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TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible...

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TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] s the articulation between the mandible and the cra t is a bilateral articulation .
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Page 1: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.

TEMPROMANDIBULAR JOINT ANDMOVEMENTS MANDIBULAR

[T M J]

1. Is the articulation between the mandible and the cranium .

2. It is a bilateral articulation .

Page 2: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.

AnatomyAnatomy1. Articular fossa and

eminence .

2. Condylar head .

3. Articular disc (meniscus).

4. Articular capsule (capsular ligament) .

5. TMJ ligament .

6. Synovial membrane .

Page 3: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.
Page 4: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.
Page 5: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.
Page 6: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.

Muscles of mastication

1. Temporalis .

2. Masseter .

3. Medial pterygoid .

4. Lateral pterygoid .

Page 7: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.

Temporalis

Masseter

Page 8: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.
Page 9: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.
Page 10: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.

THE BASIC MOVEMENTS OF THE MANDIELE

1. Rotation Movement

= hinge movement .

1. Translation Movement

(gliding movement.)

Page 11: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.

Hinge movement = rotationHinge movement = rotation Rotation 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

Page 12: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.

Gliding or translationGliding or translation

It is the body movement of the mandible.It occurs in the upper compartment.

Page 13: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.

Condyle in retroded .no movement position

Condyle performing rotation=hinge movement Condyle

performing anterior translation=gliding.

Page 14: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.

intercusbal intercusbal position from position from which hinge which hinge movement will movement will startstart

No TranslationNo Translation

Sagittal view=lateral view

Page 15: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.

TranslationTranslation

Page 16: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.

Protrosion movementProtrosion movement

It 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.

Page 17: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.

Excursive MovementsExcursive Movements

Protrusive – No Posterior Contact

The lower anterior teeth ride up the lingual of the maxillary anterior teeth as the jaw goes forward.

Page 18: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.

Incisal pathIncisal path

Page 19: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.

Condylar pathCondylar path

Page 20: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.

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

Page 21: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.

No TranslationNo Translation

Page 22: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.

TranslationTranslation

Page 23: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.
Page 24: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.
Page 25: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.

Posselt’s Posselt’s FigureFigure

Page 26: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.

MP

MO

ICPRCP

HA

MP = Maximal protrusion

ICP = Intercuspal position

RCP= Retruded Contact position

HA = Hinge axis

MO = Maximum opening

EE=edge to edge

Posselt’s Figure

Habitual Arc of ClosureHabitual Arc of Closure

Page 27: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.

Edge to edge position.

Page 28: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.

Christensen Phenomena When the mandible moves to edge to edge position , separation occurs distally between the natural dentition or occlusion rims .

Protrusive

Record

The protrusive relationship determines the angle of the horizontal condylar path

Page 29: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.

Anterior biting to reverse vertical overlap.

Page 30: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.

Lateral Movement .Working side = the side which the movement take place

Lateral Movement. ) non working side =the side which the

mandible moves away from.

Lateral movement of the mandible

Page 31: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.

The Condylar Path

1. Horizontal Condylar Path .

2. Lateral Condylar Path .

3. The Condylar Path Angle .

Page 32: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.

22 . .Vertical relationsVertical relations..

Page 33: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.

Vertical Dimension of rest

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

Page 34: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.

Vertical Dimension of occlusion

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

Page 35: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.

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

Page 36: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.

The centric relationThe centric relation

It 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

Page 37: TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible and the cranium. 2.It is a bilateral articulation.

Thank youThank you


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