<?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>1646-2890</journal-id>
<journal-title><![CDATA[Revista Portuguesa de Estomatologia, Medicina Dentária e Cirurgia Maxilofacial]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Port Estomatol Med Dent Cir Maxilofac]]></abbrev-journal-title>
<issn>1646-2890</issn>
<publisher>
<publisher-name><![CDATA[Sociedade Portuguesa de Estomatologia e Medicina Dentária]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1646-28902021000100009</article-id>
<article-id pub-id-type="doi">10.24873/j.rpemd.2021.03.822</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Influence of implant design, length, diameter, and anatomic region on implant stability: a randomized clinical trial]]></article-title>
<article-title xml:lang="pt"><![CDATA[Influência do comprimento, diâmetro e desenho do implante e da região anatómica na estabilidade implantar: ensaio clínico randomizado]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Moreira]]></surname>
<given-names><![CDATA[André]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
<xref ref-type="aff" rid="A a"/>
<xref ref-type="aff" rid="A3"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rosa]]></surname>
<given-names><![CDATA[José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Freitas]]></surname>
<given-names><![CDATA[Filipe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
<xref ref-type="aff" rid="A a"/>
<xref ref-type="aff" rid="A4"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Francisco]]></surname>
<given-names><![CDATA[Helena]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Luís]]></surname>
<given-names><![CDATA[Henrique]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Caramês]]></surname>
<given-names><![CDATA[João]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Faculdade de Medicina Dentária da Universidade de Lisboa Specialization in Implantology ]]></institution>
<addr-line><![CDATA[Lisbon ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Faculdade de Medicina Dentária da Universidade de Lisboa Department of Oral Surgery and Implant Dentistry ]]></institution>
<addr-line><![CDATA[Lisbon ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Faculdade de Medicina Dentária da Universidade de Lisboa Department of Biostatistics ]]></institution>
<addr-line><![CDATA[Lisbon ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Implantology Institute  ]]></institution>
<addr-line><![CDATA[Lisbon ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Polytechnic of Leiria Center for Innovative Care and Health Technology ]]></institution>
<addr-line><![CDATA[Leiria ]]></addr-line>
<country>Portugal</country>
</aff>
<pub-date pub-type="pub">
<day>30</day>
<month>03</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>30</day>
<month>03</month>
<year>2021</year>
</pub-date>
<volume>62</volume>
<numero>1</numero>
<fpage>9</fpage>
<lpage>15</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S1646-28902021000100009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S1646-28902021000100009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S1646-28902021000100009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Objectives:  To evaluate the influence of implant geometry and anatomical region on implant stability.  Methods:  A randomized controlled clinical trial was conducted on 45 patients, in whom a total of 79 implants were placed: 40 MIS C1 Implants and 39 MIS Seven Implants. The implant stability quotient was measured using resonance frequency analysis immediately after implant placement and 8 weeks later with an Osstell Mentor device.  Results:  76 implants were analyzed. The implant stability quotient was statistically significantly higher for secondary stability than primary stability (68.7}8,6 vs. 65.2}10.3, respectively, p=0.023). Considering primary stability, no statistical differences were found between the implant lengths 8.0 mm, 10.0 mm, 11.0 mm, and 11.5 mm (67.9}7.6, 63.9}10, 57.2}11.1, and 66.4}11.3, respectively, p=0.312). The same was observed for secondary stability (68.4}9.4, 67.9}9.3, 74.7}1.5, and 69.2}7.9, respectively, p=0.504). Also, there were no statistically significant differences between the implant diameters 3.75 mm and 4.20 mm concerning primary stability (64.3}8.7 and 66.1}11.7 respectively, p=0.445) or secondary stability (68.8}8.2 and 68.7}9.1 respectively, p=0.930). Regarding implant design, a statistically significant difference was found only for secondary stability, favoring MIS Seven implants (p=0.048). The intraoral location was statistically significant for both primary and secondary stability, as these were higher on the anterior maxilla than the posterior maxilla and mandible (p&lt;0.05).  Conclusions:  The diameter and length of the implants studied did not influence their stability. Implant design may influence secondary stability, whereas intraoral location has a relevant effect on primary and secondary stability.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo  Objetivos:  Avaliar a influencia da geometria dos implantes e região anatómica na estabilidade implantar.  Métodos:  Foi realizado um ensaio clinico controlado aleatorizado em 45 pacientes, onde foram colocados 79 implantes: 40 implantes MIS C1 e 39 implantes MIS Seven. O coeficiente de estabilidade do implante foi medido através da analise de frequência de ressonância (RFA) imediatamente apos a colocação do implante e 8 semanas depois, com Osstell Mentor.  Resultados:  Foram analisados 76 implantes. O coeficiente de estabilidade do implante registado para estabilidade secundaria foi significativamente maior que o verificado para a estabilidade primaria (68,7}8,6 e 65,2}10,3, p=0,023). Considerando a estabilidade primaria, não foi encontrada diferença estatisticamente significativa entre os comprimentos de 8,0 mm, 10,0 mm, 11,0 mm e 11,5 mm (67,9}7,6, 63,9}10, 57,2}11,1 e 66,4}11,3, p=0,312). O mesmo foi verificado para a estabilidade secundaria (68,4}9,4, 67,9}9,3, 74,7}1,5 e 69,2}7,9, p=0,504). Não se observou diferença estatisticamente significativa entre os diâmetros dos implantes de 3,75 e 4,20 mm e estabilidade primaria (64,3}8,7 e 66,1}11,7, p=0,445) ou estabilidade secundaria (68,8}8,2 e 68,7}9,1, p=0,930). Foi encontrada diferença estatisticamente significativa para a estabilidade secundaria, favorecendo o implante MIS Seven (p=0,048). A localização intraoral foi estatisticamente significativa para a estabilidade primaria e secundaria, sendo maior na maxila anterior em relação a maxila e mandíbula posteriores (p&lt;0,05).  Conclusões:  O diâmetro e o comprimento dos implantes estudados não influenciaram sua estabilidade. O tipo do implante parece influenciar a estabilidade secundaria, enquanto a região anatómica aparenta ter um efeito relevante na estabilidade primária e secundaria.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Implant design]]></kwd>
<kwd lng="en"><![CDATA[Implant diameter]]></kwd>
<kwd lng="en"><![CDATA[Implant length]]></kwd>
<kwd lng="en"><![CDATA[Implant stability]]></kwd>
<kwd lng="en"><![CDATA[Osseointegration]]></kwd>
<kwd lng="en"><![CDATA[Resonance frequency analysis]]></kwd>
<kwd lng="pt"><![CDATA[Desenho do implante]]></kwd>
<kwd lng="pt"><![CDATA[Diâmetro do implante]]></kwd>
<kwd lng="pt"><![CDATA[Comprimento do implante]]></kwd>
<kwd lng="pt"><![CDATA[Estabilidade do implante]]></kwd>
<kwd lng="pt"><![CDATA[Osseointegração]]></kwd>
<kwd lng="pt"><![CDATA[Analise de frequência de ressonância]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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