Ortho appliaces

Question 1

What is First order bends?

Answer 1

Controls horizontal. Faciolingual bends in wire to compensate for differences in faciolingual widths of individual teeth.

Question 2

What is Second order bends?

Answer 2

MD tip. Bends inciso-gingival placed that dictates MD angulation of teeth and their roots.

Question 3

What is Third order bends?

Answer 3

Inclination Torque. Bends that dictate faciolingual position of roots.

Question 4

When diameter of wire is doubled, what happens to strength, springiness/stiffness, and range?

Answer 4

Strength= increases 2 to the 3rd power
Springiness/Stiffness=  stiffness Increases 2 to the 4th power
Range= Decreases by half. 

Stiffness/springiness is what changes the most.

Question 5

Stainless steel has a high what?

Answer 5

Highest modulus of elasticity (very stiff).

Question 6

What increases strength in Elgiloy/RMO?

Answer 6

Heat treatments.

Question 7

What is the desired quality of NiTi wires? When is it used?

Answer 7

• Hysteresis

- Used for initial treatment

Question 8

What is the desired quality of TMA? USed for?

Answer 8

• Formability

- Used for finishing treatment.

Question 9

Angulation relates to what? All permanant teeth have what angulation?

Answer 9

• MD tip.

- All have positive angulation.

Question 10

What is inclination? What teeth are positive and negative?

Answer 10

• Buccolingual inclination

- All teeth are negative, except max incisors.

Question 11

What is edge-wise appliance?

Answer 11

Rectangular wire place into rectangular bracket with its longest dimension being horizontal.