1. MANDIBULAR MOVEMENTS

2. TMJ has a capsule and articulating disc
Two joints are mechanically coupled
Is a synovial joints,,its bony components covered with dense fibrous tissue NOT by hyaline cartilage
Glenoid fossa of temporal bone & condyle of mandible = articulating surface

3. Articular disc divides joints into upper & lower components
Upper components show anterior posterior gliding movement
Lower components show hinge movement
TMJ is capable of function and Para function movements
Movements are similar in dentulous and edentulous patients
Occlusion in complete denture should be in harmony with these movements

5. ***`Mandible moves to carry out functions of
Mastication
Swallowing
Speech
Expression
Para functional habits

6. WHAT MUST I STUDY?????

7. TMJ ARTICULATION Bony structures Fossa & condyles Ligaments
Articular disc (meniscus)
Muscles

8. *****Ligaments (to limit motion in the joint)
Capsular ligament
Tempromandibular ligament
Sphenomandibular ligament
Stylomandibular ligament

9. MUSCLES Temporal muscle Posterior part to retrude the mandible
Middle part elevates it in centric position
No biting force when mandible is in protrusion, so it can be used to determine whether the patient is closing in centric relation.

10. Medial pterygoid muscle
The action of the muscle is an elevator
Does not assist in the lateral or protrusive movements

11. Lateral petrygoid muscle
The principle action is the protrusion of one or both condyles. It guides the mandible into lateral or protrusive positions.

12. Masseter
(elevation)
Remember : extension of buccal flange (disto buccal)

13. MUSCLES OF DEPRESSION Suprahyoid Geniohyoid Mylohyoid Stylohyoid
Platysma
Are the primary movers of the mandible

14. Mylohyoid muscle
Its principle action is to assist in swallowing

15. Opposing teeth are in contact
Movements are controlled by neuromuscular system as limited by the condyles and the guide influences of the contacting teeth
Opposing teeth are not in contact, movements are controlled by musculature as limited by condyles and ligaments.

16. CLASSIFICATION OF JAW RELATIONS
Orientation relation
Mandible can rotate in the sagittal plane
Vertical relations
Amount of jaw separation
Horizontal relation
Front to back and side to side

17. MANDIBULAR MOVEMENTS Rotation concentric circles around a common axis
Transolatory points of the body move in the same velocity and direction

20. AXES OF ROTATION
Saggital
Vertical
Transverse

22. Rotational Movement
Around the sagittal axis

23. Rotational Movement
Around the horizontal axis

24. Rotational Movement
Around the frontal (vertical) axis

25. Opening and closing movements
Lateral excursions
Protrusive movement

28. Bennett Movement & Angle
The angle formed by the sagittal plane and the path of the advancing condyle during lateral mandibular movements as viewed in the horizontal plane.

29. i`m going to study
What about you?????