equilibrium and etiology

Question 1

how does function influence the form of the dental arches

Answer 1

Changing the pattern of soft tissue pressure afecting equalibitum

Question 2

what is the environment that affects malocclusion

Answer 2

changing the naturally occuring pressures against the teeth

Question 3

what is the equalbrium theory of teeth

Answer 3

teeth are located in a position of balance among the opposing forces that are brough to bear on them

Question 4

why do teeth move during chewing

Answer 4

the alveolar bone bends

Question 5

what is the roll of the fluid within the pDL

Answer 5

as a shock absorber to transmit first to bone, then squeeze out to create pain

Question 6

how long do you have to apply force to a tooth to move it

Answer 6

4 hours or more

Question 7

what has shown to happen after 4 hours of pressure

Answer 7

a second messenger triggers celular changes necessary for tooth movement
- 4 hours to induce cyclic AMP

Question 8

what controls the extend of thumb suckings effects

Answer 8

how long you suck your thumb

Question 9

does it take a lot of force to move a tooth

Answer 9

not much force (a few grams)

- but increasing pressure, increases movment up to a point o fpain

Question 10

are tongue and lip pressures really all that balanced

Answer 10

No

- during swallowing: tongue 50 and lips are 20

Question 11

what does the unequal pressure of tongue and lips show about equalibrium

Answer 11

they are not the only things important for equilibrium

Question 12

are resting pressures at balance

Answer 12

No, with tongue being 1.5 greater than the lips in the lower incisors in addition to lower molars
-upper molars and canines have no tongue pressure

Question 13

what besides lips and tongue can provide pressure to teeth

Answer 13

the PDL fibers used in eruption

Question 14

could clenching lead to tooth movement

Answer 14

yes, but only if you do it for 4 hours, which is not common

Question 15

could grinding lead to tooth movement

Answer 15

no, enamel is worn, but eruption does not change

Question 16

what is tongue thrust swallows

Answer 16

as extension of the tip of the tongue between the inciors during swollowingq

Question 17

is tongue thrust swollow a habit or developmental

Answer 17

it is a developmental stage that is normal (not learned)

Question 18

how much does tongue thrust affect malocclusion

Answer 18

tongue thrust is 10 times more prevant more prevelent than the amount of open bites (not related)

Question 19

what races have open and deep bites

Answer 19

Open: blacks
Deep: whites

Question 20

how could tongue thrust affect occlusion

Answer 20

due to a different location of tongue, even when not swollwing

Question 21

can you break the habit of tongue thrust swollow?

Answer 21

Its hard to, and may have little affect

Question 22

can speach problems lead to malocclusion

Answer 22

no, not enough time

-only resting tongue could make a difference

Question 23

can speech therapy prevent malocclusion

Answer 23

No

Question 24

what controlls resting pressures

Answer 24

the posture of the head, jaw, and tongue

Question 25

what is a major influence on posture of the head jaw and tongue

Answer 25

respiration

Question 26

what did early x-rays show about breathing

Answer 26

Need to lift head early in life to breath

Question 27

when can babies breath through their mouth

Answer 27

after a few weeks

Question 28

CAN respiration affect facial growth

Answer 28

Yes, possibly

Question 29

why would you breathe through your mouth

Answer 29

b/c you have large adenoids

Question 30

what happens if you’re a mouth breather

Answer 30

long narrow face do to lowered and backward growth of mandible
anterior open bite

Question 31

what happened once nose adenoids were removed

Answer 31

face reurned back to normal ish

Question 32

how dose air flow during maximal effort

Answer 32

50% through mouth

50% through nose

Question 33

how much affect does nasal restriction have on long face patttern

Answer 33

Not a major determinant but could have an effect

Question 34

what major problem may lead to severe malocclusion

Answer 34

Total nasal obstruction

• cleft palate
• leakage of air into nase during speech

Question 35

how much of the long face group has less than 40% nasal respiration

Answer 35

1/4

- but most of them are nasal breathers

Question 36

is impaired nasal respiration the major cause of long face/open bite

Answer 36

No