第1題DentalAnatomyandPhysiologymainlystudiesthenormalmorphologicalstructures,functionalactivitiesandclinicalapplicationsoftheoralcavity.

第1題TheaimofthecourseDentalAnatomyandPhysiologyistoexplaintheanatomiclayersandorganmorphologyoftheoralcavity,skull,faceandneck,toidentifytheirstructuralcharacteristics,andtomastertheruleoftheirfunctionalactivities,soastolayasolidfoundationforthestudyandpracticeoftheclinicalmedicinecoursesinstomatology.

第2題Thebasicmethodologyforthelearningofthiscourseinclude：AfocusonpracticeBbegoodatsummarizing

CconsolidatetheknowledgeDalloftheabove第3題Thebasicviewofthissubjectis:Atheviewofevolutionarydevelopment

BtheviewofintegrationbetweenformandfunctionCtheholisticviewofhumanbody

Dalloftheabove第4題Thebasiccontentofthissubjectis:

AanatomyandphysiologyofteethB

localanatomyoforalcavity,maxillofacialregionandneckCdentition,occlusionandjawpositionDoralfunction正確答案：ABCD第5題ThefourthMedicalUniversity,SichuanUniversity,PekingUniversity,ShanghaiJiaotongUniversityandWuhanUniversityhavemadegreatcontributionstothedevelopmentoforalanatomyandphysiologyinChina.

Unit1test第1題Practicequestions第1題Theshapeofteethevolvedfromisodonttoheterodont.第2題Thenumberofteethchangesfromlesstomore.

Practicequestions第1題

Clinicalcrownscanbelargerorsmallerthananatomicalcrowns.第2題Whichofthefollowingtissuescanbeseeninthelongitudinalsectionofthecrown:AenamelBdentinCpulpDcementum正確答案：ABCPracticequestions第1題Whichtoothpositiondoes24standfor?

AmaxillaryleftfirstpremolarBmaxillaryrightfirstpremolarCmandibularrightfirstpremolarDmandibularleftfirstpremolar第2題Whichtoothpositiondoes73standfor?AdeciduousmaxillaryleftcanineBmaxillaryrightcanineCdeciduousmandibularleftcanineDdeciduousmandibularrightcaninePracticequestions第1題

Whichofthefollowingdescriptionsofthephysiologicalcharacteristicsoftootheruptionisincorrect:

AEruptionhappensinacertainorderBTheleftandrightcounterpartsareinpairsanderuptatthesametimeCThemandibularteethprecedetheirmaxillarycounterpartsineruptionDThemandibularteethprecedetheirmaxillarycounterpartsineruptionETheupperandlowercounterpartseruptsimultaneously正確答案：E第2題Thepermanentteeththatfirsteruptinthemouthanddonotreplaceanyprimaryteethare:ACentralincisors

BLateralincisorsCCaninesDFirstpremolarsEFirstmolars

正確答案：EPracticequestions第1題TheheightofcontourreferstoAThemostconvexpointonproximalsurfacesofthecrownBThemostconvexpointontheocclusalsurfaceofthecrownCThemostconvexpointoneachaxialsurfaceofatoothDThemostconvexpointoneachsurfaceofthecrownPracticequestions第1題Marginalridgeislocated:AonthelingualsurfaceofthecrownBatthemesialanddistalmarginsofthelingualsurfacefortheanteriorteethCatthemesialanddistalmarginsofthelingualsurfacefortheanteriorteethandtheocclusalsurfaceofthecrownfortheposteriorteethDaroundthefossaontheocclusalsurfaceofthecrown第2題Theelevationsofthecrowninclude:AthecuspBthecingulumCthemamelonDtheridgeEthemalformedcentralcusp正確答案：ABCDPracticequestions第1題Thecrown-rootratioofthemaxillarycentralincisorsismostly:A1:2B1:1C2:1D3:1E1:3Practicequestions第1題Thereferencetodistinguishtherightandleftsideofmandibularcentralincisorsis:

Athemesio-incisalangleisnearlyarightangleBthemesialcontactareaisrelativelyclosetotheincisalangleCthedisto-incisalangleisanobtuseangleDthedistalcontactarea

isrelativelyfartotheincisalangleEthelongitudinaldepressiononthedistalsurfaceisrelativelydeeperthanthatonthemesial

surface正確答案：EPracticequestions第1題Whichofthefollowingdescriptionsofthemorphologicalcharacteristicsofthemaxillarycentralincisorisincorrect:

()AThetoothrootisinclinedtowardthedistal.

BThedistalsurfaceissmallerthanthemesialsurface.CThemesialsurfaceandthedistalsurfacearetriangular-shaped.DThecontactareaisatthemiddlethirdoftheproximalsurface.Practicequestions第1題Whichofthefollowingdescriptionsofthemaxillarycanineisincorrect:()AThelabialaxialridgeisonthelabialsurface.BThelingualaxialridgeisonthelingualsurface.CThecusptipisoffsettowardthedistal.DThecusptipisoffsettowardthemesial.EThecrosssectionofthetoothrootisanovaltriangle第2題Whichtoothhasaroottwicethelengthofthecrown,andtheshapeofthecrosssectionoftherootisovaltriangular?()AThemaxillarycentralincisorBThemandibularcentralincisorCThemaxillarycanineDThemandibularcanineEThemaxillaryfirstpremolarPracticequestions第1題Whichofthefollowingstatementsofmaxillaryfirstpremolariscorrect:（）AItisthesmallestamongallthepremolarsBThetoothrootismostlyfurcatedintobuccalrootandlingualrootatthemiddlethirdortheapicalthirdoftherootCTheocclusalsurfacecanhavethreecuspsDThebuccalcuspisoffsettowardthemesialENoneoftheaboveiscorrectPracticequestions第1題Whichofthefollowingstatementsaboutthemandibularsecondpremolariscorrect?

AThebuccalcuspistallandlarge,whilethelingualcuspissmall.BThelingualsurfacediffersconsiderablyfromthebuccalsurface.CThebuccalsurfaceiswiderthanthelingualsurface.DThedevelopmentalgrooveisshapedinH,Y,WformEIfthepremolarhastwolingualcusps,thelingualsurfaceiswiderthanthebuccalsurface.正確答案：E第2題Whichofthefollowingstatementsofmandibularfirstpremolarisincorrect?AItisthesmallestpremolar.BTheheightdifferencebetweenthebuccalcuspandlingualcuspisthelargest.CThereisatransverseridgeontheocclusalsurface.DThebuccalcuspisoffsettowardthedistal.EThereisacrescent-shapedbucco-cervicalridgeonit.Practicequestions第1題Whichofthefollowingdescriptionsofthemaxillaryfirstpremolarisincorrect:AThebuccaltipisoffsettowardthedistalBThemesialanddistalcontactareasareatthebuccalthirdtowardthemarginoftheocclusalsurface.CTheocclusalsurfaceishexagonalDThemesialcontactareaisatthemiddlethirdtowardthemarginoftheocclusalsurface,whilethedistalcontactareaisatthebuccalthirdtowardthemarginoftheocclusalsurface.Practicequestions第1題Thepermanentteeththateruptat6yearsoldanddon'treplaceanydeciduousteethare:

AcentralincisorsBlateralincisorsCcaninesDpremolarsEfirstmolars正確答案：E第2題Whichofthefollowingdescriptionsofthemaxillaryfirstmolarisincorrect:AThemesialcuspisthesmallest.BThemesialcuspisthelargest.CSometimesthere'sthefifthcusp.DTheobliqueridgecanbeseenfromtheocclusalaspect.EIthas3roots.Practicequestions第1題Thegroovethatgoesacrosstheocclusalsurfacetothelingualsurfaceiscalledthemesiolingualgroove.

第2題Themesialmarginalridgeofthemaxillaryfirstmolarislongerthanthedistalmarginalridge.Practicequestions第1題Whichtoothshowstwoandhalfcuspsonthebuccalsurface?

AMaxillaryfirstmolarBMandibularfirstmolarCMaxillarysecondmolarDMandibularsecondmolarEThirdmolars第2題Whichtoothhavethecross-shapeddevelopmentalgrooves？AMaxillaryfirstmolarBMandibularfirstmolarCMaxillarysecondmolarDMandibularsecondmolarEMandibularsecondpremolarPracticequestions第1題The

longest

triangular

ridge

on

the

occlusal

surface

of

the

mandibular

first

molar

is

the

triangular

ridge

of

the

disto-buccal

cusp.Practicequestions第1題Themorphologyofthedeciduousmaxillaryandmandibularsecondmolarsarebothsimilartothatofthepermanentfirstmolarsonthesamejaw.第2題Thedistalcuspofthedeciduousmandibularsecondmolarissmallerthanmesiobuccalcuspanddistalbuccalcusp.Practicequestions第1題Themesiodistaldiameterofthedeciduousmaxillarycentralincisorislongerthanitsincisocervicaldiameter.Practicequestions第1題Thecuspofthedeciduousmaxillarycanineisoffsettowardsthedistalandthemesialslopeislongerthanthedistalslope.Practicequestions第1題Comparedwiththepermanentfirstmolaronthesamejaw,whatcharacteristicdoesthedeciduoussecondmolarhave:()AThecrownofthedeciduoussecondmolarissmallerthanthatofthepermanentfirstmolar,andthecolorisbluish-white.BThecrownofthedeciduoussecondmolarissignificantlyconstrictednearthecervix,andisalsoconstrictedtowardstheocclusalsurface,withthecervicalregionlargerthantheocclusalregion.CThemesiobuccalcusp,distobuccalcuspanddistalcuspofdeciduousmandibularsecondmolarareofthesamesize.DOneithersideofthesamejaw,betweenthetwosimilarmolarsinthemesialanddistaldirections,thesmalleronetothemesialisthedeciduoussecondmolar.正確答案：ABCDPracticequestions第1題Theatrophyofthegingivafromthedirectimpactionofthefoodiscausedby()AtheirregularshapeofthecrownBthenormalcrestofcurvatureofthecrown.Ctheunder-contouringcurvatureofthecrownDtheover-contouringcurvatureofthecrownEnoneoftheabove第2題Thedisusedatrophyofthegingivafromthelackofthefoodmassageonthegingivaiscausedby()Athenon-contouringcurvatureofthecrownBtheover-contouringcurvatureofthecrownCtheunder-contouringcurvatureofthecrownDthenormalcrestofcurvatureofthecrownEtheirregularshapeofthecrownPracticequestions第1題Thedeciduousteethandthepermanentteetharesimilarintheshapeoftheirpulpcavities.Butproportionally,thedeciduousteethhavethesmallerpulpcavities,thinnerwallsandtallerpulphornsthanthepermanentteeth.第2題Whichofthefollowingdoesnotbelongtotherootsystem？ATherootcanalBTheintercanalanastomosesCThelateralbranchesofrootcanalDTheapicalramificationEThepulpcavityPracticequestions第1題Thetoothwiththesmallestpulpcavityis_________.

AmaxillarycentralincisorBmaxillarylateralincisorCmandibularcentralincisorDmandibularlateralincisorPracticequestions第1題Amongthepremolars,whichofthefollowingteethhasthehighestproportionofhavingdoublerootcanalsAMaxillaryfirstpremolarBMaxillarysecondpremolarCMandibularfirstpremolarDMandibularsecondpremolarPracticequestions第1題WhichofthefollowingdescriptionsaboutthepulpcavityofthemandibularfirstpremolarsisincorrectAThemesiodistaldiameterofthepulpchamberislargerthanthebuccolingualdiameter,andthebuccolingualdiameterislargerthantheheightofthepulpchamber.BTheroofofthepulpchamberisconcave.Thebottomoftheconcavityisnearlyatlevelwiththecervicalmargin.CTheheightofthelingualpulphornnearlyreachesthemiddlethirdofthecrown.DThepulphornsofbuccalcuspsanddistalcusparerelativelylow,andarelocatedatcervicalthirdofthecrownornearthecervicalline.EThedouble-rootcanalsaccountfor13%amongthemesialrootcanals.正確答案：EPracticequestions第1題WhichofthefollowingteethcanhaveC-shapedcrosssectionattherootcanal?AMaxillaryfirstmolarBMaxillarysecondmolarCMaxillarythirdmolarDMandibularfirstmolarEMandibularsecondmolar正確答案：EUnit2Test第1題1.Whichchoice(s)canhelpdifferentiatethemandibularleftandrightcentralincisors?AThemesio-incisalangleisapproximatelyrightangle.BThemesialcontactareaisclosetotheincisalangle.CThedisto-incisalangleisanobtuseangle.DThedistalcontactareaisfarfromtheincisalangle.EThelongitudinaldepressiononthedistalsurfaceoftherootisslightlydeeperthanthatofthemesialsurface.正確答案：E第2題Whichofthefollowingstatementsabouttheenamelis/arecorrect:AItishighlycalcifiedandisthehardesttissueamongthetoothtissues.B

Itiswhiteandtranslucent.CItcoversthecrown.DItcoverstheroot.ENoneoftheaboveistrue.正確答案：ABC第3題Whichofthefollowingstatementsaboutthedentinis/areincorrect:____?AItissofterthantheenamel.BItisbeneaththeenamelandcementum.CItiswhiteandglassy.DItsurroundsthepulpcavity.EItmakesupthebulkofthetooth.第4題Thesmallestteetharethe:()AmaxillarycentralincisorsBmandibularcentralincisorsCmaxillarylateralincisorsDmandibularlateralincisorsENoneoftheaboveistrue.第5題Thefirstpermanentteethtoeruptintheoralcavityandnottoreplaceanydeciduousteetharethe()AcentralincisorsBlateralincisorsCcaninesDfirstpremolarsEfirstmolars正確答案：E第6題Thecrown-rootratioofthecentralincisorsismostly:()A1:2B1:1C2:1D3:1E1:3第7題Theinclinedplanesonthecrownreferto:()ATheplanesthatmakeupthemarginalridge.BTheplanesthatmakeupthecusp.CTheplanesthatmakeuptheaxialridge.DTheplanesthatmakeuptheridges.ETheobliqueplanesofthecrown.第8題Thedevelopmentalgroovesonthecrownreferto:()ATheshallowgroovesformedbythefusionoftwolobesduringteethdevelopment.BThegroovesformedduringteethdevelopment.CThedefectivepartsoftheincompletecalcificationDTheshallowgroovesontheocclusalsurfaceofthecrownETheslenderdepressionsonthecrown第9題Theelevationsonthecrowninclude:()AthecuspsBthecingulumCthemamelonDtheridgesEthemalformedcentralcusp正確答案：ABCD第10題Whichofthefollowingdescriptionsaboutthemandibularsecondpremolarsis/arecorrect:()AThecervico-occlusalheightequalsapproximatelytothebuccolingualthicknessandthemesiodistalwidth.BThelingualsurfacediffersconsiderablyfromthebuccalsurface.CThesizeofthelingualsurfaceissimilartothatofthebuccalsurface.DThedevelopmentalgroovespatterncanbeHtype,Ytype,orUtype.EIfthepremolarhas2lingualcusps,itslingualsurfaceiswiderthanthebuccalsurface.正確答案：ACDE第11題Theanatomicalcrownrefersto:()Athepartoftoothexposedintheoralcavity.Bthepartoftoothcoveredbygums.Cthepartoftoothperformingmastication.Dthepartoftoothcoveredbydentin.Ethepartoftoothcoveredbyenamel.正確答案：E第12題Whichofthefollowingdescriptionsaboutthemandibularfirstpremolarsis/arecorrect:()ATheyarethesmallestpremolars.BTheheightdifferencebetweenthebuccalcuspandthelingualcuspisthelargest.CTherearetransverseridgesontheocclusalsurface.DThebuccalcuspisoffsettowardthedistal.EThereisacrescent-shapedbuccocervicalridge.正確答案：ABCE第13題Thelandmarkforlocatingtheparotidglandductopeningisusuallyatthecrownof:()AthemaxillaryfirstmolarBthemandibularfirstmolarCthemaxillarysecondmolarDthemandibularsecondmolarEthemaxillarythirdmolar第14題Whichofthefollowingdescriptionsofthemaxillaryfirstmolaris/arecorrect:()AFourcuspscanbeseenfromtheocclusalaspect.BFivecuspscanbeseenfromtheocclusalaspect.CSometimesthereisthefifthcusp.DTheobliqueridgecanbeseenfromtheocclusalaspect.EThetoothrootistrifurcated.正確答案：ACDE第15題Whichtoothhasthedevelopmentalgroovesshapedlikeacross:()AthemaxillaryfirstmolarBthemandibularfirstmolarCthemaxillarysecondmolarDthemandibularsecondmolarEthemandibularsecondpremolar第16題Whichofthefollowingdescriptionsaboutthemaxillarycaninesis/arecorrect:()AthelabialaxialridgeisonthelabialsurfaceBthelingualaxialridgeisonthelingualsurfaceCthecusptipisoffsettowardthedistalDthecusptipisoffsettowardthemesialEthetoothrootisflat正確答案：ABD第17題Thelandmarkforlocatingthementalforamenis:()AthemandibularcentralincisorBthemandibularlateralincisorCthemandibularcanineDthemandibularpremolarEthemandibularmolar第18題Whichtoothhasaroottwicethelengthofthecrown,withanovaltriangularshapeatthecrosssectionoftheroot:()AThemaxillarycentralincisorBThemandibularcentralincisorCThemaxillarycanineDThemandibularcanineEThemaxillaryfirstpremolar第19題Whichofthefollowingdefinitionsofthetoothrootiscorrect?()AIt’sthepartofthetooththatisfixedinthetoothsockets.BItsupportsthetooth.CIt’sthepartofthetooththatiscoveredbycementum.DIt’sthepartofthetooththatiscoveredbydentin.EIt’sthepartofthetooththatiscoveredbyperiodontalmembrane.第20題Whichofthefollowingdescriptionsaboutthemandibularcanineis/arecorrect:()ATherootisflat,rounded,andslender.BTherearelongitudinaldepressionsonthemesialanddistalsurfacesoftheroot.CThedistalslopeofthecuspisabouttwicethelengthofthemesialslope.DTheangleformedbythemesialslopeandthedistalslopeislargerthan正確答案：ABCD第21題Whichofthefollowingdescriptionsaboutthemaxillaryfirstpremolaris/arecorrect:()AItssizeisthelargestamongthepremolars.BTherearetwocuspsontheocclusalsurface.CTherecanbethreecuspsontheocclusalsurface.DIthasalabialaxialridgeandalingualaxialridge.EInmostcases,thetoothrootisdividedintothebuccalrootandthelingualrootatthemiddleorapicalthirdoftheroot.正確答案：ABE第22題Whichofthefollowingdescriptionsaboutthelobeisincorrect:()AThefusionofthelobesbecomesthedevelopmentalgroove.BThecalcificationcenterintoothdevelopmentiscalledthelobe.CEverylobedevelopsintoacusp.DMostteetharedevelopedfromfourlobes.ESometeetharedevelopedfromfivelobes.第23題Theterm“roottrunk”refersto:()Athethickandlongrootofthecanine.BthefurcatedrootCthepartoftherootbeforefurcationDthepartoftherootafterfurcationEtherootwhosecrosssectionisrounded第24題Whichofthefollowingdescriptionsofthepatternoftheeruptionoftoothisincorrect?()AEruptionhappenswithinacertainperiod.BEruptionhappensinacertainorder.CTheleftandrightcounterpartsareinpairsanderuptatthesametime.DThemandibularteethprecedetheirmaxillarycounterpartsineruption.EForthepermanenttooth,theeruptiontimeofmaleisslightlyearlierthanthatoffemale.正確答案：E第25題Thereasonforgingivalatrophyduetothedirectimpactfromfoodsis:()AThecrownhasnoconvexity.BTheshapeofthecrownisirregular.CTheconvexityofthecrownistoolittle.DTheconvexityofthecrownisnormal.ETheconvexityofthecrownistoomuch.正確答案：AC第26題Thereasonforgingivalatrophyduetothegingivalweaknessresultedfromthelackofmassagefromfoodis:()AThecrownhasnoconvexity.BTheconvexityofthecrownistoomuch.CTheconvexityofthecrownistoolittle.DTheconvexityofthecrownisnormal.ETheshapeofthecrownisirregular.第27題“Midline”refersto:()Aanimaginarylinedividingskullandfaceintotwoequalparts.Banimaginarylinecrossingbetweenthetwoeyes.CanimaginarylinedividingthedentalarchintotwoequalpartsDanimaginarylinedividingtheskullandfaceintotwoequalleftandrightparts.Ethesagittalsutureoftheskull第28題Whichofthefollowingmorphologicaldescriptionsaboutthelabialsurfaceofthecrownofthemaxillarycentralincisorisincorrect?()ATheoutlineofthelabialsurfaceistrapezoidal.BTheinciso-gingivaldiameterislargerthanthemesio-distaldiameter.CThemesialmarginislongandstraight,whilethedistalmarginisshortandconvex.DTherearethreetofourlongitudinaldevelopmentalgroovesonthelabialsurface.EThemesialincisalangleisapproximatetoarightangle,whilethedistalincisalangleisbluntandrounded.第29題Whichofthefollowingdescriptionsaboutthecervicallineisincorrect?()AThecervicalmarginiscurvedineachaxialplaneofthecrown.BThecervicallineonthelabialorbuccalsurfaceisanarcconvextotheincisaledgeorocclusalmargin.CThecervicallineonthemesialsurfaceisanarcconvextotheocclusalmargin.DThecervicallineonthedistalsurfaceisanarcconvextotheocclusalmargin.EThecervicallineonthelingualsurfaceisanarcconvextotheroot.第30題Whichpermanentteethresemblethedeciduousmandibularfirstmolars?()AthepermanentmandibularfirstmolarsBthepermanentmandibularsecondmolarsCthemandibularfirstbicuspidsDthemandibularsecondbicuspidsEThereisnopermanenttoothresemblingthedeciduousmandibularfirstmolars.正確答案：E第31題Whichofthefollowingdescriptionsabouttheincisorgroupisincorrect:()ATheincisorgrouphassingleroots.BTheoutlineofthelabialandlingualsurfacesistrapezoidal.CThemesialanddistalsurfacesaretriangular.DThecontactareaisatthemiddlethirdoftheproximalsurface.EThemaxillaryincisorislargerthanthemandibularincisor.第32題Whichofthefollowingpercentilesaboutthetwo-rootrateofthemaxillaryfirstbicuspidiscorrect?()A80%B60%C50%D95%E87%第33題Thephysicalsignificancethatthelabialsurfaceoftherootofamaxillaryanteriortoothislargerthanthelingualsurfaceis:()Atobecontinuouswiththewiderlabialsurfaceofthecrown.Btoresisttheexternalforcesfromaccidentalcollisions.Ctoresisttheforwardocclusalforce.Dtoaccommodatetheshapeofthealveolarprocess.Etocompensatethelargerexternaldiameterofthedentalarch.第34題Whichpermanentteethtendtosustaincongenitalmissing:()AThemaxillaryfirstmolarsBThemaxillarysecondmolarsCThemaxillary

central

incisorsDThemaxillary

lateral

incisorsEThemaxillary

canines第35題Thehighestpulphorninthemaxillaryfirstmolaris:()AMesialbuccalpulphornBMesiallingualpulphornCDistalbuccalpulphornDDistallingualpulphornEThepulphornbeneaththefifthtip第36題Thedistalcontactareaofthemaxillaryfirstmolarislocatedat:()AtheocclusalthirdBthejunctionbetweenthebuccalthirdandthemiddlethirdattheleveloftheocclusalthird.CthemiddlethirdattheleveloftheocclusalthirdDthemiddlethirdEThejunctionofthemiddlethirdandthelingualthirdattheleveloftheocclusalthird.正確答案：E第37題Whichofthefollowingstatementsaboutthedifferencesbetweenthemaxillarylateralincisorandthemaxillarycentralincisorisincorrect?()AThelabialsurfaceisnarrowerandmoreroundedBThelingualfossaisnarroweranddeeperCTheinclinationoftheincisalridgetowardthelingualfromthemesialtothedistalissmallerthanthatofthecentralincisorDThemesio-incisalangleislikeanacuteangle第38題Whichofthefollowingdescriptionsaboutthecrownmorphologyofthedeciduousmandibularfirstmolarisincorrect?()AThemesialmarginofbuccalsurfaceislongandstraight,whilethedistalmarginisveryshortandconvex.BThemesio-buccalcuspislargerthanthedisto-buccalcusp.CThedisto-lingualcuspislongandsharp,whilethemesio-lingualcuspisshortandsmall.DTheocclusalsurfaceisanirregularquadrilateral,withaveryshortmarginalridge.EThemesialsurfaceresemblesatrianglewiththecervicallineasitsbase.第39題Whichofthefollowingstatementsaboutthemorphologyofthedeciduoussecondmolarisincorrect?()AThecrownissmallandwhitish.BThecervicalpartofthecrownisclearlynarrowedwithaprominentcervicalridge.CThecrownnarrowsdownfromthecervicaltotheocclusal.DThesizeofthemesio-buccalcuspanddistalcusparenotthesameETheroottrunkisshort,withtheroottipspreadingout.第40題Whichofthefollowingstatementsaboutthemorphologyofthedeciduousanteriorteethisincorrect?()AThecolorisgrayishwhite,andthecrownisshort.BThecrowniswideandtherootisnarrow.CThecusptipofthedeciduousmaxillarycanineisoffsettowardthedistal.DThemarginalridgesonthelingualsurfaceofthedeciduousmandibularincisorareflatterthanthatofthepermanentincisor.EFromtheproximalaspect,thelabialandlingualcervicalridgesaremoreprominentthanthoseofthepermanentteeth正確答案：BD第41題Theso-called"inter-canalanastomoses"is:()Atheinterconnectingbranchesbetweenadjacentrootcanals.Bthesmallbranchesofrootcanal.Cthebranchperpendiculartothemainrootcanal.Dthemainrootcanalbranchrunningthroughthedentinandcementumuntilreachingperiodontalmembrane.ETherootcanalramifiesattherootapex.第42題Theresultoftheagingchangesofthepulpcavityis:()AThepulpcavitybecomessmallerandthepulphornismoreconvex.BThedistancebetweentheroofandthefloorofthepulpchamberdecreases.CThepulpchamberisenlargedandthepulphorndisappears.DThepulpchamberfloorisclosertotherootbifurcation.EThepulpcalcifiedintopulpcalculus.第43題Thedeciduousteeththatfalloffearliestare:()AthedeciduousmaxillarycentralincisorsBthedeciduousmandibularcentralincisorsCthedeciduousmaxillarylateralincisorsDthedeciduousmandibularlateralincisorsEthedeciduousmandibularcanines第44題Whichofthefollowingcomparisonsbetweenthemandibularlateralincisorandthemandibularcentralincisoriscorrect:()AThecrownofthemandibularlateralincisorisslightlywider.BThemesialanddistalmarginsofthemandibularlateralincisorsaresymmetrical.CThemesialanddistalcontactareasofthemandibularlateralincisorsareclosetotheincisalangle.DThemesio-incisalangleandthedisto-incisalangleofthemandibularlateralincisorsareapproximatelyequal.EThedepthofthelongitudinaldepressionsonthemesialanddistalsurfacesofthemandibularlateralincisoristhesame.第45題Whichofthefollowingmorphologicalcharacteristicsofthepulpchambersofyoungpermanentmaxillaryincisorsiscorrect?()AThemesio-distaldiameterneartheincisalridgeisthelargest.BThemesio-distaldiameternearthecervicalmarginisthelargest.CThemesio-distaldiameterisnearlyequaltothelabiolingualdiameter.DThelabiolingualdiameterislargerthanthemesio-distaldiameter.EThelabiolingualdiameterislargerthantheinciso-gingivaldiameter.第46題Duringtheprocessofanimaldevelopmentfromthelowleveltothehighlevel,whichchangedidtoothevolutiongothrough?()AThenumberofteethchangedfromlesstomore.BThetoothshapechangedfromcomplex(heterodont)tohomodont(isodont).CThenumberofteethreplacementchangedfromdiphyodonttopolyphyodontandtomonophyodontDTheattachmentoftheteethonthejawbonechangedfromacrodonttopleurodontandthecodontETheattachmentoftheteethonthejawbonechangedfrompleurodonttoacrodontandthecodont第47題Whatisthetimeoftootheruption?()AThetimeofemergencefromthegingiva.BThetimeofcompleteeruptionofthecrown.CThetimewhenteethreachedocclusalcontact.DThetimewhenthecrownstartstomoveatthebonycrypt.EThetwothirdsofthecrowneruptiontime第48題Whichofthefollowingeruptionorderofthedeciduousteethiscorrect?()AⅠⅡⅤⅣⅢBⅠⅡⅢⅤⅣCⅠⅡⅣⅢⅤDⅤⅠⅡⅢⅣEⅠⅡⅤⅢⅣ第49題Duringthep