Anatomy/Biomechanics
Is the there more laxity A/P or M/L in the capsule?
A/P
Masseter action
bilaterally: elevates strongly; protrudes slightly
unilateral: creates ipsilateral excursion
Name 2 MOI.
-trauma
-posture
-emotional factors
-parafunctional habits
-breathing
What is the capsule attached to anteriorly?
superior head of lateral pterygoid muscle
which muscles are involved in opening of the mouth?
inferior head of lateral pterygoid and suprahyoid muscles
What is considered functional opening of the mouth?
2 knuckles or 40 mm.
Early phase is primarily ______ until this ligament _____ gets tensioned.
rotation; oblique lateral ligament
which muscles are involved in closing of the mouth?
Bonus: which on of the ones that close the mouth also retrude??
masster, medial pretygoid, temporalis.
retrudes: temporalis
3-6 mm
Full opening pulls disc anteriorly but is limited in part by what?
superior portion of retrodiscal lamina
Which muscle eccentrically helps to maintain optimal position of disc on condyle?
superior head of lateral pterygoid
How can you assess strength of tongue?
When you push on patient's cheek while patient matches force with tongue
What are the arthrokinematics during right excursion?
Left side (contralateral) moves anterior and medially and inferiorl along articular eminence
which muscles unilterally produce contralateral excursion?
lateral and medial pterygoid
What is a C pattern associated with?
hypomobility due to internal derangement and reduction