<?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>S1646-28902022000200092</article-id>
<article-id pub-id-type="doi">10.24873/j.rpemd.2022.06.865</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Endodontic retreatment of mandibular canines with two roots: A report of two cases]]></article-title>
<article-title xml:lang="pt"><![CDATA[Retratamento endodôntico em caninos inferiores com duas raízes: Relato de dois casos]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Michelotto]]></surname>
<given-names><![CDATA[André Luiz da Costa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Oda]]></surname>
<given-names><![CDATA[Lisa Yurie]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Yamamoto]]></surname>
<given-names><![CDATA[Ângela Toshie Araki]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cavenago]]></surname>
<given-names><![CDATA[Bruno Cavalini]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Batista]]></surname>
<given-names><![CDATA[Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade Federal do Paraná  ]]></institution>
<addr-line><![CDATA[Curitiba ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidade Cruzeiro do Sul  ]]></institution>
<addr-line><![CDATA[São Paulo ]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>30</day>
<month>06</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>30</day>
<month>06</month>
<year>2022</year>
</pub-date>
<volume>63</volume>
<numero>2</numero>
<fpage>92</fpage>
<lpage>98</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S1646-28902022000200092&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S1646-28902022000200092&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S1646-28902022000200092&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Mandibular canines usually have one root with one root canal. However, variations may occur. The present study reports two cases of successful retreatment of two mandibular canines with two roots and two root canals, a rarer configuration. In both cases reported the unsuccessful treatment in the primary endodontic intervention was due to overlooking the lingual root canals, which were identified when periapical radiographs were taken at a mesial angle. Because canals missed during endodontic therapy may lead to periapical periodontitis, it is important to take radiographs from different angles, analyze the pulp chamber floor, and consider the variations in root canal morphologies. After performing the access cavity and observing an isthmus in both cases, the lingual root canals were located and instrumented. Calcium hydroxide dressing was used between appointments, and the root canals were filled with different sealers in each case (epoxy resin-based and bioceramic sealers). The follow-up X-rays taken 18 months later in the first case and 5 months later in the second case suggested normality of the periapical tissues. It is essential to use strategies that enable reaching the whole complexity of the root canal system during the canal cleaning, shaping, disinfection, and filling procedures in order to control the infection and achieve a successful endodontic treatment outcome.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo Os caninos inferiores geralmente possuem uma raiz com um canal radicular. No entanto, este grupo dentário pode ter variações. O presente estudo relata dois casos de retratamento endodôntico com sucesso de dois caninos inferiores com duas raízes e dois canais radiculares, uma configuração mais rara. Em ambos os casos relatados, o insucesso do tratamento na intervenção endodôntica primária foi devido à não localização do canal radicular lingual, que foi visualizado quando as radiografias periapicais foram feitas com uma angulação mesial. Canais não localizados durante o tratamento endodôntico podem levar à periodontite apical, por isso é importante realizar radiografias em diferentes angulações, avaliar o pavimento da câmara pulpar e considerar as variações da morfologia radicular. Após a realização da cavidade de acesso e observação de um istmo em ambos os casos, os canais linguais foram localizados e instrumentados. Foi utilizada medicação de hidróxido de cálcio entre as consultas e os canais foram obturados com diferentes cimentos nos casos relatados (à base de resina epóxi e biocerâmico). O acompanhamento radiográfico realizado após 18 meses no primeiro caso e 5 meses no segundo caso sugeriu normalidade dos tecidos periapicais. É essencial seguir estratégias para tratar a complexidade do sistema de canais radiculares durante a limpeza, modelagem, desinfeção e obturação do canal para controlar a infeção e alcançar um resultado bem-sucedido do tratamento endodôntico.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Anatomy]]></kwd>
<kwd lng="en"><![CDATA[Endodontics]]></kwd>
<kwd lng="en"><![CDATA[Root canal therapy]]></kwd>
<kwd lng="pt"><![CDATA[Anatomia]]></kwd>
<kwd lng="pt"><![CDATA[Endodontia]]></kwd>
<kwd lng="pt"><![CDATA[Tratamento endodôntico]]></kwd>
</kwd-group>
</article-meta>
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