<?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>0104-5695</journal-id>
<journal-title><![CDATA[RPG. Revista de Pós-Graduação]]></journal-title>
<abbrev-journal-title><![CDATA[RPG, Rev. pós-grad.]]></abbrev-journal-title>
<issn>0104-5695</issn>
<publisher>
<publisher-name><![CDATA[Revista de Pós-Graduação da Faculdade de Odontologia da Universidade de São Paulo]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0104-56952010000300005</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[Avaliação in vitro da resistência à compressão de condicionadores de tecido submetidos a diferentes tempos de armazenamento]]></article-title>
<article-title xml:lang="en"><![CDATA[In vitro evaluation of the compressive strength of tissue conditioners submitted to different storage times]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castro]]></surname>
<given-names><![CDATA[Humberto Lago de]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barcellos]]></surname>
<given-names><![CDATA[Daphne Camara]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Silva]]></surname>
<given-names><![CDATA[Melissa Aline da]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Marocho]]></surname>
<given-names><![CDATA[Susana Maria Salazar]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nogueira Junior]]></surname>
<given-names><![CDATA[Lafayette]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidade Estadual Paulista Júlio de Mesquita Filho Faculdade de Odontologia de São José dos Campos ]]></institution>
<addr-line><![CDATA[São José dos Campos SP]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,UNESP Faculdade de Odontologia de São José dos Campos ]]></institution>
<addr-line><![CDATA[São José dos Campos SP]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,UNESP Faculdade de Odontologia de São José dos Campos ]]></institution>
<addr-line><![CDATA[São José dos Campos SP]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2010</year>
</pub-date>
<volume>17</volume>
<numero>3</numero>
<fpage>158</fpage>
<lpage>162</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://revodonto.bvsalud.org/scielo.php?script=sci_arttext&amp;pid=S0104-56952010000300005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://revodonto.bvsalud.org/scielo.php?script=sci_abstract&amp;pid=S0104-56952010000300005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://revodonto.bvsalud.org/scielo.php?script=sci_pdf&amp;pid=S0104-56952010000300005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Objetivou-se avaliar in vitro a resiliência de dois condicionadores de tecido, UG - Ufigel SC (Voco) e D - Dentusoft (DMG), depois de serem submetidos a diferentes tempos de armazenamento em água destilada a 37ºC (24 horas, 14 dias, 30 dias e 180 dias). Foram confeccionadas 20 cápsulas de resina acrílica termicamente ativada, com 20 mm de diâmetro interno e 3 mm de profundidade. Os condicionadores de tecido, UG e D, foram manipulados de acordo com o fabricante, acomodados no interior das cápsulas (n = 10) e armazenados por 24 horas, 14 dias, 30 dias e 180 dias. Cada grupo foi submetido ao teste de resiliência utilizando uma ponta romba de 3 mm de diâmetro em máquina de ensaio universal (EMIC-DL 1000). Os dados foram submetidos à análise estatística two-way ANOVA e ao teste de Tukey (&#945;= 0,05). Os valores de média para os materiais/tempo de armazenagem foram: UG/24 horas - 3,81A; D/30 dias - 5,54B; UG/14 dias - 5,58B; UG/30 dias - 5,66BC; UG/180 dias - 5,77BC; D/24 horas - 5,79BC; D/180 dias - 6,13C; D/14 dias - 6,54D. Dentusoft armazenado por 14 dias obteve valores de média de resiliência significantemente superiores em relação aos demais. Ufigel armazenado nos períodos de 1 e 14 dias apresentaram valores de resiliência menores do que D, sendo estatisticamente significante nesses períodos. Entretanto, para os períodos de avaliação de 30 e 180 dias, não se observaram diferenças significantes entre os materiais.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[This study addresses an in vitro evaluation of the resilience of two tissue conditioners, Ufigel SC (Voco) and Dentusoft (DMG), after different storage times in distilled water at 37ºC. Twenty capsules were made of acrylic resin thermally activated, with 20 mm internal diameter and 3 mm deep. The tissue conditioners Ufigel (UG) and Dentusoft (D) were manipulated according to the manufacturer, accommodated inside the capsules (n =10) and stored for 24 hours, 14 days, 30 days and 180 days. Each group was subjected to the resilience test using a blunt tip with 3 mm in diameter in a universal testing machine (EMIC DL-1000). Data were subjected to two-way ANOVA and Tukey (a = 0.05) analyses. The means for the materials/storage time were: UG/24 hours - 3.81A; D/30 days - 5.54B; UG/14 days - 5.58B; UG/30 days - 5.66BC; UG/180 days - 5.77BC; D/24 hours - 5.79BC; D/180 days - 6.13C; D/14 days - 6.54D. Dentusoft stored for 14 days obtained mean values of resilience significantly higher than the Ufigel. Ufigel storaged for and 14 days showed lower values of resilience tested, considered significant when compared to other groups tested. However, for the storage times of 30 days and 180 days, there was no significant difference between the materials tested.]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[Resinas acrílicas]]></kwd>
<kwd lng="pt"><![CDATA[Próteses e Implantes]]></kwd>
<kwd lng="pt"><![CDATA[Reembasadores de dentadura]]></kwd>
<kwd lng="en"><![CDATA[Acrylic resins]]></kwd>
<kwd lng="en"><![CDATA[Prostheses and Implants]]></kwd>
<kwd lng="en"><![CDATA[Denture liners]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><font size="2" face="Verdana"><b>ARTIGOS ORIGINAIS</b> ORIGINAL ARTICLES</font></p>     <p>&nbsp;</p>     <p><font size="4" face="Verdana"><a name="tx"></a><b>Avalia&ccedil;&atilde;o in vitro da resist&ecirc;ncia &agrave; compress&atilde;o de condicionadores de tecido submetidos a diferentes tempos de armazenamento</b></font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>In vitro evaluation of the compressive strength of tissue conditioners submitted to different storage times</b></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b>Humberto Lago de Castro<sup>I</sup>; Daphne Camara Barcellos<sup>II</sup>; Melissa Aline da Silva<sup>II</sup>; Susana Maria Salazar Marocho<sup>I</sup>; Lafayette Nogueira Junior<sup>III</sup></b></font></p>     <p> <font size="2" face="Verdana"><sup>I</sup>Aluno de P&oacute;s&#45;Gradua&ccedil;&atilde;o em Odontologia Restauradora (Doutorado), especialidade de Pr&oacute;tese Dent&aacute;ria, da Faculdade de Odontologia de S&atilde;o Jos&eacute; dos Campos da Universidade Estadual Paulista &quot;J&uacute;lio de Mesquita Filho&quot; (UNESP) – S&atilde;o Jos&eacute; dos Campos/SP    <br>   <sup>II</sup>Aluna de P&oacute;s&#45;Gradua&ccedil;&atilde;o em Odontologia Restauradora (Doutorado), especialidade de Dent&iacute;stica, da Faculdade de Odontologia de S&atilde;o Jos&eacute; dos Campos da UNESP – S&atilde;o Jos&eacute; dos Campos/SP    ]]></body>
<body><![CDATA[<br>   <sup> III</sup>Professor Titular do Departamento de Pr&oacute;tese da Faculdade de Odontologia de S&atilde;o Jos&eacute; dos Campos da UNESP – S&atilde;o Jos&eacute; dos Campos/SP</font></p>     <p><font size="2" face="Verdana"><a href="#nt">Endere&ccedil;o para correspond&ecirc;ncia</a></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p> <hr size="1" noshade>     <p><font size="2" face="Verdana"><b>RESUMO</b></font></p>     <p><font size="2" face="Verdana">Objetivou&#45;se avaliar <I>in vitro</I> a resili&ecirc;ncia de dois condicionadores de tecido, UG &#45; Ufigel SC (Voco) e D &#45; Dentusoft (DMG), depois de serem submetidos a diferentes tempos de armazenamento em &aacute;gua destilada a 37ºC (24 horas, 14 dias, 30 dias e 180 dias). Foram confeccionadas 20 c&aacute;psulas de resina acr&iacute;lica termicamente ativada, com 20 mm de di&acirc;metro interno e 3 mm de profundidade. Os condicionadores de tecido, UG e D, foram manipulados de acordo com o fabricante, acomodados no interior das c&aacute;psulas (n = 10) e armazenados por 24 horas, 14 dias, 30 dias e 180 dias. Cada grupo foi submetido ao teste de resili&ecirc;ncia utilizando uma ponta romba de 3 mm de di&acirc;metro em m&aacute;quina de ensaio universal (EMIC&#45;DL 1000). Os dados foram submetidos &agrave; an&aacute;lise estat&iacute;stica two&#45;way ANOVA e ao teste de Tukey (</font><font>&#945;</font><font size="2" face="verdana">= 0,05). Os valores de m&eacute;dia para os materiais/tempo de armazenagem foram: UG/24 horas – 3,81A; D/30 dias – 5,54B; UG/14 dias – 5,58B; UG/30 dias – 5,66BC; UG/180 dias – 5,77BC; D/24 horas – 5,79BC; D/180 dias – 6,13C; D/14 dias – 6,54D. Dentusoft armazenado por 14 dias obteve valores de m&eacute;dia de resili&ecirc;ncia significantemente superiores em rela&ccedil;&atilde;o aos demais. Ufigel armazenado nos per&iacute;odos de 1 e 14 dias apresentaram valores de resili&ecirc;ncia menores do que D, sendo estatisticamente significante nesses per&iacute;odos. Entretanto, para os per&iacute;odos de avalia&ccedil;&atilde;o de 30 e 180 dias, n&atilde;o se observaram diferen&ccedil;as significantes entre os materiais.</font></p>     <p><font size="2" face="Verdana"><b>Descritores:</b> Resinas acr&iacute;licas. Pr&oacute;teses e Implantes. Reembasadores de dentadura.</font></p> <hr size="1" noshade>     <p><font size="2" face="Verdana"><b>ABSTRACT</b></font></p>     <p><font size="2" face="Verdana">This study addresses an in vitro evaluation of the resilience of two tissue conditioners, Ufigel SC (Voco) and Dentusoft (DMG), after different storage times in distilled water at 37ºC. Twenty capsules were made of acrylic resin thermally activated, with 20 mm internal diameter and 3 mm deep. The tissue conditioners Ufigel (UG) and Dentusoft (D) were manipulated according to the manufacturer, accommodated inside the capsules (n =10) and stored for 24 hours, 14 days, 30 days and 180 days. Each group was subjected to the resilience test using a blunt tip with 3 mm in diameter in a universal testing machine (EMIC DL&#45;1000). Data were subjected to two&#45;way ANOVA and Tukey (a = 0.05) analyses. The means for the materials/storage time were: UG/24 hours – 3.81A; D/30 days – 5.54B; UG/14 days – 5.58B; UG/30 days – 5.66BC; UG/180 days – 5.77BC; D/24 hours  &#45; 5.79BC; D/180 days – 6.13C; D/14 days – 6.54D. Dentusoft stored for 14 days obtained mean values of resilience significantly higher than the Ufigel. Ufigel storaged for and 14 days showed lower values of resilience tested, considered significant when compared to other groups tested. However, for the storage times of 30 days and 180 days, there was no significant difference between the materials tested.</font></p>     <p><font size="2" face="Verdana"><b>Descriptors:</b> Acrylic resins. Prostheses and Implants. Denture liners.</font></p> <hr size="1" noshade>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>Introdu&ccedil;&atilde;o</b></font></p>     <p><font size="2" face="Verdana">Na pr&aacute;tica cl&iacute;nica os reembasadores s&atilde;o amplamente utilizados como condicionadores de tecidos, tornando&#45;os fundamentais em certos tratamentos prot&eacute;ticos<SUP>17,20</SUP>, como nos casos de irrita&ccedil;&otilde;es dos tecidos de prote&ccedil;&atilde;o da cavidade oral, no p&oacute;s&#45;operat&oacute;rio de cirurgias, reembasamento de pr&oacute;teses provis&oacute;rias durante o per&iacute;odo de osseointegra&ccedil;&atilde;o de implantes, moldagem funcional e xerostomia<SUP>16,20</SUP>.</font></p>     <p><font size="2" face="Verdana">Os reembasadores caracterizam&#45;se por suas propriedades viscoel&aacute;sticas que fazem com que o material absorva energia de impacto das for&ccedil;as mastigat&oacute;rias e a distribua uniformemente sobre os tecidos de suporte, dando conforto ao paciente<SUP>3,8,17</SUP>.</font></p>     <p><font size="2" face="Verdana">Esses materiais apresentam&#45;se comercialmente de duas formas, termo&#45; e autopolimeriz&aacute;veis, &agrave; base de resina acr&iacute;lica quimicamente ativada e &agrave; base de silicone. A primeira consiste em p&oacute; e l&iacute;quido, os quais misturados formam um gel; a segunda possui dois componentes que polimerizam por condensa&ccedil;&atilde;o<SUP>1,18</SUP>.</font></p>     <p><font size="2" face="Verdana">A longevidade desses materiais pode ser influenciada por suas caracter&iacute;sticas qu&iacute;micas, variando os n&iacute;veis de sor&ccedil;&atilde;o e solubilidade de cada material. Existem poucos relatos da correla&ccedil;&atilde;o entre as mudan&ccedil;as das propriedades mec&acirc;nicas e f&iacute;sicas ap&oacute;s o envelhecimento desses materiais. Dentre os ensaios laboratoriais que possibilitam a an&aacute;lise desse fator, encontra&#45;se a ciclagem t&eacute;rmica, respons&aacute;vel por simular a varia&ccedil;&atilde;o da temperatura existente na cavidade oral<SUP>12,15,17,20</SUP>.</font></p>     <p><font size="2" face="Verdana">Diante do exposto, fica clara a import&acirc;ncia de avaliar a resist&ecirc;ncia &agrave; compress&atilde;o de diferentes condicionadores de tecido, visto que valores de resili&ecirc;ncia mais elevados podem levar a uma distribui&ccedil;&atilde;o excessiva de carga em certos locais da cavidade oral, podendo causar desconforto ao paciente e prejudicar o tratamento reabilitador.</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>Objetivos</b></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">O objetivo deste trabalho foi avaliar <I>in vitro</I> a resist&ecirc;ncia &agrave; compress&atilde;o de dois condicionadores de tecido com propriedades qu&iacute;micas diferentes ap&oacute;s serem submetidos a diferentes tempos de armazenamento. A hip&oacute;tese nula &eacute; de que n&atilde;o haver&aacute; diferen&ccedil;a na resist&ecirc;ncia &agrave; compress&atilde;o dos materiais.</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>Material e M&eacute;todo</b></font></p>     <p><font size="2" face="Verdana">Para este estudo, foram confeccionadas 20 c&aacute;psulas de resina acr&iacute;lica ativada termicamente (Resina Acr&iacute;lica Termo Polimeriz&aacute;vel, Artigos Odontol&oacute;gicos Cl&aacute;ssico, Brasil) com as seguintes caracter&iacute;sticas: 20mm de di&acirc;metro interno e 3 mm de profundidade. As c&aacute;psulas foram divididas em 2 grupos (n = 10) e suas &aacute;reas internas foram preenchidas com dois condicionadores de tecido:</font></p> <ul>       <li>         <p><font size="2" face="Verdana">UF: Ufigel (Voco Gmbh, Alemanha) – resiliente tempor&aacute;rio &agrave; base de silicone;</font></p>   </li>       <li>         <p><font size="2" face="Verdana">D: Dentusoft (DMG Ind. Argentina, Argentina) – resiliente tempor&aacute;rio &agrave; base de resina acr&iacute;lica.</font></p>   </li>     </ul>     <p><font size="2" face="Verdana">A superf&iacute;cie interna dos cilindros de resina acr&iacute;lica foi limpa com &aacute;lcool 70% e, depois, foram preparadas segundo as instru&ccedil;&otilde;es de cada fabricante. Para o UG, foi aplicada uma camada do adesivo do sistema; j&aacute; para o D foi aplicada uma camada do l&iacute;quido do sistema (n&atilde;o possui adesivo espec&iacute;fico). Os materiais foram manipulados de acordo com as instru&ccedil;&otilde;es dos fabricantes e acomodados nas c&aacute;psulas. Utilizou&#45;se uma placa de vidro para criar uma superf&iacute;cie plana, lisa e regular.</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">Ap&oacute;s o dobro do per&iacute;odo de presa preconizado pelos fabricantes, as amostras foram armazenadas em &aacute;gua destilada a 37ºC (em estufa bacteriol&oacute;gica) e submetidas a diferentes per&iacute;odos de avalia&ccedil;&atilde;o: 24 horas, 14 dias, 30 dias e 180 dias. As amostras foram submetidas ao teste de resist&ecirc;ncia &agrave; compress&atilde;o por meio da penetra&ccedil;&atilde;o de uma ponta romba de 3 mm de di&acirc;metro na superf&iacute;cie do material, padronizando a penetra&ccedil;&atilde;o de 1 mm, em uma m&aacute;quina de ensaio universal (DL&#45;1000, EMIC, S&atilde;o Jos&eacute; dos Pinhais, PR, Brasil).</font></p>     <p><font size="2" face="Verdana">Os valores obtidos em Newton (N) foram submetidos &agrave; an&aacute;lise estat&iacute;stica ANOVA dois fatores (material e tempo de armazenamento) e Teste de Tukey (</font><font>&#945;</font><font size="2" face="verdana"> = 0,05).</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>Resultados</b></font></p>     <p><font size="2" face="Verdana">Na <a href="/img/revistas/rpg/v17n3/a05tab01.jpg">Tabela 1</a>, podemos observar ANOVA dois fatores, na qual o fator &quot;material&quot; e o fator &quot;tempo de armazenamento&quot;, bem como a intera&ccedil;&atilde;o desses fatores, resultaram em diferen&ccedil;as estatisticamente significantes.</font></p>     <p><font size="2" face="Verdana">Os resultados de acordo com o tempo de armazenamento e com o material est&atilde;o apresentados nas <a href="#tab02">Tabelas 2</a> e <a href="#tab03">3</a>, respectivamente. A intera&ccedil;&atilde;o dos fatores encontra&#45;se na <a href="/img/revistas/rpg/v17n3/a05tab04.jpg">Tabela 4</a>. Observa&#45;se que o material &agrave; base de resina acr&iacute;lica (Dentusoft) armazenado por 14 dias obteve valores m&eacute;dios de resist&ecirc;ncia &agrave; compress&atilde;o significantemente diferentes em rela&ccedil;&atilde;o aos demais. O material &agrave; base de silicone (UG) armazenado por um per&iacute;odo de 24 horas apresentou o menor valor de resist&ecirc;ncia, sendo significante quando comparado aos demais grupos.</font></p>     <p><a name="tab02"></a></p>     <p>&nbsp;</p>     <p align="center"><img src="/img/revistas/rpg/v17n3/a05tab02.jpg"></p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><a name="tab03"></a></p>     <p>&nbsp;</p>     <p align="center"><img src="/img/revistas/rpg/v17n3/a05tab03.jpg"></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana">O <a href="#grf01">Gr&aacute;fico 1</a> representa a m&eacute;dia de valores de resist&ecirc;ncia &agrave; compress&atilde;o em Newton (N) para os materiais (UG e D) nos intervalos de tempo avaliados.</font></p>     <p><a name="grf01"></a></p>     <p>&nbsp;</p>     <p align="center"><img src="/img/revistas/rpg/v17n3/a05grf01.jpg"></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>Discuss&atilde;o</b></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">Os materiais denominados <I>soft lining</I> ou resilientes s&atilde;o materiais el&aacute;sticos que preenchem total ou parcialmente a base de pr&oacute;teses, possuem a fun&ccedil;&atilde;o de absorver a energia resultante da mastiga&ccedil;&atilde;o e distribu&iacute;&#45;la sobre os tecidos de suporte, promovendo sua recupera&ccedil;&atilde;o e restaurando as condi&ccedil;&otilde;es ideais para que se possa realizar o procedimento prot&eacute;tico definitivo. Tais materiais s&atilde;o utilizados para procedimentos semipermanentes, pois se deterioram em 9&#45;18 meses<SUP>8</SUP>, e a caracter&iacute;stica resiliente do material se perde com o tempo, tornando&#45;o r&iacute;gido, e podendo causar altera&ccedil;&otilde;es teciduais indesej&aacute;veis<SUP>11</SUP>.</font></p>     <p><font size="2" face="Verdana">Segundo Eduardo<SUP>6</SUP>, a longevidade do reembasamento depende da correta manipula&ccedil;&atilde;o do material, de suas caracter&iacute;sticas intr&iacute;nsecas, da aplica&ccedil;&atilde;o do selante quando indicado, do retorno do paciente, do acompanhamento e da higieniza&ccedil;&atilde;o da pr&oacute;tese pelo paciente. Por apresentarem caracter&iacute;sticas de absor&ccedil;&atilde;o e solubilidade, esses materiais t&ecirc;m suas propriedades f&iacute;sicas alteradas, levando a altera&ccedil;&otilde;es dimensionais e distor&ccedil;&otilde;es. Para que o material forrador macio possa ter longevidade, deve apresentar baixos valores para a solubilidade e absor&ccedil;&atilde;o de &aacute;gua e, consequentemente, boa estabilidade dimensional<SUP>7</SUP>, sendo que a maioria desses materiais s&atilde;o dimensionalmente inst&aacute;veis, sofrendo absor&ccedil;&atilde;o de &aacute;gua, perda de plastificantes e altera&ccedil;&otilde;es cont&iacute;nuas durante o uso oral<SUP>2,13</SUP>.</font></p>     <p><font size="2" face="Verdana">A determina&ccedil;&atilde;o de valores de deforma&ccedil;&atilde;o permanente em materiais resilientes &eacute; importante, pois indica a sua defici&ecirc;ncia na recupera&ccedil;&atilde;o el&aacute;stica depois de serem submetidos a tens&otilde;es de compress&atilde;o. No <a href="#grf01">Gr&aacute;fico 1</a>, observa&#45;se que o material Ufigel apresentou valores de m&eacute;dia de resili&ecirc;ncia estatisticamente inferiores em rela&ccedil;&atilde;o ao Dentusoft para as avalia&ccedil;&otilde;es de 1 e 14 dias. Esses valores laboratoriais representam maior flexibilidade do material que, clinicamente, poderia ser mais tolerado pela pele e mucosas, gerando mais conforto ao paciente.</font></p>     <p><font size="2" face="Verdana">A aplica&ccedil;&atilde;o do selante de superf&iacute;cie no material Ufigel pode aumentar o per&iacute;odo de resili&ecirc;ncia e a longevidade do condicionador de tecido<SUP>5,9,20</SUP>.  Entretanto, para os per&iacute;odos de avalia&ccedil;&atilde;o de 30 e 180 dias, n&atilde;o se observaram diferen&ccedil;as estat&iacute;sticas entre os materiais Ufigel (utiliza selante de superf&iacute;cie) e Dentusoft (n&atilde;o utiliza selante de superf&iacute;cie). Contradizendo parcialmente os achados deste estudo, alguns autores sugerem que a aplica&ccedil;&atilde;o de selante sobre a superf&iacute;cie de reembasadores resilientes &eacute; ben&eacute;fica, pois aumenta sua vida &uacute;til<SUP>4,10</SUP> e reduz a perda de resili&ecirc;ncia<SUP>9,14</SUP>. Por&eacute;m, no per&iacute;odo de 180 dias, houve diferen&ccedil;a estat&iacute;stica significante (p &lt; 0,05) entre os materiais, sendo que o Ufigel apresentou valores menores de resili&ecirc;ncia, demonstrando&#45;se mais adequado.</font></p>     <p><font size="2" face="Verdana">Pode&#45;se observar tamb&eacute;m que o material Dentusoft n&atilde;o apresentou diferen&ccedil;a estat&iacute;stica quando avaliado nos per&iacute;odos de 1 dia e 180 dias. Entretanto, o material Dentusoft &eacute; um condicionador &agrave; base de resina e possui o componente pol&iacute;mero (metilmetacrilato ou etilmetacrilato). Esse pol&iacute;mero &eacute; misturado com um l&iacute;quido, contendo 60 a 80% de plastificador (&eacute;ster arom&aacute;tico dibutilftalato) e etanol. Contradizendo parcialmente os achados deste estudo, Braden<SUP>3</SUP> e Anusavice<SUP>1</SUP> afirmam que os plastificadores, que mant&ecirc;m a textura macia do mesmo, ap&oacute;s certo intervalo de tempo s&atilde;o eliminados do material, com consequente perda de peso e contra&ccedil;&atilde;o, tornado&#45;o progressivamente mais r&iacute;gido e menos resiliente.</font></p>     <p><font size="2" face="Verdana">Estudos cl&iacute;nicos que avaliem, al&eacute;m da resili&ecirc;ncia, as altera&ccedil;&otilde;es dimensionais desses materiais s&atilde;o necess&aacute;rios para uma caracteriza&ccedil;&atilde;o mais completa dos mesmos.</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>Conclus&atilde;o</b></font></p>     <p><font size="2" face="Verdana">O produto &agrave; base de silicone (Ufigel) apresentou as menores m&eacute;dias de resili&ecirc;ncia nos per&iacute;odos de 1, 14 e 180 dias, al&eacute;m de ter apresentado uma menor varialibilidade, sendo mais indicado para o reembasamento parcial ou total de pr&oacute;teses remov&iacute;veis com a fun&ccedil;&atilde;o de absorver a energia resultante da mastiga&ccedil;&atilde;o e distribu&iacute;&#45;la sobre os tecidos de suporte, promovendo sua recupera&ccedil;&atilde;o e restaurando as condi&ccedil;&otilde;es ideais para que se realize o procedimento prot&eacute;tico definitivo.</font></p>     <p>&nbsp;</p>     ]]></body>
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Pinto JRR, Mesquita MF, Henriques GEP, N&oacute;bil MAN. Effect of thermocycling on bond strenght and elasticity of 4 long&#45;term soft denture liners. J Prosthet Dent. 2002;88(5):516&#45;21.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=261263&pid=S0104-5695201000030000500018&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p><font size="2" face="Verdana">19. Yasemin Kulak&#45;Ozkan , Sertgoz A, Gedik H. Effect of thermocycling on tensile bond strength of six silicone&#45;based, resilient denture liners. J Prosthet Dent. 2003;89(3):303&#45;10.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=261265&pid=S0104-5695201000030000500019&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p><font size="2" face="Verdana">20. Zavanelli, RA, Mesquita, MF, Zavanelli AC. Reembasamento direto com material resiliente: considera&ccedil;&otilde;es e relato de caso cl&iacute;nico. PCL. 2002;4(22):503&#45;6.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=261267&pid=S0104-5695201000030000500020&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b><a name="nt"></a><a href="#tx"><img src="/img/revistas/rpg/v17n3/seta.jpg" border="0" align="baseline"></a> Endere&ccedil;o para correspond&ecirc;ncia:</b>    <br>   Humberto Lago de Castro    <BR>   Avenida Engenheiro Francisco Jos&eacute; Longo, 555, apto 1502 &#150; Jardim S&atilde;o Dimas    <BR>   CEP 12245&#45;000 &#150; S&atilde;o Jos&eacute; dos Campos/SP    <BR>   Tel.: (12) 8127&#45;6109    <BR>   E&#45;mail: <a href="mailto:lagodecastro@yahoo.com.br">lagodecastro@yahoo.com.br</a></font></p>     <p><font size="2" face="Verdana">Recebido em: 27/08/10    ]]></body>
<body><![CDATA[<BR>   Aceito em: 29/09/10</font></p>      ]]></body>
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