title: The temporomandibular opening index and condylar asymmetry in myogenous TMD and non-TMD patients: report of a pilot study.
abstract: OBJECTIVE
  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.
  
  
  METHODS
  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.
  
  
  RESULTS
  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.
  
  
  CONCLUSIONS
  A positive correlation was found between TOI and AI in the myogenous TMD group.
authors.affiliation: Department of Restorative Dentistry, School of Oral Health Sciences, University of the Witwatersrand, Johannesburg, South Africa.
authors.forename: Vesna V
authors.initials: VV
authors.lastname: Karic
authors.forename: Victor J
authors.initials: VJ
authors.lastname: Miller
authors.forename: Swati R
authors.initials: SR
authors.lastname: Nehete
authors.forename: Ronen
authors.initials: R
authors.lastname: Ofec
authors.forename: Ami
authors.initials: A
authors.lastname: Smidt
mesh_terms: D000293:Adolescent; D000328:Adult; D002508:Cephalometry / Q000379:methods; D005260:Female; D006801:Humans; D008297:Male; D008335:Mandibular Condyle / Q000473:pathology / Q000503:physiopathology*; D008875:Middle Aged; D010865:Pilot Projects; D011862:Radiography, Panoramic; D016059:Range of Motion, Articular / Q000502:physiology*; D013704:Temporomandibular Joint / Q000473:pathology / Q000503:physiopathology*; D013706:Temporomandibular Joint Dysfunction Syndrome / Q000503:physiopathology*; D055815:Young Adult