不同支抗条件下成人安氏Ⅱ类1分类高角病例治疗前后平面变化的比较研究

The occlusion plane changes of the adults with Angle class Ⅱ division 1 hyperdivergent malocclusion treated by different anchorages

目的:研究成人安氏Ⅱ类1分类高角病例拔除4个第一前磨牙并分别应用微种植体支抗和传统支抗矫治后其平面和下颌平面的变化。方法:选取诊断为安氏Ⅱ类1分类高角并通过拔除4个第一前磨牙矫治后的患者40例,年龄18~30岁;微种植钉支抗组(G1)和传统支抗组(G2)各20例;收集两组患者矫治前后的头颅侧位片并对其进行测量分析。结果:G1组矫治前后相比:G1组矫治前后,U1-PP压低了(0.62±0.62)mm(P<0.05),SNA角减小了(0.93±1.09)°(P<0.05)。G2组矫治前后相比:U1-PP伸长(0.94±1.27)mm(P<0.05),U6-PP伸长了(1.41±1.00)mm(P<0.05),U6-SV近中移动了(2.56±1.46)mm(P<0.05),OP-SN角增加了(2.40±1.48)°(P<0.05),SNA角减小了(0.85±0.74)°(P<0.05),SNB角减小了(1.23±0.88)°(P<0.05),Y轴角增加了(1.20±1.36)°(P<0.05),下颌平面角(MP-SN、Go Gn-SN)分别增加了(1.18±1.03)°、(1.00±0.99)°(P<0.05)。其他测量项目治疗前后相比均无统计学差异(P>0.05)。结论:成人安氏Ⅱ类1分类高角通过拔除4个第一前磨牙进行治疗的患者利用微种植钉支抗关闭拔牙间隙时,对颌平面及下颌平面的控制与传统支抗相比具有明显的优势。

AIM： To investigate the occlusion plane changes and the mandibular plane angle changes in the adults with Angle class Ⅱ division 1 hyperdivergent malocclusion treated by different anchorages. METHODS ： 40 patients （aged 18-30 years） with Angle class Ⅱ division 1 hyperdivergent malocclusion had the 4 1st premolars extracted and were treated with mini - implant anchorage （ Group 1 , n =20） and conventional anchorage （ Group 2 , n=2Q） respectively. Pre - treatment and post - treatment cephalograms were collected and related indexes were meas-ured, data were analyzed. RESULTS： After treatment,in group 1 ： U1 - PP was intruded by （ 0. 62 ± 0. 62 ） mm （P 〈 0. 05） , SNA decreased by（0. 93 ± 1.09） ° （ P 〈 0. 05 ） . In group 2： the U1 - PP was extruded by（0.94 ± 1.27） mm （P 〈0.05）,the U6 -PP extruded by（1.41 ± 1.00） mm （P 〈0.05）,the U6 - SV mesially moved by （2.56 ± 1.46） mm （P〈0.05）, SNA decreased by （0.85 ±0. 74）°（P 〈0.05） , SNB decreased by （1.23 ±0. 88）°（P 〈0. 05） , the OP - SN angle increased by （2.40 ± 1.48） °（P 〈0.05） , Y angle increased by （1.20 ± 1. 36） ° （P 〈0.05） , MP - SN and GoGn -SN were increased by （0.08 ±0.08）〇 and （0.03 ±0.94）〇 respectively （P 〈0 .05 ）. The change of other indexes was not statis-tically defferent. CONCLUSION ： Mini - implants anchorage is more effective than traitional ancohorage in the control of the occlusion plane and the mandibular plane for the treatment of adults with Angle class Ⅱ division 1 hyperdivergent maloc-clusion.