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Viscoelasticity of human oral mucosa: implications for masticatory biomechanics.

Identifieur interne : 001573 ( PubMed/Corpus ); précédent : 001572; suivant : 001574

Viscoelasticity of human oral mucosa: implications for masticatory biomechanics.

Auteurs : A. Sawada ; N. Wakabayashi ; M. Ona ; T. Suzuki

Source :

Journal of dental research [ 1544-0591 ] ; 2011.

RBID : pubmed:21321067

English descriptors

KwdEn :
- Aged, Biomechanical Phenomena, Bite Force, Compressive Strength, Dental Stress Analysis (methods), Denture, Complete, Upper (adverse effects), Denture, Partial, Removable (adverse effects), Elastic Modulus, Finite Element Analysis, Humans, Jaw, Edentulous (physiopathology), Linear Models, Mastication, Maxilla (physiology), Middle Aged, Models, Biological, Mouth Mucosa (physiology), Stress, Mechanical, Time Factors, Viscosity.
MESH :
- adverse effects : Denture, Complete, Upper, Denture, Partial, Removable.
- methods : Dental Stress Analysis.
- physiology : Maxilla, Mouth Mucosa.
- physiopathology : Jaw, Edentulous.
- Aged, Biomechanical Phenomena, Bite Force, Compressive Strength, Elastic Modulus, Finite Element Analysis, Humans, Linear Models, Mastication, Middle Aged, Models, Biological, Stress, Mechanical, Time Factors, Viscosity.

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 × 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.

DOI: 10.1177/0022034510396881
PubMed: 21321067

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pubmed:21321067

Le document en format XML

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<affiliation><nlm:affiliation>Department of Removable Prosthodontics, School of Dentistry, Iwate Medical University, Iwate, Japan.</nlm:affiliation>
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<author><name sortKey="Wakabayashi, N" sort="Wakabayashi, N" uniqKey="Wakabayashi N" first="N" last="Wakabayashi">N. Wakabayashi</name>
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<author><name sortKey="Ona, M" sort="Ona, M" uniqKey="Ona M" first="M" last="Ona">M. Ona</name>
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<author><name sortKey="Suzuki, T" sort="Suzuki, T" uniqKey="Suzuki T" first="T" last="Suzuki">T. Suzuki</name>
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<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 × 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.</div>
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<Abstract><AbstractText>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 × 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.</AbstractText>
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Viscoelasticity of human oral mucosa: implications for masticatory biomechanics.

Viscoelasticity of human oral mucosa: implications for masticatory biomechanics.

Source :

English descriptors

Abstract

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

Pour générer des pages wiki