2. Osteology and the Muscles of Mastication
Lecture #5

3. Mandible-lateral, exterior view

4. Mandible-lateral, interior view

5. Mandibible-Superior view

6. Cranium view

7. Maxilla-Inferior view

9. Muscles Origin-The stable anchor point of the muscle
Insertion-the anchor point that moves when muscle is contracted
Action-What happens when the muscle is contracted

10. Masseter Muscle

11. Temporalis muscle

12. Medial Pterygoid

13. Lateral Pterygoid muscle

14. TMJ/TMD/MPD

15. TMJ disfunction-Tempromandibular joint disfunction
TMD-Tempromandibular disfunction
MPD-Myofacial pain disfunction

16. Subjective Symptoms Headaches Jaw pain Ringing in the ears
Pain with chewing
Grinding or clenching of teeth
Neck aches
Clicking jaw

17. Objective Symptoms Abnormal wear patterns on the teeth
Deviated path of opening or closing
Three finger rule
Tenderness in muscles, especially the Lateral Pterygoid
“Can you chew a piece of gum comfortably”
Headaches focusing around the temporalis area or above the eyes

18. Demographics of disease
Women have the problem three times as often as men
Problem often occurs after a traumatic event
Depression often comes along with TMD
High stress people (Type A personalities)
Certain jobs which compromise posture. (ie computer jobs)

20. Clicking of the jaw

21. Treatment of disease Conservative versus Aggressive therapy Aggressive
Surgery
Orthodontics
Crown and Bridge or new dentures
Conservative
limiting use of the joint
anti-inflammatory drugs
physical therapy or massage
Exercise
splints to manage grinding
emotional counseling
anti-depressant drugs.

22. NTI appliance

24. Methamphetamine-Lower anterior

25. Methamphetamine-Upper anterior