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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:adapttotheneedsoffunction.proliferationandpolarization.REMODELINGOFSOFTTISSUESIN25REMODELINGOFJOINTCARTILAGE:abrasionanddjdNormal:
Periodicalload===swellingpressure(incollagen-Proteinpolysaccharide-gelgridsystem)Abnormalload
systemdeformation
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