同济牙合学课件ppt之第2章 颞下颌关节及其生物力学（英文）

Biomechanics of TMJ Tongji University Anatomy of TMJ Mandibular condyle Joint surface of temporal bone Articular disc TMJ capsule TMJ ligamentTMJ ligament Anatomy of TMJ MandibularMandibular condylecondyle Joint surface of temporal boneJoint surface of temporal bone ArticularArticular disc disc TMJ capsule TMJ ligamentTMJ ligament Muscle tissue related to TMJ Lateral pterygoid muscle 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 motive Joint lubrication related to synovia stress dispersion; short cushioning Postior-disc tissue BIOMECHANICS OF DISC AND 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 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 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 capsuleJoint ligament Stability of TMJ assistant REMODELING OF TMJ REMODELING OF TMJ Concept Development 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 condyle 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 Immunor