title: An experimental orthopedic treatment of the rat mandible using a functional appliance alters the fibre and myosin types in masticatory muscles.
abstract: Masticatory muscles mediate the action of functional orthopedic appliances on mandible growth. When young rats were treated for four weeks with a postural hyperpropulsor of the mandible, an appliance designed to increase condylar cartilage growth rate, the proportion of fast non-fatigable fibres in the lateral pterygoid muscle increased significantly. Concomitantly, the amount of slow-myosin light chains increased in fibre extracts. This slow myosin originated from IIA fibres. By functional orthopedic treatment, the lateral pterygoid muscle was enriched in less fatigable fibres; the changes observed in the lateral pterygoid muscle were close to changes observed in other muscles after training.
authors.affiliation: INSERM, U 213, Faculté de Médecine, Strasbourg, France.
authors.forename: C
authors.initials: C
authors.lastname: Oudet
authors.forename: A
authors.initials: A
authors.lastname: Petrovic
authors.forename: P
authors.initials: P
authors.lastname: Garcia
mesh_terms: D000251:Adenosine Triphosphatases / Q000378:metabolism; D000818:Animals; D004591:Electrophoresis, Polyacrylamide Gel; D006863:Hydrogen-Ion Concentration; D008297:Male; D008334:Mandible / Q000254:growth & development*; D008410:Masticatory Muscles / Q000378:metabolism* / Q000648:ultrastructure; D009218:Myosins / Q000378:metabolism*; D009967:Orthodontic Appliances; D011626:Pterygoid Muscles / Q000378:metabolism / Q000648:ultrastructure; D051381:Rats; D011919:Rats, Inbred Strains; D012518:Sarcomeres / Q000648:ultrastructure
chemical_list: D000251:Adenosine Triphosphatases; D009218:Myosins