Exam 2B

Question 1

What headgear when you need to rotate maxilla and close anterior openbites?

Answer 1

high pull headgear

Question 2

What headgear when you need to restrict growth of maxilla?

Answer 2

cervical pull headgear

Question 3

What headgear when you need to encourage growth of maxilla?

Answer 3

protraction facemask

Question 4

Components of bracket?

Answer 4

orientation indicator
bracket base
tie wings
slot
see slide 41

Question 5

bracket dimensions

Answer 5

0. 018 x 0.025 - inch OR

0. 022 x 0.028 - inch

Question 6

if you use bracket dimension 0.018 x 0.025 - inch what does the first and second number mean

Answer 6

1st) widge occluso-gingivally

2nd) depth

Question 7

4 Properties of orthodontic arch wires?

Answer 7

High strength
Low stiffness
High working range
High formability

Question 8

Properties of Nickel-titanium (NiTi) wires

Answer 8

good for leveling and aligning (1st phase)
resistant to permanent deformation
shape memory and superelasticity
used when low forces and large deflections are needed
super-elastic NiTi are flexible at room temp and more rigid at higher temps

Question 9

Properties of Stainless Steel (SS) wires

Answer 9

good for closing spaces or tip/torque control
low friction = best for sliding mechanics
18-8
18% chromium, 8% nickel
corrosion resistant
highest modulus of elasticity
lowest springback/high strength/stiffness

Question 10

Name some distalizing appliances?

Answer 10

Pendulum (T-rex)
Temporary Anchorage Device (TAD)
Lip Bumper

Question 11

When you need to redirect remaining mandibular growth more horizontal?

Answer 11

Herbst Appliance