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上切牙可出现不同程度的扭转,小于90°的切牙扭转,在临床上比较常见,而大于90°的切牙扭转,在临床上则比较少见,尤其是上切牙扭转180°使整个牙齿扭转过来就更为罕见。陈××,女,18岁,工人。于1980年5月3日来我院门诊矫治。口腔颌面部检查:面部两侧对称,上、下颌骨发育正常,(?)呈中性(牙合),(?)呈180°扭转,使牙齿的舌侧面朝向唇侧,无牙齿移位及牙轴倾斜,牙齿不松动,牙冠颜色正常,牙髓活力试验阳性。无外伤史。
Upper incisors may have different degrees of torsion, less than 90 ° of incisors torsion, is more common in clinical practice, and more than 90 ° of incisors torsion, is relatively rare in clinical practice, especially the upper incisors twisted 180 ° so that the whole Tooth twist is even more rare. Chen × ×, female, 18 years old, worker. May 3, 1980 came to our hospital clinics. Oral and maxillofacial examination: both sides of the face are symmetrical, the maxilla and mandible are well developed, (?) Are neutral (occlusal), and (?) Are twisted 180 ° so that the lingual side of the tooth faces the labial side with no tooth displacement And the tooth axis tilt, the teeth are not loose, the color of the normal crown, pulp vitality test was positive. No history of trauma.