Home Magazines Editors-in-Chief FAQs Contact Us

Position and orientation of hyoid bone in mouth breathing children: a cephalometric study


Journal of Dental Health, Oral Disorders & Therapy
Zornitsa Vulcheva, Hristina Arnautska

Abstract

Introduction: The importance of the hyoid bone is associated with its unique anatomical
position. The hyoid bone is the only bone in the facial skeleton that attaches to other bones
only with the help of muscles.
Aim: The aim of this article is to make a cephalometric analysis of the craniofacial anatomy
and position of the hyoid bone in children with mixed dentition who have difficult nasal
breathing, habitual mouth breathing and a control group of nasal breathing children.
Materials and methods: A total of 120 lateral cephalograms of children with mixed
dentition were analyzed. The examined X-rays were divided into three groups: 50 lateral
cephalograms of children with difficult nasal breathing; 18 lateral cephalograms of children
with a habitual mouth breathing and 52 lateral cephalograms of nasal breathing children.
To determine the position of the hyoid bone we used the method of Bibby and Preston.1
Results: When comparing the type of the hyoid triangle we found the presence of a
statistically significant difference (χ2 = 24.97; p <0.001). In 84% of the children with nasal
breathing difficulties there is a negative hyoid triangle and in only 16.00% a positive hyoid
triangle. In the nasal breathing children, the positive triangle occurs in 84.60% of cases.
In children with habitual mouth breathing the distribution is almost even. A significant
difference was found when comparing the height of the negative triangle in children with
nasal breathing difficulties and nasal breathing children (t = 6.06; p <0.001).
Conclusion: In mouth breathing children there is a lower and posterior position of the
hyoid bone compared to nasal breathing children. The negative triangle is characteristic for
children, who have difficult nasal breathing, whereas the positive triangle is specific for nasal
breathing children.

Keywords

nasal breathing difficulties, habitual mouth breathing, hyoid bone

Testimonials