Horizontal condylar path in patients with disk displacement with reduction

Area of Science:

• Temporomandibular joint (TMJ) disorders research
• Biomechanical analysis of jaw movements
• Diagnostic imaging in dentistry

Background:

• Disk displacement with reduction is a common temporomandibular joint (TMJ) disorder.
• Understanding condylar path variations is crucial for diagnosing and managing TMJ dysfunction.
• Computerized axiography offers a quantitative method to analyze mandibular kinematics.

Purpose of the Study:

• To analyze the horizontal condylar path during mandibular opening and closing in patients with disk displacement with reduction.
• To investigate the relationship between condylar path types and clinical symptoms.
• To explore correlations between condylar path characteristics, contralateral joint behavior, and disk displacement patterns.

Main Methods:

• Utilized computerized axiography to record horizontal condylar tracings in 32 patients.
• Classified condylar paths during opening into 15 distinct types.
• Correlated axiographic findings with clinical symptoms and magnetic resonance imaging (MRI) assessed disk displacement patterns.

Main Results:

• Identified 15 types of horizontal condylar tracings during mandibular opening.
• No clear correlation was found between condylar path types and subjective clinical symptoms.
• A specific correspondence in tracing types between the right and left TMJs was observed.
• Medial deviation of one condyle and lateral deviation of the contralateral condyle occurred in 21 of 32 patients at maximum opening.
• A straight condylar path from maximum opening to pre-click position was noted in most patients with medio-lateral deviation.
• Some condylar path types showed a relationship with disk displacement patterns identified via MRI.

Conclusions:

• Horizontal condylar path analysis using axiography reveals diverse patterns in disk displacement with reduction.
• While specific deviations and side-to-side correspondences exist, direct links to clinical symptoms are not consistently found.
• The relationship between condylar path morphology and underlying disk displacement requires further investigation.