The temporomandibular opening index and condylar asymmetry in myogenous TMD and non-TMD patients: report of a pilot study

• Published in: Quintessence international (Berlin, Germany : 1985) Vol. 44; no. 1; p. e141
• Main Authors: Karic, Vesna V, Miller, Victor J, Nehete, Swati R, Ofec, Ronen, Smidt, Ami
• Format: Journal Article
• Language: English
• Published: Germany 01.01.2013
• Subjects: Adolescent; Adult; Cephalometry - methods; Female; Humans; Male; Mandibular Condyle - pathology; Mandibular Condyle - physiopathology; Middle Aged; Pilot Projects; Radiography, Panoramic; Range of Motion, Articular - physiology; Temporomandibular Joint - pathology; Temporomandibular Joint - physiopathology; Temporomandibular Joint Dysfunction Syndrome - physiopathology; Young Adult
• ISSN: 1936-7163
• DOI: 10.3290/j.qi.a28735

The temporomandibular opening index (TOI) is endfeel distance divided by active and passive mouth opening. The asymmetry index (AI) is a measure of difference in left and right condylar heights. This study examined the relationship between AI and TOI in myogenous TMD and non-TMD patients. Fourteen myogenous TMD patients diagnosed by the Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD) were recruited (1 man and 13 women) and 14 non-TMD patients (6 men and 8 women) were included as controls. Differences between the TMD patients and control group of non-TMD patients were determined by the two-tailed t test, while multiple linear regression analysis was used to examine the correlation between AI and TOI adjusting for sex and age. AI and TOI were significantly higher (P = .001 and P = .045, respectively) among TMD patients. A significant positive correlation was found between TOI and AI for the TMD group (r = 0.84, P = .01) but not for the control group. A positive correlation was found between TOI and AI in the myogenous TMD group.