Viscoelasticity of Human Oral Mucosa: Implications for Masticatory Biomechanics
Identifieur interne : 004A33 ( Main/Exploration ); précédent : 004A32; suivant : 004A34Viscoelasticity of Human Oral Mucosa: Implications for Masticatory Biomechanics
Auteurs : A. Sawada [Japon] ; N. Wakabayashi [Japon] ; M. Ona [Japon] ; T. Suzuki [Japon]Source :
- Journal of dental research [ 0022-0345 ] ; 2011.
Descripteurs français
- Pascal (Inist)
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- topic : Homme.
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Abstract
The dynamic behavior of oral soft tissues supporting removable prostheses is not well understood. We hypothesized that the stress and strain of the mucosa exhibited time-dependent behavior under masticatory loadings. Displacement of the mucosa on the maxillary residual ridge was measured in vivo by means of a magnetic actuator/sensor under vertical loading in partially edentulous individuals. Subject-specific finite element models of homogeneous bone and mucosa were constructed based on computed tomography images. A mean initial elastic modulus of 8.0 x 10-5 GPa and relaxation time of 494 sec were obtained from the curve adaptation of the finite element output to the in vivo time-displacement relationship. Delayed increase of the maximum compressive strain on the surface of the mucosa was observed under sustained load, while the maximum strain inside the mucosa was relatively low and uninfluenced by the duration of the load. The compressive stress showed a slight decrease with sustained load, due to stress relaxation of the mucosa. On simulation of cyclic load, the increment of the maximum strain and the evidence of residual strain were revealed after each loading. The results support our hypothesis, and suggest that sustained and repetitive loads accumulate as surface strain on the mucosa.
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Sawada</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Department of Removable Prosthodontics, School of Dentistry, Iwate Medical University</s1><s2>Iwate</s2><s3>JPN</s3><sZ>1 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Japon</country><placeName><settlement type="city">Morioka</settlement><region type="prefecture">Préfecture d'Iwate</region></placeName><orgName type="university">Université de médecine d'Iwate</orgName></affiliation></author><author><name sortKey="Wakabayashi, N" sort="Wakabayashi, N" uniqKey="Wakabayashi N" first="N." last="Wakabayashi">N. Wakabayashi</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Department of Removable Partial Prosthodontics, Graduate School, Tokyo Medical and Dental University, 1-5-45, Yushima</s1><s2>Bunkyo, Tokyo 113-8549</s2><s3>JPN</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Japon</country><placeName><settlement type="city">Tokyo</settlement><region type="région">Région de Kantō</region></placeName></affiliation></author><author><name sortKey="Ona, M" sort="Ona, M" uniqKey="Ona M" first="M." last="Ona">M. Ona</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Department of Removable Partial Prosthodontics, Graduate School, Tokyo Medical and Dental University, 1-5-45, Yushima</s1><s2>Bunkyo, Tokyo 113-8549</s2><s3>JPN</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Japon</country><placeName><settlement type="city">Tokyo</settlement><region type="région">Région de Kantō</region></placeName></affiliation></author><author><name sortKey="Suzuki, T" sort="Suzuki, T" uniqKey="Suzuki T" first="T." last="Suzuki">T. Suzuki</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Department of Removable Prosthodontics, School of Dentistry, Iwate Medical University</s1><s2>Iwate</s2><s3>JPN</s3><sZ>1 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Japon</country><placeName><settlement type="city">Morioka</settlement><region type="prefecture">Préfecture d'Iwate</region></placeName><orgName type="university">Université de médecine d'Iwate</orgName></affiliation></author></analytic><series><title level="j" type="main">Journal of dental research</title><title level="j" type="abbreviated">J. dent. res.</title><idno type="ISSN">0022-0345</idno><imprint><date when="2011">2011</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of dental research</title><title level="j" type="abbreviated">J. dent. res.</title><idno type="ISSN">0022-0345</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Biomechanics</term><term>Chewing</term><term>Computerized axial tomography</term><term>Dental prosthesis</term><term>Dentistry</term><term>Finite element method</term><term>Human</term><term>Mathematical model</term><term>Mechanical stress</term><term>Modeling</term><term>Mucosa</term><term>Oral cavity</term><term>Rheological properties</term><term>Stress analysis</term><term>Viscoelasticity</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Viscoélasticité</term><term>Cavité buccale</term><term>Muqueuse</term><term>Homme</term><term>Biomécanique</term><term>Analyse contrainte</term><term>Modèle mathématique</term><term>Modélisation</term><term>Contrainte mécanique</term><term>Méthode élément fini</term><term>Tomodensitométrie</term><term>Mastication</term><term>Propriété rhéologique</term><term>Dentisterie</term><term>Prosthodontie</term><term>Prothèse dentaire</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Homme</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The dynamic behavior of oral soft tissues supporting removable prostheses is not well understood. We hypothesized that the stress and strain of the mucosa exhibited time-dependent behavior under masticatory loadings. Displacement of the mucosa on the maxillary residual ridge was measured in vivo by means of a magnetic actuator/sensor under vertical loading in partially edentulous individuals. Subject-specific finite element models of homogeneous bone and mucosa were constructed based on computed tomography images. A mean initial elastic modulus of 8.0 x 10<sup>-5</sup> GPa and relaxation time of 494 sec were obtained from the curve adaptation of the finite element output to the in vivo time-displacement relationship. Delayed increase of the maximum compressive strain on the surface of the mucosa was observed under sustained load, while the maximum strain inside the mucosa was relatively low and uninfluenced by the duration of the load. The compressive stress showed a slight decrease with sustained load, due to stress relaxation of the mucosa. On simulation of cyclic load, the increment of the maximum strain and the evidence of residual strain were revealed after each loading. The results support our hypothesis, and suggest that sustained and repetitive loads accumulate as surface strain on the mucosa.</div></front></TEI><affiliations><list><country><li>Japon</li></country><region><li>Préfecture d'Iwate</li><li>Région de Kantō</li></region><settlement><li>Morioka</li><li>Tokyo</li></settlement><orgName><li>Université de médecine d'Iwate</li></orgName></list><tree><country name="Japon"><region name="Préfecture d'Iwate"><name sortKey="Sawada, A" sort="Sawada, A" uniqKey="Sawada A" first="A." last="Sawada">A. Sawada</name></region><name sortKey="Ona, M" sort="Ona, M" uniqKey="Ona M" first="M." last="Ona">M. Ona</name><name sortKey="Suzuki, T" sort="Suzuki, T" uniqKey="Suzuki T" first="T." last="Suzuki">T. Suzuki</name><name sortKey="Wakabayashi, N" sort="Wakabayashi, N" uniqKey="Wakabayashi N" first="N." last="Wakabayashi">N. Wakabayashi</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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