在正畸治疗中,常遇到一些因牙列不齐,上下前牙唇侧位,在遇到意外或跌倒时将牙冠折断的患者,患者因牙列不齐,桩冠后牙列外观形态不美故要求矫治。在矫治过程中,如冠折1/3还可粘托槽排齐前牙,但如果冠折超过2/3就无法粘托槽上弓丝,也就无法排齐。针对这种特殊患者,我们在临床治疗中将垂直开大曲进行了改良,经临床应用取得了满意的效果。 1 病例报告 例1.男,21岁。恒牙列(?)中性,(?)唇侧位,冠折2/3以上,前牙拥挤3mm。 In orthodontic treatment, often encountered due to dentition missing, up and down the lateral lip, in the event of accident or fall off the crown of patients, patients due to dentition missing, posterior post crown appearance Therefore, the form of the United States requires correction. In the correction process, such as the crown off 1/3 but also brackets aligned anterior teeth, but if the crown more than 2/3 can not stick to the brackets on the wire, it can not be aligned. For this special patient, we will be in the clinical treatment of open Daqu improved, clinically achieved satisfactory results. 1 case report 1. Male, 21 years old. Permanent dentition (?) Neutral, (?) Labial position, crown 2/3 above, anterior crowded 3mm.