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Operative 2-Final Quiz > Lecture 1 > Flashcards

Lecture 1 Flashcards

1
Q

Direct Restoration

A

Inserted as a soft material , tooth colored restorations, composite and glass ionomers are examples

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2
Q

Indirect Restoration

A

Fabricated outside of the mouth and cemented or bonded to the tooth, full coverage example is zirconia crowns, partial coverage examples include: veneers, ceramic inlays and onlays.

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3
Q

Composite characteristics

A

-polymer base, static, mechanical properties comparable to amalgam, wear resistance was a concern in older composites, micromechanical retention-resin tags and a hybrid layer.

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4
Q

Glass ionomer characteristics

A

-Water based, dynamic/functional-fluoride reservoir, decrease mechanical properties, wear resistance good, chemically bonds (ionic bond-not strong)

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5
Q

Advantages of posterior composites

A

-esthetic, conservative to tooth structure, easy prep

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6
Q

Disadvantages of posterior composites

A

-Technique sensitive, effects of polymerization shrinkage

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7
Q

Resin matrix of dental composite

A

Bis-GMA and TEGMA

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8
Q

Filler of composite

A

irregular and spherical particles (range of sizes)

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9
Q

Coupling agent of dental composite

A

Silane

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10
Q

What type of polymer is the resin matrix of composite resin?

A

small oligomers of Bis-GMA and TEGMA

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11
Q

What is the photosensitive agent in composite?

A

Camphorquinone

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12
Q

Polymerization shrinkage leads to…

A

Polymerization stresses, micro gaps

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13
Q

Microgaps can be prevented by what two things?

A

Layering technique, using flowable composite prior to composite “Elastic theory”

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14
Q

If composite had more filler and less resin, what would result?

A

Improve mechanical behavior, less polymerization shrinkage, decrease coefficient of thermal expansion.

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15
Q

What would happen if more small filler were used than large filler?

A

no-plucking of particles, less wear, high polish

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16
Q

If too little filler is used…

A

slump and sticky

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17
Q

If too much filler is used…

A

increase in viscosity, hard to handle

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18
Q

What are the size of macrofill fillers?

A

10-50 micrometers

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19
Q

What size are the microfill fillers?

A

40-50 nm

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20
Q

What size are the nanofill fillers?

A

5-100 nm

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21
Q

What type of particles are in macrofill composites and what are its properties?

A

Very large filler particles, rough surface from plucking, low wear resistance.

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22
Q

What type of fillers are in homogenous mircrofillers and what are its properties?

A

Very small fillers, 40 nm, polishibilty and wear resistance optimal, placed in esthetic non-stress bearing area in young patients. (filler vol. 25-42%)

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23
Q

What is an examples of homogeneous microfill composite?

A

Durafill VS

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24
Q

Why do homogenous microfills not work as posterior composites?

A

High viscosity-difficult to handle, clustering (compromise esthetics)

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25
Q

Conventional hybrids where a combination of what and were used where?

A

microfillers and macrofillers, posterior composites

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26
Q

What are the properties of microhybrids?

A
  • filler size range <1 micrometer.
  • 60% loading capacity
  • good handling properties
  • used on anterior and posterior restorations
27
Q

What are some examples of microhybrids?

A

Point 4 (kerr), Herculite XRV (Kerr), Estheti-x (Dentsply), TPH Spectra.

28
Q

What is an example of nanocomposite and what are its’ contents?

A

Filtrek Supremem Ultra Universal (3M), no glass fillers, only silica particles ranging from 5-100 nm and aggregations of silica clusters (nanoclusters)

29
Q

Conventional

A

putty like consistency

30
Q

Flowable

A

Light consistence

31
Q

Packable

A

Condensable/moldable

32
Q

Degree of conversion

A

Number of carbon double bonds of monomer that are converted to single bonds to form polymers.

33
Q

Depth of cure

A

2mm

34
Q

Distance of curing tip

A

~1mm

35
Q

Thickness of composite during curing

A

1.5 mm

36
Q

Depth of cure of Bulkfill

A

5 mm

37
Q

Examples of bulk fill

A

Sonicfill and Tetric Evoceram, less viscous and photoinitiators that increase depth of cure.

38
Q

What are the 3 types of retainer systems?

A
  1. Tofflemire retainer and circumferential band. 2. Retainless matrix system-absence of matrix retainer. 3. Sectional matrix.
39
Q

Rings

A

prongs that produce the separation between teeth, made of plastic, silica pads.

40
Q

Dead soft bands are how thick?

A

0.001”

41
Q

How thick are tofflemire bonds?

A

0.0015”

42
Q

What are the roles and requirements of wedges?

A
  1. Seal the gingival margin to prevent overhang.
  2. Should not interfere with making of proximal contact.
  3. Wedges adjacent teeth to compensate for the bands thickness.
43
Q

What are the steps of composite restorations (according to Mikhail)?

A
  1. Anesthetic-Isolate-Select shade
  2. Etch with phosphoric acid
  3. Rinse thoroughly
  4. Lightly air dry
  5. Apply and cure adhesive
  6. Apply and cure composite layers
  7. Remove rubber dam
  8. Evaluate margins-check for excess/deficiencies
  9. check for proximal contact
  10. Check occlusion
  11. Adjust occlusion
44
Q

What type of acid is etch and what percent?

A

Phosphoric acid 37%

45
Q

What two things does adhesive supply?

A

Resin tags and hybrid layer

46
Q

How long should you etch?

A

15-20 secs

47
Q

What can collapse if etched for too long?

A

Collagen fibers in dentin can collapse (enamel has small amount of collagen so it does not affect it as much)

48
Q

Etching opens dentin tubules by?

A

removing smear plugs

49
Q

What can over drying do?

A

Evaporate water out of tubules which can cause bite sensitivity

50
Q

What are the two types of of adhesive systems?

A
  1. Total etch system-when there are enamel margins. 2 pH. 2. Self etch adhesive, no etch and rinse step, 3-5 pH
51
Q

Two step, total etch system

A

Etch + (Prime and Bond)

52
Q

Three step, total etch system (conventional)

A

Etch, prime, bond

53
Q

Two step, self-adhesive

A

acidic primer + bonding agent

54
Q

One step, self etch adhesive

A

acidic primer with bonding agent

55
Q

What type adhesive system do we use?

A

Optibond Solo plus Kerr-2 step, total etch system. (allows for less etch time of dentin)

56
Q

What are 3 composite instruments we use?

A

BBL, CVIPC, 8A

57
Q

What are some finishing burrs we use?

A

Football (7379), ET9, 7901, 7379, 7404, 7406

58
Q

On plastic teeth, which handpiece do we use?

A

Slow-speed

59
Q

What are some characteristics of resin modified glass ionomers?

A
  • Good seal, chemically bonds
  • Mechanical properties not as good as composite
  • Less soluble than glass ionomer
60
Q

What are some main differences between GIC and RMGIC?

A

GIC: affected by moisture due to slow setting reaction, acid vulnerability, initial solubility, brittle

RMGIC: Not affected by moisture, initial solubility is low, less acid disintergration

61
Q

T or F: RMGIC is used as a liner and base?

A

T

62
Q

What are examples of RMGIC liner or base?

A

Vitrebond, GC FUJI II LC

63
Q

T or F, condition and base with glass ionomer before placing the composite?

A

T

64
Q

Open sandwich technique.

A

Good seal around high risk area, layering minimizes shrinkage stress on box floor, good tissue response, helps to achieve good contacts and form.

Operative 2-Final Quiz (3 decks)

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