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Lingual appliances have several clear-cut advantages over labial appliances: 1) "invisible" lingual appliances; 2) reduction of facial surfaces damage 3) no adverse effect on facial gingival tissues; 4) precise evaluation of the position of the teeth; 5) accuracy of evaluation of facial soft tissue contours. But the appliances have disadvantages also; tongue irritation; speech problem; bite opening; difficulty in controlling the torque of anterior teeth; more demand of anchorage value. Author have treated skeletal class II malocclusion with crowding and anterior crossbite. The result could be summarized as follows;
Harmonious facial profile and functional occlusion are obtained. Tongue irritation and speech problem were not severe;and adapted easily by patient. There was a increase in mandibular plane angle; but no difficulty in controlling incisor torque.
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