An adult female presented with severe closed overbite,class Ⅱ skeletal and dental malocclusion,low angle and straight face.Helped with the clear aligners,the class Ⅱ dental malocclusion was corrected by maxillary molars distalization,the occlusion of anterior teeth were opened by posterior teeth extention and anterior teeth intrusion,and finally a balanced occlusion and an ideal smile line were obtained.
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