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Association between nasal respiratory obstruction and vertical mandibular position
1Department of Orthodontics and Craniofacial Developmental Biology, Hiroshima University, Graduate School of Biomedical Sciences, Minami-ku, Hiroshima, Japan. noko@hiroshima-u.ac.jp
Journal of Oral Rehabilitation
|September 25, 2004
Summary
Nasal airway obstruction significantly increases mouth opening and vertical mandibular displacement. Body posture also affects mandibular position, with supine positions leading to greater mouth opening.
Area of Science:
- Dental occlusion and biomechanics
- Respiratory physiology
- Craniofacial morphology
Background:
- The vertical mandibular position influences upper airway patency.
- Mouth opening involves mandibular and tongue displacement.
- Understanding these relationships is crucial for respiratory health.
Purpose of the Study:
- To investigate mandibular displacement at rest.
- To determine the influence of respiration modes on mandibular position.
- To assess the impact of body postures on mandibular position.
Main Methods:
- Utilized a novel magnetic sensor system to measure vertical mandibular position.
- Placed magnets and sensors on upper and lower first molars.
- Experimentally induced nasal respiratory obstruction.
Main Results:
- Vertical mandibular position was significantly affected by nasal airway obstruction.
- Mouth opening duration increased significantly with nasal obstruction.
- Supine posture resulted in greater mouth opening compared to sitting or lateral positions.
Conclusions:
- Nasal respiratory disturbance is a key factor in mouth opening and breathing.
- Body posture significantly influences mandibular position and mouth opening.
- Findings highlight the interplay between respiration, posture, and craniofacial dynamics.
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