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目的探讨使用铸造式扩弓器非拔牙矫治安氏Ⅰ类错(?)伴轻中度牙列拥挤病例的临床疗效,为临床应用提供依据。方法选取32例安氏Ⅰ类错(?)畸形伴轻中度牙列拥挤病例。其中17例采用铸造式上颌扩弓配合固定矫治技术进行非拔牙正畸治疗(实验组);15例仅采取非拔牙的固定矫治(对照组)。分别在T1(正畸治疗前)、T2(正畸治疗结束)拍摄头颅侧位定位片并测量分析。结果头影测量分析显示两组间下颌平面角及前面高的增加无统计学差异(P>0.05)。对照组上前牙明显较扩弓组唇倾(P<0.05),下前牙唇倾量均有增加(扩弓组=4.05°,对照组=7.16°,P>0.05)。扩弓组上、下前牙突距(U1-NA和L1-NB)变化量更小(P<0.05)。两组间上颌磨牙垂直高度的变化无显著性差异。结论铸造式扩弓器在扩宽牙弓解除拥挤的同时,能有效地控制磨牙高度及面下1/3高度的变化。
Objective To investigate the clinical efficacy of casting extractor for the treatment of Angle Class Ⅰ malocclusion with mild to moderate crowding, and to provide the basis for clinical application. Methods 32 cases of Class Ⅰ malocclusion with mild to moderate dentition crowding cases were selected. Among them, 17 cases were treated with casting maxillary expansion combined with fixed orthodontic treatment (experimental group), and 15 cases were treated with non-extractive fixed orthodontics (control group). T1 (orthodontic treatment), T2 (end of orthodontic treatment) were taken cephalometric positioning and measurement analysis. Results The cephalometric analysis showed no significant difference in the mandibular plane angle and anterior height between the two groups (P> 0.05). The anterior teeth of the control group were significantly more than those of the anterior arch group (P <0.05), while the anterior and lip lip volumes of the anterior lower arch increased (expansion group = 4.05 °, control group = 7.16 °, P> 0.05). In the expanding group, the variations of the distance between the anterior and inferior anterior teeth (U1-NA and L1-NB) were smaller (P <0.05). There was no significant difference in the vertical height of the maxillary molars between the two groups. CONCLUSION: Casting expander can effectively control the height of molar and 1/3 lower height of face while widening dental arch to relieve congestion.