【作者】 郑雪飞；

【导师】 吴佩玲；

【作者基本信息】 新疆医科大学 ， 口腔临床医学， 2007， 硕士

【摘要】 目的:通过对26例安氏Ⅱ~1错(牙合)拔除四颗第一前磨牙固定矫治患者的X线头颅侧位定位片的测量,进行矫治前后软硬组织变化的比较,探讨该治疗对软硬组织的改变以及对矫治的效果进行量化,以期为临床制定矫治计划和预后评估提供一定参考。方法:选取26例安氏Ⅱ~1错(牙合)患者作为研究对象,其平均年龄12.08±2.03岁。患者均接受了正畸治疗,过程包括均拔除四颗第一前磨牙进行固定矫治,并配合Ⅱ类颌间牵引。矫治前后均拍摄X线头颅侧位定位片,进行头影测量分析,并采用SPSS12.0统计软件包对测量结果进行统计学分析。结果:(1)矫治后颌骨SNA角减少了1.59°,差异有统计学意义(P＜0.05);SNB角增加了0.88°,差异无统计学意义(P＞0.05)。ANB值减小了1.61°,差异有统计学意义(P＜0.05)。(2)矫治后牙性变化为U1-NA角、U1-NA距,U1-SN角分别减小了6.42°,3.7mm和7.13°,且均具有统计学意义(P＜0.05)。(3)矫治后软组织侧貌发生了改善,软组织面凸角治疗后缩小了1.89°,鼻唇角增加了4.76°,上唇—E平面减小了1.98mm,上唇凸厚增加了2.35mm,差异均有统计学意义(P＜0.05)。结论:对于安氏Ⅱ~1错(牙合)拔除四颗第一前磨牙进行固定矫治的治疗方法:(1)治疗前后的测量结果经比较,存在统计学差异的数值包括SNA、ANB、N-Me、U1-SN、U1-NA角、U1-NA距、面凸角、鼻唇角、上唇—E平面、上唇凸厚。(2)该治疗可通过部分骨骼作用、牙齿的移动及软组织的代偿作用使软组织侧貌面型在一定程度上得到改善。(3)颌骨及颌骨间关系改变较少。(4)该治疗可改善软组织侧貌,但有一定限度。故矫治前应进行准确的错(牙合)诊断、正确的矫治设计及客观的预后评估,才能取得良好的侧貌改善。更多还原

【Abstract】 Objectives:The aims of this study were to determine the changes in the dentofacial structures of ClassⅡdivision 1 patients after orthodontics treatment with extraction of four first premolars,and to compare pre- with post-treatment values. Methods:The ClassⅡdivision 1 subjects included 11 males and 14 females(mean age: 12.08±2.03 years).All received comprehensive orthodontic treatment with extraction of four first premolars,including using a fixed appliance and classⅡelastics.Lateral cephalograms were taken at the beginning and end of treatment.Twenty-five(12 linear and 13 angular)measurements were measured on each radiograph.All data were analyzed by SPSS 12.0 software.Results:Compared with pre- and post-treatment measurements,statistically significant differences were found for ten of 25 measurements.They are:SNA、ANB、N-Me、U1-SN、U1-NA°、U1-NA、Ns-Sn-Pg、Cm-Sn-UL、UL-E plane、UL-UI.Conclusions:The findings demonstrates that camouflage treatment in ClassⅡ~1 subjects has characteristic skeletal,dental and soft tissue effects on the dentofacial complex.(1)Through orthodontics treatment with tooth extraction,the teeth is moved and some skeletal changes,the soft facial tape and lip form are improved significantly;(2)Orthodontic treatment can improve the soft profile,but it has a limit.(3)To ClassⅡdivision 1 patients,the upper incisor should not be so excessively retracted that the upper lip appears to be over upright.(4)some skeletal changes slightly,while soft tissue and tooth change obviously.更多还原