Objective To evaluate the treatment effects of double parabolic lingual springs appliance and open vertical loops in combination with straight wire appliance therapy on skeletal class Ⅲ malocclusion in early permanent dentition.Methods 30 cases with skeletal class Ⅲ malocclusion in early permanent dentition were treated by double parabolic lingual springs appliance and open vertical loops in combination with straight wire appliance.Cephalometric tracing measurement was taken to analyze and compare between pretreatment and posttreatment.Results The comparison of before and after orthodontic treatment showed angle SNA increased (3.20 ± 0.36) °,angle SNB decreased (-0.39 ± 0.48) °,angle ANB decreased (4.69 ± 1.34) °,Ls-E increased (3.50 ± 1.14) mm (t=-4.65,2.73,-8.42,-4.32,all P＜0.01).Conclusion The above metioned technique could be a reliable way to treat mild and moderate skeletal class Ⅲ malocclusion.

Objective To evaluate the treatment effects of double parabolic lingual springs appliance and straight wire appliance therapy in skeletal class Ⅲ malocclusion. Methods 12 cases with skeletal class Ⅲ malocclusion were treated by double parabolic lingual springs appliance and straight wire appliance, cephalometric tracing measurement were taken in analysis,compared between pretreatment and posttreatment in each case. Results The comparison of before and after orthodontic treatment showed angle SNA increased by 2.80°, angle SNB decreased 1.39°ANB decreased by 4.88°. Conclusion The above metioned technique could be a reliable way to treat mild and moderate skeletal class Ⅲ malocclusion.

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