Removeable appliances

Question 1

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

Answer 1

springs
screws
bows

Question 2

what are some advantages of removable appliances?

Answer 2

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

Question 3

what are some disadvantages of removable appliances?

Answer 3

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

Question 4

what movements can a removable appliance cause?

Answer 4

tipping
space maintenance
bite opening
crossbite correction
single tooth movement

Question 5

what are the 4 components of the appliance?

Answer 5

baseplate
activator
retention
anchorage

Question 6

what materials are used in making an appliance?

Answer 6

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

Question 7

what is the job of the baseplate?

Answer 7

holds components together
active or passive
can hold biteplanes

Question 8

what is the job of an anterior biteplane?

Answer 8

reduce overbite

Question 9

what is the job of a posterior biteplane?

Answer 9

eliminates occlusal interferneces

Question 10

what is put in a baseplate to make it active?

Answer 10

springs

Question 11

what is the force of the appliance dependent on?

Answer 11

length of wire
radius of wire
stiffness of wire

Question 12

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

Answer 12

lighter force exerted

Question 13

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

Answer 13

add coils to wire

Question 14

double the diameter of the wire, force?

double the length?

Answer 14

increase forces

decrease forces

Question 15

tooth movement happens in what direction?

Answer 15

perpendicular to point of contact of spring with tooth

Question 16

if spring is 0.5mm, activation is?

if spring is 0.7mm, activation is?

Answer 16

3mm

1mm

Question 17

palatal springs can cause movement in what direction?

Answer 17

mesial
distal
buccal

Question 18

size of palatal springs?

Answer 18

0. 5mm

0. 7mm molars

Question 19

buccal canine retractors cause movement of canines in what direction?

Answer 19

palatally and distally

Question 20

what size are buccal canine retractors?

how are they activated?

Answer 20

0.7/0.5mm with supportive tubing

activated by winding coil or adjusting arm

Question 21

what size are Z springs?

Answer 21

0.5mm SS

Question 22

what are Zsprings?

Answer 22

double cantilever increasing wire length where space is limited

Question 23

where to Z springs sit?

Answer 23

perpendicular to palatal surface

Question 24

how are Z springs activated?

Answer 24

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

Question 25

what size are T springs?

Answer 25

0.5mm SS

Question 26

what are T springs used for?

Answer 26

move teeth buccally

Question 27

how are T springs activated?

Answer 27

pull spring away from baseplate at angle of 45 degrees

Question 28

are bows active or passive?

Answer 28

can be either

Question 29

what is the job of an active bow?

Answer 29

retraction of proclined incisors

Question 30

what are the sizes of bows?

Answer 30

07/0.8mm, 0.5mm if unsupported

Question 31

what is a roberts retractor used for?

Answer 31

0.5mm and used to retract incisors

Question 32

what direction to screws move teeth?

Answer 32

labiolingually

Question 33

where do screws get force to move teeth?

Answer 33

via acrylic contacting tooth and transversley expand

Question 34

how often are screws turned?

Answer 34

once a week at start of tx | twice a week further into tx

Question 35

what can screws be used for?

Answer 35

to move teeth required for retention

Question 36

how do adams clasps and cribs clasps give retention?

Answer 36

engage undercuts at mesio distal

Question 37

what size are adams and cribs clasps?

Answer 37

0. 7mm SS molars | 0. 6mm premolars and deciduous teeth

Question 38

what are southend and c clasps used for?

Answer 38

anterior teeth

Question 39

what size are southend and c clasps? | how do they give retention?

Answer 39

undercut beneath contact point | 0.7mm SS

Question 40

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

Answer 40

0.7mm | soldered ball engage undercuts interproximally

Question 41

where to labial bows give retention? | how are they activated?

Answer 41

anterior retention | squeeze U loop to tighten

Question 42

what is anchorage?

Answer 42

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

Question 43

how is anchorage increased?

Answer 43

clasping more teeth | using lighter forces

Question 44

what tools are used to fit appliances?

Answer 44

``` adams clasps spring forming pliers marker measuring device acrylic trimmer ```

Question 45

when can removable appliances be taken out?

Answer 45

contact sports | cleaning

Question 46

what problems can happen with these appliances?

Answer 46

breakages loose fitting, falls out palatal inflammation excessive tilting