OSCE CRAM > DMS > Flashcards

DMS Flashcards

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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
List the different types of GI
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
25
List the constituents of GI
Acid - Polyacrylic acid - Tartaric acid Base - Silica - Alumina - Calcium F/Aluminium F
26
Describe the acid base reaction of GI
Glass + acid --> salt + silica gel
27
What are the 3 phases of the GI reaction
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
List advantages of GI (4)
- Adheres well to enamel/dentine - Thermal expansion similar to enamel/dentine - F release - Can be light cured
29
List disadvantages of GI (3)
- Technique sensitive - Brittle - Poor aesthetics
30
What is RMGI
GI with resin composite properties, set with a curing light
31
Name the constituents of RMGI
POWDER - Barium glass - Polyacrylic acid - Ascorbic acid - Pigments LIQUID - HEMA - Polyacrylic acid - Tartaric acid - Water
32
Advantages of RMGI (6)
- F release - Light cured - Stronger than conventional - Lower solubility due to resin - Can be polished immediately unlike conventional - More aesthetic than conventional
33
Disadvantages of RMGI (3)
- Polymerisation contraction - Swelling due to uptake of water HEMA extremely hydrophilic - Monomer leaching HEMA toxic to pulp
34
Describe the process of acid etchant (4)
- 37% phosphoric acid - Creates defects in enamel increases surface roughness - Removes smear layer - Leave on for 20s
35
Function of a dentine primer
Wets dentines and penetrates the dentinal tubules
36
Function of a bonding agent
Aids the retention between material and tooth and fills the space, reducing chance of micro leakage
37
When is a liner used and why?
Placed over exposed dentine - Seal dentine - Pulpal protection - Thermal insulation - Stimulation of tertiary dentine
38
Function of CaOH
Stimulates formation of tertiary dentine Used in direct/indirect pulp capping Catalyst + base system
39
Properties of CaOH
- Low thermal conductivity - Formation of tertiary dentine - pH 11-12
40
Setting time for CaOH
1.5-2.5mins
41
Name some examples of liners (4)
CaOH ZOE Zinc phosphate GI
42
What is temp bond?
ZOE Cement with sedative effect on pulp Acid base reaction
43
Name examples of resin cements to cement indirects
Relyx unicem Panavia Nexus
44
Indications for AQUACEM
MCC Metal post Zirconia crown Gold crown All metal crown
45
Initial + full set for AQUACEM
Initial: 5 mins Full: 24hrs
46
Mixing ratio for AQUACEM
1 powder: 2 drops water
47
AQUACEM advantages
F release High strength Low solubility Chemically bonds to tooth
48
AQUACEM disadvantages
Low durability Low strength Limited shade range
49
PANAVIA indication
RRB
50
Type of cement PANAVIA is?
Anaerobic cure composite
51
Advantages of PANAVIA
Most aesthetic, strong Better adhesion to enamel + dentine
52
Method of use of PANAVIA
Sandblast Etch 30s then 60s P+B Add to metal wing + cure Place OXYGUARD II at margins for 3 mins then wash off
53
NEXUS indications
Veneers Fibre posts Composte/porcelain inlays
54
Type of cement NEXUS is
Dual cure composite
55
Advantages of NEXUS
Aesthetics Low solubility High bond strength
56
Method of use for NEXUS
Porcelain etched with HF Prepped w silane coupling agent Etch + bond tooth
57
Describe bonding of NEXUS
- 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
What is RELYX Adhesive UNICEM?
Self adhesive universal cement
59
Indications for RELYX UNICEM
MCC All ceramic crowns Bridges Inlays/onlays
60
Name the different types of crowns
1. MCC 2. All ceramic 3. All metal 4. Gold
61
List advantages + disadvantages of MCC
ADV - Durable - Strong - Less destructive than ceramic prep - Less abrasive DISADV - Metal shine through recession
62
List advantages + disadvantages of all ceramic crowns
ADV - Aesthetic DISADV - More expensive - Zirconia abrasive avoid in bruxists - Most destructive prep
63
Compare strength of Lithium Disilicate and Zirconia crowns
Lithium Disilicate < Zirconia
64
List advantages + disadvantages of all metal crowns
ADV - Strong - Less abrasive - Less prep DISADV - Aesthetics
65
List advantages + disadvantages of gold crowns
ADV - Strong - Less abrasive DISADV - Aesthetics
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