TEMPROMANDIBULAR JOINT AND MOVEMENTS MANDIBULAR [ T M J ] 1.Is the articulation between the mandible...
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TEMPROMANDIBULAR JOINT ANDMOVEMENTS MANDIBULAR
[T M J]
1. Is the articulation between the mandible and the cranium .
2. It is a bilateral articulation .
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AnatomyAnatomy1. Articular fossa and
eminence .
2. Condylar head .
3. Articular disc (meniscus).
4. Articular capsule (capsular ligament) .
5. TMJ ligament .
6. Synovial membrane .
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Muscles of mastication
1. Temporalis .
2. Masseter .
3. Medial pterygoid .
4. Lateral pterygoid .
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Temporalis
Masseter
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THE BASIC MOVEMENTS OF THE MANDIELE
1. Rotation Movement
= hinge movement .
1. Translation Movement
(gliding movement.)
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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
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Gliding or translationGliding or translation
It is the body movement of the mandible.It occurs in the upper compartment.
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Condyle in retroded .no movement position
Condyle performing rotation=hinge movement Condyle
performing anterior translation=gliding.
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intercusbal intercusbal position from position from which hinge which hinge movement will movement will startstart
No TranslationNo Translation
Sagittal view=lateral view
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TranslationTranslation
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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.
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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.
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Incisal pathIncisal path
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Condylar pathCondylar path
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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
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No TranslationNo Translation
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TranslationTranslation
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Posselt’s Posselt’s FigureFigure
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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
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Edge to edge position.
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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
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Anterior biting to reverse vertical overlap.
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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
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The Condylar Path
1. Horizontal Condylar Path .
2. Lateral Condylar Path .
3. The Condylar Path Angle .
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22 . .Vertical relationsVertical relations..
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Vertical Dimension of rest
The vertical dimension of the face when the mandible is in rest position.
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Vertical Dimension of occlusion
The vertical dimension of the face when the teeth are in contact in centric occlusion.
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Freeway space= V.D.R. – V.D.O. = 2-4mm
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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
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Thank youThank you