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Mandibular Movements

Mandibular Movements. Anatomy and Physiology of the Temporomandibular Joint. A close up view of the joint. Basic mandibular movements. The basic condylar movements are: Rotation

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Mandibular Movements

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  1. Mandibular Movements

  2. Anatomy and Physiology of the Temporomandibular Joint

  3. A close up view of the joint

  4. Basic mandibular movements The basic condylar movements are: • Rotation in the lower compartment between the head of the condyle and the disk (without changing the position) • Translation in the upper compartment between the head and the condyle as one unit and the glenoidfossa

  5. Terminal hinge axis Axis of rotation (tansverse, sagital ,vertical ) Terminal hinge axis • It is an imaginary line between the mandibularcondyle around which the condyle rotate during the early openning and late closing (centric relation)can be located arbitary,or by max face bow)

  6. They are usually classified according to the main direction of movement. The starting position is the habitual intercuspal position, from this point the mandible can move into: Possible Mandibular Movements Opening and Closing Movement Lateral Movement Forward & Backward Movement

  7. Opening and closing movement • the opening movement is carried on by 2 types of movements: • a) A hinge (rotary) movement between the heads of the condyles and the discs. • b) A gliding (sliding) movement between the discs and the condylar heads moving as one unit on the articular eminence. • N.B IN FIRST 4 TO 8 MM IS PURE ROTATION WHILE IN FURTHER OPENNING ROTATION AND TRANSLATION

  8. Protrusion and Retrusion The mandible is carried horizontally forward as in moving the lower anterior teeth in front of the upper. This movement takes place principally in the upper joint. CONDYLE MOVE DOWNWARD AND FORWARD

  9. Edge to edge position.

  10. Lateral movement In this movement one condyle ( working) mainly rotates, while the other condyle ( balancing) moves mainly downwards, forwards and medially. The mandible is capable to move as one unit from one side to the other. This bodily shift is called Bennett Movement

  11. Bennett Movement B A L A N C I N G W O R K I N G

  12. The inclination of the condylarpath Types : A- Sagittalcondylar path angle B- Lateral condylar path angle

  13. Condylar Guidance .

  14. Lateral Condylar Guidance .

  15. Incisal Path It is the path traveled by the incisal point during the forward glide of the mandible from the intercuspal position towards the maximum forward positionon.

  16. Incisal Angle It is the angle of inclination of a line extending through the incisal edge of upper and lower anterior teeth, to the horizontal plane.

  17. The Incisal Path . The Incisal Path Angle . Vertical Overlap (overbite) Horizontal overlap The greater the amount of vertical overlap The greater the incisal angle The greater the amount of horizontal overlap The lesser the incisal angle

  18. Incisal Guidance .

  19. Envelope of motion • Posselt s figure

  20. No Translation

  21. Translation

  22. Border Positions of the Mandible

  23. These are positions within the boundaries of border positions. The intra-border Positions

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