Class II Prep

Question 1

Caries entirely in the enamel

Answer 1

Initial caries

Question 2

Carious lesion that enters the dentin:

Answer 2

Moderate caries

Question 3

Caries that are well into the dentin, approaching the pulp

Answer 3

Advanced caries

Question 4

Carious lesion entering the dentin of the root

Answer 4

Root caries

Question 5

In interproximal caries, the caries location in relation to the contact

Answer 5

Below the contact

Question 6

What are the Dentist’s goal in restoration of interproximal caries: (5)

Answer 6

1. Remove carious tooth structure
2. Remove the least amount of tooth structure as possible
3. Restoration resists fracture (resistance form)
4. Retains the restorations (retention form

Question 7

Label the following parts of a class II Amalgam preparation

Question 8

Label the following features of a class II preparation:

Answer 8

1- pulpal floor
2- Axiopulpal line (angle bevel)
3- Buccal wall (3-4 degrees convergence)
4- Retention groove
5- Gingival floor
6- Lingual wall (3-4 degrees convergence)
7- Axial wall

Question 9

Label the following aspect of a class II preparation:

Answer 9

1- Reverse S curve
2- Buccal wall of box
3- Axiopulpal line angle bevel
4- Gingival floor of box
5- Lingual wall of box
6- Isthmus
7- Isthmus
8- Isthmus
9- Dovetail

Question 10

Label what A & B represent and the angles of convergence necessary at each:

Answer 10

A- Lingual wall: 3-4 degrees convergence
B- Buccal wall: 3-4 degrees of convergence

Question 11

• Label what (A) is representing
• Should (A) be concave or convex
• What degrees should (A) be
• Label what (B) is representing
• What degrees should (B) be & where

Answer 11

A- Axiopulpal line angle bevel
- 45 degrees
- Convex

B- Lingual wall of Box
- 90 degrees at Cavosurfaave

Question 12

In a class II amalgam preparation, the Reverse S curve is nearly always on the _____ side of the preparation:

Answer 12

Buccal

Question 13

What does the reverse S curve do in a class II amalgam preparation?

Answer 13

1. Creates smooth rounded form
2. Improves resistance to amalgam fracture
3. Keeps narrowest part of preparation away from Axiopulpal line angle
4. Allows preparation t break contact while allowing the buccal wall to meet the tooth surface at a 90 degree exit angle

Question 14

Allows preparation to break contact while allowing the buccal wall to meet the tooth surface at a 90 degree exit angle:

(In a class II amalgam preparation)

Answer 14

Reverse S curve

Question 15

In a class II amalgam preparation, the reverse S curve allows preparation to break contact while allowing the buccal wall to meet the tooth surface at a ______ exit angle

Answer 15

90 degree