<?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>0213-1285</journal-id>
<journal-title><![CDATA[Avances en Odontoestomatología]]></journal-title>
<abbrev-journal-title><![CDATA[Av Odontoestomatol]]></abbrev-journal-title>
<issn>0213-1285</issn>
<publisher>
<publisher-name><![CDATA[Ediciones Avances, S.L.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0213-12852008000100004</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Tratamiento del liquen plano oral: una revisión]]></article-title>
<article-title xml:lang="en"><![CDATA[Treatment of oral lichen planus: a review]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Pola Vallejo]]></surname>
<given-names><![CDATA[M.J.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García Martín]]></surname>
<given-names><![CDATA[J.M.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Oviedo Facultad de Medicina ]]></institution>
<addr-line><![CDATA[Oviedo ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de Oviedo Facultad de Medicina Departamento de CIrugía y Especialidades Médico Quirúrgicas]]></institution>
<addr-line><![CDATA[Oviedo ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2008</year>
</pub-date>
<volume>24</volume>
<numero>1</numero>
<fpage>45</fpage>
<lpage>53</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S0213-12852008000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S0213-12852008000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S0213-12852008000100004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El objetivo del presente estudio fue realizar una revisión sobre los actuales tratamientos del liquen plano oral (LPO). Antes de iniciar el tratamiento al paciente, debe de realizarse una biopsia para establecer el correcto diagnóstico. Dado que para el LPO no hay tratamiento curativo, el primer objetivo en los pacientes sintomáticos es el efecto paliativo. Entre las alternativas terapéuticas se incluyen: corticosteroides tópicos, sistémicos e intralesionales; retinoides tópicos o sistémicos; ciclosporina tópica, tacrolimus tópico, azatioprina, fototerapia y tratamiento quirúrgico.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The aim of the present study was to review about the current treatment of oral lichen planus (OLP). Before a patients is started on therapy a biopsy must be done to establish an accurate diagnosis. Because there is no curative therapy for OLP, the primary goal for symtomatic patients is palliative. Treatment modalities include the use of: topical, systemic and intralesional corticosteroids; topical and systemic retinoids, topical cyclosoporine; topical tacrolimus; azathioprine; phototherapy and surgical procedures.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Liquen plano]]></kwd>
<kwd lng="es"><![CDATA[tratamiento]]></kwd>
<kwd lng="es"><![CDATA[corticosteroides]]></kwd>
<kwd lng="es"><![CDATA[retinoides]]></kwd>
<kwd lng="es"><![CDATA[ciclosporina]]></kwd>
<kwd lng="es"><![CDATA[tacrolimus]]></kwd>
<kwd lng="es"><![CDATA[azatioprina]]></kwd>
<kwd lng="es"><![CDATA[fototerapia]]></kwd>
<kwd lng="en"><![CDATA[Oral lichen planus]]></kwd>
<kwd lng="en"><![CDATA[treatment]]></kwd>
<kwd lng="en"><![CDATA[corticosteroids]]></kwd>
<kwd lng="en"><![CDATA[retinoids]]></kwd>
<kwd lng="en"><![CDATA[cyclosporine]]></kwd>
<kwd lng="en"><![CDATA[tacrolimus]]></kwd>
<kwd lng="en"><![CDATA[azathioprine]]></kwd>
<kwd lng="en"><![CDATA[phototherapy]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p>&nbsp;</p>     <p><b><font size="4" face="Verdana"><a name="top"></a>Tratamiento del liquen plano oral: una revisión</font></b></p>     <p><b><font face="Verdana" size="4">Treatment</font><font face="Verdana" size="4"> of oral lichen planus: a review</font></b></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font face="Verdana"><b><font size="2">García-Pola Vallejo M.J.<sup>*</sup>, García Martín J.M.</font><sup><font size="2">**</font></sup></b></font></p>     <p><font face="Verdana"><sup><font size="2">*</font></sup><font size="2"> Prof. Titular. Facultad de Medicina. Oviedo.</font><sup><font size="2">    <br> **</font></sup><font size="2"> Colaborador de Honor. Medicina Oral. Departamento de CIrugía y Especialidades Médico Quirúrgicas. Facultad de Medicina. Oviedo.</font></font></p>      <p><font size="2" face="Verdana"><a href="#back">Dirección para correspondencia</a></font></p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>  <hr size="1">      <p><b><font size="2" face="Verdana">RESUMEN</font></b></p>     <p><font size="2" face="Verdana">El objetivo del presente estudio fue realizar una revisión sobre los actuales tratamientos del liquen plano oral (LPO). Antes de iniciar el tratamiento al paciente, debe de realizarse una biopsia para establecer el correcto diagnóstico. Dado que para el LPO no hay tratamiento curativo, el primer objetivo en los pacientes sintomáticos es el efecto paliativo. Entre las alternativas terapéuticas se incluyen: corticosteroides tópicos, sistémicos e intralesionales; retinoides tópicos o sistémicos; ciclosporina tópica, tacrolimus tópico, azatioprina, fototerapia y tratamiento quirúrgico.</font></p>     <p><font face="Verdana"><b><font size="2">Palabras clave</font></b><font size="2">: Liquen plano, tratamiento, corticosteroides, retinoides, ciclosporina, tacrolimus, azatioprina, fototerapia.</font></font></p>  <hr size="1">      <p><b><font size="2" face="Verdana">SUMMARY</font></b></p>     <p><font size="2" face="Verdana">The aim of the present study was to review about the current treatment of oral lichen planus (OLP). Before a patients is started on therapy a biopsy must be done to establish an accurate diagnosis. Because there is no curative therapy for OLP, the primary goal for symtomatic patients is palliative. Treatment modalities include the use of: topical, systemic and intralesional corticosteroids; topical and systemic retinoids, topical cyclosoporine; topical tacrolimus; azathioprine; phototherapy and surgical procedures.</font></p>     <p><font face="Verdana"><b><font size="2">Key words:</font></b><font size="2"> Oral lichen planus, treatment, corticosteroids, retinoids, cyclosporine, tacrolimus, azathioprine, phototherapy.</font></font></p>  <hr size="1">      <p>&nbsp;</p>     <p><b><font face="Verdana">Introducción</font></b></p>     <p><font size="2" face="Verdana">La indicación del tratamiento del liquen plano oral (LPO) se plantea una vez que se haya confirmado el diagnóstico de la enfermedad mediante la aplicación de criterios clínicos y estudios histopatológicos; y si fueran necesarios también inmunológicos (1, 2).</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">El enfoque terapéutico se realizará en función de los siguientes parámetros: la forma clínica; los síntomas; la localización y extensión del LPO; así como el fracaso de previos tratamientos (3).</font></p>     <p><font size="2" face="Verdana">Básicamente los objetivos del tratamiento del LPO serán: la eliminación de las lesiones atróficas y erosivas, controlar los síntomas y disminuir el potencial maligno de la lesión (4).</font></p>     <p><font size="2" face="Verdana">El primer paso a tener en cuenta es la <i>eliminación de factores locales que pudieran exacerbar la lesión</i> para, a continuación, <i>pautar el tratamiento específico del LPO</i>.</font></p>     <p>&nbsp;</p>     <p><b><font face="Verdana">Eliminación de factores que exacerban la lesión</font></p>     <p><font size="2" face="Verdana">1. Hábitos orale</font></b><font size="2" face="Verdana">s</font></p>     <p><font size="2" face="Verdana">Es importante minimizar el riesgo de desencadenar el fenómeno de Koebner, evitando hábitos como el mordisqueo labial, yugal o lingual (5). Además si es necesario, se pulirán las restauraciones desbordantes y la eliminación de las superficies anfractuosas dentarias, y se planteará la reparación o sustitución de las prótesis en mal estado (4).</font></p>      <p><font face="Verdana"><b><font size="2">2. Control de la placa denta</font></b><font size="2">l</font></font></p>     <p><font size="2" face="Verdana">La placa dental pudiera ser un factor que indujera el fenómeno de Koebner (5). Holmstrup y cols, pusieron de manifiesto la mejoría de los pacientes con LP gingival cuando se les instruía en un programa de higiene oral mantenido durante un año (6).</font></p>     <p><font size="2" face="Verdana">Se ha documentado que en los pacientes con liquen plano de localización gingival, sometidos a tratamientos gíngivo-periodontales (tartrectomías y raspados gingivales) periódicos, una o dos veces al año, estos cuidados son beneficiosos para su evolución. También resulta de utilidad, realizar enjuagues con clorhexidina al 0,2 % (sin alcohol) dos veces al día (7).</font></p>      ]]></body>
<body><![CDATA[<p><b><font size="2" face="Verdana">3. Control del estrés</font></b></p>     <p><font size="2" face="Verdana">Algunos pacientes han observado que su lesión empeora cuando están sometidos a estrés o ansiedad y que mejora al controlarlo (5).</font></p>      <p><b><font size="2" face="Verdana">4. Dieta</font></b></p>      <p><font size="2" face="Verdana">Debe aconsejarse a los pacientes mantener una dieta equilibrada y evitar la ingesta de alimentos que desencadenen dolor o exacerben las lesiones atrófico-erosivas (5).</font></p>     <p>&nbsp;</p>     <p><b><font face="Verdana">Tratamiento del LPO</font></b></p>     <p><font size="2" face="Verdana">El tratamiento del liquen plano podemos clasificarlo en tres niveles de actuación (3): I. <i>Tratamientos de aplicación tópica</i>, II. <i>Tratamientos administrados por vía sistémica</i>, y III. un tercer nivel: <i>Miscelánea</i>.</font></p>      <p><font size="2" face="Verdana">    <br> I. TRATAMIENTO TÓPICO</font></p>     <p><b><font size="2" face="Verdana">CORTICOSTEROIDES TÓPICOS</font></b></p>     ]]></body>
<body><![CDATA[<p><b><font size="2" face="Verdana">Principio activo</font></b></p>      <p><font size="2" face="Verdana">Los corticosteroides (CT) de aplicación tópica se clasifican en siete grupos (<a href="#t1">tabla 1</a>), en función de su potencia de acción, ya que un mismo principio activo al que se le modifica su concentración , se le está variando su potencia de acción (8). Con frecuencia en la literatura relacionada con la efectividad de los CT, para simplificar esta clasificación, se reduce a cuatro grupos (9): Potencia de acción baja (ej.: hidrocortisona 1%), media (ej.: acetónido de triamcinolona al 0,1%), potente (ej.: dipropionato de betametasona al 0,05%) y muy potente (ej.: propionato de clobetasol al 0,05%).</font></p>     <p align="center"><a name="t1"><img border="0" src="/img/revistas/odonto/v24n1/45tabla1.jpg" width="325" height="405"></a></p>      <p><b><font size="2" face="Verdana">    <br> Vehículo o base</font></b></p>     <p><font size="2" face="Verdana">El vehículo puede modificar la eficacia del CT, y ello representa una de las limitaciones en su aplicación sobre la mucosa oral. Sobre la piel se adhieren mejor utilizando pomadas o ungüentos, pero sobre la mucosa húmeda la mejor estabilidad de los CT se consigue mediante geles y soluciones. Entre ellos los más utilizados son el gel de Orabase y la solución acuosa (10). El Orabase es una pasta adhesiva formada por carboximetil celulosa sódica (16,7%), pectina (16,7%), gelatina (16,7%), polieno (2,5%), y parafina líquida (47,4%).</font></p>     <p><font size="2" face="Verdana">Hegarty et al (11) en un estudio comparativo de formas farmacéuticas, destacaron la predilección de los pacientes por la aplicación del CT en formato spray frente a los enjuagues.</font></p>     <p><font size="2" face="Verdana">Otros vehículos y formas farmacéuticas utilizados son: pastas dentífricas sin componentes activos (10), propilenglicol (asociado a etanol y sorbitol) (12), así como aquellos que se obtienen de variaciones galénicas a expensas de lípidos microesféricos (13).</font></p>      <p><b><font size="2" face="Verdana">    <br> Forma de aplicación</font></b></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">Los pacientes deben ser orientados respecto a la aplicación del preparado. El contacto prolongado del CT proporciona un incremento de la eficacia. Cuando la base es un gel, el paciente debe aplicar el CT con la cánula (si se dispensa con el producto) o con una torunda de algodón o bastoncillo de los oídos, y mantenerlo contra la mucosa durante al menos un minuto. El paciente no debe comer o beber en lo 30-60 minutos posteriores a la aplicación.</font></p>     <p><font size="2" face="Verdana">Cuando la afectación es gingival y/o en paladar se pueden elaborar unas cubetas con soporte dentario y cuyo diseño vendrá determinado por la extensión de la lesión (14). La aplicación de las cubetas es de 5 minutos (14) a 30 minutos (15).</font></p>     <p><font size="2" face="Verdana">Si el CT es pautado en solución, los enjuagues se realizan manteniendo el contenido durante minutos en la boca. Es necesario advertir al paciente que no trague la solución y que no coma ni beba inmediatamente, tras realizar los enjuagues.</font></p>      <p><b><font size="2" face="Verdana">    <br> Posología</font></b></p>     <p><font size="2" face="Verdana">El número de aplicaciones depende de la potencia del CT. Por tanto, aquellos CT de potencia baja o media se pautarán de 5 a 6 veces al día, mientras que los de potencia alta o muy alta se pautan 2 ó 3 veces al día. Una vez que la evolución de la sintomatología y la forma clínica sea favorable, la posología debe ser disminuida de forma progresiva. La duración del tratamiento oscila considerablemente de unos pacientes a otros.</font></p>      <p><b><font size="2" face="Verdana">    <br> Efectos adversos</font></b></p>     <p><font size="2" face="Verdana">Como comentamos previamente, los pacientes no deben tragar el medicamento residual, para evitar al máximo los efectos adversos. (15).</font></p>     <p><font size="2" face="Verdana">Cuando se utilizan los CT en forma de enjuagues la absorción sistémica es más elevada y por tanto los efectos adversos son mayores (16, 17). No se han descrito complicaciones suprarrenales (18,19), siendo el efecto secundario más frecuente la candidiasis (20-22), seguido de otros como hirsutismo, petequias y "facies de luna llena" (17). Para evitar la candidiasis post-tratamiento, está justificada la indicación de soluciones de nistatina (23).</font></p>      ]]></body>
<body><![CDATA[<p><b><font size="2" face="Verdana">    <br> CICLOSPORTINA TÓPICA</font></b></p>     <p><font size="2" face="Verdana">La ciclosporina es un fármaco inmunosupresor que se utiliza en aquellos pacientes con liquen plano gingival y/ o con afectación difusa que no responde al tratamiento con CT (3).</font></p>     <p><font size="2" face="Verdana">Se aconseja la utilización de aceite de oliva de acidez 0,4º como vehículo (24). Los pacientes deben distribuir por toda la mucosa oral, 3-5 ml de la ciclosporina durante 5 minutos, 3 veces al día. No deben comer ni beber durante los 30 minutos inmediatos después del tratamiento (3). En las formas clínicas atróficas y erosivas, después de 6-8 semanas de tratamiento, suele obtenerse un resultado favorable</font></p>     <p><font size="2" face="Verdana">La administración de la ciclosporina de forma tópica presenta una absorción sistémica baja, por lo que su efectividad no es correlativa con los niveles en sangre (25). Entre los efectos adversos que desencadena su aplicación son el mal sabor y la sensación de ardor.</font></p>     <p><font size="2" face="Verdana">El coste del tratamiento con ciclosporina es elevado, por lo que se ha intentado conseguir una dosis terapéutica con menor concentración de principio activo. La dosis de 500 mg (5 ml), obtuvo efectos beneficiosos frente a la utilización de un placebo (26).</font></p>     <p><font size="2" face="Verdana">Recientes estudios han puesto en evidencia la menor efectividad de las ciclosporinas, si se compara con la triamcinolona (27), y el clobetasol (28) de aplicación tópica para el tratamiento del LPO.</font></p>      <p><font face="Verdana"><b><font size="2">    <br> TACROLIMUS TÓPICO</font></b></font></p>     <p><font size="2" face="Verdana">El tacrolimus es un macrólido que inhibe la activación de las células T, a una concentración de 10 a 100 veces más baja que la ciclosporina. El tacrolimus se puede dispensar a una concentración del 0,1% en Orabase, una o dos veces al día (29), y del 1% (30). Para algunos patólogos orales los efectos adversos son mínimos (31), y no se ha registrado su absorción sistémica (29), sin embargo se ha descrito un caso de malignización lingual tras la aplicación de tacrolimus (32)</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">La respuesta al tratamiento es rápida pero la mayoría de los pacientes necesitan prolongar el tratamiento y pautar un tratamiento de mantenimiento para evitar las recurrencias (33, 34).</font></p>      <p><b><font size="2" face="Verdana">    <br> RETINOIDE TÓPICO</font></b></p>     <p><font size="2" face="Verdana">La aplicación tópica de retinoides ofrece una respuesta completa o parcial de la lesión entre el 71 y 94% de los pacientes, pero tras suspender el tratamiento las recidivas son frecuentes (3).</font></p>     <p><font size="2" face="Verdana">La eficacia es observada a partir de concentraciones del 0,1% del ácido retinoico (35) o retinaldehido (36), no se observa mejoría en proporciones del 0,05% (37). En un estudio comparativo de la eficacia entre el ácido retinoico al 0,05% y la fluocinolona al 0,1%, ambos aplicados tópicamente en orabase, se llegó a la conclusión de que era más eficaz el CT que el retinoide sobre los LPO erosivos (37).</font></p>     <p><font size="2" face="Verdana">Como efectos adversos se han descrito el enrojecimiento de la mucosa, y sensación de quemazón (38).</font></p>      <p><b><font size="2" face="Verdana">    <br> APLICACIÓN INTRALESIONAL</font></b></p>     <p><font size="2" face="Verdana">La aplicación del CT intralesional, se realiza directamente sobre las zonas erosivas del LPO, cuando éstas se localizan sobre mucosa no adherida, fundamentalmente en las mucosas yugales o linguales. Su aplicación puede ir precedida o no de la inyección de un anestésico, para aliviar la molestia del infiltrado.</font></p>     <p><font size="2" face="Verdana">El CT utilizado es el acetónido de triamcinolona a dosis de 10-20-40 mg/ml. Dado que su acción es "retardada", su aplicación sólo se puede repetir semanalmente (39), durante 2 ó 4 semanas (4), o mensualmente (3). No suele desencadenar efectos adversos (39).</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">    <br> II. TrATAMIENTOS SISTÉMICOS</font></p>      <p><b><font size="2" face="Verdana">CORTICOSTEROIDES SISTÉMICOS</font></b></p>     <p><font size="2" face="Verdana">Una alternativa propuesta en situaciones de exacerbación clínica del LPO, es la pauta consistente en una baja dosis de CT por vía oral durante un periodo de tiempo corto, hasta que sean efectivos los CT tópicos (5). Se utilizan dosis entre los 30-60 mg/día, una vez al día, por la mañana, durante 1 ó 3 semanas, manteniéndolo a días alternos (40). Debe recomendarse la disminución progresiva de la dosis seleccionada para evitar los efectos adversos más frecuentes como son: molestias gastrointestinales, cambios conductuales, cataratas, cara de luna, poliuria, insomnio, candidiasis, hiperglucemia, etc (41).</font></p>     <p><font size="2" face="Verdana">Algunos trabajos han puesto de manifiesto que la asociación de CT sistémicos más la aplicación tópica, no actúan de forma más eficaz que cuando éstos se pautan solos. (20, 42, 43).</font></p>     <p><font size="2" face="Verdana">En otros trabajos de investigación se constató el beneficio a largo plazo empleando pautas de asociación de CT por vía oral (a bajas dosis) con inmunomoduladores. La combinación y dosis recomendadas son: levamisol a razón de 50 mg, 3 veces al día y prednisolona 5 mg, 3 veces al día, durante 3 días seguidos a la semana (44, 45).</font></p>      <p><b><font size="2" face="Verdana">    <br> RETINOIDES SISTÉMICOS</font></b></p>     <p><font size="2" face="Verdana">Diferentes estudios han puesto de manifiesto que la utilización de isotretionina a dosis de 10-60 mg/día produce escasos efectos beneficiosos sobre el liquen plano erosivo (45, 46).</font></p>     <p><font size="2" face="Verdana">Dosis más elevadas de etretinato, 75 mg/día, durante dos meses, proporcionan una mejoría clínica de las lesiones (47), pero a largo plazo (un año), los pacientes están en la misma situación que antes de iniciar el tratamiento (48). Con estas dosis además se padecen muchos efectos adversos e incluso algunos pacientes, tienen que suspender el tratamiento (47).</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">Otra pauta propuesta es la administración de 0,6 mg/kg/día, seguido de un mantenimiento con 0,3 mg/kg/día o bien la aplicación tópica de etretionina al 0,1% en una base adhesiva dos veces al día (49). A pesar de estas consideraciones, una vez que se suspende el tratamiento el LPO recurre (50).</font></p>      <p><font size="2" face="Verdana">    <br> III. MISCELÁNEA</font></p>     <p><b><font size="2" face="Verdana">Azatioprina</font></b></p>     <p><font size="2" face="Verdana">La azatioprina es empleada para el tratamiento del liquen plano por su efecto inmunosupresor. Las dosis recomendadas son 50-100 mg/día. Puede ser aplicado en combinación con la terapia de CT para reducir la posología de éstos (40).</font></p>     <p><font size="2" face="Verdana">Los efectos adversos son muy numerosos y de diversa índole, motivo por el cual se debe extremar su pauta: Los más importantes son: náuseas, vómitos, diarrea, pancreatitis, supresión de médula ósea, hepatotoxicidad y retinopatías. Se debería utilizar con precaución en pacientes con disfunción hepática y renal, así como con problemas hematológicos (50).</font></p>     <p><font size="2" face="Verdana">La utilización con éxito de la Azatioprina de forma tópica, en gel y solución con una base de metilcelulosa, para el tratamiento de las lesiones erosivas en pacientes sometidos a trasplantes (51), abre una puerta para su aplicación en pacientes con liquen plano.</font></p>      <p><b><font size="2" face="Verdana">    <br> Fototerapia</font></b></p>     <p><font size="2" face="Verdana">Se ha utilizado para el tratamiento del LPO la aplicación de radiaciones ultravioleta de onda larga (UVA), de forma única o precedida de la administración oral o tópica de psoralenos (PUVA). El número de aplicaciones suele ser de hasta 20 (52) con intervalos de 2 a 3 días (53, 54). La administración del 8 metoxypsoraleno es a razón de 0,6 mg/kg, dos horas antes de la sesión de UVA.</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">Los efectos adversos que desencadenan los psoralenos son frecuentes, y entre ellos destacan: las náuseas, vértigo, y parálisis.</font></p>     <p><font size="2" face="Verdana">El riesgo de padecer cáncer de mucosa oral tras la aplicación de PUVA podría ser menor que cuando se aplica sobre la piel, al ofrecer ésta menor resistencia a la acción de los psoralenos.</font></p>     <p><font size="2" face="Verdana">La fotoquimioterapia extracorporal (fotoféresis) (55), es otra alternativa compleja para el tratamiento de liquen plano refractario a otras terapias. Mediante esta técnica se separan células mononucleares de la sangre del paciente, se mezclan con psoraleno y se irradian con luz ultravioleta (54).</font></p>      <p><b><font size="2" face="Verdana">    <br> Tratamiento quirúrgico</font></b></p>     <p><font size="2" face="Verdana">Entre los tratamientos quirúrgicos se incluyen la escisión, la criocirugía, la utilización de láser (56), e injertos de mucosa palatina sobre mucosa gingival (57, 58).</font></p>     <p><font size="2" face="Verdana">El láser de CO<sub>2</sub> está indicado en el liquen plano en placa (56), ya que en otras formas clínicas de LPO las recurrencias son más frecuentes (3, 59). La utilización del láser CO<sub>2</sub> presenta unas ventajas con respecto a la cirugía convencional: eliminación de lesiones extensas, visibilidad del campo operatorio sin hemorragia, postoperatorio con escasas complicaciones y reparación <i>ad integrum</i> (56).</font></p>     <p>&nbsp;</p>     <p><b><font face="Verdana">Bibliografía</font></b></p>     <!-- ref --><p><font size="2" face="Verdana">1. WHO Collaborating Centre for Oral Precancerous Lesions. Definition of leukoplakia and related lesions: an aid to studies oral precancer. Oral Surg Oral Med Oral Pathol 1978;46:518-39.</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=1229569&pid=S0213-1285200800010000400001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font size="2" face="Verdana">2. Firth NA, Rich AM, Radden RG, Reade PC. 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<body><![CDATA[<p><a href="#top"><img border="0" src="/img/revistas/odonto/v24n1/seta.gif" width="15" height="17"></a><font face="Verdana"><b><font size="2"><a name="back"></a>Dirección para correspondencia:</font></b><font size="2">    <br> </font></font><font size="2" face="Verdana">María José García-Pola Vallejo    <br> Facultad de Medicina    <br> Catedrático José Serrano, s/n    <br> 33006 Oviedo    <br> Correo electrónico: <a href="mailto:mgpola@fade.es">mgpola@fade.es</a></font></p>     <p><font size="2" face="Verdana">Fecha de recepción: Diciembre 2007.    <br> Aceptado para publicación: Diciembre 2007.</font>       ]]></body><back>
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