Electromyographic and kinesiographic study in patients with nonreducing disk displacement of the temporomandibular joint.
OBJECTIVE
The purpose of this study was to clarify electromyographic and mandibular kinesiographic properties of the chewing movements in patients with unilaterally painful nonreducing disk displacement of the temporomandibular joint.


METHODS
Chewing movement in 50 female patients was evaluated by electromyograph and mandibular kinesiograph, and the results were compared with those in 31 normal controls.


RESULTS
In the analysis by electromyograph, some differences between patients and controls were found. In the analysis by mandibular kinesiograph, chewing movement showed deviation to the chewing side in the TMJ-affected-side chewing but did not show deviation in the TMJ-unaffected-side chewing in the horizontal plane. The maximal anteroposterior width between opening and closing paths in the sagittal plane was smaller in the experimental subjects.


CONCLUSIONS
These differences between patients and controls may be helpful to diagnosis for painful nonreducing disk displacement of the temporomandibular joint.
Sato
S
S
Department of Oral and Maxillofacial Surgery I, Tohoku University, School of Dentistry, Sendai, Japan.
Goto
S
S
Takanezawa
H
H
Kawamura
H
H
Motegi
K
K
D000293:Adolescent; D000328:Adult; D002358:Cartilage, Articular / Q000503:physiopathology; D016022:Case-Control Studies; D004576:Electromyography; D005157:Facial Pain / Q000503:physiopathology; D005260:Female; D006801:Humans; D007574:Jaw Relation Record / Q000295:instrumentation; D008334:Mandible / Q000503:physiopathology*; D008409:Mastication; D008410:Masticatory Muscles / Q000503:physiopathology*; D009068:Movement; D013705:Temporomandibular Joint Disorders / Q000503:physiopathology*