9 of final

Question 1

pts may have a less than ideal occlusion, however it may still be a

Answer 1

functionally acceptable occlusion or a physiologically acceptable occlusion

Question 2

term used to define a position of the condyles in relation to the disc and fossa

Answer 2

centric relation

Question 3

most anteriorsuperior position in the glenoid fossa, braced up on intermediate zone of disc, terminal hinge for mand

Answer 3

centric relation

Question 4

CR only refers to

Answer 4

joints and does not involve the teeth

Question 5

why CR ideal

Answer 5

musculature in CR and TMJs in CR

Question 6

what are the muscles that stabilize the TMJs are mainly:

contraction of these muscles results in

Answer 6

massesters and medial pterygoids

results in antero-superior vector of force (stability)

Question 7

what muscles are most relaxed in CR

Answer 7

lateral pterygoid

Question 8

in CR, the condyles rest against the ______of the articular eminence (thickest bone) therefore can tolerate higher stresses

Answer 8

posterior slope

Question 9

condyles are braced gently against intermediate zone of disc (non-innervated and avascular zone) therefore

Answer 9

higher stresses can be tolerated since not vascularized

Question 10

posterior teeth are loaded mainly along the long axis of the tooth:

Answer 10

axial loading

Question 11

in multiple (optimal functional occlusion) the more teeth that contact, the

Answer 11

more stress is distributed throughout the arch

Question 12

in even (optimal functional occlusion) all ____teeth should contact evenly! this distributes the stress over all the teeth and does not concentrate it on one tooth causing harm

Answer 12

all posterior teeth

Question 13

this (optimal functional occlusion) is for stability. if tooth contacts occur only on the right side and not left, then the mandible will pivot around this right side contact and place increased pressure on the left TMJ causing problems

Answer 13

bilateral

Question 14

the teeth should be ______LOADED through the _____axis of the tooth. lateral forces on the teeth are not accepted

Answer 14

axially loaded through long axis

Question 15

anterior teeth should have ___occlusal contacts when posterior teeth are in occlusion.

since ant teeth are not axially loade, they are not able to withstand high loads

Answer 15

lighter

Question 16

when the mand moves laterally, the canines on the working side guide the movement causing all other teeth to disclude

Answer 16

canine guidance

Question 17

in protrusive movement, the anterior teeth should disclude the posterior teeth

Answer 17

anterior guidance

Question 18

the canines, central and lateral incisors disclude the posterior teeth, when the mandible moves in protrusion

Answer 18

anterior guidance

Question 19

during anterior guidance, contacts between the posterior teeth during excursive movements are considered _____ and can create damaging effects on teeth and periodontium

Answer 19

interferences

Question 20

why is canine guidance/anterior guidance the optimal occlusal scheme?

Answer 20

1. mandible- class III lever ???
2. more anterior(away from fulcrum), the resistance load occurs, the lesser the impact (magnitude)
3. the canines have the longest roots and best bone support (canine eminence)

Question 21

optimal functional occlusion is also referred to as

Answer 21

mutually protected occlusion (further from fulcrum)

Question 22

in mutually protected occlusion, the anterior teeth disclude the posterior teeth in excursive movements, thereby protecting the posterior teeth from

Answer 22

off-axis loading

Question 23

when the mandible moves laterally, the mand is guided by the outer inclines of mand buccal cusps sliding along the inner inclines of the buccal cusps of max posterior teeth

Answer 23

group function

Question 24

the most desirable group function consists of the

Answer 24

canine, premolars and MB cusp of first molar

Question 25

in group function, the more ___the contacts, the greater the force

the _____to the source of power, the more destructive the forces

Answer 25

posterior- better
closer- bad

Question 26

group function is acceptable but not ideal. this is the only option for patients who:

Answer 26

1. have no ant vertical overlap (anterior open bite)
2. very large anterior horizontal overlap (class II division I; deep bite)
3. reverse overlap (class III)

Question 27

simultaneous contacts on both sides (working and non-working sides) during lateral excursive movements
contacts between ant and post teeth

Answer 27

balanced occlusion

Question 28

in balanced occlusion during protrusive movements, mesial inclines of mand cusps occlude with ____ inclines of max cusps

Answer 28

distal

Question 29

balanced occlusion type patients:

Answer 29

1. not for dentate pts- would promote tooth wear
2. acceptable for denture patients