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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 clinical efficacy of oriental preadjusted appliance-KOSAKA (OPA-K) straight wire appliance in treatment of Class Ⅱ division 1 malocclusion with single jaw reduction and to explore its mechanism and application. Methods A total of 28 patients with Class Ⅱ 1 malocclusion were selected from 17 to 26 years old. The patients were treated with OPA-K straight wire appliance for single jaw reduction. The changes of X-cephalometry before and after treatment were analyzed. Results In the sagittal direction, the U1-NA and U1-SN decreased by 16.93 ° and 7.06 °, respectively, while the U1-NA decreased by 3.83 mm. The U1-L1 increased by 12.94 ° and the values of L1-NB and L1-MP increased by 2.78 (P <0.05). However, the changes of SNA, SNB and ANB showed no significant difference (P> 0.05). In the vertical direction, SN-MP and Y-axis changes were not significant (P> 0.05). Conclusion OPA-K straight wire appliance single jaw reduction treatment of Class Ⅱ 1 malocclusion can achieve satisfactory clinical results.