TMJ Flashcards
what sort of cartilage are the TMJ and disk covered in?
fibrocartilage
in which cavities do rotation and translation occur in?
rotation occurs in inferior cavity; translation occurs in superior cavity
which portion of the disc is aneural?
the intermediate (middle)
what are the unilateral and bilateral contraction results of the masseter?
uni: slight lateral deviation to same side
bi: elevation of mandible
unil and bil contraction results of temporalis?
unil: deviation to same side
bi: elevate and retract mandible
unil and bil contraction results of lat pterygoid?
unil: contralateral excursion
bil: protrusion
action of suprahyoid muscles?
depression and retrusion of the mandible during closing
infrahyoid muscle action?
stabilize hyoid bone to form a firm base for the suprahyoids
unil and bil function of medial pterygoid
unil: contralateral deviation
bil: elevation and protrusion
normal ROM for depresion is…
between 40-45 mm for males and 45-50 mm for females
approx 4 fingers width of the nondominant hand
functional ROM for depression is…
~35 mm or 3 fingers width
normal lateral excursion is…
1/4 of opening range
normal protrustion and retrusion are…..
6-9 mm protrusion; 3 mm retrusion
key findings in ADDwoR
no clicking noise during opening/closing with possible limited opening (disc blocking condylar head) or no limitation opening (disc completely displaced anteriorly)
key findings in ADDwR
click on both opening and closing (clicks on to the disk in opening and off the disc in closing)