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Quiz 5 Flashcards

1
Q

o Tooth-colored restorative material
o Used in both anterior and posterior areas of mouth
o Placed directly and indirectly
o Less fracture toughness than metallic restorations

A

Composite resin

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2
Q

What are the five components to composite resin?

A

Organic resin matrix
Inorganic filler particle
Silane coupling agent
Initiators/Accelerators
Pigments

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3
Q

What is organic resin matrix made of?

A

Bis-GMA
UDMA

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4
Q
  • Make composite stronger
  • Make composite more wear resistant
  • Reduce amount of shrinkage occurs when composite is set
A

Inorganic filler particles

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5
Q

Makes sure composite sets

A

Initiators/Accelerators

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6
Q

Match color to tooth structure

A

Pigments

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7
Q

Chemical reaction of small monomers forming long chain polymers

A

Polymerization

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8
Q

activating initiator by chemical, heat, light, or dual cure

A

Activation

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9
Q

free radical formed to react with monomers to start growing chain

A

Initiation

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10
Q

heat from chemical reaction

A

Exothermic

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11
Q

How long does it take for chemical cure base + catalyst to harden?

A

About 2 minutes

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12
Q

How long does it take light cure curing light to harden?

A

Unlimited worked time

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13
Q

shrinkage occurring when composite has been cured

A

Polymerization shrinkage

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14
Q

How is polymerization shrinkage reduced?

A

more filler in composite & incremental placement

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15
Q

How is coefficient of thermal expansion reduced?

A

More filler in composite

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16
Q

How is strength & abrasion resistance reduced?

A

More filler in composite

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17
Q

What can fillers be made of?

A

Engineering glass
Quartz
Silica
Ceramic

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18
Q

What determines surface smoothness?

A

Filler size

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19
Q

What size particles make a smoother surface?

A

Smaller particles

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20
Q

What determines viscosity and handling?

A

Amount & size/shape of filler

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21
Q

What equals decreased resin content?

A

Icreased filler

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22
Q

What are the classifications of composites by filler size?

A

Macrofilled
Microfilled
Hybrid
Nanofilled composites

23
Q

 First developed
 Larger particles
 Generally stronger than composites with smaller particles

A

Macrofilled composites

24
Q

Why do we no longer utilize macrofilled composites?

A
  • Difficult to polish
  • Become rough when polished
  • High staining potential
25
 Developed to overcome problems with macrofilled composites  Smaller particles  Smoother polish & glass than macrofilled composites  Weaker, greater shrinkage
Microfilled composites
26
What has the best esthetics of all composites?
Microfilled composites
27
What sites can microfilled composites be used on?
Class III, IV, V
28
 Large & small particles  Combine strength and esthetic appeal of macro and micro  Strong, polishes well, wear resistant  Suitable for anterior and posterior sites
Hybrid composites
29
What sites can hybrid composites be used on?
Class I-V
30
What composites should be used on patients with a low caries risk?
Hybrid composites
31
 Smallest particle  Best polish  Low shrinkage  High strength  High wear resistance
Nanofilled composites
32
What sites can nanofilled composites be used on?
All class sites
33
Class? -Pits and fissures of posterior teeth, lingual of maxillary incisors
Class I
34
Class? -Proximal surfaces of posterior teeth
Class II
35
Class? -Proximal surfaces of anterior teeth
Class III
36
Class? -Proximal surfaces of anterior teeth and the incisal edge
Class IV
37
Class? -Cervical third of anterior and posterior teeth
Class V
38
Class? -Incisal edges of anterior teeth, cusp tips of posterior teeth
Class VI
39
 Low viscosity, flows well into prep * Adapt well to cavity walls and surface irregularities  Well-suited for conservative dentistry
Flowable composite
40
What are the uses of flowable composites?
* Liners in large cavity prep * Cervical lesions * Class I, small, low stress bearing restorations
41
 Aka condensable composite  High viscous & stiff – high filler content  Stronger and more wear resistant than most hybrids  Marketed as substitutes for amalgam  Less likely to stick to instruments used to place
Packable composite
42
What sites can packable composite be used on?
Class I, II, IV sites
43
How can composites be detected?
-Softer than enamel -Radiographs
44
What is added to composites to be identified on radiographs?
Barium Strontium
45
What are the two types of glass ionomer cements?
Conventional glass ionomers Resin-modified glass ionomers
46
o Polyacrylic acid + fluoroaluminosilicate glass powder o Fluoride releasing o Bond to tooth structure without a bonding agent o Least esthetic o Very radiopaque
Glass ionomer cements
47
What are the 3 ways glass ionomer cements can be used?
Luting cement Restorative materials Liners & bases
48
Release fluoride, low film thickness, good for pulp, bond to tooth structure, crown seated easily
Luting cement
49
Weak tensile strength, release fluoride, non-carious class V or root caries, no stress-bearing sites
Restorative materials
50
Thermal protection, protection against chemicals during restoration
Liners & bases
51
o Blend of resin + glass ionomer o Created to improve on properties of glass ionomers
Resin-modified glass ionomers
52
What are resin-modified glass ionomers used for?
 Cervical lesions  Low stress-bearing  Class III and V sites  Pediatric restorations in primary teeth
53
o Similar to composite, modified with polyacid o Composite systems that release fluoride o Bonds & sets like dentinal bonding o Used in low stress bearing class III and V sites
Compomers

Dental Materials (14 decks)

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