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Ortho > Removeable appliances > Flashcards

Removeable appliances Flashcards

1
Q

how can forces be applied on a removeable applaince

A

spings
bows
screws

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2
Q

name 7 advantages of removable appliances

A

easy to clean
good anchorage (resistance to unwanted tooth movements)
can move blocks of teeth
cheap
less chairside time than fixed appliances
less inventory
easy to adjust

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3
Q

name 6 disadvantages of removable appliances

A 
dependant on pt cooperation
only tipping movement- less than fixed
lower RA difficult to wear
Retention difficult- especially lower due to tongue and teeth which tend to tip linually
speech may be affected
technician assiatance
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4
Q

define anchorage

A

way of resisting movement of a tooth using different techniques

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5
Q

which tooth movements can a RA achieve

A 
tipping
space maintenance
bite opening
crossbite correction
single tooth movement
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6
Q

what are the components of a removable appliance?

A

Baseplate
Activation
Retention
Anchorage- usually basplates

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7
Q

name 3 materials used to make RA

A

stainless steel
Eligiloy
Acrylic- polymerising polymethyl methacrylate

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8
Q

what material is a baseplate usually made out of

A

acrylic

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9
Q

what is the function of a baseplate

A

hold all components together

can add bite planes- for bite opening

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10
Q

what can be added to a baseplate

A

biteplanes- for bite opening

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11
Q

how does an anterior bite plane work and what does it reduce

A

no posterior occlusion, allowing posterior teeth to erupt

can reduce overbite

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12
Q

how does a posterior bite plane work and what can it correct

A

no anterior occlusion, allowing them to erupt

correct anterior open bite and can push a tooth /over the bite’

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13
Q

what 3 things is force dependant on

A

length of wire
radius of wire
elastic modulus (stiffness) of wire

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14
Q

what happens to the force if the length of wire in increased

A

light force with longer length

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15
Q

if the length of a wire is doubled, how much is the force reduced by?

A

8X

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16
Q

if the diameter of a wire is double, by how much does the force increase by

A

16X

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17
Q

Length of wire is restricted by amount of space in the mouth, how can you overcome this

A

add coils

18
Q

name 6 methods of tooth movements (activation)

A 
palatal springs
buccal canine retractors
z springs
T springs
Bows
Screws
19
Q

what type of movement is a palatal spring used for

A

mesio-distal and buccal

20
Q

what is in place to stop the palatal spring coming away from the baseplate

A

guard wire

21
Q

which direction does a buccally placed canine retractor move teeth

A

palatally and distally

22
Q

what is a z spring made from

A

stainless steel

23
Q

how is a buccal canine retractor activated

A

winding up coil or adjusting anterior arm

24
Q

how is the length of a z spring increased

A

double cantilever

25
Q

how is a z spring placed

A

perpendicular to palatal surface otherwise slides incisally and intrudes

26
Q

which direction does a t spring move teeth and which teeth

A

buccally

usually canine and premolars

27
Q

what can active bows be used for

A

retract proclined incisors

28
Q

name an appliance that can be used to retract proclined incisors

A

roberts retractor

29
Q

in which direction do screws move teeth?

A

labio-linguallly

30
Q

what are disadvantages of using screws for activation

A

expensive

bulky

31
Q

how does a screw transmit forces

A

via acrylic contacting the teeth

32
Q

what can be used for retention

A

Adams clasps/cribs
Southend Clasps
Labial Bows- anterior retention

33
Q

what can be used for anterior retention

A

labial bows

34
Q

how can anchorage be provided

A

other teeth

baseplate

35
Q

what equipment is used to fit an appliance

A

Adams pliers
Marker
Measuring device
Acrylic trimmer

36
Q

how long should a pt usually wear a RA

A

24 hours- only remove for cleaning and contact sport

37
Q

Which type of activation does a pt have control of?

A

Screws- adjust themselves with key

38
Q

how much tooth movement should be expected in first review

A

1mm in 2-3 weeks of fit

39
Q

what causes palatal inflamamtion

A

poor OH, fungal and bacterial infection

40
Q

what can cause excessive tilting of teeth

A

spring not at correct point of contact so excessive forces on teeth

Ortho (10 decks)

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