TMJ ROM

Question 1

functional motions of the TMJ

Answer 1

opening (depression)
closure (elevation)
protrusion
retrusion
right and left excursion

Question 2

what sex typically has more TMJ motion

Answer 2

males

Question 3

which positions of the head affect TMJ MOTION

Answer 3

forward
neutral
retraced
— should be controlled when TMJ measurements are being taken

Question 4

what plane/axis does mandibular depression occur in

Answer 4

sagittal plane
medial-lateral axis

Question 5

what is normal ROM for mandibular depression

Answer 5

40-50 mm

Question 6

testing position/motion for mandibular depression ROM

Answer 6

seated with cervical spine in neutral
asked to open their mouth as wide as possible
distance between upper and lower central incisors are measured
bottom of top incisor to top of lower incisor

Question 7

end feel of mandibular depression

Answer 7

firm

Question 8

what plane does mandibular protrusion occur in

Answer 8

transverse

Question 9

normal ROM for protrusion

Answer 9

6-10 mm

Question 10

position/motion of protrusion testing

Answer 10

seated with cervical spine in neutral
mouth opened slightly and patient is asked to push the chin anteriorly

distance between lower central incisor and upper central incisor are measured

Question 11

end feel for protrusion

Answer 11

firm

Question 12

what plane does lateral deviation occur in the mandible

Answer 12

transverse

Question 13

normal ROM for lateral deviation

Answer 13

8-12 mm

Question 14

position/motion for mandible lateral deviation

Answer 14

seated with cervical spine in neutral
opened slightly, patient asked to move their lower jaw as far as possible to one side

distance between line dividing upper and lower central incisors is measured

Question 15

how are the muscles of mastication graded?

Answer 15

5 - able to perform full range w/o difficulty

3 - motion is performed but with difficulty or only through partial ROM

1 - no motion, contraction

Question 16

muscles involved in elevation of mandible

Answer 16

masseter
medial pterygoid
temporalis

Question 17

elevation of mandible testing motion/procedure

Answer 17

patient to close jaw firmly and clench teeth
palpation of the masseter and temporalis bilaterally to compare symmetry

Question 18

what does the lateral pterygoid do during elevation of the mandible

Answer 18

superior head of lateral pterygoid eccentrically contracts to position the disc between the condyle and articular eminence

Question 19

muscle that controls mandibular depression

Answer 19

lateral pterygoid

Question 20

depression of mandible testing motion

Answer 20

patient asked to open mouth as wide as possible
examiner observes any lateral deviations

Question 21

what muscles assist with depression of the mandible?

Answer 21

suprahyoid muscles
gravity as well

Question 22

what muscles assist in protrusion

Answer 22

medial/lateral pterygoid

Question 23

motion of mandibular protrusion testing

Answer 23

patient pushes jaw forward, moving lower teeth past upper teeth

Question 24

bilateral contraction of the masseters will result in ___ whereas bilateral contraction of lateral pterygoids will result in______

Answer 24

slight protrusion
strong protrusion

Question 25

muscles controlling excursion

Answer 25

medial/lateral pterygoid

Question 26

motion for excursion testing of mandible

Answer 26

deviates jaw to one side

Question 27

when one deviates the mandible to the left during an excursion test, which muscles are activated

Answer 27

left lateral pterygoid
right medial pterygoid

Question 28

how may trigeminal nerve involvement affect a person’s jaw movement

Answer 28

can move the jaw to paralyzed side but cannot move it to the unaffected side