1、Biomechanics of TMJ,Tongji University,Anatomy of TMJ,Mandibular condyle Joint surface of temporal bone Articular disc TMJ capsule TMJ ligament,Anatomy of TMJ,Mandibular condyle Joint surface of temporal bone Articular disc TMJ capsule TMJ ligament,Muscle tissue related to TMJ,Lateral pterygoid muscl

2、e Upper side relaxation; creep Mechanical property of collagen stress dispersion; stress cushioning; joint lubrication,Cartilage,Lubrication of cartilage,BIOMECHANICS OF CARTILAGE IN TMJ,Boundary lubrication Fluid film lubrication （weeping / pression infiltration ）,Hydroaulic static Hydroaulic motiv

3、e ,Joint lubrication related to synovia stress dispersion; short cushioning,BIOMECHANICS OF DISC AND POSTIOR-DISC TISSUE,Postior-disc tissue,A High compliance fiberous connective tissue,Elastic fiber grid system Thin and loosen collagen fiber A; V; N; lymph; fat,Viscoelastics Obvious relaxation High

4、 permeability Low tension strength High passive deformability,Disc move forward; multiple perforation in postior area of disc,Counterbalance to upper side of lateral pterygoid muscle,BIOMECHANICS OF CAPSULE AND LIGAMENT OF TMJ,BIOMECHANICS OF CAPSULE AND LIGAMENT OF TMJ,Lateral position of TMJ,Post

5、position of TMJ,BIOMECHANICS OF CAPSULE AND LIGAMENT OF TMJ,Ligament - bearing high tension load Capsule - adapt to multiway tensile loading; stress dispersion; production and transfer of synovia,TMJ capsule,Joint ligament,Stability of TMJ,assistant,REMODELING OF TMJ,REMODELING OF TMJ,Concept Develo

6、pment of TMJ: 20ys, remodeling in all lifetime Remodeling Retrograde remodeling : anterior-lateral incline of condyle disc; node,REMODELING OF HARD TISSUES IN TMJ,Slight periodical load progressive remodeling 2。 Heavy load proliferative zone; fibrous cartilage zone Important part: soft tissue on con

7、dyle Remodeling： load formation of cartilage Aims: adapt to the needs of function.,proliferation and polarization,REMODELING OF JOINT CARTILAGE : abrasion and djd,Normal: Periodical load = swelling pressure (in collagen- Protein polysaccharide- gel grid system) Abnormal load system deformation cytoclasis; destroy of collagen Immunoreacti