The first phase of mandibular depression occurs in the ____________________ joint and consists of anterior ____________________ of the condylar head
a. upper, rotation
b. lower, rotation
c. upper, translation
d. lower, translation
ANS: B
Mandibular depression or mouth opening occurs in two phases: rotation and glide (translation). In
the rotation phase, there is pure anterior rotation of the condyle on the disc occurring in the lower
joint space. The second phase involves translation of the disc-condyle complex anteriorly and
inferiorly along the articular eminence. There are some newer models of motion that indicate these
two activities may occur more simultaneously, but rotation still appears to initiate the process.
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