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Temporomandibular Disorders: The Habitual Chewing Side Syndrome
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Journal Article
Temporomandibular Disorders: The Habitual Chewing Side Syndrome
2013
Overview
Temporomandibular disorders are the most common cause of chronic orofacial pain, but, except where they occur subsequent to trauma, their cause remains unknown. This cross-sectional study assessed chewing function (habitual chewing side) and the differences of the chewing side and condylar path and lateral anterior guidance angles in participants with chronic unilateral temporomandibular disorder. This is the preliminary report of a randomized trial that aimed to test the effect of a new occlusal adjustment therapy.
The masticatory function of 21 randomly selected completely dentate participants with chronic temporomandibular disorders (all but one with unilateral symptoms) was assessed by observing them eat almonds, inspecting the lateral horizontal movement of the jaw, with kinesiography, and by means of interview. The condylar path in the sagittal plane and the lateral anterior guidance angles with respect to the Frankfort horizontal plane in the frontal plane were measured on both sides in each individual.
Sixteen of 20 participants with unilateral symptoms chewed on the affected side; the concordance (Fisher's exact test, P = .003) and the concordance-symmetry level (Kappa coefficient κ = 0.689; 95% confidence interval [CI], 0.38 to 0.99; P = .002) were significant. The mean condylar path angle was steeper (53.47(10.88) degrees versus 46.16(7.25) degrees; P = .001), and the mean lateral anterior guidance angle was flatter (41.63(13.35) degrees versus 48.32(9.53) degrees P = .036) on the symptomatic side.
The results of this study support the use of a new term based on etiology, \"habitual chewing side syndrome\", instead of the nonspecific symptom-based \"temporomandibular joint disorders\"; this denomination is characterized in adults by a steeper condylar path, flatter lateral anterior guidance, and habitual chewing on the symptomatic side.
Publisher
Public Library of Science,Public Library of Science (PLoS)
Subject
/ Adult
/ Adults
/ Aged
/ Biology
/ Chewing
/ Etiology
/ Female
/ Habits
/ Humans
/ Jaw
/ Male
/ Mandibular Condyle - pathology
/ Mandibular Condyle - physiopathology
/ Medicine
/ Pain
/ Patients
/ Teeth
/ Temporomandibular Joint Disorders - complications
/ Temporomandibular Joint Disorders - etiology
/ Temporomandibular Joint Disorders - pathology
/ Temporomandibular Joint Disorders - physiopathology
/ Trauma
