Lab Session 2

Question 1

What is the aim

Answer 1

description of what the appliance design is aiming to achieve

Question 2

What is ARAB

Answer 2

active component
retention
anchorage
baseplate

Question 3

What is the active component

Answer 3

the name of the component or components that will be moving teeth with the application of force

Question 4

What is retention

Answer 4

resistance to displacement forces

Question 5

What is anchorage

Answer 5

resistant to unwanted tooth movement

Question 6

What is the function of the baseplate

Answer 6

connects all components together as a unit, provides anchorage and assists with retention

Question 7

How does tooth movement occur in orthodontics

Answer 7

The force exerted creates pressure, this causes bone around the tooth to remodel
the remodeling of bone is controlled by the PDL fibres

Question 8

What is the composition of stainless steel

Answer 8

72% iron
18% chromium
8% nickel
1.7%titanium
0.3% carbon

Question 9

What are advantages of removable orthodontics

Answer 9

tipping of teeth
excellent anchorage 
generally cheaper than fixed
shorter chair side time 
OH is easier to maintain
non destructive to tooth
less specialized training required
can be easily adapted for overbite reduction 
can achieve block movements

Question 10

What are the disadvantages of removable orthodontics

Answer 10

less precise control of tooth movement
can be easily removed by px
generally can move 1-2 teeth at a time
specialist technical staff required to construct appliances 
rotations very difficult to correct

Question 11

What would be the active component for retracting canines

Answer 11

palatal finger springs + guards on the CANINES

Question 12

How thick is the stainless steel for palatal finger springs and guards

Answer 12

0.5mm HSSW

Question 13

For an active component that is retracting canines, what retention would you use

Answer 13

adams clasps on the 6s

southend clasps on centrals

Question 14

What is the stainless steel measurement for adams and southend clasps

Answer 14

0.7mm HSSW

Question 15

What is the baseplate made out of

Answer 15

self cure PMMA

Question 16

When we have anterior crowding, we want to relieve space, how can we do that

Answer 16

we can remove the teeth
widen the arch
thin teeth

Question 17

What are the 5 main intra oral displacement forces that

Answer 17

tongue
gravity
chewing
talking
active component

Question 18

Why do we not need to survey for clasps

Answer 18

flexibility of stainless steel

Question 19

What law is anchorage based on

Answer 19

Newton 3rd law - for every action there is an opposite and equal reaction