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1、Biomechanics of TMJTongji UniversityTongji University.Anatomy of TMJAnatomy of TMJMandibular condyleJoint surface of temporal boneArticular discTMJ capsule TMJ ligamentTMJ ligament.Anatomy of TMJ Mandibular condyleMandibular condyle Joint surface of temporal boneJoint surface of temporal bone Articu
2、lar discArticular discTMJ capsule TMJ ligamentTMJ ligament.Muscle tissue related to TMJLateral pterygoid muscleLateral pterygoid muscleUpper side&lower sideUpper side&lower sideFunctionFunctionHEAVY LOAD BUT HYPOPLASIA.BIOMECHANICS OF TMJ.BIOMECHANICS OF TMJWhat is biomechanicsWhat is biomechanicsCo
3、ncepts:viscoelastic body;Concepts:viscoelastic body;relaxation;creeprelaxation;creepMechanical property of collagen&elastic fiberMechanical property of collagen&elastic fiber.conceptcreeprelaxation.FUNCTION MOVEMENT&BIOMECHANICS OF TMJOpening and holding Opening and holding Important balance:Upper s
4、ide of lateral pterygoid&upper fiber of bilaminar zoneMovement mechanism of joint disc:Shape of disc&Pressure in joint.FUNCTIONAL MOVEMENT AND BIOMECHANICS OF TMJOpening and holdingOpening and holdingNormal：anterior bevel of condyle&intermediate of disc&posterior bevel of joint node one planeOpening
5、HoldingRest position.FUNCTIONAL MOVEMENT AND BIOMECHANICS OF TMJChewing processChewing processMovement mechanism of joint disc:Shape of disc&Pressure in jointWorking sideBalance side Balance side Working side.BIOMECHANICS OF CARTILAGE IN TMJ.BIOMECHANICS OF CARTILAGE IN TMJStructure of cartilageStru
6、cture of cartilageCartilage basementCartilage cell：0.01-0.1H2OCollagen：Protein polysaccharide：Structural glycoprotein.Articular cartilage viscoelastical two phase mixture Theory of solidliquid phase porous viscoelastic bodyUnloadBIOMECHANICS OF CARTILAGE IN TMJNormalLoading.Stress cushioning system
7、of cartilageStress cushioning system of cartilageBIOMECHANICS OF CARTILAGE IN TMJBone substance of condyleShallow levelMiddle levelDeep levelsynoviapressioncollagen-Protein polysaccharide gel grid structure systemFunction of cartilage:bearing;stress dispersion;stress cushioning;joint lubricationCart
8、ilageCartilage.Lubrication of cartilageLubrication of cartilageBIOMECHANICS OF CARTILAGE IN TMJBoundary lubricationFluid film lubrication（weeping/pression infiltration ）Hydroaulic static Hydroaulic motive Joint lubrication related tosynovia&structure and mechanics of cartilage&motion state of cartil
9、age.BIOMECHANICS OF DISC AND POSTIOR-DISC TISSUE.BIOMECHANICS OF DISC AND POSTIOR-DISC TISSUEJiont discJiont discViscoelastic body:Low permeability&high compression rigidityStress concentration buffer:transfer;stress dispersion;short cushioning.Postior-disc tissuePostior-disc tissueBIOMECHANICS OF D
10、ISC AND POSTIOR-DISC TISSUEA High compliance fiberous connective tissueElastic fiber grid systemThin and loosen collagen fiberA;V;N;lymph;fatViscoelasticsObvious relaxationHigh permeabilityLow tension strengthHigh passive deformabilityDisc move forward;multiple perforation in postior area of discCou
11、nterbalance to upper side of lateral pterygoid muscle.BIOMECHANICS OF CAPSULE AND LIGAMENT OF TMJ.BIOMECHANICS OF CAPSULE AND LIGAMENT OF TMJLateral position of TMJPost position of TMJ.BIOMECHANICS OF CAPSULE AND LIGAMENT OF TMJLigament-bearing high tension loadLigament-bearing high tension loadCaps
12、ule-adapt to multiway tensile loading;stress dispersion;Capsule-adapt to multiway tensile loading;stress dispersion;production and transfer of synoviaproduction and transfer of synoviaTMJ capsuleJoint ligamentStability of TMJassistant.REMODELING OF TMJ.REMODELING OF TMJConceptConceptDevelopment of T
13、MJ:20ys,remodeling in all lifetimeDevelopment of TMJ:20ys,remodeling in all lifetimeRemodelingRemodelingRetrograde remodeling:anterior-lateral incline of condyle&Retrograde remodeling:anterior-lateral incline of condyle&posterior-lateral incline of joint nodeposterior-lateral incline of joint nodePr
14、ogressive：hyperplasia-condyleRetrograde：absorption condyle;disc;node.REMODELING OF HARD TISSUES IN TMJ1.1.Slight periodical load progressive remodeling Slight periodical load progressive remodeling2 2。Heavy load&long time Heavy load&long time remodeling ceaseremodeling cease retrograde remodeling re
15、trograde remodeling destroy of structure and functiondestroy of structure and function.REMODELING OF SOFT TISSUES IN TMJSoft tissues Soft tissues connective tissue zone;proliferative zone;fibrous cartilage zone connective tissue zone;proliferative zone;fibrous cartilage zoneImportant part:soft tissu
16、e on condyleImportant part:soft tissue on condyleRemodelingRemodeling：loadload formation of cartilage formation of cartilageAims:adapt to the needs of function.Aims:adapt to the needs of function.proliferation and polarization.REMODELING OF JOINT CARTILAGE:abrasion and djdNormal:Normal:Periodical lo
17、ad =swelling pressurePeriodical load =swelling pressure (in collagen-Protein polysaccharide-gel grid system)(in collagen-Protein polysaccharide-gel grid system)Abnormal load Abnormal load system deformationsystem deformation cytoclasis;destroy of cytoclasis;destroy of collagen Immunoreactioncollagen Immunoreaction exposure of bone tissue under exposure of bone tissue under cartilage stimulate symptom(pain;spasm etc.)fibrosis cartilage stimulate symptom(pain;spasm etc.)fibrosis rigidity of TMJrigidity of TMJ.ThanksThanks.