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Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
Biomechanics Of Temporomandbular Joint
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Biomechanics Of Temporomandbular Joint

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  • 1. TOPIC BIOMECHANICS OFTEMPOROMANDIBULAR JOINT
  • 2. PURPOSETo Give Important InformationAbout How Temporomandibular Joint Works And How ToAppreciate It In Clinical Practice
  • 3. Biomechanics OfTemporomandibular Joint Part I Introduction to Temporomandibular Joint
  • 4. Biomechanics of Temporomandibular Joint Part 1 : Introduction to Temporomandibuular Joint What is Temporomandibular joint?
  • 5. What is Temporomandibular Joint? The Temporomandibular Joint (TMJ) Is The Joint Of The Jaw www.wikipedia.com
  • 6. What is Temporomandibular Joint?The name is derived from the two bones which form the Joint : The temporal bone and the Mandible Temporal Bone Mandible www.wikipedia.com
  • 7. What is Temporomandibular Joint? There are two TMJs, one on each side, working in unison. www.wikipedia.com
  • 8. Biomechanics of Temporomandibular Joint Part 1 : Introduction to Temporomandibuular Joint Differences between Temporomandibular Joint & other joints in the body
  • 9. Differences between TMJ & Other Joints in the Body1.TMJ has an articular disc which compeletely dividesthe joint spaces into upper and lower jointcompartements.Two Joints are connected Superior Joint Cavity Articular Disc Inferior Joint Cavity TMJ Famona.tripod.com
  • 10. Differences between TMJ & Other Joints in the Body2.TMJ is a ginglymoarthrodial joint• Hinge Action (Rotation)• Slide Action (translation) Famona.tripod.com
  • 11. Differences between TMJ & Other Joints in the Body3. Relationship of teeth affects therelationship of the articulating components. Famona.tripod.com
  • 12. Differences between TMJ & Other Joints in the Body4. The mandible is the only bone in the bodyhinged on both ends that is not capable ofindependent movement at one end. Famona.tripod.com
  • 13. Biomechanics OfTemporomandibular Joint Part 2 Introduction to the Biomechanics of TMJ
  • 14. Biomechanics of Temporomandibular JointPart 2 : Introduction to the Biomechanics of TMJ Definition Of Biomechanics
  • 15. ? Biomechanics is the study of thestructure and function of biological systems www.wikipedia.com
  • 16. Biomechanics of Temporomandibular JointPart 2 : Introduction to the Biomechanics of TMJ Biomechanics of TMJ
  • 17. ? Biomechanics of Temporomandibular Joint is a complex combination activity Both the left and right joints mustfunction together in the coordination of jaw movement Okeson, 2008
  • 18. ? FossaArticular disc Condyle Okeson, 2008
  • 19. Biomechanics OfTemporomandibular Joint Part 3 The Joint System
  • 20. BIOMECHANICS OF THETEMPOROMANDIBULAR JOINT Part 3 : The Joint System One Joint System
  • 21. One Joint System Tissues that surrounds the inferior synovial cavityArticular disc Condyle Inferior synovial cavity Okeson, 2008
  • 22. One Joint SystemRotation is the only physiologic movementthat can occur between the surfacesRotation in the TMJ usually occurs onlyduring the opening the mouth 20 – 25 mm Okeson, 2008
  • 23. The condyle is notsliding out of the fossa so, only one joint system is involved = Rotation Movement Okeson, 2008
  • 24. BIOMECHANICS OF THETEMPOROMANDIBULAR JOINT Part 3 : The Joint System Second Joint System
  • 25. Second Joint SystemFree sliding movement of the disc between the surface in the superior cavity, referred to as translation. Superior Fossasynovial cavity Articular disc Okeson, 2008
  • 26. Translation occurs when the mouth opening is more than 25 mm. Okeson, 2008
  • 27. The condyle slides out ofthe fossa to the articular eminence so, not only one joint system is involved = Translation Movement Okeson, 2008
  • 28. Biomechanics OfTemporomandibular Joint Part 4 Articular Disc
  • 29. BIOMECHANICS OF THETEMPOROMANDIBULAR JOINT Part 4 : Articular Disc ? Function Importance
  • 30. BIOMECHANICS OF THETEMPOROMANDIBULAR JOINT Part 4 : Articular Disc ?
  • 31. ?The articular disc is a fibrous extension of the capsule in between the two bones of the joint. www.wikipedia.com
  • 32. BIOMECHANICS OF THETEMPOROMANDIBULAR JOINT Part 4 : Articular Disc Function
  • 33. Function1. Acts as a cushion to absorb stress2. Isolate synovial fluid Okeson, 2008
  • 34. Function3. Divide a joint cavity • Upper & Lower compartmentsSuperior Joint CavityInferior Joint Cavity Okeson, 2008
  • 35. Function4. Determinant of joint movement Rotation Translation Okeson, 2008
  • 36. BIOMECHANICS OF THETEMPOROMANDIBULAR JOINT Part 4 : Articular Disc Importance
  • 37. The ImportanceThe spasm in the masticatory muscles is adirect cause of pressure on the articulardisc inside TMJIf the disc slips out of place or is displaced, itcan prevent the proper movement of thecondyle and cause dysfunction. Okeson, 2008
  • 38. Biomechanics OfTemporomandibular Joint Part 5 Stability Of The Joint
  • 39. BIOMECHANICS OF THETEMPOROMANDIBULAR JOINTPart 5 : Stability of the Joint Anatomic structures Constant activity of the muscle The ligaments Interarticular Pressure
  • 40. BIOMECHANICS OF THETEMPOROMANDIBULAR JOINTPart 5 : Stability of the Joint Anatomic structures
  • 41. Anatomic Structures Every joint in the human body has anatomicstructures which impart stability during function. These structures are : 1. The osseous conformation of the articulating ends of the bones of the joints 2.Muscle which activate joint and stabilize the joint Okeson, 2008
  • 42. Anatomic Structures Every joint in the human body has anatomicstructures which impart stability during function. These structures are : 3. Ligaments which help stabilize the joint by limiting movement 4.Capsule and disc which form a part of a joint Okeson, 2008
  • 43. BIOMECHANICS OF THETEMPOROMANDIBULAR JOINTPart 5 : Stability of the Joint Constant activity of the muscle
  • 44. Constant Activity of the muscles Stability is maintained by constant activity of the muscles that pull accross the joint Elevator muscles • Masseter • Temporalis • Medial pterygoid Okeson, 2008
  • 45. Constant Activity of the musclesIn the resting state, these muscles are ina mild state of contraction called tonus. Okeson, 2008
  • 46. BIOMECHANICS OF THETEMPOROMANDIBULAR JOINTPart 5 : Stability of the Joint The ligaments
  • 47. The LigamentsStabilize the joint by limiting movement Ligaments do not stretch but it could be elongated Elongation of Ligaments could compromise normal joint function Okeson, 2008
  • 48. BIOMECHANICS OF THETEMPOROMANDIBULAR JOINTPart 5 : Stability of the Joint Interarticular Pressure
  • 49. Interarticular PressureThe pressure between the articular surfaces of the eminence and the condyle The Absence of Interarticular pressure will cause the separation of articular surfaces and the joint will technically dislocate Okeson, 2008
  • 50. Biomechanics OfTemporomandibular Joint Part 6 Normal Fuctional movement of Condyle and disc
  • 51. BIOMECHANICS OF THE TEMPOROMANDIBULAR JOINTPart 7 : Normal Functional movement of the condyle and disc Supporting Structures Opening Closing
  • 52. BIOMECHANICS OF THE TEMPOROMANDIBULAR JOINTPart 7 : Normal Functional movement of the condyle and disc Supporting Structures
  • 53. Supporting Structures FossaArticular disc Condyle Superior Lateral Retrodiscal Pterygoid Lamina Inferior Lateral Pterygoid Okeson, 2008
  • 54. BIOMECHANICS OF THE TEMPOROMANDIBULAR JOINTPart 7 : Normal Functional movement of the condyle and disc Opening
  • 55. OPENING During Opening, Superior Lateral Pterygoid is not contracting Inferior lateral Superior pterygoid isretrodiscal contracting – lamina Pulls the head ofstretches & condyle forwardRotates the discposteriorly Okeson, 2008
  • 56. BIOMECHANICS OF THE TEMPOROMANDIBULAR JOINTPart 7 : Part 7 : Normal Functional movement of the condyle and disc Closing
  • 57. CLOSINGOpposes the force of retrodiscal lamina Superior lateral pterygoid pulls the disc anteriorly Okeson, 2008
  • 58. Conclusion :As a clinician, please be familiar with the structures and function of the temporomandibular joint.

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