Twin-block矫治器治疗安氏Ⅱ类1分类错的软硬组织变化

Hard and soft tissue changes following the treatment of Class Ⅱ division 1 malocclusion using Twin-block appliance

目的探索安氏Ⅱ类1分类错畸形在应用Twin-block矫治器治疗后软硬组织侧貌的变化。方法将50例处于生长发育高峰前期或高峰期的安氏Ⅱ类1分类错患者分为2组,治疗组(27例)接受Twin-block矫治器治疗,对照组(23例)不进行治疗,随访观察。对2组治疗(观察)前后的X线头影测量数据进行统计学分析。结果软组织指标中治疗组Ls-E、Li-E、U1-Stms、Stms-Stmi、NsLs-FH、LsNsLi、LsNsPg’、H角减小;Sn-Stms、Stmi-Me’、Ns-Me’、Sn-Me’、NsLi-FH、NsPg’-FH、A’Ls-FH、B’Li-FH、LiB’Pg’、CmSnLs、GSnPg’、Z角增大,与对照组比较有统计学差异(P<0.05)。硬组织指标中治疗组SNB、L1-NB、IMPA增大;ANB、U1-SN、U1-NA、FMIA减小,与对照组比较有统计学差异(P<0.05)。结论 Twin-block矫治器可显著改善下颌后缩患者上下颌骨的矢状关系,促进面下1/3高度的生长,使软组织侧貌趋于直面型。

Objective To investigate the hard and soft tissue changes following the treatment of Class Ⅱ division 1 malocclusion using Twin-block appliance.Methods 50 Class Ⅱ division 1 malocclusion subjects whose hand-wrist radiographs were in FG-G stage were selected.One group（27 patients） was treated with Twin-block appliance,the other group（23 patients） was observed without treatment.The acquired data of cephalometric of two groups were analyzed statistically with SPSS 11.0.Results Soft tissue changes,Ls-E,Li-E,U1-Stms,Stms-Stmi,NsLs-FH,LsNsLi,LsNsPg＇,the angle of H decreased.Sn-Stms,Stmi-Me＇,Ns-Me＇,Sn-Me＇,NsLi-FH,NsPg＇-FH,A＇Ls-FH,B＇Li-FH,LiB＇Pg＇,CmSnLs,GSnPg＇,the angle of Z increased,there was statistically significant difference（P0.05）.Hard tissue changes,SNB,L1-NB,IMPA increased,ANB,U1-SN,U1-NA,FMIA decreased,there was statistically significant difference（P0.05）.Conclusion Sagittal relationship between upper-and lower-jaws is effectively improved after orthopedics with Twin-block appliance.Lower face height increases.Soft tissue profile tends to be straight-styled.