lab

Question 1

What is a trans palatal arch?

Answer 1

0.9mm HSSW
Most commonly attached to FPM with ortho SS bands
Appliance attached to bands through welding/soldering

Question 2

What are the uses of transpalatal arches?

Answer 2

Anchorage
Rotations
Limited widening or contraction

Question 3

What is a palatal arch with a Nance button and why is it used?

Answer 3

0.9mm HSSW
Most commonly attached to FPM with ortho bands
Used for anchorage

Question 4

What is a quad helix?

Answer 4

0.9mm HSSW
Most commonly attached to FPM with SS ortho bands

Question 5

What are the uses of a quadhelix?

Answer 5

Bilateral expansion
Asymmetrical expansion
Fan style expansion
Rotation of molars
Expansion in cleft palate
Modified to proclined incisors
Assist in habit breaking

Question 6

What are the advantages of fixed ortho?

Answer 6

Bodily tooth movement
Rotations easily fixed
Used easily in lower arch as well as upper
Individual force can be applied to every tooth
Not easily removed by pt
Works 24 hours/7 days a week
Precise 3D movement of teeth
Less invasive of tongue space
Minimal palatal coverage

Question 7

What are the disadvantages of fixed ortho?

Answer 7

Inc risk of root resorption
Decalcification
Can be perceived as visually unattractive
Can cause soft tissue trauma
Cost
High motivation needed for OH
Highly trained specialist needed
Etching teeth is destructive

Question 8

What are the advantages of removable ortho?

Answer 8

Tipping
Excellent anchorage
Generally cheaper than fixed
Shorter chairside time required
OH easier to maintain
Non-destructive to tooth surface
Less specialised training required to manage
Can be easily adapted for OB reduction
Can achieve block movements

Question 9

What are the disadvantages of removable ortho?

Answer 9

Less precise control of tooth movement
Can be easily removed by pt
Generally only 1-2 teeth can be moved at a time
Specialist technical staff required to construct appliances
Rotations very difficult to correct