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Operative > Midterm 1: O Composite Prep + Restoration + Adhesives and Composites > Flashcards

Midterm 1: O Composite Prep + Restoration + Adhesives and Composites Flashcards

1
Q

What are the cavity classifications?

A

Class I
Class II
Class III
Class IV
Class V
Class VI

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2
Q

What is a Class I Cavity?

A

pits and fissures of occlusal surfaces of posterior teeth
occlusal 2/3 of buccal and lingual of molars
lingual of maxillary incisors

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2
Q

What is a Class III Cavity?

A

Proximal surfaces of anterior teeth

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3
Q

What is a Class II Cavity?

A

proximal surfaces of posterior teeth

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4
Q

What is a Class V Cavity?

A

Gingival third of teeth

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4
Q

What is a Class IV Cavity?

A

Proximal surfaces and incisal edge of anterior teeth

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5
Q

What is a Class VI Cavity?

A

Incisal edge of anterior teeth and cusp tips of posterior teeth

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5
Q

The ICDAS uses __________ assessment, NOT sharp instruments.

A

visual

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6
Q

What ICDAS categories are in the moderate caries management stage?

A

ICDAS 3-5

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7
Q

Which ICDAS categories are in the severe caries management stage?

A

ICDAS 6

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8
Q

What ICDAS categories are in the initial caries management stage?

A

ICDAS 0-2

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8
Q

What is the cavosurface margin?

A

The junction of a prepared wall and external surface of the tooth
where the CAVITY preparation meets the ORIGINAL tooth surface

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9
Q

What is a line angle?

A

line between two points
junction of two walls

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10
Q

What is a point angle?

A

junction of three lines/walls

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11
Q

What is the outline form?

A

external outline of the tooth surface to be included in the prep along the cavosurface margin

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12
Q

What is retension form?

A

prevention of restoration displacement

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12
Q

What is convenience form?

A

access and visibility

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13
Q

What is resistance form?

A

prevention of restoration (and/or tooth) fracture from occlusal forces

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14
Q

What is the mesio-distal angulation of mandibular teeth?

A

Bur is tipped lingually

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14
Q

Why are buccal/lingual walls parallel to slightly truncated on the long axis of the crown?

A

help in retention
avoid damaging the pulp

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15
Q

What is the 6th gen self etch technique?

A

self etching primer and adhesive separate

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16
Q

What is the 7th gen adhesive system?

A

etch, primer, adhesive combined into one

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17
Q

What is the selective etch technique?

A

35-37% phosphoric acid etch
etchant only on enamel
rinse off after 15 seconds
dry

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18
Q

Why do we scrub the scotchbond onto the preparation for 20 seconds?

A

To ensure the adhesive gets into the grooves created by the etch

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19
Q

What are the components of the ultradent wetting resin?

A

45% filled resin
no solvents
does not inhibit polymerization
use very small amount
prevents composite from sticking to instrument

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20
Q

What are neoshine polishers?

A

designed to polish nanocomposite

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21
Q

What does Satin Neoshine Polishers do?

A

removes scratches and imperfections for a smooth shine

22
Q

What are Hi-Gloss Neoshine Polishers?

A

high luster

23
Q

TRUE OR FALSE

enamel bonding is reliable, predictable, and strong

A

TRUE

24
Q

Acid etching transforms smooth enamel surface into what?

A

irregular (porous) surface

25
Q

What is the smear layer?

A

layer of organic and inorganic debris that seals the dentinal tubules
reduces permeability
caused by instrumentation of the preparation

26
Q

Why is the smear layer bad or good?

A

BAD: interferes with adhesion
GOOD: reduces post operative sensitivity

27
Q

How does the smear layer reduce post operative sensitivity?

A

smear layer PLUGS the dentin tubules
prevents the fluid inside to be exposed

28
Q

Which is easier: dentin bonding or enamel bonding? Why?

A

Enamel bonding
enamel structure is more structured/predictable
therefore easier to etch
DENTIN TUBULES and collagen are like a MAZE
Dentin is filled with fluids and enzymes that may interfere with bond integrity

29
Q

Dentin bonding includes which three steps?

A

Etch
Primer
Adhesive (Bond)

30
Q
A
31
Q

What is the purpose of etch?

A

removes the smear layer

32
Q

Etched enamel creates what?

A

microporosities
chalky/froster white appearance if you air dry it

33
Q

What does etched dentin do?

A

exposes layer of collagen
widens dentinal tubules

34
Q

Is resin hydrophobic or hydrophillic?

A

hydrophobic

35
Q

Primer contains a ________________- end that interacts with the moisture on the tooth and a _____________ end that provides bonding sites for the adhesive

A

Hydrophilic
Hydrophobic

36
Q

What is the primer’s function in dentin bonding?

A

infiltrates dentinal tubules
wets dentin surface
prevents collagen collapse
keeps the “spaghetti” moist/upright for micromechanical interlock

37
Q

Do we need primer for enamel bonding?

A

No

38
Q

What is Bis-GMA

A

part of adhesive/bond
bonds to underlying primer and overlying composite resin

39
Q

Why do we gently air thin the primer and the adhesive for a few seconds?

A

to evaporate the solvent which we no longer need at this point, leaving a nice thin layer of primer/adhesive inside the cavity prep
TO MAKE THE LAYER THIN AND NOT TOO BULKY

40
Q

What does the primer and adhesive create?

A

the hybrid layer

41
Q

What type of interface does the hybrid use?

A

mechanical

42
Q

What are resin tags?

A

adhesive resin lock into the microporosities of etched enamel and dentinal exposed collagen and widened tubules

43
Q

What kind of bond is there between the tooth structure and the prime/bond (adhesive)?

A

Micromechanical

44
Q

What kind of bond is there between the primer, the adhesive, and the resin?

A

Chemical

45
Q

Which generations reduced post op sensitivity since smear layer is providing some sealing of dentinal tubules?

A

6/7

46
Q
A
47
Q

What are the components of composite resin?

A
  1. Resin Matrix
  2. Filler (Silica)
  3. Coupling agent (Silane)
48
Q

What are the characteristics of resin matrix?

A

Bis-GMA (resin) + initiator
monomers become polymers after curing light
negligible health hazard

49
Q

What are the characteristics of filler (silica)?

A

Radiopaque
various shapes/sizes
affect properties of the composite

50
Q

What are composite types (according to filler size)?

A
  1. Macrofill
  2. Microfill
  3. Hybrid
  4. Nanofill
  5. Nanohybrid
50
Q

What are the characteristics of coupling agent?

A

Promotes adhesion (chemical) between the filler and resin matrix

51
Q

What are the characteristics of macrofill?

A

large particles
good fracture resistance
low shrinkage
poor wear resistance
poor polish

51
Q

What are some characteristics of microfill?

A

very small particles
fractures easily
more shrinkage
better wear resistance
polishable

52
Q

What are the characteristics of nanofill?

A

clusters of extremely small filler particles
glomerate to provide full range of filler sites

53
Q

What are the characteristics of hybrid?

A

combines the good properties of micro/macrofill

54
Q

What are some characteristics of nanohybrid?

A

incorporates the nanofill particles and integrates them with other sizes

55
Q

What are the composite types (according to the way it polymerizes)?

A
  1. Self-cure
  2. Light-cure
  3. Dual cure
55
Q

What are the composite types (clinical)?

A
  1. flowable
  2. packable
  3. fissure sealant
55
Q

What is polymerization shrinkage?

A

composite resin restorations shrink after curing

Operative (7 decks)

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