Lab 5 Wires/Alloys

Question 1

The first wire introduced for orthodontic purposes.

Answer 1

Gold alloy wires

Question 2

Ideal choice for good biocompatibility.

Answer 2

Gold alloy wires

Question 3

Many gold alloys corresponds to ______ gold casting alloys.

Answer 3

Type IV

Question 4

Subjected to softening and hardening heat treatments.

Answer 4

Gold alloy wires

Question 5

4 alloys used in gold wires?

Answer 5

Gold
Copper
Silver
Nickel

Question 6

_______ and ______ cause rise in melting point, improve corrosion resistance, increase strength and hardness.

Answer 6

Palladium, platinum

Question 7

Binary alloys use only ______ and ________ as major metals used.

Answer 7

Gold, copper

Question 8

Exhibit severe grain growth and poor ductility.

Answer 8

Binary alloys (gold&copper)

Question 9

Properties of _______ wires:
- Yield strength
- Modulus elasticity
- Very formable and capable of delivering lower forces than stainless steel.

Answer 9

Gold wires

Question 10

First known as Wipla-Like platinum.

Answer 10

Stainless steel alloy

Question 11

Began to replace gold wires in 1930s.

Answer 11

Stainless steel alloy

Question 12

Steels are ____-based alloys that usually contain _________ carbon.

Answer 12

iron-based; less than 1.2% carbon

Question 13

When 12-30% chromium is added to steel, it is commonly called as?

Answer 13

Stainless steel

Question 14

Properties of ______ alloy.
- Biocompatibility
- High corrosion resistance
- Chemically stable
- Superior mechanical properties

Answer 14

Stainless steel

Question 15

Nickel Titanium Alloys were first called as?

Answer 15

Nitinol

Question 16

Can exist in more than one form or crystal structure.

Answer 16

NiTi wires

Question 17

Composition of NiTi wires?

Answer 17

• 55% Ni
• 45% Ti
• 1.6% Cobaly

Question 18

Initially manufactured for watch springs by Elgiloy.

Answer 18

Cobalt-Chromium-Nickel Alloys

Question 19

Properties of ______:
- Transition temperature range (TTR)
- Shape memory
- Super elasticity

Answer 19

NiTi wires

Question 20

Demonstrates superior elasticity.

Answer 20

Japanese NiTi wires

Question 21

• Introduced by Burstone.
• Has a springback.
• At 80 degrees activation, average stiffness is 73% of SS and 36% of NiTo.

Answer 21

Chinese NiTi alloy

Question 22

Copper NiTi is a new quarternary alloy composing? (4)

Answer 22

Copper
Nickel
Titanium
Chromium

Question 23

• Introduced by Ormoco Corp.
• Useful for different types of orthodontic patients.

Answer 23

Copper NiTi wires