错牙合患者后牙转矩与牙弓宽度的分析

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1、上海交通大学医学院七年制硕士学位论文THESTUDYOFTHETORQUEOFPOSTERIORTEETHANDARCHWIDTHONMALOCCLUSIONSABSTRACTOBJECTIVES:Thepurposeofthisstudyistoinvestigatethetorqueoftheposteriorteeth,thearchwidthandtheirrelationshipofthemalocclusionsbeforetreatment.METHODS:121casesofmal

2、occlusionswereselectedtoanalyzethetorqueoftheposteriorteethandthearchwidth.Thecastsweredividedintotoquenormal,smallandbiggroupsaccordingtotorquenormalvalueandonestandarddeviationoftheChinese.ThreegroupsweremeasuredandcomparedbasedongenderandAngle'scla

3、ssification.Thedistributivecharactersofthetorqueoffirstmolarandtotaltorquewerestudied.Thedifferenceofthearchwidthwascomparedbasedondifferentgroupsofthefirstmolar.AcorrelationanalysiswasappliedIII上海交通大学医学院七年制硕士学位论文betweenthetorqueandthearchwidthofthema

4、xillaryandmandibularfirstmolarseparately.RESULTS:1.Thereisnosignificantdivergencebetweengender(P>0.05).2.Accordingtothetorqueofthefirstmaxillarymolars,thenumberofthepatientsintorquenormalgroupwas50,andtherewere47patientsintorquesmallgroup,24patientsin

5、torquebiggroup.3.Accordingtothetorqueofthefirstmandibularmolars,thenumberofthepatientsintorquenormalgroupwas53,andtherewere34patientsintorquesmallandbiggroup.4.Accordingtothetotaltorqueofthemaxillarymolars,thenumberofthepatientsintorquenormalgroupwas5

6、4,andtherewere45patientsintorquesmallgroup,22patientsintorquebiggroup.5.Accordingtothetotaltorqueofthemandibularmolars,thenumberofthepatientsintorquenormalgroupwas66,andtherewere43patientsintorquesmallgroup,12patientsintorquebiggroup.6.Thearchwidthoft

7、hefirstmolarwasincreasedwiththeincreaseofthetorqueofthefirstmolar.7.Thetorqueofthefirstmolarswaspositivelycorrelatedwiththearchwidthofthefirstmolars.IV上海交通大学医学院七年制硕士学位论文CONCLUSION:Thereisnorelationshipbetweenthegenders.Thoughthenumberofthepatientsinto

8、rquenormalgroupwasmorethanthenumberofthepatientsintorquesmallgroupandbiggroup,thenumberwasfewerthanhalf.Thenumberofthepatientsintorquesmallgrouptookthesecondplace..Thetorqueofthefirstmolarswaspositivelycorrelatedwiththearchwidthofthefirstmolar