CAJ | 학술논문

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。
목적：탐토성인안씨Ⅱ류2분류착아합합간Ⅱ류견인교치적궤제。방법：선취Ⅱ류견인방법치료안씨II류2분류착아합환자12례，대치료전후적X선두영측량결과진행분석비교。결과：치료후，상하중절아진경，하합마아전이，하합평면하선、상치조좌점시상향후이，하합체부장도불변，하합총장도증가；Cond－Go、SGo증대，ANB감소；SNB적변화불동개체존재차이，대부분환자（7／12）증대，부분환자（5／12）감소。 NSar、S－E치료전후무현저변화。 SNB여ML NSL치료전후차치간존재현저부상관（r＝－0．899）。결론：대부분환자Ⅱ류착아합적규정주요시하합아렬전이적결과；이부분환자시하합골화하합아렬전이연합작용적결과；하합골적전이반수착과돌적증생개건이완성，과돌위치치료후기본불변。공제하합평면적하선，유리우Ⅱ류착아합적규정。
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.