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OSCE CRAM > DMS > Flashcards

DMS Flashcards

1
Q

Name examples of ZO based cements

A

Coltosol
Cavit

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1
Q

Name examples of ZOE based cements

A

Kalzinol
IRM

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2
Q

Name advantages of CAVIT/COLTOSOL ZO cements (3)

A

Radiopaque
Packable
Self cure

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3
Q

Name a disadvantage of CAVIT/COLTOSOL cements

A

Not suitable for shallow rests need 3-5mm thickness

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4
Q

List uses of IRM/KALZINOL ZOE cements

A

Base
Temp resto
Temp luting cement
Endo sealer

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5
Q

Name advantages of IRM/KALZINOL ZOE

A
  • Antimicrobial (soothing effect on pulp)
  • Good sealing ability
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6
Q

Name disadvantages of IRM/KALZINOL ZOE (2)

A
  • Does not adhere to enamel or dentine
  • Not to be used in conjunction w composite as Eugenol affects setting
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7
Q

Setting time of ZOE cements

A

7-9mins

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8
Q

Constituents of amalgam

A

Silver
Tin
Copper
Mercury
(sometimes Zinc)

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9
Q

What is amalgam classified by?

A

Particle shape and composition

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10
Q

List the 2 types of particle shape

A

Lathe cut
Spherical

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11
Q

Preferred particle shape of Amalgam (4)

A

Spherical
- Less mercury to bind materials
- Tighter packed particles
- Increased strength
- Fluid mix easier to condense

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12
Q

What are the 2 types of amalgam particle composition?

A

Conventional
High copper non Y2

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13
Q

Difference between conventional + high copper non y2

A

Y2 phase eliminated by adding copper

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14
Q

Advantage of high copper non y2 over conventional

A

Superior in:
- Corrosion resistance
- Creep
- Strength
- Durability
- Marginal integrity

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15
Q

How long does amalgam take to set?

A

24hrs

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16
Q

Advantages of Amalgam (4)

A
  • Cost
  • High compressive strength
  • Easy to manipulate
  • Less moisture control
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17
Q

Disadvantages of Amalgam (9)

A
  • Sensitive to mixing technique
  • Aesthetics
  • No bond to tooth (micro leakage)
  • Larger retentive prep required
  • High thermal conductivity (may need liner in deeper cavities)
  • Mercury toxicity
  • Lichenoid reactions/metal allergies
  • Creep (repeated stress below elastic limit)
  • Corrosion
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18
Q

What are the constituents of composite (4)

A
  1. Resin
    - Bis GMA
  2. Filler
    - Glass
  3. Photo-initiator
    - Camphorquinone allows hardening
  4. Silane coupling agents
    - Bifunctional molecule that bond resin to silica
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19
Q

Advantages of composite (4)

A
  • Aesthetic
  • Micromechanically bonds to tooth
  • Conservative
  • Low thermal conductivity (avoids plural damage from hot/cold)
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20
Q

Disadvantages of composite (5)

A
  • Not condensable/packable
  • Technique sensitive
  • Requires moisture control
  • Staining
  • High thermal expansion (should be equal to tooth to reduce micro leakage)
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21
Q

Name brand names of GI (3)

A

FUJI
Chemfill
RIVA

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22
Q

Name functions of GI (3)

A
  • Restorative material
  • Liner
  • Luting agent
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23
Q

What does the particle size of GI dictate?

A

Particle size dictates its usage

Luting + liner materials have smaller particle size

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24
Q

List the different types of GI

A

Type I
- Luting cements for crown/bridge
AQUACEM

Type II
- Class III and V restorations

Type III
- Liner/base
VITREBOND

Type IV
- Core build up

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25
Q

List the constituents of GI

A

Acid
- Polyacrylic acid
- Tartaric acid

Base
- Silica
- Alumina
- Calcium F/Aluminium F

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26
Q

Describe the acid base reaction of GI

A

Glass + acid –> salt + silica gel

27
Q

What are the 3 phases of the GI reaction

A
  1. Dissolution
    - Acid reacts with glass
    - H ions diffuse into glass
  2. Gelation
    - Ca ions form crosslinks
    - Initial set
  3. Hardening
    - Aluminium forms trivalent bonds
    - Takes about 7 days to set
28
Q

List advantages of GI (4)

A
  • Adheres well to enamel/dentine
  • Thermal expansion similar to enamel/dentine
  • F release
  • Can be light cured
29
Q

List disadvantages of GI (3)

A
  • Technique sensitive
  • Brittle
  • Poor aesthetics
30
Q

What is RMGI

A

GI with resin composite properties, set with a curing light

31
Q

Name the constituents of RMGI

A

POWDER
- Barium glass
- Polyacrylic acid
- Ascorbic acid
- Pigments

LIQUID
- HEMA
- Polyacrylic acid
- Tartaric acid
- Water

32
Q

Advantages of RMGI (6)

A
  • F release
  • Light cured
  • Stronger than conventional
  • Lower solubility due to resin
  • Can be polished immediately unlike conventional
  • More aesthetic than conventional
33
Q

Disadvantages of RMGI (3)

A
  • Polymerisation contraction
  • Swelling due to uptake of water
    HEMA extremely hydrophilic
  • Monomer leaching HEMA toxic to pulp
34
Q

Describe the process of acid etchant (4)

A
  • 37% phosphoric acid
  • Creates defects in enamel increases surface roughness
  • Removes smear layer
  • Leave on for 20s
35
Q

Function of a dentine primer

A

Wets dentines and penetrates the dentinal tubules

36
Q

Function of a bonding agent

A

Aids the retention between material and tooth and fills the space, reducing chance of micro leakage

37
Q

When is a liner used and why?

A

Placed over exposed dentine

  • Seal dentine
  • Pulpal protection
  • Thermal insulation
  • Stimulation of tertiary dentine
38
Q

Function of CaOH

A

Stimulates formation of tertiary dentine
Used in direct/indirect pulp capping
Catalyst + base system

39
Q

Properties of CaOH

A
  • Low thermal conductivity
  • Formation of tertiary dentine
  • pH 11-12
40
Q

Setting time for CaOH

A

1.5-2.5mins

41
Q

Name some examples of liners (4)

A

CaOH
ZOE
Zinc phosphate
GI

42
Q

What is temp bond?

A

ZOE
Cement with sedative effect on pulp
Acid base reaction

43
Q

Name examples of resin cements to cement indirects

A

Relyx unicem
Panavia
Nexus

44
Q

Indications for AQUACEM

A

MCC
Metal post
Zirconia crown
Gold crown
All metal crown

45
Q

Initial + full set for AQUACEM

A

Initial: 5 mins
Full: 24hrs

46
Q

Mixing ratio for AQUACEM

A

1 powder: 2 drops water

47
Q

AQUACEM advantages

A

F release
High strength
Low solubility
Chemically bonds to tooth

48
Q

AQUACEM disadvantages

A

Low durability
Low strength
Limited shade range

49
Q

PANAVIA indication

50
Q

Type of cement PANAVIA is?

A

Anaerobic cure composite

51
Q

Advantages of PANAVIA

A

Most aesthetic, strong
Better adhesion to enamel + dentine

52
Q

Method of use of PANAVIA

A

Sandblast
Etch 30s then 60s
P+B
Add to metal wing + cure
Place OXYGUARD II at margins for 3 mins then wash off

53
Q

NEXUS indications

A

Veneers
Fibre posts
Composte/porcelain inlays

54
Q

Type of cement NEXUS is

A

Dual cure composite

55
Q

Advantages of NEXUS

A

Aesthetics
Low solubility
High bond strength

56
Q

Method of use for NEXUS

A

Porcelain etched with HF
Prepped w silane coupling agent
Etch + bond tooth

57
Q

Describe bonding of NEXUS

A
  • Porcelain etched with HF acid
  • This allows micro mechanical retention
  • Silane coupling agent applied to porcelain
  • Bifunctional molecule that increases surface energy of porcelain to allow resin bonding
  • One end binds to roughened porcelain surface
  • One end binds to composite resin cement
58
Q

What is RELYX Adhesive UNICEM?

A

Self adhesive universal cement

59
Q

Indications for RELYX UNICEM

A

MCC
All ceramic crowns
Bridges
Inlays/onlays

60
Q

Name the different types of crowns

A
  1. MCC
  2. All ceramic
  3. All metal
  4. Gold
61
Q

List advantages + disadvantages of MCC

A

ADV
- Durable
- Strong
- Less destructive than ceramic prep
- Less abrasive

DISADV
- Metal shine through recession

62
Q

List advantages + disadvantages of all ceramic crowns

A

ADV
- Aesthetic

DISADV
- More expensive
- Zirconia abrasive avoid in bruxists
- Most destructive prep

63
Q

Compare strength of Lithium Disilicate and Zirconia crowns

A

Lithium Disilicate < Zirconia

64
Q

List advantages + disadvantages of all metal crowns

A

ADV
- Strong
- Less abrasive
- Less prep

DISADV
- Aesthetics

65
Q

List advantages + disadvantages of gold crowns

A

ADV
- Strong
- Less abrasive

DISADV
- Aesthetics

OSCE CRAM (40 decks)

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