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Ipsilateral interferences and working-side condylar movements.

B-Y Huang1, T Whittle, C C Peck

  • 1Jaw Function and Orofacial Pain Research Unit, Faculty of Dentistry, University of Sydney, Level 3, Professorial Unit, Westmead Centre for Oral Health, Westmead, NSW 2145, Australia.

Archives of Oral Biology
|September 13, 2005
PubMed
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A working-side occlusal alteration (OA) immediately and significantly impacts temporomandibular joint condylar movement. This interference causes more inferior and anterior condylar paths during jaw laterotrusion.

Area of Science:

  • Dentistry
  • Biomechanics
  • Temporomandibular Joint Disorders

Background:

  • Limited understanding exists regarding how occlusal changes affect temporomandibular joint (TMJ) function.
  • Occlusion plays a critical role in the complex biomechanics of the jaw.
  • Investigating occlusal interferences is crucial for understanding TMJ disorders.

Purpose of the Study:

  • To determine the immediate effects of a working-side occlusal alteration (OA) on the movement pathways of the working-side condylar points.
  • To analyze condylar point trajectories during standardized lateral jaw movements (laterotrusion) using a jaw-tracking system.

Main Methods:

  • Ten participants underwent ten trials of right laterotrusion.
  • Measurements were taken under three conditions: control (pre-OA), immediately after OA placement, and control (post-OA removal).

Related Experiment Videos

  • A jaw-tracking system recorded condylar point trajectories.

    • Main Results:

    • Occlusal alteration (OA) resulted in significantly more inferior and anterior working-side condylar paths compared to controls.
    • OA significantly reduced mandibular rotation around the antero-posterior and supero-inferior axes.
    • The opening angle of the jaw movement was significantly increased by the OA.

    Conclusions:

    • A working-side occlusal interference induces immediate and significant alterations in working-side condylar movement.
    • These findings highlight the sensitivity of TMJ function to occlusal changes.
    • Understanding these effects is vital for diagnosing and managing TMJ disorders.