10. Destructive: All Muscles |
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Opening motion with jaw joint out-of-place
focusing on muscle tension and contraction. |
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Purposes |
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Show how an acquired bite with the joint out of centric relation requires the jaw joint be "braced" by two opposite functioning muscles - lateral pterygoids and elevators - to hold the joint on the slope of the eminence. |
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How this strains the muscles and articular disc. |
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Presenting |
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Focus the client on seeing how the red lines don't line up and the condyle is not all the way up into the socket. |
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If you know how many millimeters the client's bite is forward of centric, you can use the millimeter scale to show them where their condyle is relative to CR. |
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Point out the lateral pterygoid has to be contracted as the bite is held forward to keep the teeth in contact. |
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Explain that this is not normal muscle function i.e. when the mouth is closed you're not supposed to be holding your jaw forward. |
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State this acquired bite is very common and has usually been that way since growth and development of the jaw stops or since the bite was altered during orthodontics or full mouth reconstruction. |
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