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Bio Materials > Chapter 9 > Flashcards

Chapter 9 Flashcards

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Biology 101 flashcards
1
Q

Ceramics are used for

A

Crowns
Fixed bridges
Inlays- occlusal surface
Onlays- 2 or more cusps
veneers

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2
Q

Type of material depends on

A

the part of the mouth
Stresses
Extent of damage
Esthetic requirement of the patient

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3
Q

The general term ceramics

A

describe porcelain and a variety if materials similar in appearance, but vary in composition, mode of fabrication, and physical and mechanical properties

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4
Q

Two categories of ceramics

A
  1. Glass based
    • silica as main component
    • More esthetic than the non-glass based
    • ex. Feldspathic, leucite-reinforces, and lithium disilicate
  2. Non-glass based
    -Crystalline in nature
    - Strongest but dull
    • ex. Alumina and zirconia
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5
Q

Advantage of all-ceramic restorations

A

Esthetics, there is no metal substructure to hide

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6
Q

Porcelain

A

describes a glass-like tooth-colored dental material
- Used more on anteriors, very esthetic
- Porcelain veneers and low stress areas
becomes more fracture resistant ones bonded to a surface

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7
Q

Alumina porcelain

A

double the fracture resistance

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8
Q

Zirconia

A

-STRONGEST
opaque and lacks the vitality of natural tooth structure, so it is not very esthetic, but it is very strong

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9
Q

Lithium disilicate

A

Stronger ceramic
- Used in anterior and posterior
- very esthetic, because of high translucency
- popular for veneers and crowns

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10
Q

Flexural strength is important because

A

cermaics and stiff and brittle

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11
Q

Ceramics act as _____

A

Insulators, they don’t conduct heat readily

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12
Q

_____ are the most opaque

A

non-glass

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13
Q

Biocompatibility

A

Ceramics are the most biocompatible restorative material

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14
Q

Processing Techniques types

A

4 types
1. Sintering
- Occurs earn porcelain particles are melted and fused to metal
2. Slip-casting
3. Heat pressing
4. Computer-aided machining

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15
Q

Benefits of CAD/CAM

A

No cord packing or impression material needed
No die needs to be poured and no temporary crown is necessary

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16
Q

Lithium dislocate and zirconium are much ___ than porcelain

A

Stronger

17
Q

ceramics are strong enough to be used in the posterior, besides on

A

bruxers

18
Q

Leucite-reinforced ceramics ( empress)

A

estetic
Work well for inlays, onlays, thicker veneers

not strong enough for posterior crowns

19
Q

Lithium disilicate EMAX

A

2x strength as Empress
enough translucency for anterior
used for any restoration

20
Q

Problem with alumina and zirconia

A

Strong but opaque so not esteem for anterior teeth

Alumina- good for inlays/onlways hods the discoloration form RCT

Zirconia- alternative to PFM crowns

21
Q

Veneers

A

Thin layer of ceramic or composite resin material that is bonded to the fronts of teeth to improve their appearance.

  • most common used materials are direct composites or indirect ceramics
22
Q

Best material for veneers

A

Ceramic
- more durable, surface doesn’t discolor, more wear resistant and stronger

23
Q

When the natural tooth structure is___ it makes to challenging to place veneers

A

Dark

24
Q

Tooth is etched with ___ acid prior to cementing veneers

A

hydrofluoric

25
Q

enhances bonding and forms a chemical union

A

saline

26
Q

Porcelain metal restorations

A

the main advantage is the strength and durability produced by the bond between the metal core and the esthetics of the porcelain covering

27
Q

Preparing the restoration

A

If lab hasn’t already, etch the restoration for 5 min

then apply silane coupling agent for 60 sec, then air dry

28
Q

Hue

A

Basic color of the object

29
Q

Chroma

A

The intensity of the color

  • more chroma= intense Color
30
Q

Value

A
  • The brightness of the color
  • More value is lighter
31
Q

Shade taking

A
  • patient should be involves
  • take shade before preparation and before a rubber dam
  • teeth should be clean, free of stain, and moist
32
Q

Shade tab

A

-wet the tab and tooth
-held adjacent
- in the same plane not infront or behind

Bio Materials (5 decks)

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