<?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>S1646-28902024000300115</article-id>
<article-id pub-id-type="doi">10.24873/j.rpemd.2024.10.1230</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Coronal preflaring&#8217;s influence on the accuracy of root canal length determination by electronicapex locators]]></article-title>
<article-title xml:lang="pt"><![CDATA[Influência do pré-alargamento cervical na determinação do comprimento radicular por localizadores foraminais eletrónicos]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Batista]]></surname>
<given-names><![CDATA[Larissa C. Novaes]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Janini]]></surname>
<given-names><![CDATA[Ana Cristina Padilha]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Marciano]]></surname>
<given-names><![CDATA[Marina A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guimarães]]></surname>
<given-names><![CDATA[Tatiany G. F. Araújo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guimarães]]></surname>
<given-names><![CDATA[Bruno Martini]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade Federal de Alfenas UNIFAL-MG ]]></institution>
<addr-line><![CDATA[Alfenas ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Faculdade de Odontologia de Piracicaba Unicamp ]]></institution>
<addr-line><![CDATA[Piracicaba ]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2024</year>
</pub-date>
<volume>65</volume>
<numero>3</numero>
<fpage>115</fpage>
<lpage>120</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S1646-28902024000300115&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S1646-28902024000300115&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S1646-28902024000300115&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Objectives:  To evaluate the influence of preflaring using LA Axxess and ProTaper Shaping files on the accuracy of Root ZX mini, Mini Apex Locator, and Propex II electronic apex locators (EALs).  Methods:  Thirty mandibular incisors were accessed, and their root canal length (RCL) was determined with the aid of a stereomicroscope. Then, the specimens were randomly assigned into two groups according to the preflaring instrument: G1- LA Axxess; G2- ProTaper Shaping files. The root canal length was determined in the alginate model by EALs before and after preflaring. Data were classified as accurate (&#8804; 0.5 mm) or inaccurate (&gt; 0.5 mm or beyond the root canal length). McNemar's test was used to detect differences in the EALs&#8217; accuracy before and after preflaring, and Cochran&#8217;s Q test was applied to detect diferences in accuracy between the EALs.  Results:  McNemar's test identified differences in precision in the Propex II and Mini Apex Locator, with significantly increased accuracy after preflaring with ProTaper files. Cochrans&#8217; Q test showed no differences between EALs&#8217; accuracy (p&gt;.05).  Conclusions:  Preflaring procedures increased accurate measurements for all the EALs, with statistical differences for Propex II and Mini Apex Locator when ProTaper instruments were used. All EALs showed similar accuracy.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo  Objetivos:  Avaliar a influência do pré-alargamento cervical usando LA axxes e limas ProTaper Shaping na precisão dos localizadores foraminais eletrónicos (EALs) Root ZX mini, Mini Apex e Propex II.  Métodos:  Trinta incisivos superiores foram acessados e tiveram seu comprimento real de trabalho determinado com o auxílio de um estereomicroscópio. Depois, as amostras foram divididas de forma randomizada entre 2 grupos de acordo com o instrumento de pré-alargamento: G1- LA Axxess; G2- ProTaper Shaping. Usando modelos de alginato, o comprimento real de trabalho foi determinado utilizando-se localizadores foraminais eletrônicos antes e depois do pré-alargamento. Os dados foram classificados como precisos (&#8804; 0,5 mm) ou imprecisos (&gt; 0,5 mm ou além do comprimento real de trabalho). O teste de McNemar foi utilizado para detectar diferenças na precisão do mesmo localizador foraminal antes e depois do pré-alargamento e o teste Q de Cochran foi aplicado para determinar a diferença de precisão entre os aparelhos.  Resultados:  o teste de McNemar identificou diferenças na precisão do Propex II e Mini Apex com um significante aumento da precisão após pré-alargamento com limas ProTaper. O teste Q de Cochran não mostrou diferenças na precisão entre os aparelhos (p&gt;0,05).  Conclusões:  Procedimentos de pré-alargamento aumentaram a precisão nas medidas em todos os localizadores foraminais, com diferença estatística no Propex II e Mini Apex quando limas ProTaper foram utilizadas. Todos os localizadores foraminais mostraram medidas similares.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Cervical preflaring]]></kwd>
<kwd lng="en"><![CDATA[Electronic apex locators]]></kwd>
<kwd lng="en"><![CDATA[Root canal preparation]]></kwd>
<kwd lng="pt"><![CDATA[Pré-alargamento cervical]]></kwd>
<kwd lng="pt"><![CDATA[Localizadores foraminais eletrônicos]]></kwd>
<kwd lng="pt"><![CDATA[Preparo do canal radicular]]></kwd>
</kwd-group>
</article-meta>
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