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AU14 - Operative > Caries Classification and Class I Preps > Flashcards

Caries Classification and Class I Preps Flashcards

1
Q

Caries occurring in pits and fissures on the occlusal surfaces of posterior teeth, buccal and lingual surfaces of molars, lingual surfaces of maxillary anterior teeth (general)

A

Pit and fissure carries

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2
Q

Caries occurring on the surfaces that are “pit and fissure free”

A

Smooth surface caries

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3
Q

Caries occurring more in elderly, follows advanced gingival recession

A

Root surface caries

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4
Q

Incipient, Small, Moderate, and Extensive classify _______.

A

Stage of caries

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5
Q

Where do recurrent/secondary caries occur?

A

Under a preexisting restoration.

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6
Q

G.V. Black

A

Create of one type of cavity classification system; said the location of the lesion dictated the design of the cavity preparation.

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7
Q

Caries classification:
Pits and fissures of: occlusal surfaces of premolars and molars; buccal or lingual pits/fissure of the molars; lingual pit near the cingulum of the maxillary incisors.

A

Class I

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8
Q

Caries classification:

Involving the proximal surfaces (mesial and distal) of premolars and molars

A

Class II

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9
Q

Caries classification:

Proximal (mesial and distal) surfaces of incisors and canines.

A

Class III

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10
Q

Caries classification:
Proximal surfaces of incisors and canines, but also will involve the incisal
edge

A

Class IV

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11
Q 
Caries classification:  
gingival third (the area near the gingiva) of the facial or lingual surfaces of any tooth
A

Class V

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12
Q

Caries classification:

Involve the incisal edges of anterior teeth and the cusp tips of posterior teeth. Carious lesions are rare.

A

Class VI

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13
Q

Fundamental concepts for all tooth preparations:

A

1- Removal of dental caries
2- Removal of weak tooth structure to provide well supported sound hard tissue
3- Pulp protection

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14
Q

Healthy state is reestablishing…

A
  • Tooth is not diseased anymore
  • Normal function and form
  • Esthetically pleasing where indicated (anterior zone of the oral cavity)
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15
Q

Isthmus in a class I

A

narrowest portion of a cavity preparation

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16
Q

Isthmus in a class II

A

a portion of the cavity connecting an occlusal portion and a proximal portion together

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17
Q

Dovetail design includes each _______ and the ______ around the marginal pits

A

marginal fossa, developmental grooves

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18
Q

Junction between the external walls of the cavity preparation and the uncut tooth surface.

A

Cavosurface margin

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19
Q

Basic 6 Principles of Cavity Preparation

A
  1. Outline form
  2. Resistance form
  3. Retention form
  4. Convenience form
  5. Finishing
  6. Debridement
20
Q

The shape of the cavity preparation; perimeter of the tooth preparation in
width, length and depth

A

Outline form

21
Q

Factors governing outline form

A
  • Conservation of tooth structure
  • Location and the extent of the carious lesion
  • Position of pit and fissure dictate the outline
22
Q

Conservative approach to outline form

A

remove minimal amount of tooth (while still removing entire carious area and any weak enamel, e.g. no unsupported enamel)

23
Q

Design features of cavity preparation
allowing the remaining tooth structure & the restoration to withstand
forces that are principally directed towards the long axis of the tooth.

A

Resistance form

24
Q

Primary resistance factors

A

1-Removal of undermined surface enamel
2-Flat pulpal floor and Cavity wall angulation
3- Cavity preparation depth
4- Well defined rounded Internal line angles
5- Type of restorative material

25
Q

Why have a box shaped cavity instead of a cup shaped cavity?

A

Helps with resistance form – cup shaped cavity would allow micro-movement of restoration in a wedging effect on the supporting dentin bridge

26
Q

Minimum amalgam thickness to withstand forces (help with resistance form)

A

1.5mm

27
Q

Amalgam has a _____ edge strength

A

low (so amalgam margin is of importance)

28
Q

Desired cavosurface margin (Butt-joint Margin) for amalgam

A

90 degrees

29
Q

Design features of the cavity preparation that prevent dislodgement of the restoration by lifting or tipping forces

A

Retention form

30
Q

How is retention form achieved?

A

Making opposing walls parallel or slightly convergent towards occlusal

31
Q

Sufficient access to the cavity, to facilitate visibility and instrumentation of the cavity preparation and the insertion of the restorative material.

A

Convenience form

32
Q

Minimal diameter of any spot in a cavity

A

1.0mm so that the small end of the smallest condenser can fit

33
Q

Finishing the cavosurface margin (enamel margin) to prevent jagged or rough outline

A

finishing

34
Q

purpose of finishing the margin

A

to achieve the best marginal seal

35
Q

Final step before restoring; rinsing the cavity with air/water spray and high suction evacuation

A

Debridement

36
Q

Two cavities should not be united unless the separating ridge is less than ______

A

0.5 mm

37
Q

Teeth with ridges that should not be prepped through unless decay is present on ridges

A

Maxillary molars (with oblique ridge) and Mandibular 1st premolars (with transverse ridge)

38
Q

Isthmus width should not exceed ___ intercuspal distance

A

1/3 (but preferably 1/4 max)

39
Q

Enamel rod direction in central, middle, and peripheral 1/3s away from long axis of tooth

A

central 1/3 = rods lean towards axis
middle 1/3 = parallel to long axis
peripheral 1/3 = away from long axis

40
Q

Correct depth of the cavity preparation

A

0.2-0.5mm into dentin (1.5-2.0mm on ivorine teeth)

41
Q

Dimensions of 330 bur

A

0.8mm diameter and 1.5mm depth

42
Q

___mm of tooth structure should be left between cavosurface margin and proximal contact area to conserve marginal ridge

A

1.6mm

43
Q

Pulpal floor should be ______ to long axis of tooth

A

perpendicular

44
Q

Adequate depth insures proper _______ form

A

Resistance (allows amalgam to withstand opposing forces)

45
Q

Proper isthmus measurement of a Class I prep on the ivorine teeth

A

1.0-1.2mm

46
Q

Axial depth of an extension

A

1.0-1.2mm

AU14 - Operative (5 decks)

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