final test Flashcards
two joints of TMJ
ginglymoid and arthodial
ginglymoid movement
hinge
arthodial movement
gliding
functioning part of mandibular fossa
articular eminence
non functioning part of mandibular fossa
articular fossa
what ligaments of the mandible limits protrusion
stylomandibular
sphenomandibular
what ligament(s) prevents mandible from going too far back
colateral ligaments (2 parts)
two parts of collateral ligament
internal horizontal portion
outer oblique portion
action of temporal is muscle
eleveate and retrude mandible
insertion of temporalis
coronoid process
anterior border or ramus
temporal crest
orgin and insertion of medial pterygoid muscle
orgin- pterygoid fossa
insertion- medial angle of mandible
lateral pterygoid muscle action
both, protrude, depress mandible
orgin and insertion of lat. pterygoid
orgin- lateral pterygoid plate
insertion- condylar process of mandible
orgin and insertion of digastric
orgin-
post- mastoid notch
ant- medial angle of mandible
insertion-
post and ant.- hyoid
what muscles protrude mandible
both lat. pterygoids together
masseter and medial pterygoid
innervatoin of TMJ
auriculotemporal (part of CN V)
main innervation of muscle of mastication
Trigeminal
3 arteries of the TMJ
superficial temporal
middle meningeal
internal maxillary
if the force vector passes through the bite point what does that mean
TMJ does not need to be loaded, does not function as a lever
what species is TMJ not loaded?
rat
red fox has carnassial teeth meaning what
teeth for tearing food
pinnate muscle arrangement is a _____ saving adaptation
space
power generating muscle arragnement
pinnate
movement muscle arrangement
strap
which muscles of mastication are strap?
lat. pterygoid
digastrics
most efficient class system (jaw muscle-Joint lever)
1st class
lever efficiency depends on ratio of..
d1 and d2. decrease this number correlates to increase efficiency
example of 1st class
(PFW) axis of cervical spine
example of 2nd class
PWF wheelbarrow. front view of mandible
example of 3rd class
least efficient, biting, drawbridge
d1 is between which two variable
F and W
(MA) mechanical advantage along the mandible _______ with the distance from the TMJ
increases
muscle fibers that express ____ types of myosin are found _____ to the joint and vise versa with ____ types
fast
close
slow
two phases of closing movement
crushing and guiding
chewing stroke on working side
incisors and molars start anteriorly at opening and returns from a posterior position
great lateral movement when food is ____ into mouth
introduced
harder food creates ____ chewing strokes
broader
greatest amount of force during mastication is placed what two teeth area
2nd premolar, 1st molar
somatic swallowing
during swallowing teeth come together in MI position to stabilize the mandible in order for the supra hyoid and infra hyoid to contract and control
viceral swallow
occurs in infants and adults with no teeth. mandible is braced by placing the tongue forwards and between the dental arches or gum pads
M sound used for what
evaluate the amount of incisal display at rest
functional response of the alveolar bone and gingival fibers surrounding the teeth help them drift how
mesial, towards the midline
mandibular teeth, all inclined which direction
mesial, posterior also slightly lingually
max teeth anterior inclined where? posterior?
anterior- mesially inclined
post- distall inclined, also bucally
two planes of occlusion
curve of sped
curve of wilson (both concave)
curve of spee
anteriorposterior
curve of wilson
bucall lingual
occlusal table
area of a posterior tooth between the buccal and lingual cusps
which arch is smaller length wise
mandibule
what is the vertical dimension of occlusion at rest
2-3 mm
centric cusp do what
maintaining the vertical dimension of occlusion and triturate food during mastication
noncentric cusp
maintain the bolus of food on the occlusal table during mastication, they assist in shearing food and minimize tissue impingement.
centric relation
anterior-superior most retruded condyle position bilaterally
most retruded functional position of the mandible
teeth not required
what ligament in the TMJ limits normal rotational opening movements?
outer oblique
what ligament in the TMJ limits the posterior movement of the condyle and sic
inner horizontal
what ligament limits protrusive movement of the mandible
stylomandibular
in centric relation what is RCP?
first tooth contact on arc of closure
two movements of border diagram
condylar rotation 20-25 mm
condylar translation 50 mm
functional range of movement is what
diastase between ICP and CR in border diagram
movement in transverse plane is called what
gothic arch tracing
deviations during opening/closing is caused by what
usually by disc derangements.
deflection caused by what
extra or intra intracapsular disorders
crepitation
multiple gravel like sound and commonly associated with osteoarthritic changes of the articular surfaces of the joint
what percentage of people have CR coincide with ICP
10%
type of disclusion in lateral excursive movements
canine disclusion balance occlusion (group function)
history of occlusion, 1925 sears called it
balanced occlusion
new centric relationship
condyles are in their most superoanterior position. coincides with (MS) musculoskeletally
lowest EMG recording of muscles at what two measurements
7-8 mm
2-4 mm
optimal tooth contacts is what
even and simultaneous contact with as many teeth as possible. (less load is transferred to joint)
forces on teeth are directed through the ____ _____
periodontal ligament
axial loading
process of directing occlusal forces through the long axis of the tooth
axial loading methods…tooth contacts on either _____ or ______
cusp tips
relatively flat surfaces that are oriented perpendicular to the long axis
axial loading method on cusp tips called what
tripodization
T/F anterior teeth can with stand greater forces applied to them
false, posterior teeth can.
which teeth are suited best to withstand horizontal forces
canines
canine guidance is what
max. and mand. canines contact in laterotrusive excursions
this disoccludes the posterior teeth
alternative to canine guidance
group function
which teeth would you rather participate in group function
pre molars or MB cusp of 1st molar. posterior = undesirable
anterior disclusion is what
during protrusive movements you have no posterior contacts
T/F you want posterior contacts heavier than anterior?
True
condylar guidance is considered to be a ______ factor
fixed. because is inalterable in a healthy patient.
the more the plane of occlusion diverges from the angle of the eminentia=
the longer the cusps
the more parallel the plane of occlusion to the angle of the eminentia=
the shorter the posterior cusps
what are two factors affecting bennett movement (side shift, LTM)
medial wall (more medial greater the LTM) TM ligament
posterior teeth located distal to the radius will need ____ cusps than those located mesial to the radius
shorter
longer radius (curve of spee) =
flatter place of occlusion
the more immediate the lateral translation, the _____ is the posterior cusp
shorter
