<?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>0188-9532</journal-id>
<journal-title><![CDATA[Revista mexicana de ingeniería biomédica]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. ing. bioméd]]></abbrev-journal-title>
<issn>0188-9532</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Ingeniería Biomédica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-95322018000100041</article-id>
<article-id pub-id-type="doi">10.17488/rmib.39.1.4</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA['In Vitro' Comparison of K3XF and TFA Cyclic Fatigue Resistance in Continuous Rotation and Adaptive Motion]]></article-title>
<article-title xml:lang="es"><![CDATA[Comparación In Vitro de resistencia a la fatiga cíclica de K3XF y TFA en rotación continua y movimiento adaptativo]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carrillo-Várguez]]></surname>
<given-names><![CDATA[A.G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carrillo-Várguez]]></surname>
<given-names><![CDATA[L.H.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Vizcarra]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villarreal-Gómez]]></surname>
<given-names><![CDATA[L.J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valdez-Castro]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cadena-Alcantar]]></surname>
<given-names><![CDATA[M.A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Baja California Facultad de Odontología ]]></institution>
<addr-line><![CDATA[Tijuana ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de Baja California Escuela de Ciencias de la Ingeniería y Tecnología ]]></institution>
<addr-line><![CDATA[Tijuana ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma de Baja California Facultad de Ciencias Químicas e Ingeniería ]]></institution>
<addr-line><![CDATA[Tijuana ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Centro de Investigación y Desarrollo Tecnológico en Electroquímica S.C.  ]]></institution>
<addr-line><![CDATA[Querétaro Querétaro]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2018</year>
</pub-date>
<volume>39</volume>
<numero>1</numero>
<fpage>41</fpage>
<lpage>51</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-95322018000100041&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-95322018000100041&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-95322018000100041&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Among the most common problems within dental professionals, is the fracture of rotary instruments of nickel and titanium root canal files (NiTi), when performing a procedure on a patient. Therefore, the objective of this work is to compare the in vitro resistance to cyclic fatigue of K3XF and TFA rotatory instruments, in continuous rotation and adaptive motion. For this, a static and cyclic fracture test was used and a fracture pattern was searched. The numbers of cycles until the fracture and the length of the fragments were determined. Of all the groups evaluated, K3XF-A exhibited the best resistance to cyclic fatigue. In future research, it will be performed an autoclaving and immersion cycles in sodium hypochlorite to be able to determine the separation causes of the rotary instruments. As a recommendation, the operator could significantly influence the decrease in resistance to cyclic fatigue due to the misuse of rotary instruments.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Entre los problemas más comunes entre los profesionistas dentales, es la fractura de los instrumentos rotatorios de limas de canales radiculares de níquel y titanio (NiTi), cuando se lleva a cabo el procedimiento al paciente. Es por eso, que el objetivo de este trabajo es el comparar la resistencia in vitro de la fractura cíclica entre los instrumentos rotatorios K3XF y TFA, en rotación continua y movimiento adaptativo. Para esto, se utilizó la prueba de fractura cíclica y estática y el patrón de fractura fue evaluado. El número de ciclos hasta la fractura y la longitud de los fragmentos fue determinado. De todos los grupos evaluados, K3XF-A presentó la mejor resistencia a la fractura cíclica. Como trabajo a futuro, se utilizará ciclos de inmersión en hipoclorito de sodio y autoclaveado, para ser capaces de determinar las causas de separación de los instrumentos rotarios. Como recomendación, el operador puede influenciar significativamente la disminución de la resistencia a la fractura cíclica utilizando de una manera errónea el dispositivo.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Cyclic Fatigue]]></kwd>
<kwd lng="en"><![CDATA[K3XF and TFA rotary instruments]]></kwd>
<kwd lng="en"><![CDATA[Continuous rotation]]></kwd>
<kwd lng="en"><![CDATA[Adaptive motion]]></kwd>
<kwd lng="es"><![CDATA[Fatiga cíclica]]></kwd>
<kwd lng="es"><![CDATA[instrumentos rotatorios K3XF y TFA]]></kwd>
<kwd lng="es"><![CDATA[rotación continua]]></kwd>
<kwd lng="es"><![CDATA[movimiento adaptativo]]></kwd>
</kwd-group>
</article-meta>
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<article-title xml:lang=""><![CDATA[Cyclic Fatigue of NiTi Rotary Instruments in a Simulated Apical Abrupt Curvature]]></article-title>
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