额外牙常见于上颌中切牙之间,多为单个,也可成对,3颗以上者少见。我科收治1例前磨牙区4颗额外牙病例,报道如下。临床资料患者,女,48岁,因“左上后牙龈反复肿痛半年加重3天”就 Extra teeth common in the maxillary incisors, mostly single, but also in pairs, more than 3 rare. I received 1 cases of premolar area 4 cases of additional teeth, reported below. Clinical data Patient, female, 48 years old, because of “upper left upper back gingiva repeated swelling and pain for six months to increase three days ”