The Effect of Inter-Implant Distance on Retention and Resistance to Dislodging Forces for Mandibular Implant-Tissue-Supported Overdentures
Identifieur interne : 003083 ( Pmc/Curation ); précédent : 003082; suivant : 003084The Effect of Inter-Implant Distance on Retention and Resistance to Dislodging Forces for Mandibular Implant-Tissue-Supported Overdentures
Auteurs : Farhad Tabatabaian [Iran] ; Abolfazl Saboury [Iran] ; Zahra Sadat Sobhani [Iran] ; Vicki C. Petropoulos [États-Unis]Source :
- Journal of Dentistry (Tehran, Iran) [ 1735-2150 ] ; 2014.
Abstract
The effect of inter-implant distance on retention and resistance of implant-tissue-supported overdentures is lacking in the literature. An in vitro study was performed to evaluate this effect for mandibular implant-tissue-supported overdentures retained by two ball attachments.
An acrylic cast of an edentulous mandible was fabricated. Three pairs of implants were symmetrically placed at both sides of the midline. The inter-implant distance was 10, 25, and 35 millimeters in positions A, B and C, respectively. A framework simulating the overdenture was fabricated on the cast. Six attachment housings were placed within the overdenture. For each sample, two ball abutments were screwed onto the implant pairs and two pink nylon inserts were seated in their respective attachment housings. The samples were tested in three groups of 15 (A, B, and C). The testing machine applied tensile dislodging forces and peak loads were measured in three directions: vertical, oblique, and anterior-posterior. A one-way ANOVA followed by Tukey’s HSD was used to determine groups that were significantly different. Tests were carried out at 0.05 level of significance.
Peak loads for the anterior-posteriorly directed dislodging forces were significantly the highest for group C (P<0.05); 21.25 N±3.05 N, while there were no statistically significant differences among groups with vertically and obliquely directed forces (P>0.05).
Inter-implant distance did not affect the vertical retention and oblique resistance of mandibular implant-tissue-supported overdentures; however, it affected anterior-posterior resistance.
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PubMed: 25628676
PubMed Central: 4290769
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<author><name sortKey="Tabatabaian, Farhad" sort="Tabatabaian, Farhad" uniqKey="Tabatabaian F" first="Farhad" last="Tabatabaian">Farhad Tabatabaian</name>
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<wicri:regionArea> Assistant Professor, Department of Prosthodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran</wicri:regionArea>
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<author><name sortKey="Saboury, Abolfazl" sort="Saboury, Abolfazl" uniqKey="Saboury A" first="Abolfazl" last="Saboury">Abolfazl Saboury</name>
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<wicri:regionArea> Associate Professor, Department of Prosthodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran</wicri:regionArea>
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<author><name sortKey="Sobhani, Zahra Sadat" sort="Sobhani, Zahra Sadat" uniqKey="Sobhani Z" first="Zahra Sadat" last="Sobhani">Zahra Sadat Sobhani</name>
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<wicri:regionArea> Former Student, Dental School of Shahid Beheshti University of Medical Sciences, Tehran</wicri:regionArea>
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<author><name sortKey="Petropoulos, Vicki C" sort="Petropoulos, Vicki C" uniqKey="Petropoulos V" first="Vicki C" last="Petropoulos">Vicki C. Petropoulos</name>
<affiliation wicri:level="1"><nlm:aff id="af4-jod-11-506"> Associate Professor, Department of Preventive and Restorative Sciences, University of Pennsylvania School of Dental Medicine, United States</nlm:aff>
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea> Associate Professor, Department of Preventive and Restorative Sciences, University of Pennsylvania School of Dental Medicine</wicri:regionArea>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">The Effect of Inter-Implant Distance on Retention and Resistance to Dislodging Forces for Mandibular Implant-Tissue-Supported Overdentures</title>
<author><name sortKey="Tabatabaian, Farhad" sort="Tabatabaian, Farhad" uniqKey="Tabatabaian F" first="Farhad" last="Tabatabaian">Farhad Tabatabaian</name>
<affiliation wicri:level="1"><nlm:aff id="af1-jod-11-506"> Assistant Professor, Department of Prosthodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran</nlm:aff>
<country xml:lang="fr">Iran</country>
<wicri:regionArea> Assistant Professor, Department of Prosthodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran</wicri:regionArea>
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</author>
<author><name sortKey="Saboury, Abolfazl" sort="Saboury, Abolfazl" uniqKey="Saboury A" first="Abolfazl" last="Saboury">Abolfazl Saboury</name>
<affiliation wicri:level="1"><nlm:aff id="af2-jod-11-506"> Associate Professor, Department of Prosthodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran</nlm:aff>
<country xml:lang="fr">Iran</country>
<wicri:regionArea> Associate Professor, Department of Prosthodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran</wicri:regionArea>
</affiliation>
</author>
<author><name sortKey="Sobhani, Zahra Sadat" sort="Sobhani, Zahra Sadat" uniqKey="Sobhani Z" first="Zahra Sadat" last="Sobhani">Zahra Sadat Sobhani</name>
<affiliation wicri:level="1"><nlm:aff id="af3-jod-11-506"> Former Student, Dental School of Shahid Beheshti University of Medical Sciences, Tehran, Iran</nlm:aff>
<country xml:lang="fr">Iran</country>
<wicri:regionArea> Former Student, Dental School of Shahid Beheshti University of Medical Sciences, Tehran</wicri:regionArea>
</affiliation>
</author>
<author><name sortKey="Petropoulos, Vicki C" sort="Petropoulos, Vicki C" uniqKey="Petropoulos V" first="Vicki C" last="Petropoulos">Vicki C. Petropoulos</name>
<affiliation wicri:level="1"><nlm:aff id="af4-jod-11-506"> Associate Professor, Department of Preventive and Restorative Sciences, University of Pennsylvania School of Dental Medicine, United States</nlm:aff>
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea> Associate Professor, Department of Preventive and Restorative Sciences, University of Pennsylvania School of Dental Medicine</wicri:regionArea>
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<series><title level="j">Journal of Dentistry (Tehran, Iran)</title>
<idno type="ISSN">1735-2150</idno>
<idno type="eISSN">2008-2185</idno>
<imprint><date when="2014">2014</date>
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<front><div type="abstract" xml:lang="en"><sec><title>Objectives:</title>
<p>The effect of inter-implant distance on retention and resistance of implant-tissue-supported overdentures is lacking in the literature. An in vitro study was performed to evaluate this effect for mandibular implant-tissue-supported overdentures retained by two ball attachments.</p>
</sec>
<sec><title>Materials and Methods:</title>
<p>An acrylic cast of an edentulous mandible was fabricated. Three pairs of implants were symmetrically placed at both sides of the midline. The inter-implant distance was 10, 25, and 35 millimeters in positions A, B and C, respectively. A framework simulating the overdenture was fabricated on the cast. Six attachment housings were placed within the overdenture. For each sample, two ball abutments were screwed onto the implant pairs and two pink nylon inserts were seated in their respective attachment housings. The samples were tested in three groups of 15 (A, B, and C). The testing machine applied tensile dislodging forces and peak loads were measured in three directions: vertical, oblique, and anterior-posterior. A one-way ANOVA followed by Tukey’s HSD was used to determine groups that were significantly different. Tests were carried out at 0.05 level of significance.</p>
</sec>
<sec><title>Results:</title>
<p>Peak loads for the anterior-posteriorly directed dislodging forces were significantly the highest for group C (P<0.05); 21.25 N±3.05 N, while there were no statistically significant differences among groups with vertically and obliquely directed forces (P>0.05).</p>
</sec>
<sec><title>Conclusion:</title>
<p>Inter-implant distance did not affect the vertical retention and oblique resistance of mandibular implant-tissue-supported overdentures; however, it affected anterior-posterior resistance.</p>
</sec>
</div>
</front>
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<pmc article-type="research-article"><pmc-dir>properties open_access</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-ta">J Dent (Tehran)</journal-id>
<journal-id journal-id-type="iso-abbrev">J Dent (Tehran)</journal-id>
<journal-title-group><journal-title>Journal of Dentistry (Tehran, Iran)</journal-title>
</journal-title-group>
<issn pub-type="ppub">1735-2150</issn>
<issn pub-type="epub">2008-2185</issn>
<publisher><publisher-name>Tehran University of Medical Sciences</publisher-name>
</publisher>
</journal-meta>
<article-meta><article-id pub-id-type="pmid">25628676</article-id>
<article-id pub-id-type="pmc">4290769</article-id>
<article-id pub-id-type="publisher-id">jod-11-506</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Original Article</subject>
</subj-group>
</article-categories>
<title-group><article-title>The Effect of Inter-Implant Distance on Retention and Resistance to Dislodging Forces for Mandibular Implant-Tissue-Supported Overdentures</article-title>
</title-group>
<contrib-group><contrib contrib-type="author"><name><surname>Tabatabaian</surname>
<given-names>Farhad</given-names>
</name>
<xref ref-type="aff" rid="af1-jod-11-506"><sup>1</sup>
</xref>
<xref ref-type="corresp" rid="c1-jod-11-506"></xref>
</contrib>
<contrib contrib-type="author"><name><surname>Saboury</surname>
<given-names>Abolfazl</given-names>
</name>
<xref ref-type="aff" rid="af2-jod-11-506"><sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Sobhani</surname>
<given-names>Zahra Sadat</given-names>
</name>
<xref ref-type="aff" rid="af3-jod-11-506"><sup>3</sup>
</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Petropoulos</surname>
<given-names>Vicki C</given-names>
</name>
<xref ref-type="aff" rid="af4-jod-11-506"><sup>4</sup>
</xref>
</contrib>
</contrib-group>
<aff id="af1-jod-11-506"><label>1</label>
Assistant Professor, Department of Prosthodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran</aff>
<aff id="af2-jod-11-506"><label>2</label>
Associate Professor, Department of Prosthodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran</aff>
<aff id="af3-jod-11-506"><label>3</label>
Former Student, Dental School of Shahid Beheshti University of Medical Sciences, Tehran, Iran</aff>
<aff id="af4-jod-11-506"><label>4</label>
Associate Professor, Department of Preventive and Restorative Sciences, University of Pennsylvania School of Dental Medicine, United States</aff>
<author-notes><corresp id="c1-jod-11-506">Corresponding author: F. Tabatabaian, Department of Prosthodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran, <email>f_tabatabaian@yahoo.com</email>
</corresp>
</author-notes>
<pub-date pub-type="ppub"><month>9</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="epub"><day>30</day>
<month>9</month>
<year>2014</year>
</pub-date>
<volume>11</volume>
<issue>5</issue>
<fpage>506</fpage>
<lpage>515</lpage>
<history><date date-type="received"><day>28</day>
<month>3</month>
<year>2014</year>
</date>
<date date-type="accepted"><day>23</day>
<month>7</month>
<year>2014</year>
</date>
</history>
<permissions><copyright-statement>Copyright © Dental Research Center, Tehran University of Medical Sciences</copyright-statement>
<copyright-year>2014</copyright-year>
<license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by-nc/3.0/"><license-p>This is an open-access article distributed under the terms of the Creative Commons Attribution NonCommercial 3.0 License (CC BY-NC 3.0), which allows users to read, copy, distribute and make derivative works for non-commercial purposes from the material, as long as the author of the original work is cited properly.</license-p>
</license>
</permissions>
<abstract><sec><title>Objectives:</title>
<p>The effect of inter-implant distance on retention and resistance of implant-tissue-supported overdentures is lacking in the literature. An in vitro study was performed to evaluate this effect for mandibular implant-tissue-supported overdentures retained by two ball attachments.</p>
</sec>
<sec><title>Materials and Methods:</title>
<p>An acrylic cast of an edentulous mandible was fabricated. Three pairs of implants were symmetrically placed at both sides of the midline. The inter-implant distance was 10, 25, and 35 millimeters in positions A, B and C, respectively. A framework simulating the overdenture was fabricated on the cast. Six attachment housings were placed within the overdenture. For each sample, two ball abutments were screwed onto the implant pairs and two pink nylon inserts were seated in their respective attachment housings. The samples were tested in three groups of 15 (A, B, and C). The testing machine applied tensile dislodging forces and peak loads were measured in three directions: vertical, oblique, and anterior-posterior. A one-way ANOVA followed by Tukey’s HSD was used to determine groups that were significantly different. Tests were carried out at 0.05 level of significance.</p>
</sec>
<sec><title>Results:</title>
<p>Peak loads for the anterior-posteriorly directed dislodging forces were significantly the highest for group C (P<0.05); 21.25 N±3.05 N, while there were no statistically significant differences among groups with vertically and obliquely directed forces (P>0.05).</p>
</sec>
<sec><title>Conclusion:</title>
<p>Inter-implant distance did not affect the vertical retention and oblique resistance of mandibular implant-tissue-supported overdentures; however, it affected anterior-posterior resistance.</p>
</sec>
</abstract>
<kwd-group><kwd>Dental Implant</kwd>
<kwd>Overdenture</kwd>
<kwd>Dental Prosthesis Retention</kwd>
<kwd>Implant-Supported Dental Prosthesis</kwd>
</kwd-group>
</article-meta>
</front>
<floats-group><fig id="f1-jod-11-506" position="float"><label>Fig 1.</label>
<caption><p>Design of the different parts. Locations of implants, overdenture, and force application points based on the hypothetical triangular design</p>
</caption>
<graphic xlink:href="jod-11-506f1"></graphic>
</fig>
<fig id="f2-jod-11-506" position="float"><label>Fig 2.</label>
<caption><p>The framework with a special design seated on the test cast while encircling the six implants</p>
</caption>
<graphic xlink:href="jod-11-506f2"></graphic>
</fig>
<fig id="f3-jod-11-506" position="float"><label>Fig 3.</label>
<caption><p>Ball attachment set including three components: ball abutment (below), attachment housing (above, external part), and pink nylon insert (above, internal part)</p>
</caption>
<graphic xlink:href="jod-11-506f3"></graphic>
</fig>
<fig id="f4-jod-11-506" position="float"><label>Fig 4.</label>
<caption><p>Overdenture. Attachment housings with pink nylon inserts placed within the overdenture housing</p>
</caption>
<graphic xlink:href="jod-11-506f4"></graphic>
</fig>
<fig id="f5-jod-11-506" position="float"><label>Fig 5.</label>
<caption><p>Zwick testing machine. Connections of the machine, load cell, overdenture, and test cast for load transmission</p>
</caption>
<graphic xlink:href="jod-11-506f5"></graphic>
</fig>
<fig id="f6-jod-11-506" position="float"><label>Fig 6.</label>
<caption><p>Mean values and standard deviations of the peak loads (N) for vertically directed dislodging forces for three inter-implant distances: A (10mm), B (25mm), and C (35mm)</p>
</caption>
<graphic xlink:href="jod-11-506f6"></graphic>
</fig>
<fig id="f7-jod-11-506" position="float"><label>Fig 7.</label>
<caption><p>Mean values and standard deviations of the peak loads (N) for obliquely directed dislodging forces for three inter-implant distances: A (10mm), B (25mm), and C (35mm)</p>
</caption>
<graphic xlink:href="jod-11-506f7"></graphic>
</fig>
<fig id="f8-jod-11-506" position="float"><label>Fig 8.</label>
<caption><p>Mean values and standard deviations of the peak loads (N) for anterior-posteriorly directed dislodging forces for three inter-implant distances: A (10mm), B (25mm), and C (35mm)</p>
</caption>
<graphic xlink:href="jod-11-506f8"></graphic>
</fig>
</floats-group>
</pmc>
</record>
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