removable appliances

Question 1

what are some advantages of removable appliances?

Answer 1

• easy to clean
• good anchorage
• can move blocks of teeth
• cheap
• less chairside time than fixed appliances
• easy to adjust
• less inventory

Question 2

what are some disadvantages of removable appliances?

Answer 2

• dependant on pt co-operation
• tipping movements only
• speech may be affected
• technician assistance
• retention can be difficult
• lower RA is difficult to wear

Question 3

what tooth movements does a removable appliance cause?

Answer 3

-tipping
=space maintenance
-bite opening
-crossbite correction
-single tooth movement

Question 4

what are the 4 components of a removable appliance?

Answer 4

-BARA
-Bite block
-activation
retention
-anchorage

Question 5

what is the purpose of the base plate in a removable appliance?

Answer 5

the baseplate holds the components together

Question 6

the force from an active spring in a removable appliance is dependant on what?

Answer 6

1) length of the wire

2) elastic modulus

Question 7

what type of movment do palatal springs cause?

Answer 7

mesio-distal and buccal movement

Question 8

what does a ‘Z’ spring do?

Answer 8

increases wirre length where space is limited. (proclines one tooth)

Question 9

what is a ‘T’ spring used for?

Answer 9

T spring is used to move teeth buccally

Question 10

bows may be what?

Answer 10

active or passive

Question 11

what do crews do in a removable appliance?

Answer 11

move teeth labio-lingually

Question 12

what are 3 components to form retention in a removable appliance?

Answer 12

1) triangle
2) adams clasp
3) cribs

Question 13

what is meant by anchorage?

Answer 13

the resistance to unwanted tooth movements

Question 14

when would you first want to review a removable appliance after initial fitting?

Answer 14

2-3 weeks after

Question 15

expect how many mm of movement/month in a removable appliance?

Answer 15

1mm movement/month