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Related Experiment Videos

Mandibular reference position: chin-point guided closure vs. final deglutition

A Celar1, E Siejka, J Schatz

  • 1Universitatsklinik fur Zahn-Mund-und Kieferheilkunde Abteilung fur festsitzende Wein, Austria.

Cranio : the Journal of Craniomandibular Practice
|January 1, 1996
PubMed
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The final deglutition (FD) position closely aligns with the reference position (RP) in most subjects. However, significant variations in FD, particularly anterior-inferior shifts, raise questions about its clinical reliability for guided closure.

Area of Science:

  • Dentistry
  • Biomechanics
  • Human Physiology

Background:

  • Mandibular positioning is crucial in dental diagnostics and treatment.
  • Computerized axiography is a key tool for analyzing jaw movements.
  • Understanding the relationship between swallowing and jaw positions is important for functional occlusion.

Purpose of the Study:

  • To compare the hinge axis positions of the final deglutition (FD) and reference position (RP) using computerized axiography.
  • To assess the variability and replicability of FD and RP in a cohort of subjects.
  • To evaluate the clinical reliability of the FD position in relation to the RP.

Main Methods:

  • Computerized axiography was used to record hinge axis movements in 262 subjects.
  • The reference position (RP) was determined by chin-point guidance.

Related Experiment Videos

  • The final deglutition (FD) position was quantified as the hinge axis position at the end of swallowing.

    • Main Results:

    • Average linear distances between FD and RP were minimal in both sagittal (0.32-0.33 mm) and frontal (0.02-0.04 mm) planes.
    • Approximately 46% of FD recordings were located anterior and inferior to RP, showing significant differences.
    • Replicability of both positions was high, with average deviations around 0.04 mm for FD and 0.09 mm for RP.

    Conclusions:

    • The final deglutition (FD) position generally shows a relative coincidence with the reference position (RP).
    • However, the observed variation in FD, especially anterior-inferior shifts, challenges its clinical reliability for ensuring guided closure.
    • Further research is needed to clarify the clinical implications of FD variations in relation to RP.