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目的比较自锁托槽与传统托槽矫治下颌拥挤的临床疗效。方法选取2009年至2012年就诊于新疆医科大学第二附属医院并且用自锁托槽(23例)和传统托槽(23例)进行矫治下颌牙列拥挤的患者46例,收集其矫治前与矫治结束时的头颅侧位片和模型以及锥形束CT(CBCT)片,测量下颌中切牙牙体长轴与下颌平面之间的角度(L1-MP)、下颌中切牙牙体长轴与鼻根点和下齿槽座点之间的角度(L1-NB)、下颌两侧尖牙(WL3)之间的宽度、下颌两侧第一恒磨牙之间的宽度(WL6)、下颌第一磨牙牙体长轴与其相对应的两侧下颌骨下缘连线的角度(L6-LL)、下颌牙弓长度。结果治疗结束时,自锁托槽组的WL6比传统托槽组长约1.5mm,两组比较差异有显著统计学意义(P<0.01);自锁托槽组下颌牙弓长度比传统托槽组长约1.7mm,两组比较差异有统计学意义(P<0.05);自锁托槽组L6-LL比传统托槽组大约1.8°,两组比较差异有统计学意义(P<0.05);两组患者L1-NB和WL3以及WLS比较,差异均无统计学意义(P>0.05)。结论与传统托槽相比,自锁托槽减少了下颌前牙唇向倾斜度,增加了下颌磨牙之间宽度,但并未改变下颌牙弓基骨之间宽度,只是改变了磨牙颊向倾斜度。
Objective To compare the curative effect of mandibular crowding with self-ligating brackets and traditional brackets. Methods From 2009 to 2012, 46 patients with mandibular dentition crowding were treated with self-ligating brackets (23 cases) and traditional brackets (23 cases) at the Second Affiliated Hospital of Xinjiang Medical University. At the end of the treatment, the cranial lateral flaps and the model and the cone beam CT (CBCT) were measured. The angle between the mandibular incisor long axis and the mandibular plane (L1-MP), the mandibular incisor long axis and the nose (L1-NB), width between canines on both sides of mandible (WL3), width between first permanent molars on both sides of mandible (WL6), mandibular first molars The angle between the long axis of the tooth and the lower edge of the mandible on both sides of the tooth (L6-LL) and the length of the mandibular arch. Results At the end of treatment, the WL6 of the self-ligating bracket group was 1.5mm longer than that of the traditional bracket group, with significant difference between the two groups (P <0.01) (P <0.05). The L6-LL of the self-ligating bracket group was about 1.8 ° higher than that of the traditional bracket group, the difference between the two groups was statistically significant (P <0.05) There was no significant difference between the two groups in L1-NB, WL3 and WLS (P> 0.05). Conclusion Compared with the traditional brackets, self-ligating brackets reduce the inclination of the mandibular anterior lip and increase the width of the mandibular molar, but it does not change the width of the mandibular denture base, but only changes the molar cheek tilt degree.