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Movement between centric relation contact position and the intercuspal position.

M D Wise1

  • 1Eastman Dental Hospital, London.

The International Journal of Prosthodontics
|July 1, 1992
PubMed
Summary
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This study examined temporomandibular joint (TMJ) axis movement during jaw motion. A higher ratio of vertical to horizontal incisal pin movement correlated with less horizontal TMJ axis shift, impacting clinical dental practices.

Area of Science:

  • Dental Mechanics
  • Biomechanics of the Temporomandibular Joint

Background:

  • Understanding the kinematics of the temporomandibular joint (TMJ) is crucial for diagnosing and treating occlusal disorders.
  • Previous research has focused on condylar pathways, but the relationship between incisal guidance and the rotational axis movement needs further clarification.

Purpose of the Study:

  • To investigate the correlation between the horizontal axis of rotation movement and incisal pin movements during the transition from centric relation to intercuspal position.
  • To determine how the ratio of vertical to horizontal incisal pin movement influences the horizontal displacement of the TMJ's rotational axis.

Main Methods:

  • Dental casts from 42 asymptomatic individuals were mounted on an articulator in centric relation.
  • The horizontal axis of rotation was measured during the simulated movement from centric relation to intercuspal position.

Related Experiment Videos

  • Vertical and horizontal incisal pin movements were recorded simultaneously.

    • Main Results:

    • A highly significant correlation was found between horizontal axis movement and the ratio of vertical to horizontal incisal pin movement.
    • Increased vertical to horizontal incisal pin movement ratio corresponded to decreased horizontal TMJ axis movement.
    • A smaller ratio (larger horizontal component) resulted in greater horizontal TMJ axis movement.

    Conclusions:

    • The ratio of incisal pin movements provides a predictable indicator of horizontal TMJ axis displacement.
    • These findings have clinical implications for understanding jaw mechanics and designing dental restorations or treatments.
    • Further research can explore the application of these kinematic relationships in clinical decision-making for TMJ disorders.