Ortho Materials

Question 1

force applied to the wire in order for it to be engaged into the bracket slot

Answer 1

activation/loading

Question 2

force applied to the tooth by the wire in order for the wire to return to its original shape

Answer 2

deactivation/unloading

Question 3

refers to the flexibility of the wire

Answer 3

loading

Question 4

refers to the amount of force that will be delivered to the tooth as the wire returns to its original shape

Answer 4

unloading

Question 5

the point where any amount of stress beyond it will not have the wire return to its original shape, ideally stress in ortho wires should be kept below this limit

Answer 5

proportional limit

Question 6

wires from least stiff/strong to most stiff/strong

Answer 6

NiTi < TMA < SS
rectangular > round
beam > cantilever

Question 7

type of brackets used today

Answer 7

pre-adjusted edgewise brackets (each bracket has its own design for different teeth)

Question 8

metal vs ceramic brackets

Answer 8

Metal- unesthetic, SS material, wire held in place by elastic ring or stainless steel tie placed over bracket slot

Ceramic- esthetic, similar color to tooth, more friction (harder for wire to slide through bracket), more prone to fracture