摘要
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 The purpose of this retrospective study was to evaluate clinical effects of casting rapid maxillary expander （RME） on Class I malocclusion with mild to moderate crowding. Methods The sample consisted of 32 subjects with Class I malocclusions who were treated without tractions by fixed edgewise appliances, and were divided into 2 groups according to different treatment protocol： group I comprised 17 patients at a mean age of 13.6 years （SD, 1.6） , who had casting RME during orthodontic treatment. Group ]l comprised 15 patients at a mean age of 13.2 years （ SD, 1.1 ） , and were treated with fixed appliances without RME. The lateral eephalometricradiographs were taken at T1 （pre-treatment） and T2（ post-treatment）, and the cephalometric analysis was conducted to identify the dental and skeletal changes. Results No significant differences were observed in the value of mandibular angle and that of facial height between the two groups. RME produced significantly lesserinclinationof theupper incisors. Lower incisors were proelined labially in both groups （ group I = 4.05°, groupII= 7.16°, P 〉 0.05 ）. The values for U1-NA and L1-NB increased significantly in control group compared with that in RME group. There was no statistically significant defference of dental upper molar measurement（U6-MxP） between the groups. Conclusions The casting RME might relieve crowding and create spaces via widening the dental arch, which can prevent molar extrusion and control lower facial height effectively.
出处
《口腔材料器械杂志》
2013年第2期76-80,98,共6页
Chinese Journal of Dental Materials and Devices
