Effect of the Number of Implants on Stress Distribution of Anterior Implant-Supported Fixed Prostheses Combined with a Removable Partial Denture: A Finite Element Analysis
Identifieur interne : 005809 ( Ncbi/Merge ); précédent : 005808; suivant : 005810Effect of the Number of Implants on Stress Distribution of Anterior Implant-Supported Fixed Prostheses Combined with a Removable Partial Denture: A Finite Element Analysis
Auteurs : Minoo Mahshid [Iran] ; Allahyar Geramy [Iran] ; Massoud Ejlali [Iran] ; Majid Sedaghat Monfared [Iran] ; Shirin Rezvani Habib Abadi [Iran]Source :
- Journal of Dentistry (Tehran, Iran) [ 1735-2150 ] ; 2014.
Abstract
The main goal of this study was to evaluate differences in stress distribution relevant to the number of implants under an anterior bridge when combined with a removable partial denture in the posterior region.
Four three-dimensional finite element models (3D FEM) were designed from a mandible containing an implant-supported bridge extending between canines, and a bilateral distal extension removable partial denture. A nonrigid connection was selected as the attachment method between the partial denture and the anterior implant-supported fixed prosthesis; 2, 3, 4 and 5 implants supporting the bridge all with 10mm length and 3.8 mm diameter were assessed. With the aid of the finite element program ANSYS 8.0, the models were loaded and von Mises stresses were evaluated.
In spongy bone, stress forces showed a decrease from 2 implants to 4 implants but showed an increase in the 5-implant model. Stresses on cortical bone of terminal implants were in similar range in the 2-, 3- and 4-implant models. While, in the 5-implant model the amount of stresses on terminal implants increased dramatically. The stresses on implants were nearly similar in all models, with the greatest amount on terminal implants.
Within the limitations of this study, 2-, 3- and 4-implant models showed less stress on cortical and spongy bone in comparison with the 5-implant model. The stresses transferred to implants were nearly similar.
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PubMed: 25628669
PubMed Central: 4290762
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Effect of the Number of Implants on Stress Distribution of Anterior Implant-Supported Fixed Prostheses Combined with a Removable Partial Denture: A Finite Element Analysis</title><author><name sortKey="Mahshid, Minoo" sort="Mahshid, Minoo" uniqKey="Mahshid M" first="Minoo" last="Mahshid">Minoo Mahshid</name><affiliation wicri:level="1"><nlm:aff id="af1-jod-11-335">Associate Professor, Prosthodontics Department, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran</nlm:aff><country xml:lang="fr">Iran</country><wicri:regionArea>Associate Professor, Prosthodontics Department, Dental School, Shahid Beheshti University of Medical Sciences, Tehran</wicri:regionArea><wicri:noRegion>Tehran</wicri:noRegion></affiliation></author><author><name sortKey="Geramy, Allahyar" sort="Geramy, Allahyar" uniqKey="Geramy A" first="Allahyar" last="Geramy">Allahyar Geramy</name><affiliation wicri:level="1"><nlm:aff id="af2-jod-11-335">Professor, Dental Research Center Dentistry Research Institute & Department of Orthodontics, Tehran University of Medical Sciences, Tehran, Iran</nlm:aff><country xml:lang="fr">Iran</country><wicri:regionArea>Professor, Dental Research Center Dentistry Research Institute & Department of Orthodontics, Tehran University of Medical Sciences, Tehran</wicri:regionArea><wicri:noRegion>Tehran</wicri:noRegion></affiliation></author><author><name sortKey="Ejlali, Massoud" sort="Ejlali, Massoud" uniqKey="Ejlali M" first="Massoud" last="Ejlali">Massoud Ejlali</name><affiliation wicri:level="1"><nlm:aff id="af3-jod-11-335">Assistant Professor, Prosthodontics Department, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran</nlm:aff><country xml:lang="fr">Iran</country><wicri:regionArea>Assistant Professor, Prosthodontics Department, Dental School, Shahid Beheshti University of Medical Sciences, Tehran</wicri:regionArea><wicri:noRegion>Tehran</wicri:noRegion></affiliation></author><author><name sortKey="Sedaghat Monfared, Majid" sort="Sedaghat Monfared, Majid" uniqKey="Sedaghat Monfared M" first="Majid" last="Sedaghat Monfared">Majid Sedaghat Monfared</name><affiliation wicri:level="1"><nlm:aff id="af3-jod-11-335">Assistant Professor, Prosthodontics Department, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran</nlm:aff><country xml:lang="fr">Iran</country><wicri:regionArea>Assistant Professor, Prosthodontics Department, Dental School, Shahid Beheshti University of Medical Sciences, Tehran</wicri:regionArea><wicri:noRegion>Tehran</wicri:noRegion></affiliation></author><author><name sortKey="Rezvani Habib Abadi, Shirin" sort="Rezvani Habib Abadi, Shirin" uniqKey="Rezvani Habib Abadi S" first="Shirin" last="Rezvani Habib Abadi">Shirin Rezvani Habib Abadi</name><affiliation wicri:level="1"><nlm:aff id="af4-jod-11-335">Assistant Professor, Prosthodontics Department, Dental School,Qazvin University of Medical Sciences, Qazvin, Iran</nlm:aff><country xml:lang="fr">Iran</country><wicri:regionArea>Assistant Professor, Prosthodontics Department, Dental School,Qazvin University of Medical Sciences, Qazvin</wicri:regionArea><wicri:noRegion>Qazvin</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">25628669</idno><idno type="pmc">4290762</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4290762</idno><idno type="RBID">PMC:4290762</idno><date when="2014">2014</date><idno type="wicri:Area/Pmc/Corpus">003082</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">003082</idno><idno type="wicri:Area/Pmc/Curation">003082</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Curation">003082</idno><idno type="wicri:Area/Pmc/Checkpoint">001501</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Checkpoint">001501</idno><idno type="wicri:Area/Ncbi/Merge">005809</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Effect of the Number of Implants on Stress Distribution of Anterior Implant-Supported Fixed Prostheses Combined with a Removable Partial Denture: A Finite Element Analysis</title><author><name sortKey="Mahshid, Minoo" sort="Mahshid, Minoo" uniqKey="Mahshid M" first="Minoo" last="Mahshid">Minoo Mahshid</name><affiliation wicri:level="1"><nlm:aff id="af1-jod-11-335">Associate Professor, Prosthodontics Department, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran</nlm:aff><country xml:lang="fr">Iran</country><wicri:regionArea>Associate Professor, Prosthodontics Department, Dental School, Shahid Beheshti University of Medical Sciences, Tehran</wicri:regionArea><wicri:noRegion>Tehran</wicri:noRegion></affiliation></author><author><name sortKey="Geramy, Allahyar" sort="Geramy, Allahyar" uniqKey="Geramy A" first="Allahyar" last="Geramy">Allahyar Geramy</name><affiliation wicri:level="1"><nlm:aff id="af2-jod-11-335">Professor, Dental Research Center Dentistry Research Institute & Department of Orthodontics, Tehran University of Medical Sciences, Tehran, Iran</nlm:aff><country xml:lang="fr">Iran</country><wicri:regionArea>Professor, Dental Research Center Dentistry Research Institute & Department of Orthodontics, Tehran University of Medical Sciences, Tehran</wicri:regionArea><wicri:noRegion>Tehran</wicri:noRegion></affiliation></author><author><name sortKey="Ejlali, Massoud" sort="Ejlali, Massoud" uniqKey="Ejlali M" first="Massoud" last="Ejlali">Massoud Ejlali</name><affiliation wicri:level="1"><nlm:aff id="af3-jod-11-335">Assistant Professor, Prosthodontics Department, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran</nlm:aff><country xml:lang="fr">Iran</country><wicri:regionArea>Assistant Professor, Prosthodontics Department, Dental School, Shahid Beheshti University of Medical Sciences, Tehran</wicri:regionArea><wicri:noRegion>Tehran</wicri:noRegion></affiliation></author><author><name sortKey="Sedaghat Monfared, Majid" sort="Sedaghat Monfared, Majid" uniqKey="Sedaghat Monfared M" first="Majid" last="Sedaghat Monfared">Majid Sedaghat Monfared</name><affiliation wicri:level="1"><nlm:aff id="af3-jod-11-335">Assistant Professor, Prosthodontics Department, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran</nlm:aff><country xml:lang="fr">Iran</country><wicri:regionArea>Assistant Professor, Prosthodontics Department, Dental School, Shahid Beheshti University of Medical Sciences, Tehran</wicri:regionArea><wicri:noRegion>Tehran</wicri:noRegion></affiliation></author><author><name sortKey="Rezvani Habib Abadi, Shirin" sort="Rezvani Habib Abadi, Shirin" uniqKey="Rezvani Habib Abadi S" first="Shirin" last="Rezvani Habib Abadi">Shirin Rezvani Habib Abadi</name><affiliation wicri:level="1"><nlm:aff id="af4-jod-11-335">Assistant Professor, Prosthodontics Department, Dental School,Qazvin University of Medical Sciences, Qazvin, Iran</nlm:aff><country xml:lang="fr">Iran</country><wicri:regionArea>Assistant Professor, Prosthodontics Department, Dental School,Qazvin University of Medical Sciences, Qazvin</wicri:regionArea><wicri:noRegion>Qazvin</wicri:noRegion></affiliation></author></analytic><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></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><sec><title>Objective:</title><p>The main goal of this study was to evaluate differences in stress distribution relevant to the number of implants under an anterior bridge when combined with a removable partial denture in the posterior region.</p></sec><sec><title>Materials and Methods:</title><p>Four three-dimensional finite element models (3D FEM) were designed from a mandible containing an implant-supported bridge extending between canines, and a bilateral distal extension removable partial denture. A nonrigid connection was selected as the attachment method between the partial denture and the anterior implant-supported fixed prosthesis; 2, 3, 4 and 5 implants supporting the bridge all with 10mm length and 3.8 mm diameter were assessed. With the aid of the finite element program ANSYS 8.0, the models were loaded and von Mises stresses were evaluated.</p></sec><sec><title>Results:</title><p>In spongy bone, stress forces showed a decrease from 2 implants to 4 implants but showed an increase in the 5-implant model. Stresses on cortical bone of terminal implants were in similar range in the 2-, 3- and 4-implant models. While, in the 5-implant model the amount of stresses on terminal implants increased dramatically. The stresses on implants were nearly similar in all models, with the greatest amount on terminal implants.</p></sec><sec><title>Conclusion:</title><p>Within the limitations of this study, 2-, 3- and 4-implant models showed less stress on cortical and spongy bone in comparison with the 5-implant model. The stresses transferred to implants were nearly similar.</p></sec></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Zarb, Ga" uniqKey="Zarb G">GA Zarb</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Lindquist, Lw" uniqKey="Lindquist L">LW Lindquist</name></author><author><name sortKey="Carlsson, Ge" uniqKey="Carlsson G">GE Carlsson</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Mccord, Jf" uniqKey="Mccord J">JF McCord</name></author><author><name sortKey="Grant, Aa" uniqKey="Grant A">AA Grant</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Jemt, T" uniqKey="Jemt T">T Jemt</name></author><author><name sortKey="Lindquist, L" uniqKey="Lindquist L">L Lindquist</name></author><author><name sortKey="Hedegard, B" uniqKey="Hedegard B">B Hedegard</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Misch, 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<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">25628669</article-id><article-id pub-id-type="pmc">4290762</article-id><article-id pub-id-type="publisher-id">jod-11-335</article-id><article-categories><subj-group subj-group-type="heading"><subject>Original Article</subject></subj-group></article-categories><title-group><article-title>Effect of the Number of Implants on Stress Distribution of Anterior Implant-Supported Fixed Prostheses Combined with a Removable Partial Denture: A Finite Element Analysis</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Mahshid</surname><given-names>Minoo</given-names></name><xref ref-type="aff" rid="af1-jod-11-335"><sup>1</sup></xref></contrib><contrib contrib-type="author"><name><surname>Geramy</surname><given-names>Allahyar</given-names></name><xref ref-type="aff" rid="af2-jod-11-335"><sup>2</sup></xref><xref ref-type="corresp" rid="c1-jod-11-335"></xref></contrib><contrib contrib-type="author"><name><surname>Ejlali</surname><given-names>Massoud</given-names></name><xref ref-type="aff" rid="af3-jod-11-335"><sup>3</sup></xref></contrib><contrib contrib-type="author"><name><surname>Sedaghat Monfared</surname><given-names>Majid</given-names></name><xref ref-type="aff" rid="af3-jod-11-335"><sup>3</sup></xref></contrib><contrib contrib-type="author"><name><surname>Rezvani Habib Abadi</surname><given-names>Shirin</given-names></name><xref ref-type="aff" rid="af4-jod-11-335"><sup>4</sup></xref></contrib></contrib-group><aff id="af1-jod-11-335"><label>1</label>Associate Professor, Prosthodontics Department, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran</aff><aff id="af2-jod-11-335"><label>2</label>Professor, Dental Research Center Dentistry Research Institute & Department of Orthodontics, Tehran University of Medical Sciences, Tehran, Iran</aff><aff id="af3-jod-11-335"><label>3</label>Assistant Professor, Prosthodontics Department, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran</aff><aff id="af4-jod-11-335"><label>4</label>Assistant Professor, Prosthodontics Department, Dental School,Qazvin University of Medical Sciences, Qazvin, Iran</aff><author-notes><corresp id="c1-jod-11-335">Corresponding author: A. Geramy, Department of Orthodontics, Tehran University of Medical Sciences, Tehran, Iran, mailto:<email>ramazani_nahid@yahoo.com</email>, <email>gueramya@tums.ac.ir</email></corresp></author-notes><pub-date pub-type="ppub"><month>5</month><year>2014</year></pub-date><pub-date pub-type="epub"><day>31</day><month>5</month><year>2014</year></pub-date><volume>11</volume><issue>3</issue><fpage>335</fpage><lpage>342</lpage><history><date date-type="received"><day>02</day><month>2</month><year>2014</year></date><date date-type="accepted"><day>09</day><month>3</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>Objective:</title><p>The main goal of this study was to evaluate differences in stress distribution relevant to the number of implants under an anterior bridge when combined with a removable partial denture in the posterior region.</p></sec><sec><title>Materials and Methods:</title><p>Four three-dimensional finite element models (3D FEM) were designed from a mandible containing an implant-supported bridge extending between canines, and a bilateral distal extension removable partial denture. A nonrigid connection was selected as the attachment method between the partial denture and the anterior implant-supported fixed prosthesis; 2, 3, 4 and 5 implants supporting the bridge all with 10mm length and 3.8 mm diameter were assessed. With the aid of the finite element program ANSYS 8.0, the models were loaded and von Mises stresses were evaluated.</p></sec><sec><title>Results:</title><p>In spongy bone, stress forces showed a decrease from 2 implants to 4 implants but showed an increase in the 5-implant model. Stresses on cortical bone of terminal implants were in similar range in the 2-, 3- and 4-implant models. While, in the 5-implant model the amount of stresses on terminal implants increased dramatically. The stresses on implants were nearly similar in all models, with the greatest amount on terminal implants.</p></sec><sec><title>Conclusion:</title><p>Within the limitations of this study, 2-, 3- and 4-implant models showed less stress on cortical and spongy bone in comparison with the 5-implant model. The stresses transferred to implants were nearly similar.</p></sec></abstract><kwd-group><kwd>Implants</kwd><kwd>Removable Partial Denture</kwd><kwd>Finite Element Analysis</kwd></kwd-group></article-meta></front><floats-group><fig id="f1-jod-11-335" position="float"><label>Fig 1.</label><caption><p>Number of implants (2, 3, 4, 5) in different models (A–D).</p><p>Anterior teeth designs were based on the average dimensions [<xref rid="b17-jod-11-335" ref-type="bibr">17</xref>]. Each model consisted of a cancellous core surrounded by 1 mm thick cortical layer and 1.5 mm thick gingiva.</p></caption><graphic xlink:href="jod-11-335f1"></graphic></fig><fig id="f2-jod-11-335" position="float"><label>Fig 2.</label><caption><p>Meshed model. (A) Fixed prosthesis with Patrix part (B) of Dalbo attachment. (C) Fixed and removable part attached by matrix part (D) of Dalbo attachment designed on removable prosthesis</p></caption><graphic xlink:href="jod-11-335f2"></graphic></fig><fig id="f3-jod-11-335" position="float"><label>Fig 3.</label><caption><p>lists the Von Mises stresses on spongy bone. Stress amounts showed a decrease from 2 implants to 4 implants but showed an increase in the 5-implant model.</p></caption><graphic xlink:href="jod-11-335f3"></graphic></fig><fig id="f4-jod-11-335" position="float"><label>Fig 4.</label><caption><p>Von Mises stresses on cortical bone.</p></caption><graphic xlink:href="jod-11-335f4"></graphic></fig><fig id="f5-jod-11-335" position="float"><label>Fig 5.</label><caption><p>Von Mises stresses on implants.</p></caption><graphic xlink:href="jod-11-335f5"></graphic></fig><table-wrap id="t1-jod-11-335" position="float"><label>Table 1.</label><caption><p>Mechanical properties of materials used</p></caption><table frame="hsides" rules="groups"><thead><tr><th valign="middle" align="center" rowspan="1" colspan="1"></th><th valign="middle" align="center" rowspan="1" colspan="1"><bold>Young’s Modulus (MPa)</bold></th><th valign="middle" align="center" rowspan="1" colspan="1"><bold>Poisson’s Ratio</bold></th></tr></thead><tbody><tr><td valign="middle" align="center" rowspan="1" colspan="1"><bold>Tooth</bold></td><td valign="middle" align="center" rowspan="1" colspan="1">20300</td><td valign="middle" align="center" rowspan="1" colspan="1">0.26</td></tr><tr><td valign="middle" align="center" rowspan="1" colspan="1"><bold>S bone</bold></td><td valign="middle" align="center" rowspan="1" colspan="1">13400</td><td valign="middle" align="center" rowspan="1" colspan="1">0.38</td></tr><tr><td valign="middle" align="center" rowspan="1" colspan="1"><bold>C bone</bold></td><td valign="middle" align="center" rowspan="1" colspan="1">34000</td><td valign="middle" align="center" rowspan="1" colspan="1">0.26</td></tr><tr><td valign="middle" align="center" rowspan="1" colspan="1"><bold>PDL</bold></td><td valign="middle" align="center" rowspan="1" colspan="1">0.668</td><td valign="middle" align="center" rowspan="1" colspan="1">0.49</td></tr><tr><td valign="middle" align="center" rowspan="1" colspan="1"><bold>Gingiva</bold></td><td valign="middle" align="center" rowspan="1" colspan="1">19.06</td><td valign="middle" align="center" rowspan="1" colspan="1">0.3</td></tr><tr><td valign="middle" align="center" rowspan="1" colspan="1"><bold>Co-Cr</bold></td><td valign="middle" align="center" rowspan="1" colspan="1">218000</td><td valign="middle" align="center" rowspan="1" colspan="1">0.3</td></tr><tr><td valign="middle" align="center" rowspan="1" colspan="1"><bold>Ti</bold></td><td valign="middle" align="center" rowspan="1" colspan="1">96000</td><td valign="middle" align="center" rowspan="1" colspan="1">0.36</td></tr></tbody></table></table-wrap></floats-group></pmc><affiliations><list><country><li>Iran</li></country></list><tree><country name="Iran"><noRegion><name sortKey="Mahshid, Minoo" sort="Mahshid, Minoo" uniqKey="Mahshid M" first="Minoo" last="Mahshid">Minoo Mahshid</name></noRegion><name sortKey="Ejlali, Massoud" sort="Ejlali, Massoud" uniqKey="Ejlali M" first="Massoud" last="Ejlali">Massoud Ejlali</name><name sortKey="Geramy, Allahyar" sort="Geramy, Allahyar" uniqKey="Geramy A" first="Allahyar" last="Geramy">Allahyar Geramy</name><name sortKey="Rezvani Habib Abadi, Shirin" sort="Rezvani Habib Abadi, Shirin" uniqKey="Rezvani Habib Abadi S" first="Shirin" last="Rezvani Habib Abadi">Shirin Rezvani Habib Abadi</name><name sortKey="Sedaghat Monfared, Majid" sort="Sedaghat Monfared, Majid" uniqKey="Sedaghat Monfared M" first="Majid" last="Sedaghat Monfared">Majid Sedaghat Monfared</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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