Cephalometric Analysis of Twin Force Appliance in Treatment of Skeletal class III Malocclusion

Objective: To evaluate the clinical effect of the apply of Twin Force Appliance in the early permanent dentition with mild skeletal Class Ⅲ malocclusion by cephalometric analysis.Method: Apply the trans Twin Force appliance to treat 12 cases of mild skeletal Class Ⅲ malocclusion of early permanent dentition,and compare the results of X-ray cephalometry before and after treatment.Results: After an average period of 8.2 months,the patient's facial profile is improved obviously: the crossbite of the front teeth is corrected,the molar relationship is Class I,the both SNA and ANB increase 3°,and Ptm-A increases 5mm,while the SNB and NPog-FH don't change significantly.Conclusion: The trans Twin Force Appliance can promote the development of maxillary,and correct the deformity rapidly and effectively of mild skeletal Class Ⅲ Malocclusion in early permanent dentition.And it is less dependent on the patients'cooperation.Moreover,patients feel comfortable and easy to accept when wearing the Twin Force Appliance.