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Ortho > Removeable appliances > Flashcards

Removeable appliances Flashcards

1
Q

where do the forces that move the teeth come from in the appliance?

A

springs
screws
bows

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2
Q

what are some advantages of removable appliances?

A 
easy to clean
good anchorage
less chairside time
less inventory
moves blocks of teeth
cheap
easy to adjust
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3
Q

what are some disadvantages of removable appliances?

A 
dependent on pt co op
tipping movement only
speech affected
retention is difficult
lower appliance can be difficult to wear
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4
Q

what movements can a removable appliance cause?

A 
tipping
space maintenance
bite opening
crossbite correction
single tooth movement
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5
Q

what are the 4 components of the appliance?

A

baseplate
activator
retention
anchorage

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6
Q

what materials are used in making an appliance?

A

SS 18:8 chromiun :nickel
elgiloy - soft, heat treated to increase strength
acrylic - pmma - self cured heat cured light cured

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7
Q

what is the job of the baseplate?

A

holds components together
active or passive
can hold biteplanes

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8
Q

what is the job of an anterior biteplane?

A

reduce overbite

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9
Q

what is the job of a posterior biteplane?

A

eliminates occlusal interferneces

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10
Q

what is put in a baseplate to make it active?

A

springs

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11
Q

what is the force of the appliance dependent on?

A

length of wire
radius of wire
stiffness of wire

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12
Q

if you increase the length of the wire what happens to the force?

A

lighter force exerted

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13
Q

length of wire is restricted by size of mouth, how can this be fixed?

A

add coils to wire

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14
Q

double the diameter of the wire, force?

double the length?

A

increase forces

decrease forces

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15
Q

tooth movement happens in what direction?

A

perpendicular to point of contact of spring with tooth

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16
Q

if spring is 0.5mm, activation is?

if spring is 0.7mm, activation is?

A

3mm

1mm

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17
Q

palatal springs can cause movement in what direction?

A

mesial
distal
buccal

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18
Q

size of palatal springs?

A
  1. 5mm

0. 7mm molars

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19
Q

buccal canine retractors cause movement of canines in what direction?

A

palatally and distally

20
Q

what size are buccal canine retractors?

how are they activated?

A

0.7/0.5mm with supportive tubing

activated by winding coil or adjusting arm

21
Q

what size are Z springs?

A

0.5mm SS

22
Q

what are Zsprings?

A

double cantilever increasing wire length where space is limited

23
Q

where to Z springs sit?

A

perpendicular to palatal surface

24
Q

how are Z springs activated?

A

pull 1-2mm away from baseplate at angle of 45 degrees in direction of desired movement

25
Q

what size are T springs?

A

0.5mm SS

26
Q

what are T springs used for?

A

move teeth buccally

27
Q

how are T springs activated?

A

pull spring away from baseplate at angle of 45 degrees

28
Q

are bows active or passive?

A

can be either

29
Q

what is the job of an active bow?

A

retraction of proclined incisors

30
Q

what are the sizes of bows?

A

07/0.8mm, 0.5mm if unsupported

31
Q

what is a roberts retractor used for?

A

0.5mm and used to retract incisors

32
Q

what direction to screws move teeth?

A

labiolingually

33
Q

where do screws get force to move teeth?

A

via acrylic contacting tooth and transversley expand

34
Q

how often are screws turned?

A

once a week at start of tx

twice a week further into tx

35
Q

what can screws be used for?

A

to move teeth required for retention

36
Q

how do adams clasps and cribs clasps give retention?

A

engage undercuts at mesio distal

37
Q

what size are adams and cribs clasps?

A
  1. 7mm SS molars

0. 6mm premolars and deciduous teeth

38
Q

what are southend and c clasps used for?

A

anterior teeth

39
Q

what size are southend and c clasps?

how do they give retention?

A

undercut beneath contact point

0.7mm SS

40
Q

how to ball ended hooks work and what size are they?

A

0.7mm

soldered ball engage undercuts interproximally

41
Q

where to labial bows give retention?

how are they activated?

A

anterior retention

squeeze U loop to tighten

42
Q

what is anchorage?

A

forces created as a reaction to a active component provided by - other teeth/baseplate/other forces

43
Q

how is anchorage increased?

A

clasping more teeth

using lighter forces

44
Q

what tools are used to fit appliances?

A 
adams clasps
spring forming pliers
marker
measuring device
acrylic trimmer
45
Q

when can removable appliances be taken out?

A

contact sports

cleaning

46
Q

what problems can happen with these appliances?

A

breakages
loose fitting, falls out
palatal inflammation
excessive tilting

Ortho (10 decks)

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