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Related Experiment Videos

Mouth opening: a new angle.

Ian Calder1, John Picard, Martin Chapman

  • 1Department of Anethesia and Intensive Care, National Hospital for Neurology and Neurosurgery, London, United Kingdom. icalder@aol.com

Anesthesiology
|September 26, 2003
PubMed
Summary
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Craniocervical extension is a key part of full mouth opening. This movement increases interdental distance, and restricting it may impact airway management.

Area of Science:

  • Biomechanics
  • Anatomy
  • Physiology

Background:

  • The relationship between craniocervical posture and mouth opening is not fully understood.
  • Authors hypothesized that craniocervical extension is involved in normal mouth opening.

Purpose of the Study:

  • To investigate the role of craniocervical extension in mouth opening.
  • To quantify the change in interdental distance with varying degrees of craniocervical extension.

Main Methods:

  • Twenty healthy volunteers participated in the study.
  • Interdental distance was measured at four different degrees of craniocervical extension.

Main Results:

  • Interdental distance significantly increased from 28 mm (slight flexion) to 46 mm (full extension).

Related Experiment Videos

  • Nearly maximal mouth opening was achieved with 26 degrees of craniocervical extension from neutral.

    • Conclusions:

    • Craniocervical extension is an integral component of complete mouth opening in conscious individuals.
    • Impaired craniocervical junction mobility due to disease or fixation devices may limit mouth opening.
    • Limited mouth opening can have significant implications for airway management procedures.