Temporomandibular joint and masticatory muscle involvement in myotonic dystrophy: A study by magnetic resonance imaging

Temporomandibular joint and masticatory muscle involvement in myotonic dystrophy: A study by magnetic resonance imaging

Author Zanoteli, E. Google Scholar
Yamashita, H. K. Google Scholar
Suzuki, H. Google Scholar
Oliveira, ASB Google Scholar
Gabbai, Alberto Alain Autor UNIFESP Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Associacao Cirurgioes Dent Campinas
Abstract Objective. the purpose of this stud(y) was to evaluate the masticatory muscles and the temporomandibular joint (TMJ) by magnetic resonance imaging (MRI) in myotonic dystrophy (MD) patients.Study design. MRI of the masticatory muscles and TMJ was performed in 15 MD patients, 11 male and 4 female, aged 16 to 53 years (mean, 31 years). Many of them had dental malocclusion, especially Angle class III and anterior open bite, and 3 complained of recurrent TMJ dislocation. TMJ and masticatory muscle pain was not observed, and joint sounds were noted in only I patient.Results. the analysis of MRI scans showed masticatory muscle involvement in 13 patients (86.6%). in , the involvement was moderate to intense. the main abnormalities observed were increased intramuscular tissue signal on T1 (fatty infiltration) and volumetric reduction of muscles. Regarding the TMJ, articular disk displacement was seen in only 1 patient, but abnormalities of disk shape were common. Mild bone abnormalities were frequently observed, including changes of shape and contour of bone surface, and sclerosis of bone marrow. in 4 patients the condyle moved anterior to the eminence with the mouth opened fully (condylar hyperexcursion).Conclusions. This study shows that masticatory muscles are frequently and intensively affected in MD patients. Bone changes are the most consistent abnormalities observed in the TMJ. It is possible that remodeling is caused by biomechanical changes in the jaw as a result of masticatory muscle involvement.
Language English
Date 2002-08-01
Published in Oral Surgery Oral Medicine Oral Pathology Oral Radiology and Endodontics. St Louis: Mosby, Inc, v. 94, n. 2, p. 262-271, 2002.
ISSN 1079-2104 (Sherpa/Romeo, impact factor)
Publisher Mosby, Inc
Extent 262-271
Origin http://dx.doi.org/10.1067/moe.2002.124580
Access rights Closed access
Type Article
Web of Science ID WOS:000177957100022
URI http://repositorio.unifesp.br/handle/11600/26941

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