equilibrium and etiology Flashcards
how does function influence the form of the dental arches
Changing the pattern of soft tissue pressure afecting equalibitum
what is the environment that affects malocclusion
changing the naturally occuring pressures against the teeth
what is the equalbrium theory of teeth
teeth are located in a position of balance among the opposing forces that are brough to bear on them
why do teeth move during chewing
the alveolar bone bends
what is the roll of the fluid within the pDL
as a shock absorber to transmit first to bone, then squeeze out to create pain
how long do you have to apply force to a tooth to move it
4 hours or more
what has shown to happen after 4 hours of pressure
a second messenger triggers celular changes necessary for tooth movement
- 4 hours to induce cyclic AMP
what controls the extend of thumb suckings effects
how long you suck your thumb
does it take a lot of force to move a tooth
not much force (a few grams)
- but increasing pressure, increases movment up to a point o fpain
are tongue and lip pressures really all that balanced
No
- during swallowing: tongue 50 and lips are 20
what does the unequal pressure of tongue and lips show about equalibrium
they are not the only things important for equilibrium
are resting pressures at balance
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
what besides lips and tongue can provide pressure to teeth
the PDL fibers used in eruption
could clenching lead to tooth movement
yes, but only if you do it for 4 hours, which is not common
could grinding lead to tooth movement
no, enamel is worn, but eruption does not change
what is tongue thrust swallows
as extension of the tip of the tongue between the inciors during swollowingq
is tongue thrust swollow a habit or developmental
it is a developmental stage that is normal (not learned)
how much does tongue thrust affect malocclusion
tongue thrust is 10 times more prevant more prevelent than the amount of open bites (not related)
what races have open and deep bites
Open: blacks
Deep: whites
how could tongue thrust affect occlusion
due to a different location of tongue, even when not swollwing
can you break the habit of tongue thrust swollow?
Its hard to, and may have little affect
can speach problems lead to malocclusion
no, not enough time
-only resting tongue could make a difference
can speech therapy prevent malocclusion
No
what controlls resting pressures
the posture of the head, jaw, and tongue
what is a major influence on posture of the head jaw and tongue
respiration
what did early x-rays show about breathing
Need to lift head early in life to breath
when can babies breath through their mouth
after a few weeks
CAN respiration affect facial growth
Yes, possibly
why would you breathe through your mouth
b/c you have large adenoids
what happens if you’re a mouth breather
long narrow face do to lowered and backward growth of mandible
anterior open bite
what happened once nose adenoids were removed
face reurned back to normal ish
how dose air flow during maximal effort
50% through mouth
50% through nose
how much affect does nasal restriction have on long face patttern
Not a major determinant but could have an effect
what major problem may lead to severe malocclusion
Total nasal obstruction
- cleft palate
- leakage of air into nase during speech
how much of the long face group has less than 40% nasal respiration
1/4
- but most of them are nasal breathers
is impaired nasal respiration the major cause of long face/open bite
No
