TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ]

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TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ]. Is the articulation between the mandible and the cranium . It is a bilateral articulation. Anatomy. Articular fossa and eminence . Condylar head . Articular disc (meniscus). Articular capsule (capsular ligament) . - PowerPoint PPT Presentation

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  • TEMPROMANDIBULAR JOINT ANDMOVEMENTS MANDIBULAR[ T M J ]Is the articulation between the mandible and the cranium .It is a bilateral articulation .

  • AnatomyArticular fossa and eminence .Condylar head .Articular disc (meniscus). Articular capsule (capsular ligament) .TMJ ligament . Synovial membrane .

  • Muscles of masticationTemporalis .Masseter .Medial pterygoid .Lateral pterygoid .

  • TemporalisMasseter

  • THE BASIC MOVEMENTS OF THE MANDIELERotation Movement = hinge movement .Translation Movement(gliding movement.)

  • Hinge movement = rotationRotation movement = hinge movement.It is the rotation of the mandible around an imaginary hinge axis at the centers of the condyles.It occurs in the lower compartment of the joint

  • Gliding or translationIt is the body movement of the mandible.It occurs in the upper compartment.

  • Condyle in retroded .no movement positionCondyle performing rotation=hinge movementCondyle performing anterior translation=gliding.

  • intercusbal position from which hinge movement will start No TranslationSagittal view=lateral view

  • Translation

  • Protrosion movementIt is the forward movement of the mandible.The mandible does not move in pure forward movement.The mandible moves down ward and forward = Gliding = translation movement.It occurs when the mandible moves from retroded position to -edge to edge position- to- reverse over jet, of anterior teeth.

  • Excursive MovementsProtrusive No Posterior Contact The lower anterior teeth ride up the lingual of the maxillary anterior teeth as the jaw goes forward.

  • Incisal path

  • Condylar path

  • Condylar path inclination varies according to the amount of protrusion. a-b Sagittal condylar path inclination. Centric relation position of the condyle. 4-P. 4 mm protrusion.8P. 8 mm protrusion

  • No Translation

  • Translation

  • Posselts Figure

  • MPMOICPRCPHAMP = Maximal protrusionICP = Intercuspal positionRCP= Retruded Contact position HA = Hinge axisMO = Maximum opening EE=edge to edgePosselts FigureHabitual Arc of Closure

  • Edge to edge position.

  • Christensen Phenomena When the mandible moves to edge to edge position , separation occurs distally between the natural dentition or occlusion rims .Protrusive RecordThe protrusive relationship determines the angle of the horizontal condylar path

  • Anterior biting to reverse vertical overlap.

  • Lateral Movement .Working side = the side which the movement take placeLateral Movement . (non working side = the side which the mandible moves away from.Lateral movement of the mandible

  • The Condylar PathHorizontal Condylar Path .Lateral Condylar Path .The Condylar Path Angle .

  • 2. Vertical relations.

  • Vertical Dimension of rest The vertical dimension of the face when the mandible is in rest position.

  • Vertical Dimension of occlusion The vertical dimension of the face when the teeth are in contact in centric occlusion.

  • Freeway space= V.D.R. V.D.O. = 2-4mm

  • The centric relationIt is the relation between the mandible and the maxilla when the mandible in the physiologic retroded position at the vertical dimension of occlusion.

    Importance: it is the point from which all movemnt of the mandible will start and end must be recorded to arrange the teeth in this position

  • Thank you

    *******An illustration of a protrusive excursion, with the mandible moving forward. The lower anterior teeth ride up the lingual of the maxillary anterior teeth as the jaw goes forward.*