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Operative Dentistry I > Class I & V Preparation Fundamentals > Flashcards

Class I & V Preparation Fundamentals Flashcards

1
Q

Principles of tooth preparation for amalgam restorations include: (3)

A
  1. Visibility
  2. Access
  3. Moisture control
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2
Q

When doing an amalgam restoration, have a means for _____ of the site

A

Isolation

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3
Q

Modes of isolation include:

A
  1. Rubber dam (gold standard)
  2. Cotton rolls
  3. Retraction cord
  4. Isovac
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4
Q

Principles: Treatment of tooth structure-

All _____ must be removed from all margins

A

Undermined enamel

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5
Q

Enamel that is not supported by dentin underneath it:

A

Undermined enamel

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6
Q

_____ must support all surface enamel:

A

Dentin

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7
Q

Margins should be ____ at the cavosurface of all axial surfaves:

A

90 degrees

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8
Q

On the occlusal surface, margins may be _____ in some areas, but must NEVER BE ____ anywhere on the tooth

A

Slightly obtuse; Acute

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9
Q

What would occur if the margins of the cavosurface were acute?

A

Enamel would break

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10
Q

Ideal preparations are _____ to _____ into the dentin

A

0.2mm to 0.5mm

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11
Q

Ideal preparations must be prepared through the:

A

ENTIRE enamel layer

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12
Q

In a live patient the depth of an ideal preparation into the dentin is determined by:

A

Caries

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13
Q

The tradition teaching about the outline form of an amalgam preparation states that the preparation must NOT terminate in:

A

The bottom of a FISSURED pit or groove

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14
Q

On class II amalgams, contact is broken:

A

Facially & lingually

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15
Q

Preparations should encompass all carious & badly demineralized areas, this is called:

A

Extension for prevention

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16
Q

Term that refers to what holds a restoration in a tooth:

A

Retention form

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17
Q

Does amalgam bond to tooth structure?

A

no

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18
Q

Smaller amalgams are held in by ______ and/or ______ if no walls can converge

A

Convering walls; Retention grooves

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19
Q

Elements in the design of a tooth preparation that will help both restoration & tooth resist fracturing:

A

Resistance form

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20
Q

Maintaining as much tooth structure as possible makes the tooth:

A

Less likely to fracture

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21
Q

Having some areas on the floor of a multi-surface preparation that are _____ to the ____ make the restoration less likely to fracture

A

Perpendicular; occlusal forces

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22
Q

______ the internal line angles on a preparation (at least a little bit) make the tooth less likely to fracture

A

Rounding

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23
Q

Smoothly rounding the outline form makes the ____ less likely to fracture

A

Restoration

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24
Q

Preparing to _______ prevents weakness (resists fracture) in the restoration

A

Proper depth

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25
Q

Never leave ____ on the floor of a preparation

A

Enamel

26
Q

Never leave a _____ on an enamel wall of an occlusal preparation, like a class I amalgam

A

Partial-depth ledge

27
Q

Avoid leaving ____ under an amalgam that is subject to occlusal stress

A

Sharp external line angles

28
Q

A buccal pit amalgam preparation can be classified as a:

A

Class I

29
Q

A class I buccal pit amalgam occurs in the ______ tooth

A

Occlusal 2/3 of molar

30
Q

A class I buccal pit amalgam restores a:

A

Developmental pit

31
Q

Despite being on the axial surface, a buccal pit amalgam is NOT a:

A

Class V

32
Q

For a buccal pit preparation, use the ____ bur. Its flutes are ____ top-to-bottom, so they area gauge for proper depth.

A

330; 1.5mm

33
Q

The 330 bur is a ______ shape, so it will naturally ______

A

Inverted cone; converge walls

34
Q

Describe whether the following should be converging or diverging:

  1. Buccal walls in isthmus area:
  2. Lingual walls in isthmus area:
  3. Distal wall:
  4. Lingual wall at lingual groove:
  5. Mesial wall:
  6. Wall at buccal groove:
A
  1. Converging
  2. Converging
  3. Diverging
  4. Diverging
  5. Diverging
  6. Diverging
35
Q

Walls at the terminal ends of buccal & lingual groove should diverge ____ degrees

A

3 degrees

36
Q

Walls in the isthmus area converge ____ degrees on each side of the preparation, & isthmus width is ____ minimum

A

3; 1mm

37
Q

Walls adjacent to marginal ridges ____ by ___ degrees

A

Diverge; 3 degrees

38
Q

Diverging the mesial or distal wall adjacent to the marginal ridge leaves ______ for the ridge in this area

A

Dentin support

39
Q

Occlusal amalgam depth:

A

0.2mm inside the DEJ

40
Q

Converging the wall adjacent to the marginal ridge risks _____ for the marginal ridge

A

Risks destruction of the dentin support

41
Q

How can you avoid off-axis preparation?

A

Enter teeth parallel to the long axis of the crown, not the patien

42
Q

Bur inclines more mesially in the ____ & more distally in the ____ the further posteriorly we go due to the ____-

A

mandible; maxilla; curve of spee

43
Q

Bur inclines more lingually in the ____ and more buccally in the ____ the more posteriorly we go, due to the _____

A

mandible; maxilla; curve of wilson

44
Q

If the preparation is still in the enamel it is:

A

Too shallow

45
Q

Angular outline form could cause:

A

Areas of stress concentration

46
Q

The 169 bur will give a slightly _______ prep since it is a _____ shaped bur

A

diverging; tapered fissure bur

47
Q

The 169 bur flute measures _____ top-to-bottom

A

4 mm

48
Q

Shape & depth of a 245 bur:

A

Inverted cone bur, with rounded edges on its flat end; 3mm

49
Q

Restores caries on the gingival 3rd of the buccal and lingual surfaces of the teeth:

A

Class V preparation

50
Q

Almost all caries starts _____ but often spreads ____ onto the root surface:

A

Supragingivally; subgingivally

51
Q

In class V amalgam preparation, the axial wall is _____, and a _____ should be present

A

Convex; gingival retention groove

52
Q

A gingival retention groove in a class V amalgam preparation is located:

A

In the dentin, just inside the DEJ

53
Q

Enamel in the cervical is _____ compared to the occlusal area

A

thinner

54
Q

In a class v preparation, since the prep is in a smooth area, the outline form is determined by ____

A

Extent of the caries (rather than following the anatomy)

55
Q

In a class V amalgam preparation, since the prep is in a convex surface and all amalgam margins must be 90 degrees; all walls _____ & _____ are need for retention

A

Diverge; grooves

56
Q

In a class V amalgam preparation, the axial wall is ____ when caries is minimal

A

Convex

57
Q

When caries extend on the root surface/subgingival the rules for ____ may change

A

Depth

58
Q

When caries extend onto the root surface/subgingival, the rules for depth may change:

A) when there is a minimum thickness of enamel:
B) When the margin is on the root:

A

A) 1mm depth
B) 0.75mm depth

59
Q

Describe the placement of a retention groove in a class v buccal amalgam restoration:

What if is is in an extremely deep prep:

A

Entirely in dentin, just inside DEJ

The grooves still go just inside the DEJ

60
Q

What is used to remove undermined enamel interproximally?

A

Gingival margin trimmer

Operative Dentistry I (6 decks)

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