Normal Chewing Movements

Question 1

Normal Chewing has _____ appearance

makes occlusal contact ONLY after _____ ____

Answer 1

vertical

complete chew

Question 2

parafunction chewing aka bruxing are:

1)

2)

Answer 2

sustained static clenching

dynamic eccentric bruxing

Question 3

TF

natural mandible bends up to 1mm during function

Answer 3

true

Question 4

the mandible is NARROWER bt the _____ angles at the ____ jaw opening.

Answer 4

narrow bt the gonial angles at wide jaw opening

Question 5

waht is the response to the mand bending

Answer 5

mandibular tori [not confirmed]

Question 6

waht is the issue with the mand bending clinically wise

Answer 6

mand full arch bridge

Question 7

would the mand bending be an issue for a full arch resotration in the upper jaw?

Answer 7

no

Question 8

what is a solution to the mand bending for full arch resotrations in the lower jaw?

Answer 8

full arch restorations are divided into segments:

1) permitting stress to be segmented
2) tolerate minor movements

Question 9

In what jaw movement does the direction of the mand arch width INCREASE while all the other movments DECREASE:

a. opening
b. protrusion
c. retrusion
d. opening against force
e. retruding biting on object

Answer 9

retrusion

Question 10

Condyles on the articulator follow the _____ wall fossae in:

1)

2)

3)

Answer 10

superior wall of the fossae

1) opening jaw
2) mediotrusion
3) protrusion

Question 11

natural working side condyles follow

____ path to the SUPERIOR fossae wall

on

jaw ______

Answer 11

inferior path

on

jaw closure

Question 12

TF

articulator is set to border positions and movements of Posselt’s Envelope of Motion whereas

normal chewing mostly occurs at INFRABORDER positions

Answer 12

true

Question 13

TF

if the articulator is set to MAX border movments W/O interferences then INFRABORDER movments in the more central part of the envelope of motion will also be W/O OCCLUSAL INTERFERENCES

Answer 13

true

Question 14

TF

normal jaw opening is a MIX of hinge and translating opening rather than the posterior border opening pathway [hinge opneing in the first 2 cm of opening followed by condyle translation opening]

Answer 14

true

Question 15

TF

articulator can represent:

abnormal

stress tension

painful jaw muscle function

habits

TMJ catching or clicking

increase in joint spaces [condylar distraction]

Answer 15

false

CAN NOT REPRESENT:

abnormal

stress tension

habits

TMJ catching or clicking

condylar distraction w/ incrase in joint spaces

Question 16

waht is an idealized occlusion

Answer 16

1) cuspal contacts
2) good anterior guidance

Question 17

TF

idealized occlusion [cuspal contacts and good anterior guidance] is a good predictor of absence of TM joint or jaw muscle pain or dysfunction.

Answer 17

false

occlusal variation explains less than 5 - 20% of differences of TM pt and normal pt

Question 18

TF

articulator can determine the proper VDO

Answer 18

false

Question 19

waht is VDO

Answer 19

1) vertical separation of the jaws when the teeth are in occlusion
2) length of the face when the teeth are in contact and the mandible or the teeth are in centric relation

Question 20

waht is centric relation

Answer 20

1) reference point to record the maxillomandibular relationship independent of the tooth position
2) repeatable, recordable, learnable
3) relation of the mandible to the maxilla when the condyles are in the most anterior/superior position in the glenoid fossa from which unstrained lateral movements can be made.

Question 21

TF

articulator can not determine the arrangment of the anterior teeth is compatible with normal articulation of vocal sounds

Answer 21

true

Question 22

TF

normal TM joint have slight resiliency to compression loading while the articulator does not

Answer 22

true

Question 23

TF

the mouth is the best articulator

Answer 23

false

lingual cusp relationships cant be visulaized by direct clinical exam

Question 24

TF

Indirect setting of an articulator by using protrusive, laterotrusive, and RCP interocclusal records may reveal occlusal contacts that were not revealed clinical

Answer 24

true

muscle splinting or pain may prevent the jaw coming into border relationship in the mouth

Question 25

the shape of the chewing cycle depends on:

1

2

Answer 25

1) type of food masticated
2) degree of occlusal wear

Question 26

waht are empty jaw movments

Answer 26

jaw movments w/o food in the oral cavity

includes oral maintence and swallowing functions

Question 27

empty chewing movement

Answer 27

stimulated chewing movements W/O food bolus