tweed-merrifield定向力矫治技术用于成人安氏ⅲs类错（牙合）畸开的拔牙矫治

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1、大连医科大学硕士学位论文关键词：Tweed技术安氏IIl8类错骀唇部美观．2．大连医科大学硕士学位论文ApplyingTweed-MerrifieldDirectionalForceTechniqueinadultwithAngleClassHIsmalocclusionbyextractingfourpremolarsNameofPostGraduateStudent：dangYanjunNameofSupervisor：ProfessorSunYanMajor：OrthodonticsandDentofacialOrthopaedicsAbs

2、tractObjectives：AssesstheeffectonadultpatientwithAngleclassIIIsmalocclusionbyextractingfourpremolarsandapplyingTweed-MerrifieldDirectionalForceTechniquetorefractanteriorteeth．Toevaluatethechangesbetweenthelipsandteeth，aswellastheeffectonthelipaesthetic．MaterialsandMethods：AnA

3、noeclassIIIsfemalecasewasselectedfromDalianOrthoClincinMarch2012，whoWas22yearsold，convexprofile，upperandlowermoderatecrowdingandanteriorteethonedge，maxillarymidlineshifttotheleft．Throughthepatient’Soralexamination，modelanalysisandcephalometricanalysis，thepatientwastreatedbyex

4、tracting15、24、4、44、t8、28、38、48andapplyingTweedTechnique．X·raywastakenpre-treatmentandaweekbeforecompletionoftreatment，measurementsfromTweedanalysis，measurementsofsofttissueassociated、杭tllthelipsandsuperimpositionofpre—andpost-treatmentwereusedtoobservethechanges．Results：After

5、21months，thetreatmentwasfinished．Preandpost-treatmentchangesshowed：crowdingwasrelieved，classIIIsmolarrelationshipWaschangedtoclassI，normaloverbiteandoverjetwereachieved，profilewasimproved，upperandlowerdentitionmidlinewascenteredandsymmetric．Aftertreatment，panoramicradiographs

6、howthatrootsaresubstantiallyparallelandshownosignificantabsorption，alveolarboneandperiodontaltissueareingoodhealth，condylesaresymmetric．Mandiblewasrotatedcounterclockwise，mandibularplaneanglewasdecreased(FMAdecreasedfrom300to280)．Loweranteriorteethwasretractedanduprighted(IMP

7、A95odecreased82。)．Obviousimprovementoftheprofile(ZANGLE-3一大连医科大学硕士学位论文66。increased75。；Li-Hlinechangesfrom3mmto0mm)．Lipmorphologyofpatientisinharmony,patientandparentsaresatisfiedwiththeresults．Conclusion：ForthetreatmentofadultpatientwithAngleclassHIsbyextractingfourpremolars，

8、applyingTweed-MerrifieldDirectionalForceTechniquetoretractanteriorte