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Osteology and the Muscles of Mastication

Explore the anatomy and function of mandible muscles, symptoms, demographics, and treatment options for TMJ disorders. Learn about origins, insertions, actions, and subjective/objective symptoms associated with these conditions.

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Osteology and the Muscles of Mastication

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  1. Osteology and the Muscles of Mastication Lecture #5

  2. Mandible-lateral, exterior view

  3. Mandible-lateral, interior view

  4. Mandibible-Superior view

  5. Cranium view

  6. Maxilla-Inferior view

  7. 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

  8. Masseter Muscle

  9. Temporalis muscle

  10. Medial Pterygoid

  11. Lateral Pterygoid muscle

  12. TMJ/TMD/MPD

  13. TMJ disfunction-Tempromandibular joint disfunction • TMD-Tempromandibular disfunction • MPD-Myofacial pain disfunction

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

  15. 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

  16. 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)

  17. Clicking of the jaw

  18. 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.

  19. NTI appliance

  20. Methamphetamine-Lower anterior

  21. Methamphetamine-Upper anterior

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