2013•Sichuan Medical JournalRequires access
The early permanent dentition of the two-phase treatment of skeletal III malocclusion
Liu Chang-chu
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Abstract
Objective To analyze the efficacy and hard tissue changes after dual-phase treatment of permanent teeth skeletal Class Ⅲ malocclusion.Methods The early permanent due to inadequate or maxillary retrusion of skeletal Class Ⅲ malocclusion 20 patients from January 2000 to December 2007,all with dual-phase treatment,namely protraction treatment then fixed straight wire appliance,and before and after treatment cephalometric Results SNA angle increased by 3.1 degrees,the ANB angle increases by 3.2 degrees,SN-MP angle increased by 3.3 degrees,U1-NA distance increased by 2.2mm,U1-L1 angle increases by 4 degrees,P0.05 The difference was statistically significant.Conclusion Protraction appliance can promote early permanent maxillary lift before crossbite,improve patient face with fixed double.