[Clinical study on the treatment of Class Ⅱ and ClassⅠmalocclusion in adolescents with mandibular recession using invisible orthodontic appliances without brackets].

The treatment effect of Twin-block appliance and non-bracket invisible appliance is comparable for Class Ⅱ division Ⅰ malocclusion in adolescents with mandibular retrognathia. Both can improve the morphology of the mandible and dentition, expand the upper airway, but non-bracket invisible appliance can further reduce inflammation and improve patients' comfort.