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BDS3 OSCE > DMS summary - liners & bases > Flashcards

DMS summary - liners & bases Flashcards

1
Q

What is a liner

A

applied in a thin layer over exposed dentine

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2
Q

What are the functions of a liner

A
  • Dentine sealing
  • Pulpal protection
  • Thermal insulation
  • Stimulation of formation of tertiary dentine
  • Can also help to reduce pulpal inflammation
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3
Q

What is a base

A

applied in a thick layer on the floor of a cavity

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4
Q

What are the functions of a base

A
  • Protect pulp by providing thermal insulation & absorbing occlusal forces
  • Line out undercuts for indirect restorations
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5
Q

What type of calcium hydroxide is used for liners

A

setting calcium hydroxide

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6
Q

How does calcium hydroxide come to you?

A

as a base and catalyst

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7
Q

What are the constituents of the base in calcium hydroxide liner

A
  • CaOH
  • zinc oxide (filler)
  • zinc stearate (filler)
  • platicizer
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8
Q

What are the constituents of the catalyst in setting calcium hydroxide liner

A
  • Butylene glycol disalicylate - reactive element
  • Filler
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9
Q

What is the setting reaction for calcium hydroxide liner

A
  • Chelation reaction
  • Happens between ZnO & butylene glycol disalicylate
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10
Q

What are useful properties of calcium hydroxide liner

A
  • Stimulates production of tertiary dentine
  • Bactericidal (due to high pH)
  • Low thermal conductivity
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11
Q

What are not so useful properties of CaOH liner

A
  • Highly soluble - if there is any leakage it will disappear but also dentine is moist so :/
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12
Q

What are uses of CaOh liner

A
  • Liner
  • direct/indirect pulp capping
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13
Q

What is the brand name of CaOh liner

A

dycal

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14
Q

How does zinc phosphate cement come to you

A
  • powder and liquid
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15
Q

What is in the zinc phosphate cement powder

A
  • Zinc oxide - reactive ingredient
  • Magnesium oxide - gives strength and colour
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16
Q

What is in the liquid of zinc phosphate cement

A
  • phosphoric acid (about 50%)
  • aluminium and zinc oxide - buffer the solution
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17
Q

What is the setting reaction for zinc phosphate cement

A
  • Initially acid base reaction
  • Followed by a hydration reaction
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18
Q

What is an important thing to note on the setting reaction of zinc phosphate cement

A

its exothermic

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19
Q

What are useful properties of zinc phosphate cement

A
  • Solubility is ok (not amazing though)
  • Low thermal conductivity
  • Quick setting
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20
Q

What are not so useful properties of zinc phosphate cement

A
  • ts quite acidic when its just been mixed (reduces as it sets) but can cause a bit of pulp irritation
  • Shrinkage during setting
  • Exothermic reaction
  • Brittle
  • Not adhesive to tooth
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21
Q

What are uses of zinc phosphate cement

A
  • A base
  • Luting cement
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22
Q

What is the brand name of zinc phosphate cement

A

detrey zinc

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23
Q

What should you be cautious of when you are using zinc phosphate cement

A

how close you are to the pulp

it starts off acidic + an exothermic reaction so dont want to hurt pulp

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24
Q

What is the difference between zinc phosphate cement and zinc polycarboxylate cement

A
  • Similar to zinc phosphate but phosphoric acid is replaced by polyacrylic acid allowing it to bond to tooth similarly to GI
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25
Q

What are useful properties of zinc polycarboxylate cement

A
  • Bonds to enamel, dentine and alloys (except untreated gold restorations)
  • Less irritating to the pulp than zinc phosphate
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26
Q

Why is zinc polycarboxylate cement less irritating to the pulp than zinc phosphate

A
  • Its ph returns to neutral quicker
  • It has longer chain acids which do not penetrate dentine as easily
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27
Q

What are not so useful properties of zinc polycarboxylate cement

A
  • Lower compressive strength than zinc phosphate
  • Has a lower modulus (we want a modulus similar to dentine)
28
Q

What are the uses of zinc polycarboxylate cement

A
  • Base
  • Luting cement
29
Q

What is the brand name of zinc polycarboxylate cement

A
  • Poly-F Plus (dentsply manufacturer)
30
Q

How does zinc oxide eugenol come to you

A

powder and liquid

31
Q

What are the constituents of zinc oxide eugenol powder

A
  • Zinc oxide - reactive ingredient
  • White resin
  • Zinc stearate
  • Zinc acetate
32
Q

What are the constituents of zinc oxide eugenol liquid

A
  • Eugenol - active ingredient
  • Water & oils
33
Q

What are modifications on ZOE

A

resin modified ZOE

EBA ZOE

34
Q

What is resin modified ZOE

A

resin is added to the power and liquid

35
Q

What advantages does resin modified ZOE have

A
  • greater strength and decreased solubility.
  • Resin modified ZOE is suitable as a liner.
36
Q

What is EBA ZOE

A

has ethoxybenzoic acid

37
Q

What are advantages of EBA ZOE

A
  • stronger than the other ZOEs and less soluble
38
Q

What is the setting reaction for ZOE

A

Acid base reaction + chelation

39
Q

What are useful properties for ZOE

A
  • Low thermal conductivity
  • Radiopaque
40
Q

What are not so useful properties for ZOE

A
  • Low strength
  • High solubility
  • CANT BE USED WITH COMPOSITE
41
Q

Why is ZOE’s high solubility not necessarily a negative thing in some circumstances

A
  • it constantly releases eugenol and eugenol has a obtundent (obtundent means ‘lessening pain/irritation’) effect on the pulp
42
Q

What are uses of ZOE

A
  • Base (but can also be used as a liner in very deep cavities)
  • Temporary restorations
  • Root canal sealer (slow setting)
  • Periodontal dressings (fast setting)
  • Used in primary RCT as it is resorbable
43
Q

What is the brand name for resin modified ZOE used in GDH

A

kalzinol / IRM

44
Q

What are the two types of GI

A

conventional + RMGIC

45
Q

How does conventional GI come

A

acid and base

46
Q

What are the constituents of the acid in conventional GIC

A
  • Polyacrylic acid
  • Tartaric acid (controls setting)
47
Q

What is the composition of the base in conventional GI

A
  • Silica
  • Alumina
  • Calcium fluoride
  • Aluminium fluoride
  • Aluminium phosphate
  • Sodium fluoride
48
Q

What is the setting reaction for conventional GI

A
  • Acid base reaction with 3 phases - dissolution, gelation, hardening
49
Q

What happens in the dissolution phase (GI setting reaction)

A

acid reacts with outer layer of glass leaving an unreacted glass core with silica gel on the outside

50
Q

What happens in the gelation phase (GI setting reaction)

A

calcium cross linking

51
Q

What happens in the hardening phase (GI setting reaction)

A

aluminium cross linking

52
Q

What are useful properties of conventional GI

A
  • bonds to tooth
  • Good thermal expansion
  • Fluoride release
  • Lower modulus
53
Q

What are not so useful properties of conventional GI

A
  • Not very strong
  • Not very hard (worn away easily)
  • Higher solubility especially when first placed
54
Q

How does GI bind to tooth

A
  • Binds to tooth via ion exchange (calcium in enamel/dentine) and hydrogen bonding (collagen in dentine)
55
Q

What are uses of conventional GIC

A
  • Base
  • Liner
  • Temporary restoration
  • Restoration
  • Fissure sealants
  • Luting
56
Q

How does RMGIC come

A

powder and liquid

57
Q

What is in RMGIC powder

A
  • Fluro-alumino-silicate glass
  • Barium glass (for radiopacity)
  • Vacuum dried polyacrylic acid
  • Potassium persulphate (for redox reaction)
  • Ascorbic acid
  • Pigments
58
Q

What is in RMGIC liquid

A
  • HEMA
  • Polyacrylic acid with pendant methacrylate groups
  • Tartaric acid
  • Water
  • Photoinitiator
59
Q

What is the setting reaction for RMGIC

A

dual curing & tri curing

60
Q

What is dual curing

A
  • initially get the same reaction as conventional, light activation results in resin matrix being formed while acid base reaction continues within it
61
Q

What is tricuring

A
  • has a redox reaction as well to try encourage sufficient curing where there is insufficient light penetrating
62
Q

What are useful properties of RMGIC

A
  • fluoride release
  • command set
  • stronger than normal GIC + better aesthetics
63
Q

What are not so useful properties of RMGIC

A
  • Polymerisation contraction
  • Reduced strength if it is not light cured properly
  • HEMA can be cytotoxic
64
Q

What are uses of RMGIC

A
  • Liner
  • Base
  • Restoration material
65
Q

What is the brand name of RMGIC

A

vitrebond

riva light cure (more viscous)

BDS3 OSCE (65 decks)

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