Lab 5 Wires/Alloys Flashcards
The first wire introduced for orthodontic purposes.
Gold alloy wires
Ideal choice for good biocompatibility.
Gold alloy wires
Many gold alloys corresponds to ______ gold casting alloys.
Type IV
Subjected to softening and hardening heat treatments.
Gold alloy wires
4 alloys used in gold wires?
Gold
Copper
Silver
Nickel
_______ and ______ cause rise in melting point, improve corrosion resistance, increase strength and hardness.
Palladium, platinum
Binary alloys use only ______ and ________ as major metals used.
Gold, copper
Exhibit severe grain growth and poor ductility.
Binary alloys (gold&copper)
Properties of _______ wires:
- Yield strength
- Modulus elasticity
- Very formable and capable of delivering lower forces than stainless steel.
Gold wires
First known as Wipla-Like platinum.
Stainless steel alloy
Began to replace gold wires in 1930s.
Stainless steel alloy
Steels are ____-based alloys that usually contain _________ carbon.
iron-based; less than 1.2% carbon
When 12-30% chromium is added to steel, it is commonly called as?
Stainless steel
Properties of ______ alloy.
- Biocompatibility
- High corrosion resistance
- Chemically stable
- Superior mechanical properties
Stainless steel
Nickel Titanium Alloys were first called as?
Nitinol
Can exist in more than one form or crystal structure.
NiTi wires
Composition of NiTi wires?
- 55% Ni
- 45% Ti
- 1.6% Cobaly
Initially manufactured for watch springs by Elgiloy.
Cobalt-Chromium-Nickel Alloys
Properties of ______:
- Transition temperature range (TTR)
- Shape memory
- Super elasticity
NiTi wires
Demonstrates superior elasticity.
Japanese NiTi wires
- Introduced by Burstone.
- Has a springback.
- At 80 degrees activation, average stiffness is 73% of SS and 36% of NiTo.
Chinese NiTi alloy
Copper NiTi is a new quarternary alloy composing? (4)
Copper
Nickel
Titanium
Chromium
- Introduced by Ormoco Corp.
- Useful for different types of orthodontic patients.
Copper NiTi wires
