Chapter 10 Materials for fixed indirect restoration

Question 1

1.

What is indirect fixed Restoration?

Answer 1

• constructed **outside **of the mouth
• Not meant to be removed
• Restores part of a tooth

Question 2

How are indirect fixed resotrations classified?

Answer 2

• By the amount of tooth restored and material used to restore the tooth

Question 3

What are some types of IFR?

indirect fixed restorations?

Answer 3

Bridge
Veneers
Inlay
Onlay
Crown

Question 4

What are inlays?

Answer 4

• intracoronal (INSIDE the crown)
• Class I- pits fissure and grooves
• Class II- proximal surfaces posterior
• DONOT restore Cusps
• used luting cement and bonding resins

Question 5

What are onlays?

Answer 5

• Restores one or more CUSPS
• (ON a cusp)
• Protects from occlusal forces

Question 6

What is a veneer?

Answer 6

• Thin layer of material
• placed facially
• direct or indirect
• supported by underlying tooth structures

Question 7

When are crowns needed?

Answer 7

• When there is significant tooth loss structure or fractures

Question 8

What is a cantilever bridge ?

Answer 8

When a pontic only supported on one side

Question 9

What are the indirect restorative materials ?

Answer 9

• metals
• ceramics
• ceramometals
• composites

Question 10

What are the indirect restortative METALS?

Answer 10

• Noble metals: Gold, palladium, plantium and silver

Question 11

High Noble is?

Answer 11

Greater than or equal to 60 %
Gold= 40% or more

Question 12

Noble?

Answer 12

Noble greater or = to 25% with or without gold

Question 13

Base metals

Answer 13

noble: less than 25%

Question 14

What are the requirements for dental alloys?

Answer 14

• biocompatible
• Adequate physical and mechanical properties
• Corrosion resistant
• relative ease of favrication by trained dental personnel
• inexpensive

Question 15

What are the steps for casting dental alloys?

Answer 15

• create wax pattern
• attach sprue
• invest the wax pattern
• burn out wax pattern
• cast the metal
• cool and retrieve
• finish and polish

Question 16

what are indirect restorative ceramics?

Answer 16

• feldspathic
• leucite-reinforced
• lithium disilicate
• polycrystalline- zirconia
• hybrid resin ceramic
• porecelain fused metal- PFM

Question 17

What is feldspathic?

Answer 17

• mixture of silica, feldspar, alumina
• highly esthetic
• more prone to fractures
• veeners

Question 18

What is leucite-reinforced?

Answer 18

• added high amount of leucite crystals to feldspathic porcelain for strength
• veneers

Question 19

What is lithium disilicate ceramic?

Answer 19

• composed of lithium disilicate crystals and glass matrix
• strong and suitable for veneers, crowns and bridges

Question 20

What is zirconia?

Answer 20

• zirconium dioxide
• extremely strong
• opaque
• less wear on enamle
• difficult to bond
• crowns, bridges

Question 21

What are hybrid resins?

Answer 21

• blend of ceramic and resin
• combines benfits of ceramics and flexibility of resin
• easier to adjust and polish
• uncertain clinical longevity

Question 22

What are porcelain fused to metal?

Answer 22

• Metal substructure with porcelain overlay
• Can show darkline at gingva
• Wised for many years
• Crowns and bridges