Biomechanics Of Temporomandbular Joint
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The temporomandibular joint (TMJ) connects the mandible to the temporal bone and allows for hinge and sliding motions. It has an articular disc that divides it into upper and lower compartments. During opening, the inferior lateral pterygoid muscle contracts to pull the condyle forward while the retrodiscal lamina stretches. During closing, the superior lateral pterygoid muscle pulls the disc anteriorly to oppose the retrodiscal lamina. The TMJ relies on surrounding muscles, ligaments, the articular disc, and interarticular pressure for stability during function. Understanding its biomechanics is important for clinical practice when treating TMJ disorders.
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Biomechanics Of Temporomandbular Joint
- 1. TOPIC BIOMECHANICS OF TEMPOROMANDIBULAR JOINT
- 2. PURPOSE To Give Important Information About How Temporomandibular Joint Works And How To Appreciate It In Clinical Practice
- 3. Biomechanics Of Temporomandibular 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 Body 1.TMJ has an articular disc which compeletely divides the joint spaces into upper and lower joint compartements. Two Joints are connected Superior Joint Cavity Articular Disc Inferior Joint Cavity TMJ Famona.tripod.com
- 10. Differences between TMJ & Other Joints in the Body 2.TMJ is a ginglymoarthrodial joint • Hinge Action (Rotation) • Slide Action (translation) Famona.tripod.com
- 11. Differences between TMJ & Other Joints in the Body 3. Relationship of teeth affects the relationship of the articulating components. Famona.tripod.com
- 12. Differences between TMJ & Other Joints in the Body 4. The mandible is the only bone in the body hinged on both ends that is not capable of independent movement at one end. Famona.tripod.com
- 13. Biomechanics Of Temporomandibular Joint Part 2 Introduction to the Biomechanics of TMJ
- 14. Biomechanics of Temporomandibular Joint Part 2 : Introduction to the Biomechanics of TMJ Definition Of Biomechanics
- 15. ? Biomechanics is the study of the structure and function of biological systems www.wikipedia.com
- 16. Biomechanics of Temporomandibular Joint Part 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 must function together in the coordination of jaw movement Okeson, 2008
- 18. ? Fossa Articular disc Condyle Okeson, 2008
- 19. Biomechanics Of Temporomandibular Joint Part 3 The Joint System
- 20. BIOMECHANICS OF THE TEMPOROMANDIBULAR JOINT Part 3 : The Joint System One Joint System
- 21. One Joint System Tissues that surrounds the inferior synovial cavity Articular disc Condyle Inferior synovial cavity Okeson, 2008
- 22. One Joint System Rotation is the only physiologic movement that can occur between the surfaces Rotation in the TMJ usually occurs only during the opening the mouth 20 – 25 mm Okeson, 2008
- 23. The condyle is not sliding out of the fossa so, only one joint system is involved = Rotation Movement Okeson, 2008
- 24. BIOMECHANICS OF THE TEMPOROMANDIBULAR JOINT Part 3 : The Joint System Second Joint System
- 25. Second Joint System Free sliding movement of the disc between the surface in the superior cavity, referred to as translation. Superior Fossa synovial cavity Articular disc Okeson, 2008
- 26. Translation occurs when the mouth opening is more than 25 mm. Okeson, 2008
- 27. The condyle slides out of the fossa to the articular eminence so, not only one joint system is involved = Translation Movement Okeson, 2008
- 28. Biomechanics Of Temporomandibular Joint Part 4 Articular Disc
- 29. BIOMECHANICS OF THE TEMPOROMANDIBULAR JOINT Part 4 : Articular Disc ? Function Importance
- 30. BIOMECHANICS OF THE TEMPOROMANDIBULAR 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 THE TEMPOROMANDIBULAR JOINT Part 4 : Articular Disc Function
- 33. Function 1. Acts as a cushion to absorb stress 2. Isolate synovial fluid Okeson, 2008
- 34. Function 3. Divide a joint cavity • Upper & Lower compartments Superior Joint Cavity Inferior Joint Cavity Okeson, 2008
- 35. Function 4. Determinant of joint movement Rotation Translation Okeson, 2008
- 36. BIOMECHANICS OF THE TEMPOROMANDIBULAR JOINT Part 4 : Articular Disc Importance
- 37. The Importance The spasm in the masticatory muscles is a direct cause of pressure on the articular disc inside TMJ If the disc slips out of place or is displaced, it can prevent the proper movement of the condyle and cause dysfunction. Okeson, 2008
- 38. Biomechanics Of Temporomandibular Joint Part 5 Stability Of The Joint
- 39. BIOMECHANICS OF THE TEMPOROMANDIBULAR JOINT Part 5 : Stability of the Joint Anatomic structures Constant activity of the muscle The ligaments Interarticular Pressure
- 40. BIOMECHANICS OF THE TEMPOROMANDIBULAR JOINT Part 5 : Stability of the Joint Anatomic structures
- 41. Anatomic Structures Every joint in the human body has anatomic structures 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 anatomic structures 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 THE TEMPOROMANDIBULAR JOINT Part 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 muscles In the resting state, these muscles are in a mild state of contraction called tonus. Okeson, 2008
- 46. BIOMECHANICS OF THE TEMPOROMANDIBULAR JOINT Part 5 : Stability of the Joint The ligaments
- 47. The Ligaments Stabilize 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 THE TEMPOROMANDIBULAR JOINT Part 5 : Stability of the Joint Interarticular Pressure
- 49. Interarticular Pressure The 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 Of Temporomandibular Joint Part 6 Normal Fuctional movement of Condyle and disc
- 51. BIOMECHANICS OF THE TEMPOROMANDIBULAR JOINT Part 7 : Normal Functional movement of the condyle and disc Supporting Structures Opening Closing
- 52. BIOMECHANICS OF THE TEMPOROMANDIBULAR JOINT Part 7 : Normal Functional movement of the condyle and disc Supporting Structures
- 53. Supporting Structures Fossa Articular disc Condyle Superior Lateral Retrodiscal Pterygoid Lamina Inferior Lateral Pterygoid Okeson, 2008
- 54. BIOMECHANICS OF THE TEMPOROMANDIBULAR JOINT Part 7 : Normal Functional movement of the condyle and disc Opening
- 55. OPENING During Opening, Superior Lateral Pterygoid is not contracting Inferior lateral Superior pterygoid is retrodiscal contracting – lamina Pulls the head of stretches & condyle forward Rotates the disc posteriorly Okeson, 2008
- 56. BIOMECHANICS OF THE TEMPOROMANDIBULAR JOINT Part 7 : Part 7 : Normal Functional movement of the condyle and disc Closing
- 57. CLOSING Opposes 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.