Chapter 10 Materials for fixed indirect restoration Flashcards
1
Q
1.
What is indirect fixed Restoration?
A
- constructed **outside **of the mouth
- Not meant to be removed
- Restores part of a tooth
2
Q
How are indirect fixed resotrations classified?
A
- By the amount of tooth restored and material used to restore the tooth
3
Q
What are some types of IFR?
indirect fixed restorations?
A
Bridge
Veneers
Inlay
Onlay
Crown
4
Q
What are inlays?
A
- intracoronal (INSIDE the crown)
- Class I- pits fissure and grooves
- Class II- proximal surfaces posterior
- DONOT restore Cusps
- used luting cement and bonding resins
5
Q
What are onlays?
A
- Restores one or more CUSPS
- (ON a cusp)
- Protects from occlusal forces
6
Q
What is a veneer?
A
- Thin layer of material
- placed facially
- direct or indirect
- supported by underlying tooth structures
7
Q
When are crowns needed?
A
- When there is significant tooth loss structure or fractures
8
Q
What is a cantilever bridge ?
A
When a pontic only supported on one side
9
Q
What are the indirect restorative materials ?
A
- metals
- ceramics
- ceramometals
- composites
10
Q
What are the indirect restortative METALS?
A
- Noble metals: Gold, palladium, plantium and silver
11
Q
High Noble is?
A
Greater than or equal to 60 %
Gold= 40% or more
12
Q
Noble?
A
Noble greater or = to 25% with or without gold
13
Q
Base metals
A
noble: less than 25%
14
Q
What are the requirements for dental alloys?
A
- biocompatible
- Adequate physical and mechanical properties
- Corrosion resistant
- relative ease of favrication by trained dental personnel
- inexpensive
15
Q
What are the steps for casting dental alloys?
A
- create wax pattern
- attach sprue
- invest the wax pattern
- burn out wax pattern
- cast the metal
- cool and retrieve
- finish and polish
