Paper Information

Journal:   JOURNAL OF RESEARCH IN DENTAL SCIENCES   SPRING 2008 , Volume 5 , Number 1; Page(s) 14 To 23.
 
Paper: 

PHARYNGEAL SPACE DIMENSION IN SUBJECT WITH CLASS I, II, III MALOCCLUSION

 
 
Author(s):  EMAMI MEIBODI SH.*, MEHRALIZADEH S., SHADALOEY M.
 
* ORTHODONTICS DEPT. DENTAL BRANCH ISLAMIC AZAD
 
Abstract: 

Background and aim: Recently, interest has been focused on pharyngeal dimensions because of a potential relationship between size and structure of upper airway and sleep-induced breathing disturbances Significant relationships between the pharyngeal structures and both dentofacial and craniofacial structures have been reported The aim of this study was to investigate the pharyngeal space dimensions in subjects with different malocclusion on the private clinic in Tehran in 2004-2008.
Material and Methods: Cephalometric radiograph of 90 subjects (45 females and 45 males, aged 12–18 years) were included with the following criteria: no history of orthodontic treatment; breathing comfortably through the nose; normal vertical occlusal relationship (Max/Man planes angle 25.5o ± 5) and divided into three groups according to the ANB angle, group 1, skeletal Class
I (ANB angle 1–5); group 2, skeletal Class II (ANB angle > 5); and group 3, skeletal Class III (ANB angle < 1). In addition, each group was divided into two subgroups according to sex. Statistical analysis was undertaken using analysis of 2-way ANOVA and least significant difference test. Lateral skull radiographs were traced on acetate paper and 12 hard and soft tissue cephalometric points were registered yielding 12 linear measurements.
Results: Sex differences were found in Class
I  and I and I subjects. The female has bigger SPAS/MIS and SPAS/IAS than male and the HRGN/C3H has increase in female than male. The distance between hyoid bone and C3 is longer in class III than class II.The height of airway space was reduced in Class II male subject compared with class I and III.We found relationship between ANB and position of hyoid bone to C3H and tongue length and tongue height.VAL was significantly reduced in class II subjects compared with class III & I in male.
Conclusion: The results showed that malocclusion can change the position of hyoid bone to mandibular plan and C3H and the vertical air way space in male. We found the relation sip between ANB angle and tongue and hyoid bone.we found Sex differences were detected in superior airway and the position of hyoid bone.

 
Keyword(s): PHARANGEAL SPACE, CL I, II, III.HYOID BONE
 
References: 
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