free-edge矫治技术应用分析

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1、Free．edge矫治技术应用研究ApplicationofFree—edgeSysteminOrthodonticTreatmentPostgraduate：XiaotaoGengTutor：Prof．JiaxingLiangAbstractObjective：Thepurposeofthisstudywastoexplorethedifferencesofthedento．skeletalandsofttissueprofilechangesbetweenFree-edgeandBeggapplianceinclassIIsubjects，andtoevaluatedento·skelet

2、alandsofttissuechangesinskeletalclassIIIsubjectsinpermanentdentitionwhohadthelowerthirdmolarsextractedandweretreatedwithFree-edgeappliance．Methods：21patientstreatedwithFree·edgeapplianceand20patientstreatedwithBeggappliancewereincludedinthestudy．EachpatienthadaclassIIdivision1malocclusionandhadthefo

3、urfirstpremolarextractedaspartofthetreatmentdesign．Cephalometricevaluationbeforeandaftertreatmentwerecomparedbothamongandbetweenthetwogroups．14patientsinpermanentdentitionwithskeletalClassIIImalocclusionhadtheirlowerthirdmolarsextractedandtreatedwithFree—edgeappliancewereincludedinthestudy．Cephalome

4、tricanalysiswasusedtoevaluatethechangesbeforeandaftertreatment．Result：1．ChangesinFree—edgegroup：NostatisticaldifferencewerefoundforitemsofSL,S-Ptm，Ptm-ANS，SNB，SN—MP，anteriorfacialheight(N-Me)，L1一MP(deg)，(S-Go／N—MO，L1-NB(deg)．ThelinearmeasurementsofU1一PP,U6一PPandL6-MP,andtheangularmeasurementsofOP—SN

5、，Zanglewereincreased(p<0．01)，whileSNA,L1一MP(mm)，U1一SN，Ls·E-line，Li-E-line，overbite，andoverjetwt：rereducedaftertreatment(P<0．oa)．ChangesinBeggtreatmentgroup：SuchitemsofOP—SN，U1-PP(mm)，4Free-edge矫治技术应用研究U6一PP．L6一MPwereincreased(p

6、measurementofSNB，MP-SN，and(S-Go／N-Me)didnotshowstatisticalsignificantdifference．Comparisonbetweengroups：NostatisticaldifferenceswerefoundbetweenchangesinFree—edgeandBeggtreatmentgroup．2．ChangesinskeletalclasslIIsubjectsbylowerthirdmolarsextractionandFree-edgeappliancestreatment：Nosignificantdifferen

7、cewerefoundinitemsofL6-PPdistance，mandibularplane(SN—MP)，posterior／anteriorfacialheightratio(S-Go／N—Me)，SNB，maxillaandmandiblelengthbeforeandaftertreatment．SNA,ANB，U1-SNangle、L1一MPdistance、U6-PPdistan