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BDS2 CDS DMS > 5. Composite Resins: Part 2 > Flashcards

5. Composite Resins: Part 2 Flashcards

1
Q

Properties that affect the choice of material (10)

A 
Mechanical
Bonding
Thermal
Aesthetic
Handling/viscosity
Surface finish
Polymerisation shrinkage
Anticariogenic
Biocompatible
Radiopacity
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2
Q

Clinical requirements of large posterior cavity (3)

A

High strength
High rigidity
High abrasion resistance

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3
Q

Clinical requirements of deciduous restoration (4)

A

Strong in thin section
Wear of tooth
Bonding
Microleakage

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4
Q

Types of composite (3)

A

Conventional
Microfine
Hybrid

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5
Q

Features of conventional composite (2)

A

Strong

Problems with finishing and staining due to soft resins and hard particles

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6
Q

Features of microfine composite (3)

A

Smaller particles
Allows for smoother surfaces (better aesthetics for longer periods)
Inferior mechanical properties (elastic limit and rigidity)

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7
Q

Features of hybrid composites (2)

A

Compromise between conventional and microfine composites

Improved filler loading and coupling agents cause improvement in mechanical properties

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8
Q

Definition of hardness (3)

A

Resistance to scratching or indentation resistance
Related to material surface
Measured by the amount of surface indentation (KHN)

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9
Q

Definition of abrasion (2)

A

Abrasion occurs when the tooth grinds/slides along the opposing tooth surface (or restorative material at its surface
Abrasion leaves behind a rough surface

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10
Q

What does surface roughness affect (3)

A

Appearance
Plaque retention
Sensation when in contact with tongue (laceration)

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11
Q

Process of tooth wear of composite resins (4)

A

Resin is removed
Leaves some of the filler particle exposed
If enough resin is removed, the filler particle is dislodged, leaving a “cut” out of the resin
Process continues

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12
Q

Factors that affect tooth wear (2)

A

Material factors

Clinical factors

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13
Q

Material factors that affect tooth wear (5)

A 
Filler material
Filler size distribution
Filler loading
Resin formulation
Coupling agents
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14
Q

Clinical factors that affect tooth wear (7)

A 
Cavity size
Cavity design
Tooth position
Occlusion
Placement technique
Cure efficiency
Finishing methods
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15
Q

Features of material/tooth bonding (2)

A

Bonding to enamel occurs through acid etch technique

Bonding to dentine occurs through dentine/universal bonding agents (DBAs)

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16
Q

Typical bonding strength of composite to enamel/dentine

A

40MPa

Dependent on the surface preparation of tissue, composite brand and test method

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17
Q

Function of good material/tooth surface bonding (3)

A

Help reduce microleakage
Help to counteract polymerisation shrinkage
Help to reduce the likelihood of a gap between the restoration and tooth

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18
Q

Features of composite restoration placement (2)

A

Will not have to withstand full stress - the stress will be transferred to tooth and bone
Poor bonding to tooth concentrates stress on the restoration, so failure is more likely

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19
Q

Compressive strength of enamel

A

250MPa

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20
Q

Compressive strength of dentine

A

280MPa

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21
Q

Compressive strength of amalgam

A

350MPa

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22
Q

Compressive strength of (hybrid) composite

A

300MPa

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23
Q

Compressive strength of microfilmed composite

A

260MPa

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24
Q

Compressive strength relationship between materials (4)

A

Amalgam > composite > dentine > enamel

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25
Elastic limit (Yield) stress of (hybrid) composite
300MPa
26
Elastic limit (Yield) stress of microfilled composite
160MPa
27
Tensile strength of enamel
35MPa
28
Tensile strength of dentine
40-260MPa
29
Tensile strength of amalgam
60MPa
30
Tensile strength of (hybrid) composite
50MPa
31
Tensile strength of microfilled composite
40MPa
32
Tensile strength relationship between materials (4)
Dentine > amalgam > composite > enamel
33
Flexural strength of (hybrid) composite
150MPa
34
Flexural strength of microfilled composite
80MPa
35
Elastic modulus of enamel
50GPa
36
Elastic modulus of dentine
12GPa
37
Elastic modulus of amalgam
30GPa
38
Elastic modulus of (hybrid) composite
14GPa
39
Elastic modulus of microfilled composite
6GPa
40
Elastic modulus relationship between materials (4)
Enamel > amalgam > composite > dentine
41
Hardness of enamel
350VHN
42
Hardness of dentine
60VHN
43
Hardness of amalgam
100VHN
44
Hardness of (hybrid) composite
90VHN
45
Hardness of microfilled composite
30VHN
46
Hardness relationship between materials (4)
Enamel > amalgam > composite > dentine
47
Thermal properties include (2)
Thermal conductivity | Thermal expansion coefficient
48
Ideal thermal properties of composite
Thermal conductivity should be low to avoid pulpal damage from hot and cold foods/fluids Thermal expansion should be equal to that of the tooth, to reduce microleakage
49
Actual thermal properties of composite
Low thermal conductivity | High thermal expansion coefficient
50
Thermal expansion coefficient of enamel
11ppm/C
51
Thermal expansion coefficient of dentine
8ppm/C
52
Thermal expansion coefficient of amalgam
22-28ppm/C
53
Thermal expansion coefficient of composite
25-68ppm/C
54
Thermal expansion coefficient of GIC
10-11ppm/C
55
Thermal expansion coefficient of ceramic
8-14ppm/C
56
Thermal expansion coefficient of gold alloy
12-15ppm/C
57
Thermal expansion relationship between materials (7)
Composite > amalgam > gold alloy > ceramic > enamel = GIC > dentine
58
Components of aesthetic properties (5)
``` Shade range Translucency Maintenance of properties over lifetime Resistance to staining Surface finishing ```
59
Why should composite restorations be radiopaque
To allow secondary caries to be diagnosed more easily on radiographs
60
Handling/viscosity properties of composite (4)
Light-curing Mixing/working times Viscosity User-friendly
61
Composite setting shrinkage
Low | Polymerisation shrinkage is still a problem as stresses develop at hard tissue surfaces, making de-bonding more likely
62
Bonding occurs between (2)
Filler and resin particles | Resin and hard tissues

BDS2 CDS DMS (15 decks)

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