<?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>1984-5960</journal-id>
<journal-title><![CDATA[Innovations Implant Journal]]></journal-title>
<abbrev-journal-title><![CDATA[Innov. Implant. J., Biomater. Esthet. (Online)]]></abbrev-journal-title>
<issn>1984-5960</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Experimentos e Pesquisas Odontológicas - INEPO]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1984-59602010000100014</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[Efetividade dos mini-implantes na intrusão de molares superiores]]></article-title>
<article-title xml:lang="en"><![CDATA[Effectiveness of mini-implants on the maxillary molars intrusion]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valarelli]]></surname>
<given-names><![CDATA[Fabrício Pinelli]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Celi]]></surname>
<given-names><![CDATA[Maria Verônica Reys]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chiqueto]]></surname>
<given-names><![CDATA[Kelly Fernanda Galvão]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Freitas]]></surname>
<given-names><![CDATA[Karina Maria Salvatore de]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valarelli]]></surname>
<given-names><![CDATA[Danilo Pinelli]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Unidade de Ensino Superior Ingá  ]]></institution>
<addr-line><![CDATA[Maringá PR]]></addr-line>
<country>Brasil</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Unidade de Ensino Superior Ingá  ]]></institution>
<addr-line><![CDATA[Bauru SP]]></addr-line>
<country>Brasil</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidade de São Paulo Faculdade de Odontologia de Bauru ]]></institution>
<addr-line><![CDATA[Bauru SP]]></addr-line>
<country>Brasil</country>
</aff>
<aff id="A04">
<institution><![CDATA[,Unidade de Ensino Superior Ingá  ]]></institution>
<addr-line><![CDATA[Maringá PR]]></addr-line>
<country>Brasil</country>
</aff>
<aff id="A05">
<institution><![CDATA[,Universidade de São Paulo Faculdade de Odontologia de Bauru ]]></institution>
<addr-line><![CDATA[Bauru SP]]></addr-line>
<country>Brasil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2010</year>
</pub-date>
<volume>5</volume>
<numero>1</numero>
<fpage>66</fpage>
<lpage>71</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://revodonto.bvsalud.org/scielo.php?script=sci_arttext&amp;pid=S1984-59602010000100014&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://revodonto.bvsalud.org/scielo.php?script=sci_abstract&amp;pid=S1984-59602010000100014&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://revodonto.bvsalud.org/scielo.php?script=sci_pdf&amp;pid=S1984-59602010000100014&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Entre os pacientes adultos, é frequente a extrusão de dentes posteriores decorrente da perda do antagonista, com redução do espaço interoclusal necessário para a reabilitação protética. Nestes casos, a aplicação de mini-implantes como ancoragem esquelética para a intrusão dos molares tem sido cada vez mais comum, devido a sua variedade de benefícios, tanto para o paciente como para o ortodontista. Este trabalho apresenta um caso clínico de uma paciente de 42 anos com a extrusão do primeiro molar superior no espaço interoclusal do primeiro molar inferior direito ausente. O planejamento ortodôntico incluiu a instalação de três mini-implantes, no processo alveolar, para a intrusão do molar superior. Os mini-implantes foram inseridos entre as raízes dos dentes superiores do lado direito, sendo dois pela vestibular (um na mesial e outro na distal do primeiro molar) e outro pela palatina (entre o segundo pré-molar e o primeiro molar). Uma força intrusiva média de 150-200 g foi aplicada, e, após 4 meses, obteve-se uma intrusão de 3 mm do primeiro molar superior direito. O uso de mini-implantes foi eficaz para a intrusão de molares, tornando-se um valioso recurso para tratar a extrusão de dentes posteriores, decorrente de perdas dentárias no arco antagonista, e recuperar o espaço interoclusal necessário à reabilitação protética do paciente, sem causar movimentos recíprocos de extrusão.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Among adult patients, the extrusion of posterior teeth due to loss of antagonist is frequent, with reducing of the interocclusal space needed for prosthetic rehabilitation. In these cases, the mini-implants use as skeletal anchorage for intrusion of molars has been very common, due to its benefits variety for both the patient and the orthodontists. This report presents a case of a 42-years woman with the extrusion of the right maxillary first molar into the interocclusal space of the mandibular first molar. The orthodontic treatment included the installation of three mini-implants in the alveolar bone, in order to obtain the molar intrusion. The mini-implants were inserted between the roots of the maxillary teeth, with two mini-implants in the buccal side (mesial and distal of the first molar) and the other mini-implant in the palatal side (between the second premolar and first molar). An intrusive force averaged 150-200 g was applied, and after 4 months, an intrusion of 3 mm of maxillary right first molar was obtained. The use of mini-implants was effective at molar intrusion, making it a valuable resource to correct the extrusion of posterior teeth, due to tooth loss in the antagonist arch, and also recover the interocclusal space needed for prosthetic rehabilitation of the patient, without causing reciprocal extrusion movements.]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[Movimentação dentária]]></kwd>
<kwd lng="pt"><![CDATA[Procedimentos de ancoragem ortodôntica]]></kwd>
<kwd lng="pt"><![CDATA[Dente molar]]></kwd>
<kwd lng="en"><![CDATA[Tooth movement]]></kwd>
<kwd lng="en"><![CDATA[Orthodontic anchorage procedures]]></kwd>
<kwd lng="en"><![CDATA[Molar]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><font size="2" face="Verdana"><b>ARTIGOS CIENT&Iacute;FICOS</b></font></p>     <p>&nbsp;</p>     <p><font size="4" face="Verdana"><a name="tx"></a><B>Efetividade dos mini&#45;implantes na intrus&atilde;o de molares superiores</b></font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><B>Effectiveness of mini&#45;implants on the maxillary molars intrusion</b></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b>Fabr&iacute;cio Pinelli Valarelli<Sup>I</Sup>; Maria Ver&ocirc;nica Reys Celi<Sup>II</Sup>; Kelly Fernanda Galv&atilde;o Chiqueto<Sup>III</Sup>; Karina Maria Salvatore de Freitas<Sup>IV</Sup>; Danilo Pinelli Valarelli<sup>V</sup></b></font></p>     <p><font size="2" face="Verdana"><sup>I</sup>Doutor em Ortodontia. Coordenador do Curso de Especializa&ccedil;&atilde;o, Unidade de Ensino Superior Ing&aacute;, Maring&aacute;, PR, Brasil    <br>     <sup>II</sup>Especialista em Ortodontia, Unidade de Ensino Superior Ing&aacute;, Bauru, SP, Brasil    ]]></body>
<body><![CDATA[<br>     <sup>III</sup>Doutora em Ortodontia, Faculdade de Odontologia de Bauru, Universidade de S&atilde;o Paulo, Bauru, SP, Brasil    <br>     <sup>IV</sup>Doutora em Ortodontia e Odontologia em Sa&uacute;de Coletiva. Coordenadora do Mestrado Profissionalizante em Odontologia, &aacute;rea de concentra&ccedil;&atilde;o Ortodontia, Unidade de Ensino Superior Ing&aacute;, Maring&aacute;, PR, Brasil    <br>     <sup>V</sup>Doutorando em Ortodontia, Faculdade de Odontologia de Bauru, Universidade de S&atilde;o Paulo, Bauru, SP, Brasil</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">Entre os pacientes adultos, &eacute; frequente a extrus&atilde;o de dentes posteriores decorrente da perda do antagonista, com redu&ccedil;&atilde;o do espa&ccedil;o interoclusal necess&aacute;rio para a reabilita&ccedil;&atilde;o prot&eacute;tica. Nestes casos, a aplica&ccedil;&atilde;o de mini&#45;implantes como ancoragem esquel&eacute;tica para a intrus&atilde;o dos molares tem sido cada vez mais comum, devido a sua variedade de benef&iacute;cios, tanto para o paciente como para o ortodontista. Este trabalho apresenta um caso cl&iacute;nico de uma paciente de 42 anos com a extrus&atilde;o do primeiro molar superior no espa&ccedil;o interoclusal do primeiro molar inferior direito ausente. O planejamento ortod&ocirc;ntico incluiu a instala&ccedil;&atilde;o de tr&ecirc;s mini&#45;implantes, no processo alveolar, para a intrus&atilde;o do molar superior. Os mini&#45;implantes foram inseridos entre as ra&iacute;zes dos dentes superiores do lado direito, sendo dois pela vestibular (um na mesial e outro na distal do primeiro molar) e outro pela palatina (entre o segundo pr&eacute;&#45;molar e o primeiro molar). Uma for&ccedil;a intrusiva m&eacute;dia de 150&#45;200 g foi aplicada, e, ap&oacute;s 4 meses, obteve&#45;se uma intrus&atilde;o de 3 mm do primeiro molar superior direito. O uso de mini&#45;implantes foi eficaz para a intrus&atilde;o de molares, tornando&#45;se um valioso recurso para tratar a extrus&atilde;o de dentes posteriores, decorrente de perdas dent&aacute;rias no arco antagonista, e recuperar o espa&ccedil;o interoclusal necess&aacute;rio &agrave; reabilita&ccedil;&atilde;o prot&eacute;tica do paciente, sem causar movimentos rec&iacute;procos de extrus&atilde;o.</font></p>     <p><font size="2" face="Verdana"><b>Palavras&#45;chave: </b>Movimenta&ccedil;&atilde;o dent&aacute;ria. Procedimentos de ancoragem ortod&ocirc;ntica. Dente molar.</font></p> <hr size="1" noshade>     <p><font size="2" face="Verdana"><b>ABSTRACT</b></font></p>      ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">Among adult patients, the extrusion of posterior teeth due to loss of antagonist is frequent, with reducing of the interocclusal space needed for prosthetic rehabilitation. In these cases, the mini&#45;implants use as skeletal anchorage for intrusion of molars has been very common, due to its benefits variety for both the patient and the orthodontists. This report presents a case of a 42&#45;years woman with the extrusion of the right maxillary first molar into the interocclusal space of the mandibular first molar. The orthodontic treatment included the installation of three mini&#45;implants in the alveolar bone, in order to obtain the molar intrusion. The mini&#45;implants were inserted between the roots of the maxillary teeth, with two mini&#45;implants in the buccal side (mesial and distal of the first molar) and the other mini&#45;implant in the palatal side (between the second premolar and first molar). An intrusive force averaged 150&#45;200 g was applied, and after 4 months, an intrusion of 3 mm of maxillary right first molar was obtained. The use of mini&#45;implants was effective at molar intrusion, making it a valuable resource to correct the extrusion of posterior teeth, due to tooth loss in the antagonist arch, and also recover the interocclusal space needed for prosthetic rehabilitation of the patient, without causing reciprocal extrusion movements.</font></p>     <p><font size="2" face="Verdana"><b>Key words:</b> Tooth movement. Orthodontic anchorage procedures. Molar.</font></p> <hr size="1" noshade>     <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">Atualmente, o numero de pacientes adultos que procura o tratamento ortod&ocirc;ntico tem aumentado consideravelmente<SUP>6,18</SUP>. Dentre os fatores que contribuem para esse aumento est&atilde;o: a grande evolu&ccedil;&atilde;o sofrida pelas t&eacute;cnicas ortod&ocirc;nticas e, simultaneamente, pelos materiais ortod&ocirc;nticos, a maior aceita&ccedil;&atilde;o social pela utiliza&ccedil;&atilde;o do aparelho, o conceito de beleza seguindo os padr&otilde;es americanos e a redu&ccedil;&atilde;o dos custos para o paciente na utiliza&ccedil;&atilde;o do aparelho<SUP>6,11</SUP>. Esses pacientes apresentam caracter&iacute;sticas peculiares em suas m&aacute;s oclus&otilde;es, que dificultam a mec&acirc;nica ortod&ocirc;ntica e por diversas vezes comprometem o sucesso do tratamento<SUP>7,15</SUP>.</font></p>     <p><font size="2" face="Verdana">Uma caracter&iacute;stica frequentemente encontrada em pacientes adultos que se submetem ao tratamento ortod&ocirc;ntico s&atilde;o as mutila&ccedil;&otilde;es e perdas dos molares inferiores<SUP>12</SUP>. Como consequ&ecirc;ncia da falta de dentes na regi&atilde;o p&oacute;stero&#45;inferior, &eacute; comum a extrus&atilde;o dos molares e pr&eacute;&#45;molares superiores. Al&eacute;m de proporcionar um problema est&eacute;tico para o paciente, este efeito dificulta a reabilita&ccedil;&atilde;o prot&eacute;tica dos dentes perdidos, pois o espa&ccedil;o interoclusal para a reconstru&ccedil;&atilde;o da coroa se torna insuficiente<SUP>12</SUP>.</font></p>     <p><font size="2" face="Verdana">Para restabelecer o espa&ccedil;o vertical adequado na regi&atilde;o, alguns procedimentos s&atilde;o sugeridos conforme cada caso: impac&ccedil;&atilde;o dent&aacute;ria cir&uacute;rgica, redu&ccedil;&atilde;o da coroa do dente extru&iacute;do por desgaste oclusal e aux&iacute;lio prot&eacute;tico ou a intrus&atilde;o ortod&ocirc;ntica do dente em quest&atilde;o<SUP>13,26</SUP>.</font></p>     <p><font size="2" face="Verdana">Dentre estas op&ccedil;&otilde;es, a intrus&atilde;o ortod&ocirc;ntica representa o procedimento menos invasivo, pois a impac&ccedil;&atilde;o cir&uacute;rgica possui os riscos inerentes &agrave; cirurgia, e a redu&ccedil;&atilde;o da coroa por desgastes oclusais, em diversas ocasi&otilde;es, exige o tratamento endod&ocirc;ntico do dente extru&iacute;do e posterior reabilita&ccedil;&atilde;o com coroa prot&eacute;tica<SUP>26</SUP>.</font></p>     <p><font size="2" face="Verdana">Apesar de ser um procedimento menos invasivo, a intrus&atilde;o dent&aacute;ria &eacute; um dos movimentos ortod&ocirc;nticos mais dif&iacute;ceis de realizar em pacientes adultos<SUP>10</SUP>, principalmente na regi&atilde;o posterior, devido ao maior volume radicular dos molares e pr&eacute;&#45;molares. O desafio &eacute; obter um movimento intrusivo puro, sem os efeitos extrusivos dos dentes de ancoragem<SUP>20,25</SUP>. No entanto, com o desenvolvimento de novos instrumentos e dispositivos na Ortodontia, os profissionais possuem mais um mecanismo para vencer este desafio: a ancoragem esquel&eacute;tica<SUP>3</SUP>.</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">Este tipo de ancoragem permite movimentos dent&aacute;rios com uma mec&acirc;nica menos complexa, sem os efeitos rec&iacute;procos indesej&aacute;veis, sem a depend&ecirc;ncia do paciente e, portanto, mais previs&iacute;veis<SUP>27</SUP>. Para se obter a ancoragem esquel&eacute;tica, &eacute; poss&iacute;vel utilizar os mini&#45;implantes ou as mini&#45;placas de tit&acirc;nio, inseridos na maxila ou mand&iacute;bula. Os mini&#45;implantes apresentam diversas vantagens, sendo dispositivos pequenos e vers&aacute;teis, com f&aacute;cil instala&ccedil;&atilde;o e remo&ccedil;&atilde;o<SUP>9,22</SUP>. A mini&#45;placa tamb&eacute;m &eacute; muito efetiva, por&eacute;m requer uma cirurgia mais complexa e invasiva para sua inser&ccedil;&atilde;o, se comparada aos mini&#45;implantes<SUP>27</SUP>.</font></p>     <p><font size="2" face="Verdana">Neste trabalho, ser&aacute; apresentado um caso cl&iacute;nico em que foram utilizados mini&#45;implantes para a intrus&atilde;o do molar superior extru&iacute;do devido &agrave; falta do dente antagonista.</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>RELATO DE CASO</b></font></p>     <p><font size="2" face="Verdana">Uma paciente de 42 anos, do g&ecirc;nero feminino, necessitava de uma reabilita&ccedil;&atilde;o prot&eacute;tica na regi&atilde;o posterior da mand&iacute;bula, bilateralmente (<a href="#fig1">Figura 1</a>). Por&eacute;m, no lado direito havia um impedimento, causado pela extrus&atilde;o do primeiro molar superior em dire&ccedil;&atilde;o ao espa&ccedil;o do primeiro molar inferior (<a href="#fig1">Figura 1A</a>). Por isso, a paciente foi encaminhada ao tratamento ortod&ocirc;ntico para a realiza&ccedil;&atilde;o do movimento intrusivo do primeiro molar superior direito.</font></p>     <p><a name="fig1"></a></p>     <p>&nbsp;</p>     <p align="center"><img src="/img/revistas/iij/v5n1/a14fig01.jpg"></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana">A condi&ccedil;&atilde;o periodontal deste dente apresentava&#45;se normal. O planejamento ortod&ocirc;ntico consistia em intruir o primeiro molar superior direito com o aux&iacute;lio de tr&ecirc;s mini&#45;implantes de 1,6 mm de di&acirc;metro e 9 mm de comprimento (Neodent, Curitiba, PR, Brasil). Ap&oacute;s a instala&ccedil;&atilde;o do aparelho ortod&ocirc;ntico fixo, dois mini&#45;implantes foram instalados no processo alveolar vestibular, sendo um inserido na mesial e outro na distal do dente primeiro molar superior direito. O terceiro mini&#45;implante foi inserido na face palatina do processo alveolar, entre as ra&iacute;zes do segundo pr&eacute;&#45;molar e do primeiro molar (<a href="#fig2">Figura 2</a>). Uma carga imediata entre 150 g e 200 g foi aplicada por meio de el&aacute;sticos correntes ligando os mini&#45;implantes at&eacute; o tubo ou o bot&atilde;o lingual, soldados na banda do primeiro molar.</font></p>     ]]></body>
<body><![CDATA[<p><a name="fig2"></a></p>     <p>&nbsp;</p>     <p align="center"><img src="/img/revistas/iij/v5n1/a14fig02.jpg"></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana">Ap&oacute;s dois meses, a intrus&atilde;o obtida foi significante, com um posicionamento mais nivelado do primeiro molar. Depois de quatro meses, obteve&#45;se a quantidade de intrus&atilde;o desejada. No sexto m&ecirc;s, os segundos molares foram inclu&iacute;dos no arco, e uma for&ccedil;a muito suave foi mantida apenas como conten&ccedil;&atilde;o do posicionamento vertical do molar, enquanto o tratamento ortod&ocirc;ntico prosseguia at&eacute; o fio retangular (0,019" x 0,025") de a&ccedil;o, como mostra a <a href="#fig3">Figura 3</a>.</font></p>     <p><a name="fig3"></a></p>     <p>&nbsp;</p>     <p align="center"><img src="/img/revistas/iij/v5n1/a14fig03.jpg"></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana">Com o segundo molar superior inclu&iacute;do no arco retangular, foi poss&iacute;vel estabilizar o primeiro molar at&eacute; o t&eacute;rmino do tratamento ortod&ocirc;ntico, enquanto a paciente aguardava a confec&ccedil;&atilde;o da pr&oacute;tese do primeiro molar inferior (<a href="#fig4">Figura 4</a>).</font></p>     ]]></body>
<body><![CDATA[<p><a name="fig4"></a></p>     <p>&nbsp;</p>     <p align="center"><img src="/img/revistas/iij/v5n1/a14fig04.jpg"></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana">Nas radiografias, pode&#45;se observar o desnivelamento do primeiro molar superior em rela&ccedil;&atilde;o ao segundo molar, ao in&iacute;cio do tratamento ortod&ocirc;ntico. Na radiografia tomada ap&oacute;s 12 meses de tratamento, &eacute; poss&iacute;vel visualizar a quantidade de intrus&atilde;o ocorrida no primeiro molar superior, sem efeitos indesej&aacute;veis nos dentes adjacentes. Na <a href="#fig5">Figura 5</a>, a linha amarela encontra&#45;se no n&iacute;vel dos &aacute;pices radiculares do segundo e primeiro molares e do segundo pr&eacute;&#45;molar, antes da intrus&atilde;o. Com a for&ccedil;a intrusiva ancorada nos mini&#45;implantes, observa&#45;se que, ap&oacute;s a intrus&atilde;o, apenas o &aacute;pice do primeiro molar superior passou da linha amarela, enquanto que os outros dentes mantiveram suas posi&ccedil;&otilde;es verticais, durante o tratamento ortod&ocirc;ntico.</font></p>     <p><a name="fig5"></a></p>     <p>&nbsp;</p>     <p align="center"><img src="/img/revistas/iij/v5n1/a14fig05.jpg"></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana">As telerradiografias tomadas antes e ap&oacute;s a intrus&atilde;o foram utilizadas para o c&aacute;lculo da quantidade de intrus&atilde;o obtida nesta mec&acirc;nica com mini&#45;implantes (<a href="#fig6">Figura 6</a>). Com a sobreposi&ccedil;&atilde;o dos tra&ccedil;ados no plano palatino, pode&#45;se verificar que o primeiro molar sofreu uma intrus&atilde;o de 3 mm, como mostra a <a href="#fig7">Figura 7</a>. Para calcular este valor, mediu&#45;se a menor dist&acirc;ncia do plano palatino at&eacute; o ponto central da coroa do primeiro molar superior direito (ponto m&eacute;dio da linha que passa pela maior converg&ecirc;ncia mesial e distal da coroa dent&aacute;ria).</font></p>     ]]></body>
<body><![CDATA[<p><a name="fig6"></a></p>     <p>&nbsp;</p>     <p align="center"><img src="/img/revistas/iij/v5n1/a14fig06.jpg"></p>     <p>&nbsp;</p>     <p><a name="fig7"></a></p>     <p>&nbsp;</p>     <p align="center"><img src="/img/revistas/iij/v5n1/a14fig07.jpg"></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>DISCUSS&Atilde;O</b></font></p>     <p><font size="2" face="Verdana">No intuito de eliminar as consequ&ecirc;ncias desfavor&aacute;veis na unidade de ancoragem, os mini&#45;implantes surgiram como coadjuvantes no tratamento ortod&ocirc;ntico possibilitando uma ancoragem esquel&eacute;tica para a obten&ccedil;&atilde;o de muitos movimentos dent&aacute;rios<SUP>1,3</SUP>. Devido a sua praticidade e efetividade, o uso dos mini&#45;implantes para a intrus&atilde;o de molares tem sido cada vez mais frequente na Ortodontia<SUP>1,2,12,25</SUP>. Al&eacute;m disso, sabe&#45;se que a intrus&atilde;o dos molares obtida por meio de m&eacute;todos convencionais, sem o uso dos mini&#45;implantes, apresenta pouca signific&acirc;ncia cl&iacute;nica, quantificando apenas 0,96 mm de real intrus&atilde;o<SUP>14</SUP>.</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">Em geral, a intrus&atilde;o &eacute; necess&aacute;ria em adultos que apresentam extrus&atilde;o de molares e pr&eacute;&#45;molares devido &agrave; perda dos dentes antagonistas. Esta extrus&atilde;o dificulta a reabilita&ccedil;&atilde;o prot&eacute;tica do paciente e ainda pode causar defeitos periodontais e interfer&ecirc;ncias oclusais durante os movimentos funcionais<SUP>26</SUP>. A intrus&atilde;o posterior realizada com a ancoragem esquel&eacute;tica tamb&eacute;m tem sido aplicada em casos com excesso vertical posterior para o tratamento da mordida aberta anterior<SUP>2,19,23</SUP>.</font></p>     <p><font size="2" face="Verdana">A ancoragem esquel&eacute;tica utilizada neste caso cl&iacute;nico permitiu uma quantidade significante de intrus&atilde;o do primeiro molar superior. Com a aplica&ccedil;&atilde;o da for&ccedil;a diretamente nos mini&#45;implantes, foi poss&iacute;vel realizar movimentos dent&aacute;rios sem prejudicar o posicionamento dos outros dentes que atuariam como ancoragem.</font></p>     <p><font size="2" face="Verdana">A biomec&acirc;nica da intrus&atilde;o deve ser bem controlada para evitar que o dente sofra inclina&ccedil;&atilde;o vestibular ou lingual. Em geral, nos casos de intrus&atilde;o posterior, deseja&#45;se um movimento de corpo dos dentes. Para isso, a for&ccedil;a deve ser aplicada bilateralmente, por vestibular e por lingual<SUP>1</SUP>. Neste caso cl&iacute;nico, optou&#45;se por dois mini&#45;implantes vestibulares e um lingual, com uso de el&aacute;stico corrente fixado diretamente nos acess&oacute;rios soldados na banda. Assim, pode&#45;se obter um controle tridimensional melhor da movimenta&ccedil;&atilde;o. Al&eacute;m disso, evitou&#45;se passar o el&aacute;stico sobre a superf&iacute;cie oclusal do molar, ligando um mini&#45;implante vestibular ao lingual, pois poderia haver o risco do deslocamento do el&aacute;stico para mesial ou distal, inclinando a coroa<SUP>1</SUP>.</font></p>     <p><font size="2" face="Verdana">O local de inser&ccedil;&atilde;o dos mini&#45;implantes deve ser considerado durante o planejamento. Algumas vezes, n&atilde;o &eacute; poss&iacute;vel inserir no local ideal, comprometendo a biomec&acirc;nica do movimento. Pacientes adultos podem apresentar falta de espa&ccedil;o suficiente entre as ra&iacute;zes, pouca quantidade de gengiva inserida e problemas periodontais que tornam a inser&ccedil;&atilde;o dos mini&#45;implantes mais dif&iacute;cil<SUP>6</SUP> e, portanto, as mini&#45;placas podem ser uma op&ccedil;&atilde;o vi&aacute;vel nestes casos.</font></p>     <p><font size="2" face="Verdana">A resposta biol&oacute;gica dent&aacute;ria durante um movimento intrusivo apresenta muitas controv&eacute;rsias<SUP>8,24</SUP>, principalmente com rela&ccedil;&atilde;o &agrave; reabsor&ccedil;&atilde;o radicular<SUP>2,4,5,16</SUP>. Neste caso cl&iacute;nico, a resposta biol&oacute;gica do molar e das estruturas &oacute;sseas adjacentes &agrave; intrus&atilde;o mostrou&#45;se normal e aceit&aacute;vel. A sa&uacute;de periodontal e a vitalidade do molar foram mantidas durante todo o tratamento e a reabsor&ccedil;&atilde;o radicular foi m&iacute;nima, provavelmente devido &agrave; aplica&ccedil;&atilde;o de uma for&ccedil;a controlada entre 150 g e 200 g<SUP>1,10,25,26</SUP>.</font></p>     <p><font size="2" face="Verdana">Park e colaboradores utilizaram uma for&ccedil;a intrusiva de 200 a 300 g nos molares superiores e obtiveram uma intrus&atilde;o de 0,5 a 1,0 mm por m&ecirc;s, sem a presen&ccedil;a de reabsor&ccedil;&atilde;o significante ou problemas com a vitalidade desses dentes<SUP>17</SUP>.</font></p>     <p><font size="2" face="Verdana">O tempo de quatro meses para a obten&ccedil;&atilde;o da intrus&atilde;o desejada com ancoragem esquel&eacute;tica foi considerado normal em rela&ccedil;&atilde;o aos resultados de outros trabalhos<SUP>12</SUP>, que tamb&eacute;m obtiveram uma intrus&atilde;o de 3 mm ap&oacute;s cinco meses<SUP>10,26</SUP> , e em outra situa&ccedil;&atilde;o foi obtida uma intrus&atilde;o de 6 mm durante cinco meses utilizando mini&#45;placas<SUP>27</SUP>.</font></p>     <p><font size="2" face="Verdana">Considerando a possibilidade de recidiva do movimento intrusivo, encontrou&#45;se uma recidiva de 27,2% dos primeiros molares e 30,3% dos segundos molares, ap&oacute;s o tratamento da mordida aberta com a intrus&atilde;o dos dentes posteriores<SUP>21</SUP>. Por isso, &eacute; recomend&aacute;vel que se fa&ccedil;a uma conten&ccedil;&atilde;o diferenciada ou a sobrecorre&ccedil;&atilde;o da quantidade de intrus&atilde;o dos molares.</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>CONCLUS&Atilde;O</b></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">O uso de mini&#45;implantes foi eficaz para a intrus&atilde;o de molares, tornando&#45;se um valioso recurso para tratar a extrus&atilde;o de dentes posteriores, decorrente de perdas dent&aacute;rias no arco antagonista, e recuperar o espa&ccedil;o interoclusal necess&aacute;rio &agrave; reabilita&ccedil;&atilde;o prot&eacute;tica do paciente, sem causar movimentos rec&iacute;procos de extrus&atilde;o.</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>REFERÊNCIAS</b></font></p>     <!-- ref --><p><font size="2" face="Verdana">1. Ara&uacute;jo TM, Nascimento MHA, Franco FCM, Bittencourt MAV. Intrus&atilde;o dent&aacute;ria utilizando mini&#45;implantes. 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Rev Dental Press Ortodon Ortop Facial. 2005;10(4):97&#45;105.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=087295&pid=S1984-5960201000010001400027&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"><a name="nt"></a><a href="#tx"><img src="/img/revistas/iij/v5n1/seta.jpg" border="0"></a> <B>Endere&ccedil;o para correspond&ecirc;ncia:</B>    ]]></body>
<body><![CDATA[<br>Kelly Chiqueto    <br>    Rua Padre Jo&atilde;o, 14&#45;68 &#150; Apto. 201    <br>    17012&#45;020 &#150; Bauru &#150; S&atilde;o Paulo &#45; Brasil    <br> E&#45;mail: <a href="mailto:kellychiqueto@yahoo.com.br">kellychiqueto@yahoo.com.br</a> </font></p>     <p><font size="2" face="Verdana">Recebido: 26/11/2009    <br>   Aceito: 08/04/2010</font></p>      ]]></body>
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