Anchorage Flashcards
Define Anchorage
The resistance to unwanted tooth movement
Newton’s 3rd Law
For every action there is an equal and opposite reaction
List the types of anchorage
Simple
Compound
Reciprocal
Stationary
Differential
Define Simple Anchorage
1 tooth against another
Define Compound Anchorage
More than 1 tooth in the anchor unit
Define reciprocal anchorage
Equal forces applied to equivalent teeth which equal movement towards or away from them
Define differential anchorage
Similar to stationary - tipping first and then uprighting
Define stationary anchorage
Strongest type of anchorage
Eg. TADS or ankylosed teeth
Tipping
What is EOA
Headgear:
Increases anchorage by preventing mesial movement and by maxillary restraint
What is the force and duration of EOA
10-12 hours
200-250g
What is used for the TPA arch?
0.9 SS Wire
What adhesives is used to cement a TPA?
GIC
Bandlock
Poly F
Zinc phosphate
Describe the components of a TPA
Molar bands
Arch that covers over the palate
How does a TPA work?
• Stops mesial movement of the first molars
- m/b root hots the cortical bone
• maintains intermolar width
What is a Nance button?
Acrylic button combined with a TPA. Uses the palatal vault for anchorage
