安氏Ⅱ类2分类错（牙合）畸形非拔牙矫治牙颌结构变化的分析

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1、往本精久学硕士学嵌论文均伸长了0．18mm。2x4矫治技术组上颌磨牙伸长0．9lmm，而传统治疗组上颌磨牙伸长1．85mm。2x4矫治技术组上颁磨牙根尖在治疗后向近中移动O．69mm，而传统治疗组则为上颌磨牙根尖向远中移动O．96mm。两组差异有显著性。2．将2×4矫治技术组与传统治疗组中差别无统计学意义的测量项目(共20项)进行合并计算，结果显示：1)上颌齿槽的变化：A点后移0．51mm。2)上切牙的变化：切缘平均前移5．57mm。上切牙根尖向后移动2．02ram，向下移动平均1．18mm。上颌切牙治疗前后成角平均20．03。表明上切牙冠向唇侧移动、根向腭侧移动相一致。3)上磨牙的变化

2、：上颌磨牙治疗后有少量伸长，水平向变化不大，治疗前后上颌磨牙成角2．7l。。4)颌齿槽的变化：治疗后B点平均上移O．96mm和后移O．62mm。5)下切牙变化：治疗后下切牙牙冠平均前移5．19mm，根尖向后平均移动2．01mm，治疗前后下切牙成角平均20．42。，说明下切牙牙冠唇移，根尖舌移。下切牙牙根殆向移位1．41mm。6)下磨牙的变化：治疗后下磨牙平均升高2．07mm。在前后向，下颌磨牙发生近中移动，牙冠向近中移动O．85mm，牙根向近中移动2．58mm。与此同时下颌磨牙成角2．8。(L6=2．8)。[关键词]安氏II类2分类非拔牙矫治结构重叠2×4往冬强人学硕七学托论’支ABST

3、RACTThedentoalveolarchangesfollwoingnon—extractiontreatmentofAngleClassIIdivision2malocclusionAngleClassIIdivision2malocclusionischaracterizedbymolardistalrelationshipandanteriorteethclosedbite．Itisveryimportanttomakefurtherresearchonitbecauseofitsspecificdentoalveolarcharacteristics，andthebadeff

4、ectsonTMJandotheroralfunctions，aswellasthespecialaspectsoftreatment．Totally20patientsofAngleClassIIdivision2malocclusiontreatedwithoutextractionofteethwereanalyzedcephalomecriclly．Changesofmaxillomandibularpositionandsofttissueprofilewerecomparedbetweenthe2x4groupandtheregulargroups．Alltheresults

5、areasfollowings：1．Sagittally,SNAangleisdecreasedsomeamount，whileSNBandSNPareincreaseda1ittle．2．ANBangleisdecreasedfrom5．480to4．56。．3．Mandibularplaneangleisincreased，andnobigchangeshappenedvertically．4．Thedistancefromlowerliptoestheticplaneisincreasedby1．35mmaveragelyfollowingtreatment．5．Thedistsa

6、nceofStomtoupperincisoredgeisdecreasednotelyfrom4．85mmto2．98mm．Inordertoeliminatetheinfluenceofgrowthanddevelopmentofjaws，thestructuresuperpositionmethodwasusedtocomparethedentoalveolarchangeoftreatment．1．In2×4treatmentgroup，upperincisorhasbeenintrudedby1．24mm，whileupperincisorhasbeenextrudedby0．

7、18raminregulartreatmentgroup．In2×4treatmentgroup，theapexofupperfirstmolarismesiallymovedby0．69mm，whilemoveddistallyby0．96mminregulargroup．2．Alltheitemsinthesetwogroupswithoutsignificantdifferencearecombinedtogether(tot