The relationship between temporomandibular joint disk displacement and mandibular asymmetry in skeletal Class III patients

• Published in: The Angle orthodontist Vol. 81; no. 4; pp. 624 - 631
• Main Authors: Choi, Hyung-Joo, Kim, Tae-Woo, Ahn, Sug-Joon, Lee, Shin-Jae, Donatelli, Richard E.
• Format: Journal Article
• Language: English
• Published: United States Edward H Angle Education and Research Foundation, Inc 01.07.2011
• Subjects: Adolescent; Adult; Cephalometry; Facial Asymmetry - complications; Female; Humans; Joint Dislocations - etiology; Magnetic Resonance Imaging; Male; Malocclusion, Angle Class III - complications; Original; Temporomandibular Joint Disc - pathology; Temporomandibular Joint Disorders - etiology; Young Adult
• ISSN: 0003-3219; 1945-7103; 1945-7103
• DOI: 10.2319/091210-532.1

To investigate the relationship between temporomandibular joint disk displacement (TMJ DD) and facial asymmetry in skeletal Class III patients. The subjects comprised 97 skeletal Class III adult patients seeking orthodontic treatment. In addition to the routine lateral and posteroanterior (PA) cephalograms, and regardless of the TMJ status, each subject consented to magnetic resonance imaging (MRI) to evaluate their TMJs. According to MRI readings, subjects were classified into four groups: group 1, bilateral normal disk position; group 2, bilateral DD with or without reduction; group 3, DD more advanced on the right side; and group 4, DD more advanced on the left side. PA and lateral cephalometric variables were analyzed to compare the four groups. When the TMJ DD was more advanced on one side than on the other, the chin point usually deviated to the advanced side. When the TMJ DD status was equal or bilaterally normal, the amount of mandibular deviation was not significant. If a skeletal Class III patient has an asymmetric face, especially in the mandibular region, careful examination is necessary with regard to the status of the TMJ during orthodontic diagnosis and treatment planning.