<?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>0001-6365</journal-id>
<journal-title><![CDATA[Acta Odontológica Venezolana]]></journal-title>
<abbrev-journal-title><![CDATA[Acta odontol. venez]]></abbrev-journal-title>
<issn>0001-6365</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Odontología -UCV]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0001-63652008000400024</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA["Influencia de las caracteristicas estructurales de los implantes en el proceso de oseointegracion" revision de la literatura]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lamberti Vázquez]]></surname>
<given-names><![CDATA[Alberto José]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Central de Venezuela Facultad de Odontología ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Venezuela</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2008</year>
</pub-date>
<volume>46</volume>
<numero>4</numero>
<fpage>539</fpage>
<lpage>542</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_arttext&amp;pid=S0001-63652008000400024&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_abstract&amp;pid=S0001-63652008000400024&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_pdf&amp;pid=S0001-63652008000400024&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El éxito de la oseointegración de los implantes dentales endóseos depende de una técnica quirúrgica y protésica apropiada, el diseño del implante y las propiedades del material del implante. Debido a los múltiples sistemas de implantes dentales existentes en el mercado, con diferentes diseños y materiales, se dificulta la selección de un sistema de implante ideal para una situación clínica específica. Las aleaciones metálicas y los cuerpos cerámicos son los materiales más comunes utilizados para la fabricación de los implantes dentales endóseos. Existen diferentes tratamientos para modificar la topografía superficial del implante, como los recubrimientos de hidroxiapatita (HA), el arenado con partículas de óxido de aluminio (Al2O3), el rociado con plasma de titanio (T.P.S.) y el grabado ácido. La rugosidad superficial de estos recubrimientos le permiten al tejido óseo penetrar en las irregularidades superficiales y aumentar la interacción biomecánica del implante con el hueso y aumentar la cantidad de hueso alrededor del implante dental.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The success of dental implant osseointegration depends on the right surgical-prosthodontic protocol, implant design and material properties. Because of the many implant systems availables in the market with different material and designs it is difficult to choose which system is suitable for a specific clinical situation. Alloys and ceramics are the most frequent material used to fabricate dental implants. There are different treatments to modify the implant surface topography, these includes hydroxyapatite-coatings, titanium plasma-sprayed, sandblasted, and acid-ethed.The surface roughness obtained by these surface treatments promotes the penetration and growth of osseous tissue in the irregularities of the surface.The bone growth in the surface irregularities obtained by these treatments improved the implant-bone interface, and the extension of the bone around the dental implant.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Oseointegración]]></kwd>
<kwd lng="es"><![CDATA[implantes dentales endóseos]]></kwd>
<kwd lng="es"><![CDATA[topografía superficial]]></kwd>
<kwd lng="en"><![CDATA[osseointegration]]></kwd>
<kwd lng="en"><![CDATA[endosseous dental implant]]></kwd>
<kwd lng="en"><![CDATA[surface topography]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p style="text-autospace: none" align="center"><font face="Verdana"><b> &quot;Influencia de las caracteristicas estructurales de los implantes en el proceso  de oseointegracion&quot; revision de la literatura</b></font></p>     <p align="center"><font face="Verdana" size="2"><b>Alberto José Lamberti  Vázquez.</b></font></p>     <p align="justify"><font face="Verdana" size="2">Profesor Instructor a medio  Tiempo de la Cátedra de Coronas y Puentes. Facultad de Odontología. Piso 7.  Universidad Central de Venezuela. Venezuela. Tlf. 0414 1392421</font></p>     <p align="justify"><font face="Verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="Verdana" size="2">El éxito de la oseointegración  de los implantes dentales endóseos depende de una técnica quirúrgica y protésica  apropiada, el diseño del implante y las propiedades del material del implante.  Debido a los múltiples sistemas de implantes dentales existentes en el mercado,  con diferentes diseños y materiales, se dificulta la selección de un sistema de  implante ideal para una situación clínica específica. Las aleaciones metálicas y  los cuerpos cerámicos son los materiales más comunes utilizados para la  fabricación de los implantes dentales endóseos. Existen diferentes tratamientos  para modificar la topografía superficial del implante, como los recubrimientos  de hidroxiapatita (HA), el arenado con partículas de óxido de aluminio (Al<sub>2</sub>O<sub>3</sub>),  el rociado con plasma de titanio (T.P.S.) y el grabado ácido. La rugosidad  superficial de estos recubrimientos le permiten al tejido óseo penetrar en las  irregularidades superficiales y aumentar la interacción biomecánica del implante  con el hueso y aumentar la cantidad de hueso alrededor del implante dental.</font></p>     <p align="justify"><font face="Verdana" size="2"><b>Palaras claves:</b>  Oseointegración, implantes dentales endóseos, topografía superficial.</font></p>     <p align="justify"><font face="Verdana" size="2"><b>Abstract</b></font></p>     <p align="justify"><font face="Verdana" size="2">The success of dental implant  osseointegration depends on the right surgical-prosthodontic protocol, implant  design and material properties. Because of the many implant systems availables  in the market with different material and designs it is difficult to choose  which system is suitable for a specific clinical situation. Alloys and ceramics  are the most frequent material used to fabricate dental implants. There are  different treatments to modify the implant surface topography, these includes  hydroxyapatite-coatings, titanium plasma-sprayed, sandblasted, and acid-ethed.The  surface roughness obtained by these surface treatments promotes the penetration  and growth of osseous tissue in the irregularities of the surface.The bone  growth in the surface irregularities obtained by these treatments improved the  implant-bone interface, and the extension of the bone around the dental implant.</font></p>     <p align="justify"><font face="Verdana" size="2"><b>Key Words:</b>  osseointegration, endosseous dental implant, surface topography.</font></p>     <p align="justify"><font face="Verdana" size="2">Recibido para arbitraje:  06/06/2007 Aprobado para publicación: 06/08/2007</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><b><font face="Verdana" size="2">Introducción</font></b></p>     <p align="justify"><font face="Verdana" size="2">La pérdida de los  dientes y los intentos por reemplazarlos, al restaurar la función y la estética  se ha presentado como un reto a través de la historia de la humanidad.</font></p>     <p align="justify"><font face="Verdana" size="2">Desde la década de los años  cincuenta, se presentan a los implantes dentales como un método para la  rehabilitación del paciente edéntulo y a partir de allí se ha revolucionado la  práctica odontológica debido a la popularización de estos dispositivos  oseointegrados.</font></p>     <p align="justify"><font face="Verdana" size="2">Debido a la larga trayectoria  clínica del uso de los implantes oseointegrados se han presentado múltiples  revisiones y estudios donde encontramos reportes acerca de los factores que  inciden en la longevidad y por lo tanto en el éxito del tratamiento  implantosoportado. Entre estos factores encontramos las características  estructurales del implante.</font></p>     <p align="justify"><font face="Verdana" size="2"><b>Características  superficiales de los implantes dentales</b></font></p>     <p align="justify"><font face="Verdana" size="2">Debido a los múltiples sistemas  de implantes en el mercado, el odontólogo debe seleccionar, objetivamente, el  sistema que le brinde mejores resultados para lograr el objetivo final; la  fijación de los implantes al hueso a largo plazo.<sup>(1)</sup></font></p>     <p align="justify"><font face="Verdana" size="2">No todas las superficies de los  implantes se comportan de igual manera, los recubrimientos de hidroxiapatita  (HA), el arenado con partículas de óxido de aluminio (Al<sub>2</sub>O<sub>3</sub>,),  el rociado de plasma de titanio (TPS) que se aplica sobre un núcleo metálico y  el grabado ácido son métodos frecuentemente utilizados para alterar y modificar  la superficie del implante. <sup>(2)</sup></font></p>     <p align="justify"><font face="Verdana" size="2"><b>Arenado con partículas de  óxido de aluminio (Al<sub>2</sub>O<sub>3</sub>)</b></font></p>     <p align="justify"><font face="Verdana" size="2">El arenado con partículas de  diferentes diámetros es un método utilizado para alterar y modificar la  superficie del implante.</font></p>     <p align="justify"><font face="Verdana" size="2">Ésta es bombardeada con  partículas de óxido de aluminio (Al<sub>2</sub>O<sub>3</sub>) y por abrasión se  produce una superficie rugosa con fisuras y depresiones irregulares.<sup>(2)</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="Verdana" size="2"><b>Recubrimientos con  hidroxiapatita (HA)</b></font></p>     <p align="justify"><font face="Verdana" size="2">Los recubrimientos con HA de  los implantes dentales son aplicados mediante un proceso modificado de rociado<sup>(3)</sup>  y deposición de partículas de polvo de HA derretidas, que salpican y solidifican  rápidamente sobre el substrato metálico de menor temperatura.<sup>(2)</sup></font></p>     <p align="justify"><font face="Verdana" size="2">La HA es aplicada al núcleo  metálico como un recubrimiento para obtener el beneficio de las propiedades  osteoconductoras de la HA y las propiedades mecánicas de la subestructura  metálica, capaz de soportar cargas funcionales y evitar fragmentaciones.<sup>(4,  5, 6)</sup></font></p>     <p align="justify"><font face="Verdana" size="2"><b>Rociado con plasma de  titanio (T.P.S)</b></font></p>     <p align="justify"><font face="Verdana" size="2">El rociado con gotas de titanio  fundido, obtenidas al introducir hidróxido de titanio en un chorro de gas argón  a elevada temperatura, sobre un núcleo metálico para formar una capa o  recubrimiento, es otro de los métodos comunes para la modificación superficial  de los implantes. Este gas inerte se descompone en iones y electrones en un  estado que se conoce como plasma.<sup>(2)</sup></font></p>     <p align="justify"><font face="Verdana" size="2"><b>Grabado ácido:</b></font></p>     <p align="justify"><font face="Verdana" size="2">Otro método para modificar la  superficie del implante consiste en sumergir el implante metálico en una  solución ácida mixta de ácido hidroclorídrico y ácido sulfúrico (HCL-H<sub>2</sub>SO<sub>4</sub>),  la cual erosiona su superficie, creando fisuras de dimensiones y formas  específicas<sup>.(2, 7, 8)</sup></font></p>     <p align="justify"><font face="Verdana" size="2"><b>Discusión</b></font></p>     <p align="justify"><font face="Verdana" size="2">Cooper<sup>(9) </sup>plantea  que la topografía superficial del implante afecta la respuesta tisular,<sup>(10,  11)</sup> celular<sup>(12)</sup> y cantidad de hueso formado en la interfase  implante-hueso.<sup>(13)</sup></font></p>     <p align="justify"><font face="Verdana" size="2">Al incrementar la rugosidad,  mayor es el área de superficie, mayor afinidad celular a la superficie del  implante,<sup>(11, 14) </sup>mayor hueso sobre la superficie del implante,<sup>(7)</sup>  y aumento en la interacción biomecánica del implante con el hueso.<sup>(14, 15,  16)</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="Verdana" size="2">Müeller <i>et al</i>.,<sup>(17)</sup>;  Wennerberg<i> et al</i>.,<sup>(18)</sup> ; Wennernerg <i>et al</i>.<sup>(19)</sup>  reportan resultados favorables de estudios en vivo al utilizar implantes  arenados con partículas de Al<sub>2</sub>O<sub>3</sub>, mientras que Shirakura  et al.<sup>(20)</sup> reportan resultados controversiales. Kim et al.<sup>(21)</sup>  plantean que no se recomienda una rugosidad superficial arenada con un tamaño de  partícula &gt;250&#956;m. Esto puede traer consecuencias como un deterioro en la  estabilidad y capacidad de transmisión de cargas debido a la estructura  superficial menos homogénea, además del aumento en la liberación iónica<sup>(13,18,19)</sup>  por parte de la superficie del implante. Es probable que el incremento exagerado  en la rugosidad superficial sea una desventaja en la respuesta del tejido óseo.<sup>(19)</sup></font></p>     <p align="justify"><font face="Verdana" size="2">Cook <i>et al</i>.<sup>(22,23) </sup>observaron una resistencia al desalojo mayor en la interfase para los  implantes recubiertos con HA en comparación con los implantes de titanio,<sup>(4) </sup>además se observó la formación de una interfase más rígida y en menor  tiempo para los implantes recubiertos con HA. Entre las ventajas de los  implantes recubiertos con HA encontramos la rápida adaptación ósea,<sup>(3,5,6,22,23,24,25) </sup>las propiedades osteoconductoras<sup>(4,5,6,20,25,26)</sup> y la formación  de una interfase implante-hueso altamente mineralizada.<sup>(5,6,22,26)</sup></font></p>     <p align="justify"><font face="Verdana" size="2">Kohri <i>et al</i>.<sup>(5,6,27)</sup>  encontraron resultados similares de un 70% de contacto hueso-implante y  aposición directa de hueso sobre la superficie del implante recubierto con HA.  Biesbrock y Edgerton<sup>(3,26)</sup> afirman que algunas de las desventajas al  utilizar los implantes recubiertos con HA son: la integridad, fractura o colapso  del recubrimiento y la susceptibilidad a la colonización y adhesión bacteriana  debido a la rugosidad superficial de la HA. Lo que conduce a la movilidad y a la  pérdida del implante.<sup>(1,2)</sup> Estudios<sup>(4,25)</sup><i> in vitro</i>,  demuestran evidencia de resorciones de recubrimientos con HA en períodos cortos.</font></p>     <p align="justify"><font face="Verdana" size="2">Investigaciones clínicas  proponen un pronóstico similar a corto plazo para los implantes recubiertos con  HA y los implantes de titanio. Sugieren que los implantes recubiertos con HA  pueden utilizarse como modalidades de tratamiento en distintas situaciones  clínicas donde se requiera un mayor y acelerado contacto hueso-implante.<sup>(3)</sup></font></p>     <p align="justify"><font face="Verdana" size="2">Entre las ventajas de los  recubrimientos TPS tenemos la deposición directa de hueso en su superficie  gracias a la rugosidad superficial de estos recubrimientos que le permiten, al  tejido óseo mineralizado, penetrar en las microprotrusiones y microconcavidades  superficiales, facilitar la invasión de vasos sanguíneos y substancias celulares  a la superficie de la fijación. Se demostró también, la invasión de osteoblastos  y una red vascular formada entre el hueso existente y la superficie rugosa del  implante, también un porcentaje contacto hueso-implante superior<sup>(23)</sup>.  Estudios<sup>(7,14,28)</sup> en animales confirman estas observaciones.</font></p>     <p align="justify"><font face="Verdana" size="2">Wheeler<sup>(26)</sup> en un  estudio retrospectivo de los implantes recubiertos con TPS y los recubiertos con  HA, plantea que la tasa de sobrevivencia, luego de ocho años, para los implantes  TPS es de un 86,6% y para los recubiertos con HA de un 74,1%.</font></p>     <p align="justify"><font face="Verdana" size="2">Cordioli <i>et al</i>.,<sup>(7) </sup>en un estudio experimental compartivo entre implantes tratados mediante  grabado ácido, TPS, roscados y arenados. Observaron que la mayor fuerza de  torque necesaria para retirar a los implantes del hueso, correspondió a los  implantes tratados mediante grabado ácido. Ogawa et al.,<sup>(8)</sup>  demostraron valores similares para los implantes tratados con grabado ácido. Los  implantes tratados mediante grabado ácido, se observaron en contacto directo con  el hueso con valores de un 52,7<sup>(28)</sup> a un 72,4%. Claramente superior  en comparación con los otros tipos de implantes evaluados.<sup>(7,29)</sup></font></p>     <p align="justify"><font face="Verdana" size="2">Los autores<sup>(7)</sup>  atribuyen, a los implantes tratados mediante grabado ácido, un anclaje al hueso  superior y mayor porcentaje de contacto implante-hueso en comparación con los  otros tres grupos evaluados. Boyan et al. citado por Cordioli<i> et al</i>.<sup>(7)</sup>  plantean que la topografía micro-rugosa de las superficies tratadas mediante  grabado ácido, afecta favorablemente la angiogénesis, como también el  comportamiento migratorio celular, la orientación, la adhesión y finalmente la  actividad y función celular.</font></p>     <p align="justify"><font face="Verdana" size="2">Weng <i>et al</i>.<sup>(29)</sup>  y Sullivan et al.<sup>(30)</sup> han reportado niveles de éxito de un 93,7% en  sitios de pobre calidad ósea, por lo que sugieren la utilización de implantes  tratados mediante grabado ácido en áreas de hueso tipo III o tipo IV.</font></p>     <p align="justify"><font face="Verdana" size="2"><b>Conclusiones:</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="Verdana" size="2">La rugosidad superficial de  estos recubrimientos le permiten, al tejido óseo mineralizado, penetrar en las  microprotrusiones y microconcavidades superficiales. Lo cual resulta en un  anclaje al hueso superior y mayor porcentaje de contacto implantehueso.</font></p>     <p align="justify"><font face="Verdana" size="2">Mediante el proceso de grabado  ácido, pareciera lograrse el mayor incremento en el área superficial del  implante y mayor porcentaje y fuerza de unión del implante al hueso.</font></p>     <p align="justify"><font face="Verdana" size="2"><b>Referencias:</b></font></p>     <!-- ref --><p align="justify"><font face="Verdana" size="2">1. Brunski J. Biomaterials and  biomechanics in dental implant design. The International Journal of Oral &amp;  Maxillofacial Implants 1988;3:85-97.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=161892&pid=S0001-6365200800040002400001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="Verdana" size="2">2. Sykaras N, Iacopino A,  Marker V, Triplett R, Woody R. Implant materials, designs, and surface  topographies: their effect on osseointegration. A Literature review. The  International Journal of Oral &amp; Maxillofacial Implants 2000;15:675-690.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=161893&pid=S0001-6365200800040002400002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="Verdana" size="2">3. Biesbrock A, Edgerton M.  Evaluation of the clinical predictability of hidroxyapatite-coated endosseous  dental implants: A review of the literature. The International Journal of Oral &amp;  Maxillofacial Implants 1995;10:712-720.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=161894&pid=S0001-6365200800040002400003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="Verdana" size="2">4. Chang Y, Lew D, Park J,  Keller J. Biomechanical and morphometric analysis of hidroxyapatitecoated  implants with varying cristallinity. Journal of Oral and Maxillofacial Surgery  1999;57:1096-1108.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=161895&pid=S0001-6365200800040002400004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="Verdana" size="2">5. Weinlaender M, Kenney E,  Lekovic V, Beumer J, Moy P, Lewis S. Histomorphometry of Bone Apposition Around  Three Types of Endosseous Dental Implants. The International Journal of Oral &amp;  Maxillofacial Implants 1992;7:491-496.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=161896&pid=S0001-6365200800040002400005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="Verdana" size="2">6. Gottlander M, Albrektsson T,  Carlsson L. A Histomorphometric Study of Unthreaded Hydroxyapatite-Coated and  Titanium-Coated Implants in Rabbit Bone. 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