前牙深覆盖是指上前牙切端至下前牙唇面的最大水平距离超过3mm。其形成原因主要包括上颌或上牙弓长度较大、下颌或下牙弓长度较小,或二者兼有。深覆则是由于上下牙弓和(或)上、下颌骨垂直向发育异常所致,临床表现为上前牙牙冠覆盖下前牙牙冠唇面1/3以上[1]。由于深覆、深覆盖的形成受到遗传、环境等诸多因素的 Deep anterior teeth cover refers to the upper anterior teeth incision to the maximum horizontal distance of more than 3mm. The main reasons for the formation of the maxillary or upper dental arch length, mandibular or lower dental arch length smaller, or both. Deep overburden is due to the upper and lower dental arch and (or), vertical mandibular dysplasia, the clinical manifestations of the anterior crown crowns cover the anterior crown crown lip more than 1/3 [1]. Due to the deep overburden, the formation of deep overburden is influenced by many factors such as genetics and environment