title: Relation of jaw sounds and kinematics visualized and quantified using 3-D computer animation.
abstract: The management of jaw pain or temporomandibular disorders (TMD) has been controversial regarding temporomandibular joint (TMJ) sounds and their implication regarding TMD prognosis. 3-D computer animation was used to visualize and quantify the internal mechanics of natural mandibular motion synchronized with TMJ sounds. Mandibular movements of four TMD patients and two healthy subjects were recorded using CCD cameras and reflective markers. Sounds were recorded with electret microphones. Magnetic resonance imaging was used to create 3-D geometric models. Visualization of the internal anatomy, mandibular condyle and glenoid fossa, revealed that the condyle initially rotated within the fossa and then moved out of the fossa along, and well beyond, the articular eminence. Power in the opening sound recordings after the condyle moved out of the fossa was significantly greater than when the condyle was within the fossa (p<0.001). The louder opening sounds were often classified as TMJ clicks, implying that clicks occur after the condyle moves out of the fossa. The 3-D computer animation should help resolve the implication of TMJ sounds regarding TMD prognosis by providing visualization and quantization of the TMJ internal mechanics during sound production.
authors.affiliation: Department of Radiology, University of Pittsburgh, Pittsburgh PA 15213, USA. jklst3@pitt.edu
authors.forename: Joseph K
authors.initials: JK
authors.lastname: Leader
authors.forename: J Robert
authors.initials: JR
authors.lastname: Boston
authors.forename: Thomas E
authors.initials: TE
authors.lastname: Rudy
authors.forename: Carol M
authors.initials: CM
authors.lastname: Greco
authors.forename: Hussein S
authors.initials: HS
authors.lastname: Zaki
mesh_terms: D000328:Adult; D001314:Auscultation / Q000379:methods*; D003936:Diagnosis, Computer-Assisted / Q000379:methods; D005260:Female; D006801:Humans; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D007574:Jaw Relation Record / Q000379:methods; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D009068:Movement; D013016:Sound; D013223:Statistics as Topic; D013704:Temporomandibular Joint / Q000503:physiopathology; D013705:Temporomandibular Joint Disorders / Q000175:diagnosis / Q000503:physiopathology*; D014741:Video Recording / Q000379:methods*