<?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>1646-2890</journal-id>
<journal-title><![CDATA[Revista Portuguesa de Estomatologia, Medicina Dentária e Cirurgia Maxilofacial]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Port Estomatol Med Dent Cir Maxilofac]]></abbrev-journal-title>
<issn>1646-2890</issn>
<publisher>
<publisher-name><![CDATA[Sociedade Portuguesa de Estomatologia e Medicina Dentária]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1646-28902021000300150</article-id>
<article-id pub-id-type="doi">10.24873/j.rpemd.2021.09.844</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Influence of cement type on the fracture resistance of resin nanoceramic crowns over knife-edge margins: A pilot study]]></article-title>
<article-title xml:lang="pt"><![CDATA[Influência do cimento na resistência à fratura de coroas de resina nanocerâmica sobre margens knife-edge: Estudo piloto]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guerreiro]]></surname>
<given-names><![CDATA[Joana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Dias]]></surname>
<given-names><![CDATA[Rafael]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carracho]]></surname>
<given-names><![CDATA[José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade de Lisboa Faculdade de Medicina Dentária ]]></institution>
<addr-line><![CDATA[Lisboa ]]></addr-line>
<country>Portugal</country>
</aff>
<pub-date pub-type="pub">
<day>30</day>
<month>09</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>30</day>
<month>09</month>
<year>2021</year>
</pub-date>
<volume>62</volume>
<numero>3</numero>
<fpage>150</fpage>
<lpage>156</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S1646-28902021000300150&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S1646-28902021000300150&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S1646-28902021000300150&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Objective:  To evaluate the influence of the type of cement on the fracture resistance of full-contour resin nanoceramic crowns cemented over preparations with knife-edge margins.  Methods:  A right lower premolar typodont model was prepared with a 1.5-mm axial reduction, a 2.0-mm occlusal reduction, and a knife-edge vertical margin. An anatomical crown was designed from the digital scanning of the preparation using CAD/CAM software. Then, 20 crowns were milled from resin nanoceramic CAD/CAM blocks (Cerasmart270&#8482;) as well as a replica of the dental preparation in a cobalt-chrome alloy. The 20 crowns were randomly divided into two groups. Group 1 crowns were cemented with self-adhesive resin cement (G-CEM LinkAce&#8482;) and group 2 crowns with resin-modified glass ionomer cement (FujiCEM&#8482; 2). Subsequently, they were subjected to a loading test on an Instron universal testing machine until fracture occurred. The data were statistically analyzed using the parametric Student&#8217;s t-test (&#945;=0.05).  Results:  The type of cement was shown to have a statistically significant effect on the crowns&#8217; fracture resistance (p &lt;0.001). Group 1 presented a mean of 1284.3±340.19 Newtons, much higher than the mean recorded in group 2, of 417.9±106.35 Newtons, with an increase of 207.3% in the fracture resistance after self-adhesive luting.  Conclusions:  Resin nanoceramic crowns cemented with self-adhesive resin cement showed considerably higher fracture resistance than those cemented with resin-modified glass ionomer cement.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo  Objetivo:  Avaliar a influência do tipo de cimento na resistência à fratura de coroas de recobrimento total de resina nanocerâmica cimentadas sobre preparações com margens knife-edge.  Métodos:  Um dente tipodonte pré-molar inferior direito foi preparado com uma redução axial de 1.5 mm, redução oclusal de 2.0 mm e uma margem vertical do tipo knife-edge. A partir da leitura digital da preparação, foi desenhada uma coroa anatómica em software CAD/CAM. Seguidamente, foram fresadas 20 coroas a partir de blocos CAD/CAM de resina nanocerâmica (Cerasmart270&#8482;) e uma réplica da preparação dentária em liga de crómio-cobalto. As 20 coroas foram divididas aleatoriamente em 2 grupos. No grupo 1 foram cimentadas com cimento de resina auto-adesivo (G-CEM LinkAce&#8482;) e no grupo 2 com cimento de ionómero de vidro modificado por resina (FujiCEM&#8482; 2). Posteriormente, foram sujeitas a teste de resistência numa máquina de testes universal Instron até ocorrer fratura. Os resultados obtidos foram analisados utilizando o teste paramétrico t de Student (&#945;=0.05).  Resultados:  O tipo de cimento utilizado demonstrou ter um efeito estatisticamente significativo na resistência à fratura das coroas (p&lt;0.001). O grupo 1 apresentou uma média de 1284.3±340.19 Newtons, bastante superior à média registada no grupo 2, de 417.9±106.35 Newtons, verificando-se um aumento de 207.3% da resistência à fratura.  Conclusões:  As coroas de resina nanocerâmica cimentadas com cimento de resina auto-adesivo apresentaram resistência à fratura consideravelmente maior do que as cimentadas com cimento de ionómero de vidro modificado por resina.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[CAD/CAM blocks]]></kwd>
<kwd lng="en"><![CDATA[Fracture resistance]]></kwd>
<kwd lng="en"><![CDATA[Resin-modified glass ionomer cement]]></kwd>
<kwd lng="en"><![CDATA[Resin nanoceramic]]></kwd>
<kwd lng="en"><![CDATA[Self-adhesive resin cement]]></kwd>
<kwd lng="pt"><![CDATA[Blocos de CAD/CAM]]></kwd>
<kwd lng="pt"><![CDATA[Resistência à fratura]]></kwd>
<kwd lng="pt"><![CDATA[Cimento de ionómero de vidro modificado por resina]]></kwd>
<kwd lng="pt"><![CDATA[Resina nanocerâmica]]></kwd>
<kwd lng="pt"><![CDATA[Cimento de resina auto-adesivo]]></kwd>
</kwd-group>
</article-meta>
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