应用OPA-K直丝弓矫治器单颌减数治疗安氏Ⅱ~1类错的临床研究

Clinical study of oriental preadjusted appliance-KOSAKA applied in treatment of Angle class Ⅱ division 1 malocclusion with single maxillary extraction

目的评价oriental preadjusted appliance-KOSAKA(OPA-K)直丝弓矫治器单颌减数治疗安氏Ⅱ1类错的临床疗效,并探讨其机制和使用方法。方法临床选择17～26岁安氏Ⅱ1类错患者28例,应用OPA-K直丝弓矫治器进行单颌减数治疗,并对治疗前后X线头影测量值的变化进行分析。结果矢状方向上,U1-NA和U1-SN分别减小16.93°和7.06°,U1-NA(mm)减小3.83 mm,U1-L1增加12.94°,L1-NB和L1-MP分别增加2.78°和4.62°,L1-NB(mm)增加1.50 mm,以上差异均具有统计学意义(P<0.05);而SNA、SNB、ANB的变化均无显著性(P>0.05)。垂直方向上,SN-MP和Y轴的变化均无显著性(P>0.05)。结论应用OPA-K直丝弓矫治器单颌减数治疗安氏Ⅱ1类错可取得令人满意的临床效果。

Objective To evaluate the effects of the oriental preadjusted applianceKOSAKA applied in treatment of monomaxillary Angle class Ⅱdivision 1 malocclusion with single maxillary extraction and discuss the mechanism and application. Methods 28 ca ses at the age of 1726 years old with Angle class Ⅱdivision 1 malocclusion were chosen and treated with the oriental preadjusted ap plianceKOSAKA and with single maxillary extraction. Cephalometric analysis was performed before and after the treatment. Results In the sagittal direction, U1NA and U1SN were reduced by 16.93 °and 7.06°, U1NA（ram） was reduced by 3.83 mm, U1L1 was in creased by 12.94° ,L1NB and L1MP were increased by 2.78° and 4.62°,L1NB（ram） were increased by 1.50 mm,and there were significant differences in these changes （P 〈 0.05 ）, but the changes of SNA, SNB, ANB were no significant （P 〉 0.05 ）. In the vertical direction, the changes of SNMP and Y axis were not significant （ P 〉 0.05 ）. Conclusions The oriental preadjusted applianceKOSA KA can achieve satifvin clinical effects for treatment of Anzle class Ⅱ division 1 malocclusion with sine maxillarv extraction.