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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:liferationandpolarization.REMODELINGOFSOFTTISSUESIN25REMODELINGOFJOINTCARTILAGE:abrasionanddjdNormal:

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

systemdeformation

cytoclasis;destroyofcollagenImmunoreaction

exposureofbonetissueundercartilagestimulatesymptom(pain;spasmetc.)fibrosisrigidityofTMJ.REMODELINGOFJOINTCARTILAGE26Thanks.Thanks.27BiomechanicsofTMJTongjiUniversity.BiomechanicsofTMJ.28AnatomyofTMJMandibularcondyleJointsurfaceoftemporalboneArticulardiscTMJcapsuleTMJligament.AnatomyofTMJMandibularcondy29AnatomyofTMJMandibularcondyleJointsurfaceoftemporalboneArticulardiscTMJcapsuleTMJligament.AnatomyofTMJMandibularcondy30MuscletissuerelatedtoTMJLateralpterygoidmuscleUpperside&lowersideFunctionHEAVYLOADBUTHYPOPLASIA.MuscletissuerelatedtoTMJLa31BIOMECHANICSOFTMJ.BIOMECHANICSOFTMJ.32BIOMECHANICSOFTMJWhatisbiomechanicsConcepts:viscoelasticbody;

relaxation;creepMechanicalpropertyofcollagen&elasticfiber.BIOMECHANICSOFTMJWhatisbio33conceptcreeprelaxation.conceptcreeprelaxation.34FUNCTIONMOVEMENT&BIOMECHANICSOFTMJOpeningandholdingImportantbalance:Uppersideoflateralpterygoid&upperfiberofbilaminarzoneMovementmechanismofjointdisc:Shapeofdisc&Pressureinjoint.FUNCTIONMOVEMENT&BIOMECHANI35FUNCTIONALMOVEMENTANDBIOMECHANICSOFTMJOpeningandholdingNormal：anteriorbevelofcondyle&intermediateofdisc&posteriorbevelofjointnode—oneplaneOpeningHoldingRestposition.FUNCTIONALMOVEMENTANDBIOMEC36FUNCTIONALMOVEMENTANDBIOMECHANICSOFTMJChewingprocessMovementmechanismofjointdisc:Shapeofdisc&PressureinjointWorkingsideBalancesideBalancesideWorkingside.FUNCTIONALMOVEMENTANDBIOMEC37BIOMECHANICSOFCARTILAGE

INTMJ.BIOMECHANICSOFCARTILAGE

IN38BIOMECHANICSOFCARTILAGEINTMJStructureofcartilageCartilagebasementCartilagecell：0.01-0.1％H2OCollagen：Proteinpolysaccharide：Structuralglycoprotein.BIOMECHANICSOFCARTILAGEINT39Articularcartilage－

viscoelasticaltwophasemixture★

Theoryofsolid－liquidphaseporousviscoelasticbodyUnloadBIOMECHANICSOFCARTILAGEINTMJNormalLoading.Articularcartilage－

40StresscushioningsystemofcartilageBIOMECHANICSOFCARTILAGEINTMJBonesubstanceofcondyleShallow

levelMiddlelevelDeeplevelsynoviapressioncollagen-Proteinpolysaccharide

–gelgridstructuresystemFunctionofcartilage:bearing;stressdispersion;stresscushioning;jointlubricationCartilage.Stresscushioningsystemofca41LubricationofcartilageBIOMECHANICSOFCARTILAGEINTMJBoundarylubricationFluidfilmlubrication（weeping~/pressioninfiltration~）Hydroaulicstatic~Hydroaulicmotive~Jointlubricationrelatedtosynovia&structureandmechanicsofcartilage&motionstateofcartilage

.LubricationofcartilageBIOMEC42BIOMECHANICSOFDISCANDPOSTIOR-DISCTISSUE.BIOMECHANICSOFDISCANDPOSTI43BIOMECHANICSOFDISCANDPOSTIOR-DISCTISSUEJiontdiscViscoelasticbody:Lowpermeability&

highcompressionrigidityStressconcentrationbuffer:transfer;stressdispersion;shortcushioning.BIOMECHANICSOFDISCANDPOSTI44Postior-disctissueBIOMECHANICSOFDISCANDPOSTIOR-DISCTISSUEAHighcompliancefiberousconnectivetissueElasticfibergridsystemThinandloosencollagenfiberA;V;N;lymph;fatViscoelasticsObviousrelaxationHighpermeabilityLowtensionstrengthHighpassivedeformabilityDiscmoveforward;multipleperforationinpostiorareaofdiscCounterbalancetouppersideoflateralpterygoidmuscle×.Postior-disctissueBIOMECHANIC45BIOMECHANICSOFCAPSULEANDLIGAMENTOFTMJ.BIOMECHANICSOFCAPSULEANDLI46BIOMECHANICSOFCAPSULEANDLIGAMENTOFTMJLateralpositionofTMJPostpositionofTMJ.BIOMECHANICSOFCAPSULEANDLI47BIOMECHANICSOFCAPSULEANDLIGAMENTOFTMJLigament---bearinghightensionloadCapsule---adapttomultiwaytensileloading;stressdispersion;productionandtransferofsynoviaTMJcapsuleJointligamentStabilityofTMJassistant.BIOMECHANICSOFCAPSULEANDLI48REMODELINGOFTMJ.REMODELINGO49REMODELINGOFTMJConceptDevelopmentofTMJ:20ys,remodelinginalllifetimeRemodelingRetrograderemodeling:anterior-lateralinclineofcondyle&posterior-lateralinclineofjointnodeProgressive~：hyperplasia-condyleRetrograde~：absorption–condyle;disc;node.REMODELINGOFTMJProgressive~50REMODELINGOFHARDTISSUESINTMJSlightperiodicalload

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