同濟牙合學(xué)課件之第2章顳下頜關(guān)節(jié)及其生物力

BiomechanicsofTMJTongjiUniversity.BiomechanicsofTMJ.1AnatomyofTMJMandibularcondyleJointsurfaceoftemporalboneArticulardiscTMJcapsuleTMJligament.AnatomyofTMJMandibularcondy2AnatomyofTMJMandibularcondyleJointsurfaceoftemporalboneArticulardiscTMJcapsuleTMJligament.AnatomyofTMJMandibularcondy3MuscletissuerelatedtoTMJLateralpterygoidmuscleUpperside&lowersideFunctionHEAVYLOADBUTHYPOPLASIA.MuscletissuerelatedtoTMJLa4BIOMECHANICSOFTMJ.BIOMECHANICSOFTMJ.5BIOMECHANICSOFTMJWhatisbiomechanicsConcepts:viscoelasticbody;

relaxation;creepMechanicalpropertyofcollagen&elasticfiber.BIOMECHANICSOFTMJWhatisbio6conceptcreeprelaxation.conceptcreeprelaxation.7FUNCTIONMOVEMENT&BIOMECHANICSOFTMJOpeningandholdingImportantbalance:Uppersideoflateralpterygoid&upperfiberofbilaminarzoneMovementmechanismofjointdisc:Shapeofdisc&Pressureinjoint.FUNCTIONMOVEMENT&BIOMECHANI8FUNCTIONALMOVEMENTANDBIOMECHANICSOFTMJOpeningandholdingNormal：anteriorbevelofcondyle&intermediateofdisc&posteriorbevelofjointnode—oneplaneOpeningHoldingRestposition.FUNCTIONALMOVEMENTANDBIOMEC9FUNCTIONALMOVEMENTANDBIOMECHANICSOFTMJChewingprocessMovementmechanismofjointdisc:Shapeofdisc&PressureinjointWorkingsideBalancesideBalancesideWorkingside.FUNCTIONALMOVEMENTANDBIOMEC10BIOMECHANICSOFCARTILAGE

INTMJ.BIOMECHANICSOFCARTILAGE

IN11BIOMECHANICSOFCARTILAGEINTMJStructureofcartilageCartilagebasementCartilagecell：0.01-0.1％H2OCollagen：Proteinpolysaccharide：Structuralglycoprotein.BIOMECHANICSOFCARTILAGEINT12Articularcartilage－

viscoelasticaltwophasemixture★

Theoryofsolid－liquidphaseporousviscoelasticbodyUnloadBIOMECHANICSOFCARTILAGEINTMJNormalLoading.Articularcartilage－

13StresscushioningsystemofcartilageBIOMECHANICSOFCARTILAGEINTMJBonesubstanceofcondyleShallow

levelMiddlelevelDeeplevelsynoviapressioncollagen-Proteinpolysaccharide

–gelgridstructuresystemFunctionofcartilage:bearing;stressdispersion;stresscushioning;jointlubricationCartilage.Stresscushioningsystemofca14LubricationofcartilageBIOMECHANICSOFCARTILAGEINTMJBoundarylubricationFluidfilmlubrication（weeping~/pressioninfiltration~）Hydroaulicstatic~Hydroaulicmotive~Jointlubricationrelatedtosynovia&structureandmechanicsofcartilage&motionstateofcartilage

.LubricationofcartilageBIOMEC15BIOMECHANICSOFDISCANDPOSTIOR-DISCTISSUE.BIOMECHANICSOFDISCANDPOSTI16BIOMECHANICSOFDISCANDPOSTIOR-DISCTISSUEJiontdiscViscoelasticbody:Lowpermeability&

highcompressionrigidityStressconcentrationbuffer:transfer;stressdispersion;shortcushioning.BIOMECHANICSOFDISCANDPOSTI17Postior-disctissueBIOMECHANICSOFDISCANDPOSTIOR-DISCTISSUEAHighcompliancefiberousconnectivetissueElasticfibergridsystemThinandloosencollagenfiberA;V;N;lymph;fatViscoelasticsObviousrelaxationHighpermeabilityLowtensionstrengthHighpassivedeformabilityDiscmoveforward;multipleperforationinpostiorareaofdiscCounterbalancetouppersideoflateralpterygoidmuscle×.Postior-disctissueBIOMECHANIC18BIOMECHANICSOFCAPSULEANDLIGAMENTOFTMJ.BIOMECHANICSOFCAPSULEANDLI19BIOMECHANICSOFCAPSULEANDLIGAMENTOFTMJLateralpositionofTMJPostpositionofTMJ.BIOMECHANICSOFCAPSULEANDLI20BIOMECHANICSOFCAPSULEANDLIGAMENTOFTMJLigament---bearinghightensionloadCapsule---adapttomultiwaytensileloading;stressdispersion;productionandtransferofsynoviaTMJcapsuleJointligamentStabilityofTMJassistant.BIOMECHANICSOFCAPSULEANDLI21REMODELINGOFTMJ.REMODELINGO22REMODELINGOFTMJConceptDevelopmentofTMJ:20ys,remodelinginalllifetimeRemodelingRetrograderemodeling:anterior-lateralinclineofcondyle&posterior-lateralinclineofjointnodeProgressive~：hyperplasia-condyleRetrograde~：absorption–condyle;disc;node.REMODELINGOFTMJProgressive~23REMODELINGOFHARDTISSUESINTMJSlightperiodicalloadprogressiveremodeling2。Heavyload&longtime

remodelingcease

retrograderemodeling

destroyofstructureandfunction.REMODELINGOFHARDTISSUESIN24REMODELINGOFSOFTTISSUESINTMJSofttissues－connectivetissuezone;proliferativezone;fibrouscartilagezoneImportantpart:softtissueoncondyleRemodeling：loadformationofcartilageAims:adapttotheneedsoffunction.proliferationandpolarization.REMODELINGOFSOFTTISSUESIN25REMODELINGOFJOINTCARTILAGE:abrasionanddjdNormal:

Periodicalload===swellingpressure(incollagen-Proteinpolysaccharide-gelgridsystem)Abnormalload

systemdeformation