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目的比较研究生理性支抗技术(PASS)与MBT直丝弓技术在需中度以上支抗拔牙病例中前牙排齐阶段对前牙控制临床效果是否有差异。方法选择40例正畸拔牙矫正病例,安氏I类18例,安氏II类22例,由于矫正需要均拔除上颌两颗第一前磨牙。随机分2组,一组使用PASS技术,一组使用传统MBT直丝弓技术。在矫正前(T1)及矫正中上颌前牙排齐时(T2)拍头颅侧位片。通过X线头影测量比较分析上中切牙位置及软组织的变化。结果 PASS组病例X线头影测量结果在T1、T2上前牙唇倾度变化不大,测量指标差异无统计学意义(P>0.05);传统MBT组病例在T1、T2出现上前牙明显唇倾,测量指标差异有统计学意义(P<0.05)。两组间比较,U1-SN和U1-L1差异有统计学意义(P<0.05),其余测量指标均无统计学意义(P>0.05)。结论正畸拔牙病例排齐阶段,使用PASS矫治技术更有利于利用拔牙间隙排齐上前牙。
Objective To compare the clinical effects of anterior teeth alignment with the anterior teeth alignment in the case of moderate to moderately elevated anterior teeth supported by PASS and MBT straight wire arch techniques. Methods Forty cases of orthodontic tooth extraction were selected, 18 cases of Class I and 22 cases of Class II malocclusion. All the maxillary two premolar teeth were needed for the correction. Randomly divided into two groups, a group using PASS technology, a group using the traditional MBT straight wire arch technology. In the pre-correction (T1) and correction of the maxillary anterior teeth alignment (T2) take the cephalometric slices. The position of upper incisors and the changes of soft tissue were analyzed by X-ray cephalometry. Results The results of X-cephalometry in PASS group showed no significant changes in the antegrade lip inclination at T1 and T2, and there was no significant difference between the two groups (P> 0.05). In the traditional MBT group, Tilt, measurement differences were statistically significant (P <0.05). The difference between U1-SN and U1-L1 was statistically significant (P <0.05). There was no significant difference between the two groups (P> 0.05). Conclusion Orthodontic cases of tooth extraction stage alignment, the use of PASS correction technique is more conducive to the use of extraction gap aligned upper teeth.