目的 评价应用双颌(牙合)垫结合前方牵引及Ⅲ类颌间牵引治疗替牙期安氏Ⅲ类错(牙合)畸形的疗效.方法 选择徐州市口腔医院正畸科2015年7月至2016年3月收治的替牙期安氏Ⅲ类错(牙合)畸形患者18例(其中男8例,女10例;平均年龄9.2岁),上、下颌分别制作(牙合)垫,上颌前方牵引配合Ⅲ类颌间牵引.用X线头影测量观察矫治前后的面部软硬组织变化.结果 18例患者治疗后前牙反(牙合)解除,治疗后SNA角(蝶鞍中心、鼻根点及上齿槽座点所构成的角)、ANB角(上齿槽座点、鼻根点与下齿槽座点构成的角)、NA-PA(颌凸角)、ANS-Ptm(上颌长)、N-ANS(上面高)、U1-SN角(上中切牙长轴与前颅底平面相交的下内角)、U1-NA角(上中切牙长轴与鼻根点-上齿槽座点连线的交角)、U 1-NA距(上中切牙切缘至鼻根点-上齿槽座点连线的垂直距离)、FCA(面型角)、ULP(上唇突度)等指标的值增大,差异有统计学意义(P＜0.05);SNB角(蝶鞍中心、鼻根点及下齿槽座点所构成的角)、NP-FH(面角)、L1-MP角(下中切牙长轴与下颌平面相交之上内角)、L1-NB角(下中切牙长轴与鼻根点-下齿槽座点连线的交角)、LLP(下唇突度)等指标的值减小,差异有统计学意义(P＜0.05).结论 双颌(牙合)垫结合前方牵引及Ⅲ类颌间牵引治疗替牙期安氏Ⅲ类错(牙合)效果肯定,患者依从性好.%Objective To evaluate the treatment for the class Ⅲ malocclusion of mixed dentition with bimaxillary bite plate combined with protraction and class Ⅲ traction.Methods Totally 18 mixed dentition patients with class Ⅲ malocclusion were collected (8 males,10 females,mean age:9.2 years).Bite plates were made in both upper and lower arch,using maxillary protraction and class Ⅲ traction.Hard and soft tissue changes of face were measured on cephalograms before and after treatment.Results Crossbite of 18 patients were corrected.After treatment,SNA,ANB,NA-PA,ANS-Ptm,N-ANS,U1-SN,U1-NA (°),U1-NA (mm),FCA and ULP increased,while SNB,NP-FH,L1-MP,L1-N B (°) and LLP decreased,all having statistically differences (P ＜ 0.05).Conclusion Bimaxillary bite plate combined with protraction and class Ⅲ traction is an effective method in treating class Ⅲ malocclusion of mixed dentition and the patients compliance is good.
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