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Operative > Class I,V, and Buccal pit amalgam preparations > Flashcards

Class I,V, and Buccal pit amalgam preparations Flashcards

1
Q

____ is an alloy of silver, copper, tin, and zinc mixed with mercury to form an alloy that can be packed into a dental preparation, and which will set up to form a solid restoration

A

Amalgam

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2
Q

Amalgam has ____ compressive strength and ____ tensile strength which means it is brittle in small bulk

A

High compressive strength; low tensile strength

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3
Q

Amalgam is _____ to moisture contamination during placement. Water reacts with the zinc in the amalgam and causes an eventual expansion of the alloy out of the prep

A

sensitive to moisture contamination

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4
Q

T/F: You can scrape off the top contaminated layer of an amalgam and keep packing the amalgam

A

True

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5
Q

Does amalgam corrode?

A

Yes

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6
Q

What does modern alloys have in them to minimize the corrosion?

A

High Copper content

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7
Q

Amalgam creates and ______ a seal between itself and the tooth because of the oxides formed; they expand and fill tiny voids and prevent microleakage

A

regenerates

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8
Q

Poor esthetics, need for good mercury hygiene, need for full depth tooth prep due to weakness in small bulk, doesn’t bond to tooth structure, thermal conductor making necessary the use of a liner or base to prevent post-op sensitivity, may ditch at the margins collecting plaque are disadvantages of ____

A

Amalgam

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9
Q

Less difficult to use in area where moisture is hard to control, high wear resistance and compressive strength, can be placed in less time than other options, cost less, long-lasting, regenerates its seal, less prone to recurrent decay than bonded composite resin restorations are advantages of _____

A

amalgam

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10
Q

Does there need to be a means for isolation for amalgams?

A

Yes

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11
Q

What are the 3 things that you gain from isolation during an amalgam restoration?

A

Visibility, access, and moisture control

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12
Q

____ attaches to high speed evacuation line, retracts tongue; has a disposable flexible vinyl component with a reusable valve adapter

A

Isolite/Isovac system

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13
Q

All _____ enamel must be removed from all margins

A

Undermined

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14
Q

Should there ever be acute angles on the tooth?

A

No

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15
Q

How deep should preps be for amalgams and into what layer of tooth?

A

.2 to .5 thru the enamel to dentin

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16
Q

____ is a term that refers to what holds a restoration in a tooth; amalgams don’t bond to tooth structure

A

Retention Form

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17
Q

How are smaller amalgams held in place?

A

Converging walls or retention grooves

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18
Q

_____ is a term that refers to element in the design that will help both restoration and tooth resist fracturing

A

Resistance Form

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19
Q

Does maintaining tooth structure preserve resistance form?

A

Yes

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20
Q

Having some areas on the floor of a multi-surface preparation that are perpendicular to occlusal forces make the RESTORATION _____ likely to fracture

A

less

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21
Q

____ internal line angles on a preparation (at least a little bit) make the TOOTHless likely to fracture.

A

Rounding

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22
Q

Smoothly _____ outline forms make the RESTORATION less likely to fracture.

A

rounding

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23
Q

Is a buccal pit restoration a class I or V?

A

Class I

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24
Q

_____ is a class I restoration because it occurs in the occlusal 2/3 of a molar tooth and it restores a development pit

A

Buccal pit amalgam

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25
Q

All walls of the buccal pit prep _____ except the apex of the triangular form

A

Converge

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26
Q

Which wall of the buccal pit prep is not converged?

A

Occlusal-most wall of prep

27
Q

Which bur is recommended for the buccal pit prep?

A

330

28
Q

How deep is the 330 bur?

A

1.5 mm

29
Q

Should the walls of the isthmus be diverged or converged?

A

Converged

30
Q

Should the marginal ridges and buccal and lingual walls be diverged or converged?

A

Diverged

31
Q

Converging the walls of the marginal ridges results in ____

A

No dentin support

32
Q

What is the occlusal amalgam depth for molars to get approximately .2mm into the dentin?

A

2 mm

33
Q

What is the occlusal amalgam depth for premolars to get approximately .2mm into the dentin?

A

1.5-2mm

34
Q

Bur inclines more _____ in the mandible due to the curve of spee

A

mesially

35
Q

Bur inclines more ____ in the maxillary due to the curve of spee

A

distally

36
Q

Bur inclines more _____ in the mandible due to curve of wilson

A

Lingually

37
Q

Bur inclines more ____ in the maxillary due to curve of wilson

A

Buccally

38
Q

What bur should the outline of the tooth be made with and dovetail the marginal ridges and diverge walls of buccal and lingual walls in the Class I 18 amalgam prep?

A

169

39
Q

What bur should be used to go to correct depth and widen the isthmuses in Class I 18 amalgam prep?

A

330 or 245

40
Q

What width should the isthmuses of the prep forClass I amalgam 18 prep be?

A

1 mm

41
Q

____ amalgam prep Restores caries on the gingival 3rd of the buccal and lingual surfaces of teeth.

A

Class V amalgam prep

42
Q

Almost all caries starts _____, but often spreads subgin-givallyonto the root surface.

A

supragingivally

43
Q

All walls in the Class V amalgam prep ______

A

Diverge

44
Q

____ are used to retain the class V amalgam restoration

A

Retention grooves

45
Q

T/F: The entire thickness of the enamel is perpendicular to the cavosurface and is still supported internally by dentin

A

True

46
Q

How deep should one go with class V amalgam prep?

A

1.5 mm

47
Q

What bur should be used in a class V amalgam prep?

A

169

48
Q

In the real world, what should be used in a class V amalgam prep to excavate caries?

A

2 round bur on slow speed

49
Q

What bur is used to put the retention grooves in the class V amalgam prep?

A

1/4 round bur

50
Q

What tool should be used when caries go into the interproximal embrasures to remove undermined enamel?

A

Gingival margin trimmer

51
Q

What bur should the outline of the tooth be made with and dovetail the marginal ridges and diverge walls of buccal and lingual walls in the Class I 18 amalgam prep?

A

169

52
Q

What bur should be used to go to correct depth and widen the isthmuses in Class I 18 amalgam prep?

A

330 or 245

53
Q

What width should the isthmuses of the prep forClass I amalgam 18 prep be?

A

1 mm

54
Q

____ amalgam prep Restores caries on the gingival 3rd of the buccal and lingual surfaces of teeth.

A

Class V amalgam prep

55
Q

Almost all caries starts _____, but often spreads subgin-givallyonto the root surface.

A

supragingivally

56
Q

All walls in the Class V amalgam prep ______

A

Diverge

57
Q

____ are used to retain the class V amalgam restoration

A

Retention grooves

58
Q

T/F: The entire thickness of the enamel is perpen-dicularto the cavo-surface and is still supported internally by dentin

A

True

59
Q

How deep should one go with class V amalgam prep?

A

1.5 mm

60
Q

What bur should be used in a class V amalgam prep?

A

169

61
Q

In the real world, what should be used in a class V amalgam prep to excavate caries?

A

2 round bur on slow speed

62
Q

What bur is used to put the retnetion grooves in the class V amalgam prep?

A

1/4 round bur

63
Q

What tool should be used when caries go into the interproximal embrasures to remove undermined enamel?

A

Gingival margin trimmer

Operative (12 decks)

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