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Quintessence Publishing: Journals: QI
Quintessence International

Edited by Eli Eliav

ISSN 0033-6572 (print) • ISSN 1936-7163 (online)

January 2013
Volume 44 , Issue 1

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

Karic, Vesna V. / Miller, Victor J. / Nehete, Swati R. / Ofec, Ronen / Smidt, Ami

Page: 44 PMID: 23573535
DOI: 10.3290/j.qi.a28735

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. Method and Materials: 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. Conclusion: A positive correlation was found between TOI and AI in the myogenous TMD group. Keywords: condylar asymmetry, myogenous, opening index, TMDs

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