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Evaluation of the changes of airway dimensions after maxillary advancement and mandibular setback in the skeletal class 3 patients after 1 week and 6 months in Zahedan


Najmeh Tahvildar nejad
Assistant Professor, Dept. of  Orthodontics, Dental School, Zahedan University of Medical Sciences

Objective:
In the skeletal class 3 patients , maxilla is deficient in the 3 dimentions.This issue  relates to hard tissues and also soft tissues and functional spaces.The aim of this study  was the evaluation of the changes of airway dimentions after maxillary advancement and mandibular setback in the skeletal class 3 patients after 1 week and 6 months in  Zahedan.
Methods & Materials:
From 20 patients with skeletal class 3 malocclusion (maxillary retrognathism and mandibular prognathism) lateral cephalograms were taken before and after (1 week and 6 months) maxillary advancement and mandibular setback. After radiographic tracings, vertical and horizontal radiographic variables of the airway dimentions were measured 1 week and 6 months after surgery.
Results:
Hypopharyngial depth-PNS and oropharyngial depth (U –MPW) after one week increased that was significant. Nasopharyngial depth (V-LPW) changes was not significant(Pv=0/675) , but the changes of soft tissue parameters of upper face like nˈ-snpog,LA_VL,Sn -VL,SS-VL,no-VL were significant, the changes  of lower face was not significant. After 6 months all the parameters returned to the pre- surgery situation.    
Conclusions:
 Cl III patients’ treatment with orthognatic surgery could improve maxillary position, mid facial soft tissue profile and Hypopharyngial and oropharyngial dimentions. In the long term all the soft tissue and functional spaces parameters returned to the pre- surgery situation, because the mussles determines the final position of bones.      
Key words:
airway- maxillary advancement - mandibular setback


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محل نشر یا ارائه:  کنگره 10 انجمن ارتودنتیست ها
سال ایرانی :  1391
موضوع:  ارتودنسی
Level:  Postgraduate

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