摘要
目的:评价采用上颌快速扩弓技术与下颌后牙后倾技术相结合的非减数治疗模式治疗青少年安氏Ⅲ类错边缘病例患者后所引发的牙骨性及软组织侧貌的改变。方法:收集9例符合安氏Ⅲ类错边缘病例特征的青少年患者,平均年龄13.4岁,上颌平均拥挤度为(6.7±2.8)mm,下颌平均拥挤度为(2.6±0.4)mm。采用Hyrax上颌快速扩弓装置及固定矫正装置予以治疗。治疗前、后进行X线头影测量分析,使用SPSS11.0软件包对数据进行配对t检验。结果:治疗前后比较,SNA增大1°,A点前移1.69mm,SNB减小0.69°,B点后退1.88mm,两者相结合,导致ANB增大1.69°(P<0.05);下颌平面下旋1.50°,Y轴角增大0.88°,表明下颌出现下旋(P<0.05);上切牙唇倾度增加4.75°(P<0.05),下切牙唇倾度无明显变化;鼻唇角无明显变化,上唇位置前移1.00mm(P<0.05),下唇位置后退0.63mm,使得上、下唇突度的差异度减小(P<0.05)。结论:该治疗模式有利于患者矢状向骨性关系及上、下唇关系的改善。
PURPOSE： To evaluate the effect of non-extraction treatment protocol combined with rapid palatal expansion and lower molar distalization in borderline Class Ⅲ malocclusion in adolescents.METHODS： Nine borderline Class Ⅲ patients（average age： 13.4±0.7 years） with average（6.7±2.8）mm crowding in maxilla and（2.6±0.4） mm crowding in mandible received the treatment described above.The lateral cephalograms of these patients were analyzed.All patients had a pretreatment ANB angle greater than-3°.The difference before and after treatment was analyzed with paired t test using SPSS11.0 software package.RESULTS： Evaluation of cephalometric measurements revealed forward movement of the maxilla,indicated by 1.69mm forward positioning of A-point（P﹤0.05）,and an increase in SNA by 1°（P=0.054）.The mandible was inhibited from growing forward with slight retrusion evidenced by a decreased B-point（-1.88mm,P﹤0.05）,and a decrease in SNB by 0.69°（P﹤0.05）.The combined maxillary and mandibular changes resulted in an increase in ANB angle（1.69°,P﹤0.05）.A clockwise rotation of the mandible was found,with an increase in Y-axis（0.88°,P﹤0.05） and SN-MP（1.50°,P﹤0.05）.Significant change was also found in the forward movement of maxillary incisors（＋3.44mm,P﹤0.05）,and the slight retrusive positioning of mandibular incisors（-0.5mm,P﹤0.05）.An increase in U1-SnPg＇（1mm,P﹤0.05） and a decrease in L1-SnPg＇（0.63mm,P﹤0.05） resulted in the improvement of upper and lower lips relationship（1.88mm,P﹤0.05）.CONCLUSION： This treatment protocol can improve the sagittal jaws and upper-lower lip relationship.
出处
《上海口腔医学》
CAS
CSCD
2011年第1期82-87,共6页
Shanghai Journal of Stomatology
关键词
安氏Ⅲ类错(牙合)
边缘病例
快速扩弓
磨牙后倾
Class Ⅲ malocclusion
Borderline cases
Rapid palatal expansion
Molar distolization
