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目的比较Hyrax快速与慢速扩弓矫治替牙晚期上颌狭窄的疗效。方法选取2011年1月至2012年12月来大连市口腔医院正畸科就诊的替牙晚期上颌基骨狭窄患者60例,随机分成2组,分别采用Hyrax快速扩弓与Hyrax慢速扩弓进行矫治,扩弓前后拍摄锥形束CT(cone beam computerized tomography,CBCT),通过Invivo5牙科软件三维重建,分别测量扩弓前后上颌第一磨牙、第一前磨牙冠状位硬腭水平基骨宽度、颊侧牙弓宽度、双侧牙槽骨倾斜角度的交角、双侧牙齿倾斜角度的交角,轴位颊、舌侧骨质厚度。扩弓前后数据采用SPSS 17.0统计软件进行分析。结果冠状位:Hyrax快速扩弓与Hyrax慢速扩弓在骨性开展和牙弓总宽度变化上无差别,扩弓后牙弓总宽度增加,第一前磨牙平面的骨开展量大于第一磨牙平面,牙齿和牙槽嵴颊向倾斜,牙槽嵴倾斜的角度慢速扩弓组大于快速扩弓组,牙齿倾斜的角度快速扩弓组大于慢速扩弓组;轴位:颊侧骨质厚度减少,舌侧骨质厚度增加,但Hyrax慢速扩弓组颊侧的减少量小于Hyrax快速扩弓组,两组差异有统计学意义(P<0.05)。结论对于替牙晚期患者,与Hyrax快速扩弓相比,Hyrax慢速扩弓慢速轻力的特点更符合生理特性,并且对颊侧的骨质厚度影响小,是一种有效的扩弓方式。
Objective To compare the curative effect of Hyrax rapid and slow expansion on the treatment of late maxillary stenosis. Methods Sixty patients with late maxillary base stenosis of orthodontics treated in Dalian Stomatological Hospital from January 2011 to December 2012 were randomly divided into two groups: Hyrax rapid expansion and Hyrax slow expansion Coronary beam computerized tomography (CBCT) was performed before and after correction and expansion. The Invivo5 dental software was used to reconstruct the maxillary first molar, the horizontal bone width of the coronal palatal first premolars and the buccal Dental arch width, bilateral alveolar bone angle of inclination, bilateral angle of inclination angle of teeth, axial cheek, lingual bone thickness. Data before and after augmentation were analyzed by SPSS 17.0 statistical software. Results Coronal: Hyrax rapid expansion and Hyrax slow expansion in the bony development and changes in the total width of the dental arch no difference after arch expansion of the total width of the arch, the first premolar plane bone is greater than the amount of the first molar In the plane, the teeth and alveolar cheeks tilt, the angle of the alveolar ridge slow expansion group is larger than the rapid expansion group, the angle of rapid tooth expansion group is larger than the slow expansion group; axial position: the buccal bone The decrease of thickness and the increase of lingual bone thickness, however, the reduction in buccal side of Hyrax slow expansion group was smaller than that of Hyrax rapid expansion group. There was significant difference between the two groups (P <0.05). Conclusions For patients with advanced tooth replacement, compared with Hyrax rapid expansion, Hyrax slow expansion of the characteristics of light and slow expansion more in line with physiological characteristics, and the impact on the buccal bone thickness is small, is an effective method of expansion .