dentistry,mandibular movement By: Dr Mohamed Elkhodary Saad Eldeen Asso. Prof. of prosthodontic www.elkhodary.net Factors regulate mandibular movement Anatomic Considerations Tempromandibular joint Muscles Ligaments Basic Mandibular Movements Opening and closing Protrusive (forward) Retrusive (backward) Lateral Practical Significance of Studying Mandibular Movements Practical application of Mandibular Movements

1. Mandibular movement

2. Dr Mohamed Elkhodary Saad
Eldeen
Asso. Prof. of prosthodontic
www.elkhodary.net
mohamed.elkhodary@hotmail.com

6. Mandibular Movements
• Factors regulate mandibular movement
• Anatomic Considerations
• Tempromandibular joint
• Muscles
• Ligaments
• Basic Mandibular Movements
• Opening and closing
• Protrusive (forward)
• Retrusive (backward)
• Lateral
• Practical Significance of Studying Mandibular
Movements
• Practical application of Mandibular Movements

7. Factors regulate mandibular
movement
1.Intiating position or centric relation •
2.Influence of opposing tooth contact •
3.Axis of mandibular rotation •
4.Muscles. •
5.Neuromuscular regulate mandibular •
movement.
6.Anatomy and physiology of TMJ. •

8. TMJ
: is a bilateral joints permits the mandible to move as a unit with two
functional patterns:
• Hinge (inferior portion)
• Translation (superior portion) (ginglymoarthroidal
joint) (compound joint)
it has four anatomical parts:
1- condyle
2- articular fossa
3- articular disc
4- articular capsule

9. Articular Disk (Meniscus)
• Biconcave oval structure
interposed between the
condyle and the temporal bone

11. Ligaments :
1-collateral(discal)
2-capsular
3-tempromandibular
4-sphenomandibular
5-stylomandibular

12. Muscles of mastication:
1- masseter: superficial & deep
2- temporalis
3- medial pterygoid
4- lateral pterygoid: superior & inferior
- Digastric muscles is not a muscle of
mastication but it play an important role in
mandibular function.

13. Temporalis

14. Pterygoids

15. Digastric – assists opening of mouth

16. TMJ Capsule

17. TMJ Capsule

18. Posterior band of articular disc
Anterior band of articular disc
Mandibular condyle (head)
Lateral pterygoid muscle raphe
Lower head of lateral pterygoid muscle
Posterior disc attachment

19. Mandibular condyle (head)
Articular disc

20. MRI and autopsy
sections: upper row
oblique sagittal
MRI, asymptomatic
volunteer: left
lateral, middle
medial, right
opened mouth

21. Partial anterior disc displacement at baseline
lateral sections central sections open-mouth

22. Complete anterior disc displacement
medial section Autopsy Open-mouth
MRI

23. Lateral disc displacement and normal bone

24. Medial disc displacement
coronal MRI Oblique coronal MRI

25. The sagittal, frontal, and
horizontal planes of reference

26. TMJ Motions

27. TMJ Motions

29. A. Transverse axis. B. Sagittal
axis C. Vertical axis

31. The relation of the head of the
condyle to the fossa

37. Opening

38. Opening

39. Opening

40. Opening

45. Posselt’s
Figure

46. Posselt’s Investigations

47. Posselt’s Investigations

50. Significance of studying
mandibular movements:
• Designing, selection, and adjustment of
articulator.
• Developing tooth form for dental restorations.
• Understanding the basic principles of
occlusion.
• Diagnosis and treatment of TMJ
disturbances.
• Preserving periodontal health.
• Arrangement of artificial teeth.

51. Practical application of Mandibular
Movements
• Change vertical dimension on articulator.
• Christenson phenomena
• Condylar path & incisal path.
• Condylar guidance & incisal guidance
• Gothic arch.