Casting Alloys Flashcards
1
Q
Features of dental alloys?
A
Rarely used in pure form (apart from titanium)
Although alloys of titanium mostly used
2
Q
Dental casting alloy types?
A
Gold alloys Precious metal alloys Nickel chromium alloys Cobalt chromium alloys Titanium alloys
3
Q
Desirable properties of alloys?
A
Biocompatibility Corrosion and tarnish resistant Optimum mechanical properties Bond to ceramic (for metal ceramic) Aesthetic Cheap
4
Q
RPD alloys?
A
Most common - Co-Cr
Historically Au
Ti alloy available
SLM production is rapidly developing
5
Q
Features of CoCr?
A
Higher density Lower casting temp Lower casting shrinkage Medium tensile strength High hardness Low ductility
6
Q
Alloys for metal restorations?
A
Type I-IV Au Precious metals CoCr NiCr Ti
7
Q
Indication for type I gold alloy?
A
Inlay
8
Q
Indication for type II gold alloy?
A
Onlay
9
Q
Indication for type III gold alloy?
A
Crowns
10
Q
Indication for type IV gold alloy?
A
Crown, bridge, post and core, RPD
11
Q
Examples of non-precious metals?
A
Ni-Cr
Co-Cr
Ti
Ti-AI-V
12
Q
Bonding alloys features?
A
Melting temp
TEC
Oxide layer
Modulus of elasticity
13
Q
Types of alloys?
A
Au alloys
Ni Cr
Co Cr
Ti alloys
