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Operative I > Week 2 Class I and V Preparations > Flashcards

Week 2 Class I and V Preparations Flashcards

1
Q

what are tools you can use for isolation

A

-rubber dam
- cotton rolls
- retraction cord
- isovac

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2
Q

how deep are ideal preparations into dentin

A

0.2-0.5 mm

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3
Q

what is the traditional teaching technique about the outline form of an amalgam preparation

A

the prep must not terminate in the bottom of a fissured pit or groove

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4
Q

where is contact broken on class II amalgams

A

facially and lingually

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5
Q

what is retention form

A

what retains the restoration

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6
Q

what is amalgam held in by

A

converging walls and/or retention grooves

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7
Q

what is resistance form

A

elements in the design of a tooth prep that will help restoration and tooth resist fracturing

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8
Q

what makes a restored tooth less likely to fracture

A
  • maintaining as much tooth structure as possible
  • having some areas on the floor of a multi surface preparation that are perpendicular to occlusal forces
  • rounding internal line angles
  • smoothly rounding outline form
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9
Q

what factors are important to keep in mind when preparing to proper depth

A

-never leave enamel on the floor of a prep
- never leave a partial depth ledge on the enamel wall of an occlusal prep

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10
Q

where is a buccal pit amalgam class 1 located

A

in occlusal 2/3 of molar tooth

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11
Q

what depth should a buccal pit class 1 be

A

1.8 mm

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12
Q

how much do walls at the terminal ends of buccal and lingual grooves in a class 1 diverge

A

3 degrees

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13
Q

how much do walls in the isthmus area converge

A

3 degrees on each side

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14
Q

how big is the isthmus width on a class 1 prep

A

1 mm minumum

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15
Q

how much do walls adjacent to marginal ridges diverse

A

3 degrees

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16
Q

why diverge the mesial/ distal wall adjacent to the marginal ridge

A

leaves dentin support for the ridge in this area

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17
Q

what should the occlusal amalgam depth be in relation to DEJ

A

.2 mm inside DEJ

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18
Q

what should the occlusal amalgam depth of plastic molars be? premolars?

A

molars: 2 mm total
premolars: 1.5-2 mm total

19
Q

what would be the risk of converging walls adjacent to the marginal ridges on a class 1

A

destruction of the dentin support for the marginal ridge

20
Q

which direction M/D does the bur incline more in the mandible? maxilla?

A

mandible: mesially
maxillar: distally

21
Q

why does the bur incline differently M/D in each arch

A

curve of spee

22
Q

what direction (B/L) does the bur incline more in the mandible? maxilla?

A

mandible: lingually
maxilla: buccally

23
Q

why does the bur incline differently B/L in each arch

A

curve of wilson

24
Q

how deep should the prep be for a class 1 occlusal amalgam prep

A

1.5 mm

25
Q

what walls does a 330 bur give you? 169?

A

330: converging
169- diverging

26
Q

how long is the 169 bur

A

4 mm

27
Q

what type of bur is a 169

A

tapered fissure bur

28
Q

how long is a 330 bur

A

1.8 mm

29
Q

at 1.5 mm depth prep on occlusal surface of molar have you reached the dentin

A

NO

30
Q

what type of bur is a 245 bur and how long is it

A

-inverted cone bur
- 3 mm

31
Q

what will a 245 bur do if held in one plane

A

can an undercut prep with rounded internal line angles

32
Q

what will a 169 bur do to line angles

A

make them sharp

33
Q

what should the walls look like on a class I occlusal amalgam prep

A

diverge

34
Q

what is a class V

A

gingival 3rd of the buccal and lingual surfaces of teeth

35
Q

where do almost all carries start

A

supragingivally

36
Q

what is the outline form determined by in a class V amalgam prep

A

the extent of the caries rather than the anatomy

37
Q

what degree and angle do the margins in a class V amalgam prep need to be

A

90 degrees, diverging

38
Q

how deep should the class V buccal amalgam prep be

A

1.5 mm

39
Q

what burs should you use for the class V buccal amalgam prep

A

-#2 round bur on slow speed to excavate caries
- #169 at high speed to refine internal line angles and cavosurface margins

40
Q

how deep do you drill when there is minimal thickness of enaml in a class V buccal amalgam prep

A

1 mm

41
Q

how deep do you drill when the margin is on the root in a class V buccal amalgam prep

A

0.75 mm

42
Q

where is the retention groove and what bur do you use for a class 5 amalgam prep

A

entirely in dentin just inside the DEJ, use a 1/4 round bur

43
Q

where do retention grooves go inside deep preps

A

still go just inside the DEJ

44
Q

how do you remove caries that extend into the interproximal embrasures

A

-excavate caries with #2 round bur
- use a gingival margin trimmer to remove undermined enamel interproximally
- use end of 169 bur to define internal line angles interproximally

Operative I (12 decks)

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