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1、口腔解剖生理学0201（Oralanatomyphysiology0201）Section1dentitionTheupperandlowerjawteetharearrangedinacertainorder,directionandposition.Therootofthetoothisgrowninthesocketofthealveolar,andthecrownofthetoothisarrangedinanapproximateparabolicarch,whichisknownasthetootharchorthetoothcolumn.Themandibleiscalledt
2、heuppertoothcolumn,andthemandibleiscalledthelowertoothcolumn.(I)theshapeoftheteeth,thecharacteristicsoftheteethandthephysiologicalsignificanceoftheteeth1.Themorphologyoftheteethisnotexactlythesameintheshapeofthearch,butitcanbebroadlydividedintothreebasictypes:fangyuan,ovoidandcircularshape.Butthere
3、areusuallythreebasictypesofmixed.(1)measurementofthelengthofthetootharch:thelineofcontactpointsbetweenthecontactpointsofthesecondpermanentmolarsoftheleftandrightisthebottomline,andtheverticallineofthecontactpointofthemiddleincisorsisthetotallengthofthearchofthetooth.(2)measurementofthewidthofthearc
4、hofthetooth:thewidestdistancebetweentheleftandrightsecondmolarcheeks.Accordingtotheresultsofdomesticstudies,thelengthandwidthoftheupperandlowerpermanentdentitionarepositivelycorrelated.Themaxillaryteethareabout55mmwideandabout50mmlong.Themandibularteethareabout52mminwidthandabout41mminlength.2.Thet
5、oothalignmentfeatures,thepositionofthetoothinthetoothgroovearenotallvertical,butsometeetharestraight,someteethhaveacertaininclination.Thetiltofthecrownisusuallyindicatedbythetiltofthecrown.Theinclinationofthetoothhastwodirections:thedirectionofthedistalandthetongueofthelips(buccal).(1)theinclinatio
6、nruleofthetoothinthenearandfardirectionofthetooth:thesmallAngleoftheAngleofthetoothlengthaxisandthemiddlelineoftheteethissmall;ThegreatertheAngle,thegreatertheinclinationofthetooth.Eachtoothnearlyfartotiltisroughlyasfollows:inthemaxillaryincisorisorslightlyXiangJinZhongtilt,maxillarylateralincisorX
7、iangJinZhongAnglecuttingtheteethandtheteethinalarge,maxillaryteethslightlyXiangJinZhongtilt(incisoroftiltAngleislarger,butslightlysmallerthanlateralincisor).Inthelowerjaw,theincisorsweremorepositive,thelate
