6.91 in Group 1 and &#916;E = 3.74 in Group 2. A statistically significant difference was found between the two groups analyzed (p &lt; 0.001).  Conclusions: Glycerin is an effective substance to block the effect of oxygen on the resin surface, preventing the formation of an oxygen-inhibited layer and raising the color stability of the nanohybrid composite resin.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[resina compuesta]]></kwd>
<kwd lng="es"><![CDATA[agente colorante]]></kwd>
<kwd lng="es"><![CDATA[glicerina]]></kwd>
<kwd lng="en"><![CDATA[composite resin]]></kwd>
<kwd lng="en"><![CDATA[coloring]]></kwd>
<kwd lng="en"><![CDATA[agent]]></kwd>
<kwd lng="en"><![CDATA[glycerin]]></kwd>
</kwd-group>
</article-meta>
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