MasticatoryAnatomy TheMusclesofMastication A. TemporalisMuscle Origin:

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Описание презентации MasticatoryAnatomy TheMusclesofMastication A. TemporalisMuscle Origin: по слайдам

Masticatory. Anatomy Masticatory. Anatomy

The. Musclesof. Mastication The. Musclesof. Mastication

A. Temporalis. Muscle Origin: temporalfossa& temporalfascia Insertion: coronoidprocess &anterioroframus A. Temporalis. Muscle Origin: temporalfossa& temporalfascia Insertion: coronoidprocess &anterioroframus

A. Temporalis. Muscle Function: Elevationand positioningofthe mandible A. Temporalis. Muscle Function: Elevationand positioningofthe mandible

B. Masseter. Muscle Origin: zygomaticarch Insertion: lateralsurface oframus, coronoid process&angleof mandible B. Masseter. Muscle Origin: zygomaticarch Insertion: lateralsurface oframus, coronoid process&angleof mandible

B. Masseter. Muscle Function: powerwith verticalelevationof themandible; deep portionstabilizesthe condyleinprotrusive closure B. Masseter. Muscle Function: powerwith verticalelevationof themandible; deep portionstabilizesthe condyleinprotrusive closure

C. Medial. Pterygoid. Muscle Origin: medialsurfaceof lateralpterygoidplate, pyramidalprocessof palatinebone&Mx tuberosity Insertion: medialsurface oframus&angleof mandible C. Medial. Pterygoid. Muscle Origin: medialsurfaceof lateralpterygoidplate, pyramidalprocessof palatinebone&Mx tuberosity Insertion: medialsurface oframus&angleof mandible

C. Medial. Pterygoid. Muscle Function: elevationof themandible, protrusionofthe mandibleandlateral movementofthe mandiblewith unilateralactivation C. Medial. Pterygoid. Muscle Function: elevationof themandible, protrusionofthe mandibleandlateral movementofthe mandiblewith unilateralactivation

Pterygomasseteric. Sling Pterygomasseteric. Sling

D. Inferior. Lateral. Pterygoid. Muscle Origin: lateralsurfaceof lateralpterygoidplate Insertion: pterygoid foveaofcondyle D. Inferior. Lateral. Pterygoid. Muscle Origin: lateralsurfaceof lateralpterygoidplate Insertion: pterygoid foveaofcondyle

D. Inferior. Lateral. Pterygoid. Muscle Function: protrusion, lateralmovementand contributestoopening D. Inferior. Lateral. Pterygoid. Muscle Function: protrusion, lateralmovementand contributestoopening

E. Superior. Lateral. Pterygoid. Muscle Origin: infratemporal surfacegreaterwingof thesphenoidbone Insertion: pterygoid foveaofthecondyle andvariabletothedisc E. Superior. Lateral. Pterygoid. Muscle Origin: infratemporal surfacegreaterwingof thesphenoidbone Insertion: pterygoid foveaofthecondyle andvariabletothedisc

E. Superior. Lateral. Pterygoid. Muscle Function: activewiththe musclesofclosure, especiallyaiding stabilizationofthe condyleduringthe powerstroke E. Superior. Lateral. Pterygoid. Muscle Function: activewiththe musclesofclosure, especiallyaiding stabilizationofthe condyleduringthe powerstroke

Temporomandibular. Joint Anatomy Temporomandibular. Joint Anatomy

“ Craniomandibular. Joint”: a diarthrodialorsynoviallinedjoint “ Craniomandibular. Joint”: a diarthrodialorsynoviallinedjoint

Acompoundjoint: 2 components • Temporal. Bone • Mandibular. Condyle • Articular. Disc Acompoundjoint: >2 components • Temporal. Bone • Mandibular. Condyle • Articular. Disc

A. Temporal. Bone • Cranialcomponent • Mandibularfossa • Articulareminence • Articularsurfacefrom superiorfossatothe anterioraspectofthe eminence, thickest bone.A. Temporal. Bone • Cranialcomponent • Mandibularfossa • Articulareminence • Articularsurfacefrom superiorfossatothe anterioraspectofthe eminence, thickest bone.

B. Mandibular. Component: Condyle • Condylardimensions:  AP 810 mm ML 1520 mm • Articularsurface: B. Mandibular. Component: Condyle • Condylardimensions: AP 810 mm ML 1520 mm • Articularsurface: anteriorsuperioraspect

B. Mandibular. Condyle • Variationsidetosidein sizeandshapeiscommon. Responsetoloading • Lateralpoleanteriorto medialpole. B. Mandibular. Condyle • Variationsidetosidein sizeandshapeiscommon. Responsetoloading • Lateralpoleanteriorto medialpole.

C. Articular. Tissue • Origin: modified periosteumof intramembranousbone, NOTendochondralorigin. Aconsequenceof 2 embryonictissuemasses growingtowardseach other, NOTasingletissue massclefttoformajointC. Articular. Tissue • Origin: modified periosteumof intramembranousbone, NOTendochondralorigin. Aconsequenceof 2 embryonictissuemasses growingtowardseach other, NOTasingletissue massclefttoformajoint articulation.

C. Articular. Tissue • Function: 1) loaddistribution 2)synoviallubrication • Character: NOT hyalinecartilage, but fibrousinnature 1)avascular 2)NOTinnervatedC. Articular. Tissue • Function: 1) loaddistribution 2)synoviallubrication • Character: NOT hyalinecartilage, but fibrousinnature 1)avascular 2)NOTinnervated 3)resistanttoshear, tensionforces 4)increased remodelingpotential

D. Articular. Disc • Composition: avascularconnective tissue, collagenous • Shape: biconcavein crosssectionwith posteriorband, intermediatezoneand anteriorband •D. Articular. Disc • Composition: avascularconnective tissue, collagenous • Shape: biconcavein crosssectionwith posteriorband, intermediatezoneand anteriorband • Position: posterior bandedgeat“ 12: 00”

D. Articular. Disc D. Articular. Disc

E. TMJoint. Capsule • Function:  1)limitextreme. ROM 2)synoviallining 3)confinessynovial fluid 4)jointproprioception E. TMJoint. Capsule • Function: 1)limitextreme. ROM 2)synoviallining 3)confinessynovial fluid 4)jointproprioception

F. Mandibular. Ligaments Restrictandlimit jointrangeofmotion F. Mandibular. Ligaments Restrictandlimit jointrangeofmotion

A. Temporomandibular Ligament • Lateralthickeningof the. TMjtcapsule • Limits: retrusionand inferiorcondylar distraction A. Temporomandibular Ligament • Lateralthickeningof the. TMjtcapsule • Limits: retrusionand inferiorcondylar distraction

B. Collateral. Ligaments • Medialandlateral • Limit: medialand lateralmovementof thediscrelativetothe condyle B. Collateral. Ligaments • Medialandlateral • Limit: medialand lateralmovementof thediscrelativetothe condyle

C. Accessory. Ligaments • Sphenomandibular Ligament: nonfunctionalvestige orremnantof Meckel’scartilage • Stylomandibular Ligament: limits extremejaw protrusion C. Accessory. Ligaments • Sphenomandibular Ligament: nonfunctionalvestige orremnantof Meckel’scartilage • Stylomandibular Ligament: limits extremejaw protrusion

TMJoint. Stability • NOT ligaments • Muscles pulling acrossjoints • Articular. Disc Geometry TMJoint. Stability • NOT ligaments • Muscles pulling acrossjoints • Articular. Disc Geometry

TMJoint. Anatomy: sagittal • Lateral. Pterygoid. M Superiorheadinsertion condyle&sometimesdisc Inferiorheadinsertion condyle • Retrodiscaltissues 1)Superiorelastic 2)Inferior“check ligament”TMJoint. Anatomy: sagittal • Lateral. Pterygoid. M Superiorheadinsertion condyle&sometimesdisc Inferiorheadinsertion condyle • Retrodiscaltissues 1)Superiorelastic 2)Inferior“check ligament” 3)Loose. C. T. venous compartmentand innervated • Synovialtissues

TMJoint. Retrodiscal. Tissue TMJoint. Retrodiscal. Tissue

TMJoint. Innervation: V 3 TMJoint. Innervation: V

TMJoint. Functional. Anatomy Readpagesin. Okeson, pp. 2226! TMJoint. Functional. Anatomy Readpagesin. Okeson, pp. 2226!

Centric. Relation (Okeson, 2003) Jawpositionwiththe condylesintheirmost superoanterior postionsinthe articularfossae, restingagainstthe posteriorslopesofthe articulareminences, withthearticulardiscs properlyinterposed. Centric. Relation (Okeson, 2003) Jawpositionwiththe condylesintheirmost superoanterior postionsinthe articularfossae, restingagainstthe posteriorslopesofthe articulareminences, withthearticulardiscs properlyinterposed.

Biologyof. Centric. Relation • Muscloskeletal. Stability:  astablepositioninwhich toloadthejoint, mmpull acrossjtsseatingcondyle • Clinical. Evidence:  patientsdowellwith.Biologyof. Centric. Relation • Muscloskeletal. Stability: astablepositioninwhich toloadthejoint, mmpull acrossjtsseatingcondyle • Clinical. Evidence: patientsdowellwith. IP coincidentalwithjaw positionin. CR(clinical experience)

Biologyof. Centric. Relation • Clinicallyrepeatable:  a referencepositionfor restorativedental procedures … but. NOTimmutable! (Celenza. FV, JPDBiologyof. Centric. Relation • Clinicallyrepeatable: a referencepositionfor restorativedental procedures … but. NOTimmutable! (Celenza. FV, JPD 1973) … (~1 yr? )