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[Effects of maxillary protraction on craniofacial structures and upper airway dimensions in skeletal Class III
Ping Nie1, Min Zhu, Xiao-feng Lu
1Department of Oral and Maxillofacial Surgery, Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China. nieping1011@sina.com
Purpose:
To evaluate the effect of maxillary protraction on upper airway dimensions in skeletal Class III malocclusions and to investigate the relationship between changes in craniofacial morphology and upper airway dimensions.
Methods:
22 patients who had maxillary retrognathism confirmed by cervical vertebral maturation and treated with face mask protraction. Pre- and post-treatment cephalometric radiographs were analyzed with SAS8.2 software package for paired t test and correlation analysis.
Results:
The dimensions of PNS-ad1,PNS-ad2,PSP-SPPW, P-MPW increased significantly (P<0.01), Tb-TPPW decreased significantly (P<0.05). The change of V-LPW was not significant (P>0.05).Correlation was found between changes of PNS-Ba and PNS-ad1, PNS-ad2,V-LPW (P<0.05);changes of Hy-H1 and P-MPW,V-LPW (P<0.05);changes of Hy-H0 and V-LPW (P<0.05). No correlation was found between other pharyngeal measurements and investigated craniofacial variables(P>0.05).
Conclusions:
Maxillary protraction can affect the upper airway structures. In addition, variables on craniofacial morphology are relative with upper airway dimensions.
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