Mandibular movement in lateral excursions

Area of Science:

• Dental Science
• Biomechanics
• Kinesiology

Background:

• Understanding normal mandibular movement is crucial for diagnosing and treating occlusal and TMJ disorders.
• Previous research often assumes symmetrical jaw function, which may not reflect reality in healthy individuals.

Purpose of the Study:

• To investigate the characteristics of mandibular movement during lateral articulatory tasks in young subjects.
• To identify patterns of symmetry, direction changes, and displacement coincidence in jaw motion.

Main Methods:

• Utilized a closed-circuit television movement detector to record mandibular kinematics.
• Analyzed movement vectors in three orthogonal planes to create movement envelopes.
• Examined young subjects with no apparent dental disease or malocclusion.

Main Results:

• Observed frequent deviations from symmetrical mandibular movement patterns.
• Noted frequent, sudden small changes in the direction of jaw movement.
• Found that maximum displacement in different movement vectors did not always occur simultaneously.

Conclusions:

• Mandibular movement in healthy young adults is often asymmetrical and dynamic.
• Factors such as dental restorations may initiate variations from typical mandibular pathways.
• Further research is needed to correlate dental interventions with observed kinematic changes.