Objective To obtain and analyze the characteristics of the lingual arch forms of Guangxi Zhuang adolescents with normal occlusion.

METHODS: Using a simple semi-fixed lingual arch combined with the edgewise technology to correct 8 cases with linguoclination or buccoclination of the mandibular molars.

Objective: to introduce a new pin and tube removable lingual arch system into the orthodontic treatment, as well its fabrication method, implication and treatment design.