摘要:
目的 通过细丝弓技术在高角安氏Ⅱ类1分类拔牙患者直丝弓矫治中的应用,探讨其矫治前后软硬组织的变化,为临床正畸设计和矫治提供参考.方法 本研究采用回顾性的研究方法,以符合纳入标准的17例正畸患者为研究对象矫治前后拍摄头颅侧位定位片,对头影测量结果应用SPSS15.0软件进行统计分析.结果 17例高角安氏Ⅱ类1分类错(牙合)患者矫治结束后,磨牙和尖牙关系中性,覆(牙合)覆盖正常.正畸治疗后矢状向ANB角减小1.18°,U1-NA角减小19.13°,L1-NB角减小6.42°,L1-MP角减小5.28°,颏突度增加0.46mm,颏倾斜度减小3.99°,有统计学意义.垂直向OP-MP角减小0.19°,L6-MP距增加0.98 mm,有统计学意义,而上、下颌切牙和上磨牙垂直变化无统计学意义.矫治后软组织侧貌明显改善,面型角减小4.56°,鼻唇角增加16.48°,上、下唇突点距离审美平面减小4.93 mm和3.99 mm,PosB’-FH角增加6.88°,有统计学意义.结论 高角安氏Ⅱ类1分类患者拔除四颗第一双尖牙,采用直丝弓矫治器矫治,矫治过程中应用细丝弓矫治技术可以对患者矢状向和垂直向达到良好的支抗控制,矫治后软组织侧貌明显改善.%Objective To investigate the soft and hard tissue changes in Class Ⅱ Division 1 high angle extraction cases treated by light archwire technique with straight archwire appliance.Methods Seventeen Class Ⅱ Division 1 patients with high angle who met the including criteria were included into this retrospective study.Cephalometrics of pre and post treatment lateral films were traced by hands and its statistical analysis was performed via SPSS 15.0 software package.Results After treatment of the seventeen subjects,molar and cuspid relationships were Class Ⅰ and normal overjet and overbite were established.ANB and U1-NA decreased by 1.18°and 19.13°respectively.L1-NB and L1-MP decreased by 6.42° and 5.28°.OP-MP and tilt angle of chin decreased by 0.19°and 3.99°.Prominence of chin increased by 0.46 mm.L6-MP increased by 0.98mm.These changes were statistical significant.However,vertical changes for incisors and upper molar showed no significant changes.Remarkable soft tissue change was noted after orthodontic treatment.FCA decreased by 4.56° and NLA increased by 16.48°.The prominence of upper and lower lips to aesthetic plane decrease by 4.93 mmand 3.99 mm.PosB'-FH increased by 6.88°.These changes showed statistical significance.Conclusions The Class Ⅱ Division 1 patients who were treated by light archwire technique with straight archwire appliance could get good control of the vertical dimension in high angle cases after four first premolars extraction and the profile could be improved significantly.