<?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>S0034-75072020000100009</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[La actividad antibacteriana de Camellia sinensis comparada con propóleo frente al Streptococcus mutans]]></article-title>
<article-title xml:lang="en"><![CDATA[Antibacterial activity of Camellia sinensis versus propolis against Streptococcus mutans]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cayo Rojas]]></surname>
<given-names><![CDATA[César Félix]]></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[Cervantes Ganoza]]></surname>
<given-names><![CDATA[Luis Adolfo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Inca Garcilaso de la Vega Instituto de Investigación ]]></institution>
<addr-line><![CDATA[Lima ]]></addr-line>
<country>Peru</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Inca Garcilaso de la Vega Facultad de Estomatología ]]></institution>
<addr-line><![CDATA[Lima ]]></addr-line>
<country>Peru</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Federico Villarreal Escuela Universitaria de Posgrado ]]></institution>
<addr-line><![CDATA[Lima ]]></addr-line>
<country>Peru</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2020</year>
</pub-date>
<volume>57</volume>
<numero>1</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0034-75072020000100009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0034-75072020000100009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0034-75072020000100009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Introducción: El té verde (Camellia sinensis) y el propóleo presentan flavonoides, que inhiben el crecimiento, metabolismo y la coagregación del Streptococcus mutans, principal agente causal de la caries dental.  Objetivo: Evaluar la actividad antibacteriana in vitro del extracto etanólico del té verde (Camellia sinensis) al 10 % y 20 % comparado con extracto etanólico de propóleo al 10 % y 20 %, frente al crecimiento de cepas de Streptococcus mutans (ATCC 25175).  Métodos: Estudio experimental in vitro, longitudinal, prospectivo y comparativo. El universo estuvo constituido por 90 discos de difusión y la muestra por 15 discos embebidos en té verde (Camellia sinensis) o propóleo a diferentes concentraciones, clorhexidina acuosa al 0,12 % y agua destilada. El tamaño de muestra se calculó por fórmula de comparación de medias, después de realizar un estudio piloto. Se colocaron los discos de difusión embebidos en las sustancias sobre agar Mueller Hinton, sembrado con Streptococcus mutans (ATCC 25175), haciendo medición del ancho de los halos inhibitorios a las 24 y 48 h. Se aplicaron pruebas de comparación no paramétricas de Kruskal Wallis y la prueba rangos de Wilcoxon.  Resultados: El máximo ancho de halo inhibitorio logrado por clorhexidina acuosa al 0,12 %, extracto etanólico de té verde (Camellia sinensis) al 20 % y extracto etanólico de propóleo al 20 % fue a las 24 h con valores de 10,64 mm ± 0,924 mm, 6,82 mm ± 0,982 mm y 8,36 mm ± 1,286 mm, respectivamente. El extracto etanólico de té verde (Camellia sinensis) al 20 %, presentó diferencias estadísticamente significativas respecto al extracto etanólico de propóleo al 20 %, tanto a las 24 h (p= 0,013), como a las 48 h (p= 0,011).  Conclusiones: Frente al crecimiento de cepas de Streptococcus mutans (ATCC 25175), el extracto etanólico de propóleo al 20 % presenta mayor actividad antibacteriana respecto al extracto etanólico de té verde (Camellia sinensis) al 10 % y 20 %, actividad que disminuye con el paso del tiempo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Introduction: Green tea (Camellia sinensis) and propolis contain flavonoids which inhibit the growth, metabolism and co-aggregation of Streptococcus mutans, the main causative agent of dental caries.  Objective: Evaluate the antibacterial activity in vitro of 10% and 20% green tea (Camellia sinensis) ethanolic extract versus 10% and 20% propolis ethanolic extract against the growth of Streptococcus mutans (ATCC 25175) strains.  Methods: An in vitro experimental prospective longitudinal comparative study was conducted. The study universe was 90 diffusion disks and the sample was 15 disks soaked up in green tea (Camellia sinensis) or propolis at various concentrations, 0.12% aqueous chlorhexidine and distilled water. Sample size was estimated by the comparison of means formula after conducting a pilot study. The diffusion disks soaked up in the substances were placed on Mueller Hinton agar planted with Streptococcus mutans (ATCC 25175) and the width of the inhibition haloes was measured at 24 h and 48 h. Nonparametric Kruskal-Wallis comparison tests and the Wilcoxon rank test were performed.  Results: The maximum width of the inhibition halo achieved by 0.12% aqueous chlorhexidine, 20% green tea (Camellia sinensis) ethanolic extract, and 20% propolis ethanolic extract at 24 h was 10.64 mm ± 0.924 mm, 6.82 mm ± 0.982 mm and 8.36 mm ± 1.286 mm, respectively. The 20% green tea (Camellia sinensis) ethanolic extract showed statistically significant differences with respect to the 20% propolis ethanolic extract, both at 24 h (p= 0.013) and at 48 h (p= 0.011).  Conclusions: The 20% propolis ethanolic extract displays greater antibacterial activity against the growth of Streptococcus mutans (ATCC 25175) strains than the 10% and 20% green tea (Camellia sinensis) ethanolic extract. This activity decreases with the passing of time.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Camellia sinensis (té verde)]]></kwd>
<kwd lng="es"><![CDATA[propóleo]]></kwd>
<kwd lng="es"><![CDATA[clorhexidina]]></kwd>
<kwd lng="en"><![CDATA[Camellia sinensis (green tea)]]></kwd>
<kwd lng="en"><![CDATA[propolis]]></kwd>
<kwd lng="en"><![CDATA[chlorhexidine]]></kwd>
</kwd-group>
</article-meta>
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