Caries Classification and Class I Preps

Question 1

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)

Answer 1

Pit and fissure carries

Question 2

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

Answer 2

Smooth surface caries

Question 3

Caries occurring more in elderly, follows advanced gingival recession

Answer 3

Root surface caries

Question 4

Incipient, Small, Moderate, and Extensive classify _______.

Answer 4

Stage of caries

Question 5

Where do recurrent/secondary caries occur?

Answer 5

Under a preexisting restoration.

Question 6

G.V. Black

Answer 6

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

Question 7

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.

Answer 7

Class I

Question 8

Caries classification:

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

Answer 8

Class II

Question 9

Caries classification:

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

Answer 9

Class III

Question 10

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

Answer 10

Class IV

Question 11

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

Answer 11

Class V

Question 12

Caries classification:

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

Answer 12

Class VI

Question 13

Fundamental concepts for all tooth preparations:

Answer 13

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

Question 14

Healthy state is reestablishing…

Answer 14

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

Question 15

Isthmus in a class I

Answer 15

narrowest portion of a cavity preparation

Question 16

Isthmus in a class II

Answer 16

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

Question 17

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

Answer 17

marginal fossa, developmental grooves

Question 18

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

Answer 18

Cavosurface margin

Question 19

Basic 6 Principles of Cavity Preparation

Answer 19

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

Question 20

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

Answer 20

Outline form

Question 21

Factors governing outline form

Answer 21

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

Question 22

Conservative approach to outline form

Answer 22

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

Question 23

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.

Answer 23

Resistance form

Question 24

Primary resistance factors

Answer 24

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

Question 25

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

Answer 25

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

Question 26

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

Answer 26

1.5mm

Question 27

Amalgam has a _____ edge strength

Answer 27

low (so amalgam margin is of importance)

Question 28

Desired cavosurface margin (Butt-joint Margin) for amalgam

Answer 28

90 degrees

Question 29

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

Answer 29

Retention form

Question 30

How is retention form achieved?

Answer 30

Making opposing walls parallel or slightly convergent towards occlusal

Question 31

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

Answer 31

Convenience form

Question 32

Minimal diameter of any spot in a cavity

Answer 32

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

Question 33

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

Answer 33

finishing

Question 34

purpose of finishing the margin

Answer 34

to achieve the best marginal seal

Question 35

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

Answer 35

Debridement

Question 36

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

Answer 36

0.5 mm

Question 37

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

Answer 37

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

Question 38

Isthmus width should not exceed ___ intercuspal distance

Answer 38

1/3 (but preferably 1/4 max)

Question 39

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

Answer 39

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

Question 40

Correct depth of the cavity preparation

Answer 40

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

Question 41

Dimensions of 330 bur

Answer 41

0.8mm diameter and 1.5mm depth

Question 42

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

Answer 42

1.6mm

Question 43

Pulpal floor should be ______ to long axis of tooth

Answer 43

perpendicular

Question 44

Adequate depth insures proper _______ form

Answer 44

Resistance (allows amalgam to withstand opposing forces)

Question 45

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

Answer 45

1.0-1.2mm

Question 46

Axial depth of an extension

Answer 46

1.0-1.2mm