利用直丝弓托槽改换打开咬合方法初探

Study of opening bite in treatment of straight wire bracket change

目的观察利用直丝弓托槽改换打开咬合患者的牙齿改变,探讨该技术特点。方法 7例Ⅱ类错患者均拔除4颗前磨牙,按照改换技术进行矫治,矫治前及打开咬合后行牙齿及X线头影测量分析。结果与矫治前相比,患者覆减少6.00 mm,拔牙间隙减少24.14 mm,上颌支抗磨牙近中移动仅为0.86 mm,差异有统计学意义(P<0.05)。结论直丝弓托槽改换利用口内支抗,快速打开咬合、减少拔牙间隙,结合细丝弓和直丝弓技术优点,可有效矫治Ⅱ类错患者。

Objective To evaluate the patient occlusional changes treated with change of the straight wire bracket technology. Methods Seven Class Ⅱ patients with bimaxillary or maxillary protrusion were selected. All the patients were four premolar extraction cases and treated with change the straight wire bracket technology. Cephalometric analysis was performed to evaluate the changes before and after treatment. Results After treatment,patient occlusion opened 6. 00 mm,tooth clearance decreased 24. 14 mm,and upper molars moved forward slightly; all the differences were statistically significant( P < 0. 05). Conclusion The anchorage control in change the straight wire bracket technology is effective. Under very light force,the crown of anterior teeth tips distally and lingually quickly,and the extraction space closes quickly. In the final stage,it is possible to achieve both desired root uprighting and crown torque.