Magnetic resonance imaging analysis on the relationship between anterior disc displacement and balancing-side occlusal contact.
The purpose of this study was to evaluate the relationship between balancing-side occlusal contact patterns and the prevalence of the internal derangement of the temporomandibular joint (TMJ). Forty-one patients were used for the magnetic resonance image (MRI) analysis of TMJ and occlusal examination. Balancing-side occlusal contact patterns observed during mandibular lateral excursive movements were classified into the three following categories: group A, simultaneous balancing-side contact, group B, balancing-side contact (with clenching only) and Group C, no balancing-side contact (with or without clenching). By the occlusal examination of 57 sides, 31.6% showed group A, 8.8% showed group B and 59.6% showed group C contact. Group A could not be observed in the patient group with normal disc position. In the disc displacement group, the prevalence of group A, group B and group C were 40.9, 6.8 and 52.3%, respectively. The higher prevalence of simultaneous balancing-side contact was revealed to be associated with articular disc dislocation.
Ohta
M
M
Department of Removable Prosthodontics, Okayama University Dental School, Okayama City, Okayama, Japan.
Minagi
S
S
Sato
T
T
Okamoto
M
M
Shimamura
M
M
D000293:Adolescent; D000328:Adult; D000368:Aged; D005157:Facial Pain / Q000503:physiopathology; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging; D008297:Male; D008310:Malocclusion / Q000175:diagnosis / Q000503:physiopathology*; D008875:Middle Aged; D010003:Osteoarthritis / Q000503:physiopathology; D013704:Temporomandibular Joint / Q000503:physiopathology*; D013705:Temporomandibular Joint Disorders / Q000503:physiopathology*