摘要
目的:探讨成人安氏Ⅱ类2分类错牙合颌间Ⅱ类牵引矫治的机制。方法:选取Ⅱ类牵引方法治疗安氏II类2分类错牙合患者12例,对治疗前后的X线头影测量结果进行分析比较。结果:治疗后,上下中切牙唇倾,下颌磨牙前移,下颌平面下旋、上齿槽座点矢状向后移,下颌体部长度不变,下颌总长度增加;Cond-Go、SGo增大,ANB减小;SNB的变化不同个体存在差异,大部分患者(7/12)增大,部分患者(5/12)减小。NSar、S-E治疗前后无显著变化。SNB与ML NSL治疗前后差值间存在显著负相关(r=-0.899)。结论:大部分患者Ⅱ类错牙合的纠正主要是下颌牙列前移的结果;而部分患者是下颌骨和下颌牙列前移联合作用的结果;下颌骨的前移伴随着髁突的增生改建而完成,髁突位置治疗后基本不变。控制下颌平面的下旋,有利于Ⅱ类错牙合的纠正。
Objective：To investigate the mechanism of correction of ClassⅡmalocclusions in adult ClassⅡdivision 2 malocclusions treated with Class Ⅱ elastics. Method：The lateral cephalometric radiographs of 12 patients before and af-ter treatment were measured by Onyx 2.6 software. Result：After treatment, Max1-NSL,Mand1-ML,ML NSL,mandibular length、N-Me increased（P﹤0.01）. A6L＇-Pog＇、U1-L1、SNA、Max.base decreased（P﹤0.01）. And Cond-Go、SGo increased （P﹤0.05）. ANB、S-Go：N-Me decreased（P﹤0.05）. The differences of other cephalometric variables were not significant. The changes of SNB with treatment existed remarkable difference among individuals,which decreased in the 7of 12 sub-jects,and increased in other 5 subjects. A significant inverse correlation between the changes of SNB and ML NSL with treatment was found （r=-0.899）. Conclusion：According to the correction of Class Ⅱ malocclusions, mandibular dentition advancement played a leading role in most patients;but in some patients,it is a result of combined action of lower jaw ad-vancement and mandibular dentition advancement. However the location of condyle remained unchanged, mandibular ad-vancement was accompanied by adaptive remodeling of condyle.
出处
《临床口腔医学杂志》
2015年第4期234-236,共3页
Journal of Clinical Stomatology
基金
上海市徐汇区医学科研课题青年项目(区SHXH201331)
