<?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>S1646-28902021000100001</article-id>
<article-id pub-id-type="doi">10.24873/j.rpemd.2021.01.817</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Comparison of geometric design, metallurgical features and mechanical behavior of ProTaper Gold SX and two replica-like instruments]]></article-title>
<article-title xml:lang="pt"><![CDATA[Comparação do desenho geométrico, características metalúrgicas e comportamento mecânico da lima SX da ProTaper Gold com 2 instrumentos réplica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martins]]></surname>
<given-names><![CDATA[Jorge N.R.]]></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[Silva]]></surname>
<given-names><![CDATA[Emmanuel J.N.L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Marques]]></surname>
<given-names><![CDATA[Duarte]]></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="A7"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arantes-Oliveira]]></surname>
<given-names><![CDATA[Sofia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Caramês]]></surname>
<given-names><![CDATA[João]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Versiani]]></surname>
<given-names><![CDATA[Marco Aurélio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade de Lisboa Faculdade de Medicina Dentária Department of Endodontics]]></institution>
<addr-line><![CDATA[Lisboa ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidade de Lisboa Faculdade de Medicina Dentária Unidade de Investigação em Ciências Orais e Biomédicas (UICOB)]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidade de Lisboa Faculdade de Medicina Dentária Centro de Estudo de Medicina Dentária Baseada na Evidência (CEMDBE)]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Grande Rio University (UNIGRANRIO) School of Dentistry Department of Endodontics]]></institution>
<addr-line><![CDATA[Rio de Janeiro Rio de Janeiro]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Fluminense Federal University Department of Endodontics ]]></institution>
<addr-line><![CDATA[Niteroi Rio de Janeiro]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,LIBPhys-FCT UID/FIS/04559/2013  ]]></institution>
<addr-line><![CDATA[Lisboa ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="Af7">
<institution><![CDATA[,Universidade de Lisboa Faculdade de Medicina Dentária Prosthodontics Postgraduation Department]]></institution>
<addr-line><![CDATA[Lisboa ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="Af8">
<institution><![CDATA[,Universidade de Lisboa Faculdade de Medicina Dentária ]]></institution>
<addr-line><![CDATA[Lisboa ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="Af9">
<institution><![CDATA[,Universidade de Lisboa Faculdade de Medicina Dentária Department of Oral Implantology]]></institution>
<addr-line><![CDATA[Lisboa ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="A10">
<institution><![CDATA[,Brazilian Military Police Dental Specialty Center ]]></institution>
<addr-line><![CDATA[Minas Gerais ]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>30</day>
<month>03</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>30</day>
<month>03</month>
<year>2021</year>
</pub-date>
<volume>62</volume>
<numero>1</numero>
<fpage>1</fpage>
<lpage>8</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S1646-28902021000100001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S1646-28902021000100001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S1646-28902021000100001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Objectives:  To assess the characteristics, performance, and safety of ProTaper Gold SX (PTG SX) replica-like instruments.  Methods:  A multimethod research involving the assessment of geometric design (macro and through scanning electron microscope), Ti/Ni proportions (energy-dispersive X-ray spectroscopy), phase transformation temperatures (differential scanning calorimetry), torsional resistance, and flexibility was conducted to compare two SX replica-like instruments (Premium Taper Gold and Go-Taper Flex) with the original PTG SX. Results were compared using one-way ANOVA with post hoc Tukey or Kruskal-Wallis tests according to gaussian or non-gaussian distribution (Shapiro-Wilk test). The significance level was set at 0.05.  Results:  The three SX instruments have nine cutting blades with helix angles of approximately 21o, symmetrical blade geometry without radial lands, a convex triangular cross-section design, and near equiatomic Ti/Ni atomic proportions. Design differences were observed at the tip geometry and surface finishing, which was smoother in the Premium Taper Gold and irregular in the Go-Taper Flex. Distinct R-phase start (Rs) and finish (Rf) phase transformation temperatures were noted between PTG (Rs ~48oC and Rf ~30oC), Go-Taper Flex (Rs ~43oC and Rf ~25oC), and Premium Taper Gold (Rs ~30oC and Rf ~15oC). In the mechanical tests, Go-Taper Flex presented lower maximum torque (mean 0.5 N.cm) and higher bending resistance (mean 582.2 gf) (less flexibility) than PTG (means 0.8 N.cm cliniand 447.1 gf) (P&lt;0.05). No significant differences were observed in the mechanical tests between Premium Taper Gold and PTG (P&gt;0.05).  Conclusions:  Overall, the tested replica-like systems showed different features compared to the original PTG SX instrument.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo  Objetivos:  Aferir o desenho geométrico, características metalúrgicas e desempenho mecânico dos instrumentos réplica (réplica-like) da lima SX do sistema ProTaper Gold (PTG SX).  Métodos:  A presente investigação envolveu a avaliação do desenho geométrico, proporções de Ti/Ni, temperaturas de transformação de fase, resistência a torção e flexibilidade de 2 instrumentos réplica SX (Premium Taper Gold e Go-Taper Flex) e da lima original PTG SX. Os grupos foram comparados usando os testes ANOVA unidirecional com post hoc Tukey ou Kruskal-Wallis dependendo do tipo de distribuição (gaussiana ou não-gaussiana) dos resultados (teste de Shapiro-Wilk). A significância estatística foi definida a 0,05.  Resultados:  Os 3 instrumentos SX apresentavam 9 lâminas, ângulos de hélice de ~21o, lâminas simétricas sem radial lands, desenho seccional em triângulo convexo, e proporções quase equiatómicas de Ti/Ni. Foram observadas diferenças nas pontas dos instrumentos. A analise do acabamento superficial mostrou uma superfície mais lisa na Premium Taper Gold e uma mais irregular na Go-Taper Flex. Foram observadas distintas temperaturas de transformação da fase R (Rs inicial, Rf final), entre os instrumentos PTG (Rs~48oC e Rf~30oC), Go-Taper Flex (Rs~43oC e Rf~25oC) e Premium Taper Gold (Rs~30oC e Rf~15oC). Relativamente ao desempenho mecânico, a Go-Taper Flex apresentou menor torque máximo (0,5 N.cm) e maior resistência a flexão (582,2 gf) quando comparada com a PTG (0,8 N.cm e 447,1 gf) (P&lt;0,05). Não foram identificadas diferenças entre a Premium Taper Gold e a PTG (P&gt;0,05).  Conclusões:  Na globalidade, nenhuma das réplicas foi exatamente igual ao instrumento PTG SX original.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Differential scanning calorimetry]]></kwd>
<kwd lng="en"><![CDATA[Energy dispersive x-ray spectroscopy]]></kwd>
<kwd lng="en"><![CDATA[Mechanical stress]]></kwd>
<kwd lng="en"><![CDATA[Nickel-titanium alloy]]></kwd>
<kwd lng="en"><![CDATA[Torsional force]]></kwd>
<kwd lng="pt"><![CDATA[diferencial de varrimento]]></kwd>
<kwd lng="pt"><![CDATA[Espectroscopia de raios x]]></kwd>
<kwd lng="pt"><![CDATA[Stress mecanico]]></kwd>
<kwd lng="pt"><![CDATA[Liga de niquel-titanio]]></kwd>
<kwd lng="pt"><![CDATA[Forca torsional]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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