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operative dentistry > Class I & V Preparation Fundamentals > Flashcards

Class I & V Preparation Fundamentals Flashcards

1
Q

Principles of tooth preparation for amalgam restorations include:

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 on all axial surfaces

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; never be acute

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9
Q

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

A

enamel would break

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10
Q

Ideal preparations are ____ to ____ into the dentin:

A

0.2mm-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 traditional 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 and lingually

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15
Q

Preparations should encompass all carious and 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 heading by ____ and/or _____ if no walls can converge

A

converging walls and/or retention grooves

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19
Q

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

A

resistance form

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20
Q

Retaining as much tooth structure as possible makes the 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

_____ 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

Smoothing 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 the 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 can be classified as:

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 axial surface, a buccal pit amalgam is NOT a:

A

class V

32
Q

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

A

330; 1.5mm

33
Q

The 330 bur is a ____ shape so it 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 of 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 the buccal and lingual grooves should diverge ____ degrees

A

3

36
Q

Walls in the isthmus areas converge ___ degrees on each side of the preparation, isthmus width is ___ minimum

A

3 degrees; 1 mm

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

.3 mm inside the DEJ

40
Q

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

A

destruction of the dentin support

41
Q

How can you avoid an off-axis preparation?

A

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

42
Q

Bur inclines more medially in the ____ and more distal in the ___ the further posterior we go, do to the ___

A

mandible; maxilla; curve of Spee

43
Q

Bur inclines more lingually in the ____ and more bucally 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

47
Q

The #169 bur flute measures ____ top to bottom

A

4mm

48
Q

Shape and depth of 245 bur:

A

inverted cone w/ rounded edges on its flat end; 3mm

49
Q

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

A

Class V preparation

50
Q

Almost all caries start ___, but often spreads ___ onto the root surface

A

supragingivally; subgingivally

51
Q

In a 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 on the cervical area is ____ compared to the occlusal area

A

thinner

54
Q

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

A

extent of caries (rather than following anatomy)

55
Q

In a class V amalgam prep, since the prep is in a convex surface and all amalgam margins must be 90 degree; all walls ____ and ____ are needed for retention.

A

diverge; grooves

56
Q

In a class V amalgam prep, the axial wall is ___ when caries is minimal

A

convex

57
Q

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

A

depth

58
Q

When caries extend on to the root surface/subgingival the rules for depth may change:

A- When there is a minimum thickness of enamel:
B- When 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 prep:

What if its an extremely deep prep?

A

Entirely in dentin just inside DEJ

the groove still go just inside the DEJ

60
Q

What is used to remove undermined enamel inter proximally?

A

gingival margin trimmer

operative dentistry (5 decks)

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