摘要目的 通过观察Tip-Edge Plus直丝弓技术矫治的Ⅱ类错(牙合)患者颅面、牙(牙合)的特征性改变,探讨该技术的矫治要点.方法 应用Tip-Edge Plus直丝弓技术矫治12例(女性7例,男性5例,平均14.3岁)Ⅱ类错袷双颌或上颌前突患者.所有患者均拔除4颗第一前磨牙,按照Tip-Edge Plus 直丝弓技术矫治程序进行矫治,矫治前后行X线头影测量分析.结果 与矫治前相比,矫治后患者软组织侧貌改善明显,鼻唇角增大17.22°(P<0.01);上、下唇突距分别减少4.57 mm、3.72 mm(P<0.01);上、下切牙显著内收,突度分别减小4.73 mm、1.89mm(P<0.05).依靠口内支抗,矫治前后上颌支抗磨牙的移动仅为0.89 mm(P>0.05).结论 Tip-Edge Plus直丝弓技术利用口内支抗、细丝轻力,快速倾斜移动牙齿后简捷、准确转距并正轴的方法 ,可有效矫治Ⅱ类错(牙合)双颌或上颌前突患者.

abstractsObjective To evaluate the craniofacial and occlusional changes of Class Ⅱ patients treated with Tip-Edge Plus technique.Methods Twelve Class Ⅱ patients(7 girls and 5 boys,mean age 14.3 years)with bimaxillary or maxillary protrusion were selected.All the patients were four first premolar extraction cases and treated with Tip-Edge Plus technique.Cephalometric analysis Was performed to evaluate the changes before and after treatment.Results After treatment,the profile Was greally improved.UL-E,LL-E were decreased significantly(P<0.01)and incisors were retracted(P<0.05).Upper molars noved forward slightly(P>0.05).Conclusions The anchorage control in Tip-Edge Plus technique was effective without extraoral force,palatal arch and implants.Under very light force,the crown of anterior teeth tipped distally and lingually quickly.In the final stage,it was possible to achieve both desired root uprighting and crown torque.