A study of condylar movement by bilateral simultaneous videofluorography

Area of Science:

• Biomedical Engineering
• Orthodontics
• Radiology

Background:

• Temporomandibular disorders (TMD) encompass a range of conditions affecting the temporomandibular joints (TMJs).
• Internal derangement of the TMJ, characterized by abnormal disk position, is a common cause of TMD symptoms.
• Accurate diagnosis of TMJ internal derangement is crucial for effective treatment planning.

Purpose of the Study:

• To analyze condylar movements in patients with temporomandibular disorders (TMD).
• To investigate the interrelationship between the disk position and condylar kinematics in both temporomandibular joints (TMJs).
• To compare bilateral simultaneous videofluorography findings with magnetic resonance imaging (MRI) disk positions.

Main Methods:

• Bilateral simultaneous videofluorography and MRI were performed on 52 patients diagnosed with TMJ internal derangement.
• TMJs were categorized based on MRI findings: superior disk position (SDP), reducing disk displacement (RDD), and nonreducing disk displacement (NDD).
• Condylar movements were analyzed from videofluorography and correlated with MRI-based diagnoses.

Main Results:

• Nonreducing disk displacement (NDD) joints exhibited significantly shorter condylar movement ranges at maximum mouth opening compared to superior disk position (SDP) or reducing disk displacement (RDD) joints.
• Three condylar movement patterns were identified: normal (69% SDP), deflected (55% RDD), and short (77% NDD).
• Condylar movement in one TMJ could influence the range and pattern of movement in the contralateral TMJ.

Conclusions:

• Condylar movement analysis is a valuable tool for assessing TMJ disk status due to their close relationship.
• The range and pattern of condylar movement in both TMJs are mutually interrelated.
• Comprehensive bilateral examination of TMJs is recommended for patients with internal derangement symptoms for accurate diagnosis.