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3rd Year BDS > Dental Material Pros/Cons/Indications/Contras > Flashcards

Dental Material Pros/Cons/Indications/Contras Flashcards

1
Q

RMGIC - constituents? resin?

A

GIC + water-soluble resin and modified poly(acryclic acid)

HEMA

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2
Q

RMGIC - key advantages?

A

Seals dentinal tubules and decreases risk of microleakage
Sustained release of F (increases degrade)
Ca and collagen bonding
Long working time
Limited moisture sensitivity
Releases bacteriostatic benzoyl iodides/bromides

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3
Q

RMGIC - key disadvantages?

A 
Prone to staining with time
Shrinkage
Swelling (moisture uptake)
Exothermic on curing
Monomer leach
Benzoyl iodides/bromides cytotoxic
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4
Q

RMGIC - indications?

A

Small-sized C I
C III and V
Non-carious tooth surface loss
Only few shades available
Core build-ups (>50% tooth remaining)
Open and Closed sandwiches
Dressing (alternative to GIC for command set)
Luting***
Restore deciduous (minimally invasive and F)
Linings (seal tubules, bacteriostatic, F and radiodense)
Bonding dental amalgam
Blocking undercuts for indirect restorations (bond tissue and easy handling)

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5
Q

RMGIC - presentations?

A

Powder/liquid
Encapsulated (less voids)
Paste/paste system (increase wear resist)

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6
Q

RMGIC - summary?

A 
Limited advantages over GIC
HEMA cytotoxic
Improved F release
Mech props > GIC
Particularly for luting restorations
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7
Q

RMGIC - contraindications?

A

For direct placement on both pulpal and periradicular vital tissue

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8
Q

Amalgam - constituents?

A

Alloy + mercury

Alloy containing silver, tin and copper + mercury

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9
Q

Amalgam - key advantages?

A

Compressive strength
Early strength
Spherical alloy stronger

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10
Q

Amalgam - key disadvantages?

A

Tensile strength
Creep y1
Corrosion y1
High thermal diffusivity

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11
Q

Amalgam - indications?

A

Class I and II cavities
(Class III and V)
Cores for cast restorations

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12
Q

Amalgam - cavity design?

A 
Depth - 2mm
Rounded line angles
Cavo-surface angles 90-110
No unsupported enamel
Retention form (undercuts and slots)
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13
Q

Amalgam - benefits of bonding? bonding material?

A

Increased retention and fracture resistance
Decreased microleakage, trauma, inflammation, PostOP sensitivity, recurrent caries, cuspal deflection
Resin based composite adhesive
Little in vivo evidence

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14
Q

Amalgam - presentation?

A

Encapsulated - easier mix, dispense

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15
Q

Amalgam - adverse effects?

A 
Enamel discolouration (dentine permeability)
Amalgam tattoo (migrate to soft tissue)
Lichenoid (hypersensitivity)
Galvanic cell (2 different metals and saliva)
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16
Q

Amalgam - contraindications?

A

Pregnant women
Allergy
Aesthetics
Objection

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17
Q

Amalgam - summary?

A

Higher copper, spherical or admixed alloy performs better

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18
Q

GIC - name? constituents?

A

Glass Polyalkenoate cement

Glass and polyacrylic acid

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19
Q

GIC - mechanical properties?

A

Compressive strength = dentine

Strength increases with time

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20
Q

GIC - bonding?

A

Chemical bonding: H bond with collagen and form a Ca polyacrylate salt replacing the hydroxyapatite structure
Bonds can reform

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21
Q

GIC - indication?

A 
Intervisit endodontic material
Restore deciduous 
Atraumatic restorative technique
Tunnel preps
C III 
CV (especially nn-carious tooth loss)
Long-term temporisation/intermediate restoration
Core build-ups
PRR
Base/Liner
Dressing (non-retentive cavity or composite as final material) 
Fissure sealants
Luting (crown and bridge retainers)
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22
Q

GIC - key advantages?

A 
F release (can be replenished)
Less staning than composite (but less shade variation)
Composite > GIC for aesthetics
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23
Q

GIC - contraindications?

A

High load C I or C II
Large posterior cavities
Core build ups with little tooth
Aesthetics

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24
Q

GIC - presentation?

A

Encapsulated

Powder/liquid

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25
Q

GIC - summary?

A

Composite > GIC mechanically but F release

Need protection from moisture contamination and desiccation

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26
Q

ZPC - constituents?

A

Zinc oxide + poly(acrylic acid)

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27
Q

ZPC - mechanical properties?

A

Lower modulus of elasticity and less likely to fracture under heavy load

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28
Q

ZPC - indications?

A

Temporary restorations (especially non-retentive cavities due to chem bonding, no entering tubules and it’s a sedative)
Future restoration to be composite
Bases (seales dentine due to adhesive props but superseded by RMGIC)
Definitive luting of metallic/ceramic crowns
Cementation of ortho bands

29
Q

ZPC - summary?

A

Non-toxic to pulp

Bond chemically to dentine

30
Q

ZPC - key advantages?

A

Bonds tissue and resto material

Long-term durabilty

31
Q

ZPC - key disadvantages?

A

Hard mixing
Opaque
Hard manipulation
ill-defined set

32
Q

ZOE - constituents?

A

Zinc oxide + eugenol -> Zinc eugenolate

33
Q

ZOE - presentations?

A

Power/liquid

Paste/paste

34
Q

ZOE - reinforced with?

A

Temporary cement
EBA-reinforced Zinc Oxide Eugenol cement
Ortho-ethoxybenzoic acid (EBA)

35
Q

ZOE - key advantages?

A

Needs to be used in 2mm to function as base
Bactericidal
Bland sedative
Reduces leakage and pulpal inflammation

36
Q

ZOE - key disadvantages?

A 
May contains air voids
Never place on vital pulp - cytotoxic
Mechanical retention 
Poor interaction with resin composite
Opaque
37
Q

ZOE - indications?

A 
Temporary restorations 
Base
Temporary luting
Long-term temporary restorations
Root end filling
Endodontic sealer
Impression material 
Long-term temporisation
38
Q

ZOE - contraindications?

A 
Temporary restorations in non-retentive cavities
Direct on pulp
Under/With resin composite
Definitive luting
Exposure to oral fluids
39
Q

Compomer - constituents?

A

Dimethacrylate and difunctional resin monomer containing both carboxyl and methacrylate groups

40
Q

Compomer - mechanical properties?

A

Lower compressive, flexural strengths and elastic moduli compared to composite

41
Q

Compomer - bonding?

A

Intermediate bonding system

42
Q

Compomer - key advantages?

A 
Release F (much lower than GIC/RMGIC)
Less wear resistance than composite
43
Q

Compomer - key disadvantages?

A

Staining from oral fluids

44
Q

Compomer - indications?

A 
C III - strong and aesthetic 
CV - flexible for abfraction lesions
Fissure sealants - flowable
Luting - metal based and indirect restorations
Resto deciduous (bonding)
45
Q

Compomer - contraindications?

A 
Aesthetics  (composite better)
Core-build ups (not strong enough)
Luting ceramics (fracture risk)
C I, II and IV (fracture risk)
Inter-visit restorations (poor sealing for microleakage)
46
Q

CaOH cement - base vs lining?

A

Base:
- function as a barrier against chemical irritation, providing thermal insulation and resists forces applied during condensation of restorative material (structural forms)
Lining:
- Placed as thin coatings and their function is to provide a barrier against chemical irritation (no thermal insulation) (no structural form)

47
Q

CaOH - indications?

A

Lining

48
Q

CaOH - constituents?

A

CaOH + salicylate ester forming Ca disalicylate complex

49
Q

CaOH - mechanical properties?

A

Weakest material
Deforms
Thin sections only

50
Q

CaOH - key advantages?

A

Formation of reparative (tertiary) dentine

Forms physical barrier over exposed pulp allowing material to seal tubules

51
Q

CaOH - key disadvanatges?

A 
Low compressive strength
No adhesion to dentine
Local irritation
Exothermic reaction
Shrinkage
52
Q

CaOH - indications?

A

Deep cavity over pulpal floor

Indirect and direct pulp capping

53
Q

Ca3SiO5 - physical properties?

A

Compressive and hardness to dentine
Flexural modulus as dentine
High dimensional stability
Doesn’t discolour

54
Q

Ca3SiO5 - indications?

A 
Placed on dentine and vital pulp tissue (pulpal cell proliferation)
Deep cavities
Reversible pulpitis (dressing)
Carious or iatrogenic exposure
Trauma
Pulpotomy in primary molars
Perforation repairs
55
Q

Ca3SiO5 - contraindications?

A

Don’t layer with GIC or ZOE
Don’t etch with H3PO4 (use selective)
Need >2mm of resin composite to mask opacity
Don’t desiccate

56
Q

Composite - constituents?

A

Resin + filler bound together by a silane coupling agent

57
Q

Composite - key advantages?

A 
Aestehtics
Minimally invasive
Command set
Repaired
Bonded to enamel and dentine
Reduced microleakage
Lowe thermal conductivity
58
Q

Composite - key disadvantages?

A 
Time consuming
Hydrophobic
Photophilic
Shrinkage
Technique sensitive
Decreased longevity with higher # of surfaces
Attract more bacteria than amalgam (unless well polished)
Difficult to finish
59
Q

Composite - presentation?

A

Universal - all applications
Flowable - for ultraconservative restorations
Packable - posterior situations

60
Q

Universal composite - indications?

A

C III
C IV
Incisal non-carious tooth surface loss
Reinforcing fibres for splinting
CV where retention is by undercut (carious)
C I and C II if indicated by manufacturer

61
Q

Universal composite - contraindications?

A

Aesthetics are critical
Moisture control can’t be achieved
Inadequate enamel

62
Q

Flowable composite - mechanical properties?

A 
Compared to universal:
Less compressive strength
Less wear resistant
Greater shrinkage
Lower modulus of elasticity (increased flexibility)
63
Q

Flowable composite - indications?

A

Small C I (with enamel only or small amount of dentine perm or decid)
CV (non-carious)
Repair ditched amalgam margins
Lining material (with packable composite)
Block undercuts (inlay prep)
Enhance bond between enamel and heavily filled composite at bottom of C II box
Ceramic repairs in non-stress situations
Repair bis-acryl composite temporary restorations

64
Q

Flowable composite - contraindications?

A

High stress situations (edges and cusps)
Resto of anything greater than small C I
Any C II
Moisture control can’t be achieved

65
Q

Packable composite - mechanical properites?

A

Increases fracture resistance

Increased void risk

66
Q

Packable composite - indications?

A

Posterior use

67
Q

Bulk fill composite - mechanical properties?

A 
Good wear resistance
Strength
Sculptable
Good radiodensity
Good adaptation for cavity
Fewer voids
Increased modulus of elasticity 
Reduced shrinkage 
Bond resin-based materials
68
Q

Bulk fill composite - disadvantages?

A

Less compressive, decreased hardness and decreases wear resistance

69
Q

Bulk fill composite - indications?

A 
Direct anterior and posterior resto
Lining under direct resto
Core build ups
Splinting
Indirect resto
Resto deciduous
Fissure seal and PRR
Repair defects in ceramic resto and temporaries

3rd Year BDS (21 decks)

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