Wearing of complete dentures reduces slow fibre and enhances hybrid fibre fraction in masseter muscle
Identifieur interne : 000A52 ( Istex/Checkpoint ); précédent : 000A51; suivant : 000A53Wearing of complete dentures reduces slow fibre and enhances hybrid fibre fraction in masseter muscle
Auteurs : E. Cvetko [Slovénie] ; P. Karen [République tchèque] ; I. Eržen [Slovénie]Source :
- Journal of Oral Rehabilitation [ 0305-182X ] ; 2012-08.
English descriptors
- KwdEn :
- Ageing, Area fraction, Area proportion, Biol, Blackwell publishing, Bres, Complete dentures, Complete teeth loss, Czech republic, Dentate, Dentate subjects, Denture, Denture wearers, Edentulous, Edentulous masseter muscle, Edentulous subjects, Fibre, Fibre types, Functional load, Hybrid, Isoforms, Masseter, Masseter muscle, Masticatory, Masticatory performance, Monoclonal antibodies, Morphological alterations, Muscle activity, Myhc, Myhc isoforms, Myosin, Numerical proportion, Oral rehabil, Prosthet dent, Stomatognathic, Stomatognathic system, Teeth loss, Wearer.
- Teeft :
- Ageing, Area fraction, Area proportion, Biol, Blackwell publishing, Bres, Complete dentures, Complete teeth loss, Czech republic, Dentate, Dentate subjects, Denture, Denture wearers, Edentulous, Edentulous masseter muscle, Edentulous subjects, Fibre, Fibre types, Functional load, Hybrid, Isoforms, Masseter, Masseter muscle, Masticatory, Masticatory performance, Monoclonal antibodies, Morphological alterations, Muscle activity, Myhc, Myhc isoforms, Myosin, Numerical proportion, Oral rehabil, Prosthet dent, Stomatognathic, Stomatognathic system, Teeth loss, Wearer.
Abstract
Summary Edentulous conditions and use of complete dentures alter the function of jaw muscles, which is presumably reflected in the myosin heavy chain (MyHC) isoform composition. This study is the first dealing with MyHC isoforms expression in edentulous persons with the aim to clarify to which extent the decreased functional load following teeth loss contributes to the changed muscle phenotype during ageing. We analysed MyHC expression in old masseter muscle at decreased and full functional load by comparing age‐matched edentulous and dentate subjects. Edentulous subjects had upper and lower complete dentures. Dentate subjects had at least 24 natural teeth in continuous dental arches with two molars present in each quadrant and normal intermaxillary relationship. The adaptive response to the reduced masticatory load was lower numerical and area proportion of MyHC‐1 expressing fibres and higher numerical proportion of hybrid fibres in edentulous compared with dentate subjects with no significant difference in the proportion of MyHC‐neo‐expressing fibres between both groups. We conclude that the observed differences in the proportion of fibre types between denture wearers and dentate subjects cannot be ascribed to degenerative changes intrinsic to the ageing muscle, but to functional differences in muscle activity and to morphological alterations of stomatognathic system accompanying the complete teeth loss.
Url:
DOI: 10.1111/j.1365-2842.2012.02294.x
Affiliations:
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ISTEX:A4E777AE153DB139876265ADC676396097EAEC6ALe document en format XML
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<front><div type="abstract">Summary Edentulous conditions and use of complete dentures alter the function of jaw muscles, which is presumably reflected in the myosin heavy chain (MyHC) isoform composition. This study is the first dealing with MyHC isoforms expression in edentulous persons with the aim to clarify to which extent the decreased functional load following teeth loss contributes to the changed muscle phenotype during ageing. We analysed MyHC expression in old masseter muscle at decreased and full functional load by comparing age‐matched edentulous and dentate subjects. Edentulous subjects had upper and lower complete dentures. Dentate subjects had at least 24 natural teeth in continuous dental arches with two molars present in each quadrant and normal intermaxillary relationship. The adaptive response to the reduced masticatory load was lower numerical and area proportion of MyHC‐1 expressing fibres and higher numerical proportion of hybrid fibres in edentulous compared with dentate subjects with no significant difference in the proportion of MyHC‐neo‐expressing fibres between both groups. We conclude that the observed differences in the proportion of fibre types between denture wearers and dentate subjects cannot be ascribed to degenerative changes intrinsic to the ageing muscle, but to functional differences in muscle activity and to morphological alterations of stomatognathic system accompanying the complete teeth loss.</div>
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