| Maxillary protraction has been applied in clinical treatments widely. Maxillary protraction with a face mask is an adequate treatment method for a growing patient who suffers from maxillary deficiency. Many researches have confirmed the correcting effects of protraction on maxillary retrognathia. However,the maxillary protraction for young adults with skeletal ClassⅢcrossbite has not been reported yet,What changes will take place on young adult with skeletal ClassⅢcrossbite by facemask protraction? We design this research to empound this problem.Objective:To investigate the clinical effects of young adults with skeletal crossbite by orthodontic treatment and to analyze the mechanism of facemask protraction. Methods:Totally 15 patients(7 males, 8 females) with skeletal crossbite from Department of Orthodontics of the Fourth Military Medical University were included in this study. The age of cases ranged from 18 to 24 years old (mean 19 years old). Some cases were applied removable appliance in upper jaw and fixed appliance in lower jaw. The others used fixed appliances in upper jaw(screw expansion with hooks) for protraction and bite plate with hooks in lower jaw. The course of facemask protraction was about 7 months. The time of treatment was 24 months on average. Celphalogram-Panoramic radiographs were taken for each case before and after treatments, the measured data were analyzed by paired-samples t test. Results:The profiles of all patients were shown significant changes and the molar relationship was changed from ClassⅢto ClassⅠ. After treatment, the significant differences were found(P<0.01) in the SNA,SNB,ANB,SND,FMA,IMPA angles, while 1-1,U1-NA,L1-NB,FMIA,FCA angles are showed no significant differences. Conclusion:This method can keep treatment of protraction continously. It is demonstrated in clinical practice that this therapy for treatment of young adults with skeletal ClassⅢcrossbite is an effective method. |
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