Lack of correlation between mouth-breathing and bite force

Area of Science:

• Pediatric dentistry
• Craniofacial morphology
• Respiratory physiology

Background:

• Mouth-breathing is common in children and associated with distinct facial characteristics.
• The impact of mouth-breathing on masticatory function, specifically bite force, remains unclear.
• Previous assumptions suggested a link between altered facial morphology and reduced muscle strength in mouth-breathers.

Purpose of the Study:

• To investigate the correlation between mouth-breathing and maximum bite force in children.
• To analyze the relationship between mouth-breathing, bite force, and craniofacial morphology.
• To determine if the characteristic 'long-face' morphology of mouth-breathers is linked to weaker masticatory muscles.

Main Methods:

• Studied 81 children aged 7–16 years.
• Diagnosed mouth-breathing using subject history, rhinomanometry (nasal airflow), and cephalometric analysis (airway size).
• Measured maximum bite force at the first molars and analyzed facial morphology from profile cephalograms.

Main Results:

• Mouth-breathing and bite force were both associated with specific facial morphologies.
• No statistically significant association was found between mouth-breathing and maximum bite force.
• Children exhibiting the 'long-face' morphology typical of mouth-breathers did not show weaker bite force.

Conclusions:

• The craniofacial morphology observed in children who mouth-breathe is not a result of diminished masticatory muscle strength.
• Mouth-breathing and bite force appear to be independently associated with facial morphology.
• Further research may explore other factors influencing masticatory function in pediatric mouth-breathers.