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Strain Distribution in a Kennedy Class I Implant Assisted Removable Partial Denture under Various Loading Conditions.

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Strain Distribution in a Kennedy Class I Implant Assisted Removable Partial Denture under Various Loading Conditions.

Auteurs : Reza Shahmiri [Nouvelle-Zélande] ; John M. Aarts ; Vincent Bennani ; Raj Das ; Michael V. Swain

Source :

International journal of dentistry [ 1687-8728 ] ; 2013.

RBID : pubmed:23737788

Abstract

Purpose. This in vitro study investigates how unilateral and bilateral occlusal loads are transferred to an implant assisted removable partial denture (IARPD). Materials and Methods. A duplicate model of a Kennedy class I edentulous mandibular arch was made and then a conventional removable partial denture (RPD) fabricated. Two Straumann implants were placed in the second molar region, and the prosthesis was modified to accommodate implant retained ball attachments. Strain gages were incorporated into the fitting surface of both the framework and acrylic to measure microstrain ( μ Strain). The IARPD was loaded to 120Ns unilaterally and bilaterally in three different loading positions. Statistical analysis was carried out using SPSS version 18.0 (SPSS, Inc., Chicago, IL, USA) with an alpha level of 0.05 to compare the maximum μ Strain values of the different loading conditions. Results. During unilateral and bilateral loading the maximum μ Strain was predominantly observed in a buccal direction. As the load was moved anteriorly the μ Strain increased in the mesial area. Unilateral loading resulted in a twisting of the structure and generated a strain mismatch between the metal and acrylic surfaces. Conclusions. Unilateral loading created lateral and vertical displacement of the IARPD. The curvature of the dental arch resulted in a twisting action which intensified as the unilateral load was moved anteriorly.

DOI: 10.1155/2013/351279
PubMed: 23737788

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<author><name sortKey="Shahmiri, Reza" sort="Shahmiri, Reza" uniqKey="Shahmiri R" first="Reza" last="Shahmiri">Reza Shahmiri</name>
<affiliation wicri:level="1"><nlm:affiliation>Department of Oral Rehabilitation, Faculty of Dentistry, University of Otago, P.O. Box 647, Dunedin 9054, New Zealand.</nlm:affiliation>
<country xml:lang="fr">Nouvelle-Zélande</country>
<wicri:regionArea>Department of Oral Rehabilitation, Faculty of Dentistry, University of Otago, P.O. Box 647, Dunedin 9054</wicri:regionArea>
</affiliation>
</author>
<author><name sortKey="Aarts, John M" sort="Aarts, John M" uniqKey="Aarts J" first="John M" last="Aarts">John M. Aarts</name>
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<author><name sortKey="Bennani, Vincent" sort="Bennani, Vincent" uniqKey="Bennani V" first="Vincent" last="Bennani">Vincent Bennani</name>
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<author><name sortKey="Das, Raj" sort="Das, Raj" uniqKey="Das R" first="Raj" last="Das">Raj Das</name>
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<author><name sortKey="Swain, Michael V" sort="Swain, Michael V" uniqKey="Swain M" first="Michael V" last="Swain">Michael V. Swain</name>
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<affiliation wicri:level="1"><nlm:affiliation>Department of Oral Rehabilitation, Faculty of Dentistry, University of Otago, P.O. Box 647, Dunedin 9054, New Zealand.</nlm:affiliation>
<country xml:lang="fr">Nouvelle-Zélande</country>
<wicri:regionArea>Department of Oral Rehabilitation, Faculty of Dentistry, University of Otago, P.O. Box 647, Dunedin 9054</wicri:regionArea>
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<author><name sortKey="Aarts, John M" sort="Aarts, John M" uniqKey="Aarts J" first="John M" last="Aarts">John M. Aarts</name>
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<author><name sortKey="Bennani, Vincent" sort="Bennani, Vincent" uniqKey="Bennani V" first="Vincent" last="Bennani">Vincent Bennani</name>
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<author><name sortKey="Das, Raj" sort="Das, Raj" uniqKey="Das R" first="Raj" last="Das">Raj Das</name>
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<author><name sortKey="Swain, Michael V" sort="Swain, Michael V" uniqKey="Swain M" first="Michael V" last="Swain">Michael V. Swain</name>
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<series><title level="j">International journal of dentistry</title>
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<front><div type="abstract" xml:lang="en">Purpose. This in vitro study investigates how unilateral and bilateral occlusal loads are transferred to an implant assisted removable partial denture (IARPD). Materials and Methods. A duplicate model of a Kennedy class I edentulous mandibular arch was made and then a conventional removable partial denture (RPD) fabricated. Two Straumann implants were placed in the second molar region, and the prosthesis was modified to accommodate implant retained ball attachments. Strain gages were incorporated into the fitting surface of both the framework and acrylic to measure microstrain ( μ Strain). The IARPD was loaded to 120Ns unilaterally and bilaterally in three different loading positions. Statistical analysis was carried out using SPSS version 18.0 (SPSS, Inc., Chicago, IL, USA) with an alpha level of 0.05 to compare the maximum μ Strain values of the different loading conditions. Results. During unilateral and bilateral loading the maximum μ Strain was predominantly observed in a buccal direction. As the load was moved anteriorly the μ Strain increased in the mesial area. Unilateral loading resulted in a twisting of the structure and generated a strain mismatch between the metal and acrylic surfaces. Conclusions. Unilateral loading created lateral and vertical displacement of the IARPD. The curvature of the dental arch resulted in a twisting action which intensified as the unilateral load was moved anteriorly.</div>
</front>
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<Abstract><AbstractText>Purpose. This in vitro study investigates how unilateral and bilateral occlusal loads are transferred to an implant assisted removable partial denture (IARPD). Materials and Methods. A duplicate model of a Kennedy class I edentulous mandibular arch was made and then a conventional removable partial denture (RPD) fabricated. Two Straumann implants were placed in the second molar region, and the prosthesis was modified to accommodate implant retained ball attachments. Strain gages were incorporated into the fitting surface of both the framework and acrylic to measure microstrain ( μ Strain). The IARPD was loaded to 120Ns unilaterally and bilaterally in three different loading positions. Statistical analysis was carried out using SPSS version 18.0 (SPSS, Inc., Chicago, IL, USA) with an alpha level of 0.05 to compare the maximum μ Strain values of the different loading conditions. Results. During unilateral and bilateral loading the maximum μ Strain was predominantly observed in a buccal direction. As the load was moved anteriorly the μ Strain increased in the mesial area. Unilateral loading resulted in a twisting of the structure and generated a strain mismatch between the metal and acrylic surfaces. Conclusions. Unilateral loading created lateral and vertical displacement of the IARPD. The curvature of the dental arch resulted in a twisting action which intensified as the unilateral load was moved anteriorly.</AbstractText>
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Strain Distribution in a Kennedy Class I Implant Assisted Removable Partial Denture under Various Loading Conditions.

Strain Distribution in a Kennedy Class I Implant Assisted Removable Partial Denture under Various Loading Conditions.

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