Lab 1

Question 1

T/F. The conservative class I restoration is indicated for small carious lesions that progress into dentin.

Answer 1

True.

Question 2

What is needed be considered a restoration?

Answer 2

the preparation must extend into dentin

Question 3

If the preparation does not extend into dentin, then it is a ___.

Answer 3

sealant

Question 4

What are the indications for conservative class I composites?

Answer 4

1. small, well-defined carious lesions
2. enamel defects
3. incipient lesions
4. suspected carious lesions

Question 5

What is the technique for doing a conservative class I composite?

Answer 5

1. LA
2. rubber dam
3. remove caries
4. remove debris (rinsing and drying)
5. etch (15 secs)
6. rinse (5 secs), dry tooth
7. bond (prepped AND un-prepped pits and fissures)
8. composite
9. sealant
10. check voids
11. remove rubber dam
12. occlusion
13. post-op instructions

Question 6

Dry tooth until the entire etched surface has a ___, ___ appearance.

Answer 6

dull; whitish

Question 7

T/F. Bond is only applied to the prepped pits and fissures.

Answer 7

False, apply it to prepped and unprepped pits and fissures

Question 8

Primary teeth have ___ enamel and dentin thickness than permanent teeth.

Answer 8

thinner

Question 9

T/F. the pulps of primary teeth are larger in relation to crown size than permanent pulps.

Answer 9

True.

Question 10

The ___ ___ of primary teeth are closer to the outer surface of the tooth than permanent pulps. The ___-___ pulp horn is the most prominent.

Answer 10

pulp horns; mesio-buccal

Question 11

In primary teeth, the enamel rods to the ___ third of the crown extend in an ___ direction from the DEJ.

Answer 11

gingival; occlusal

This is in contrast to the permanent dentition in which the rods extend in a cervical direction

Question 12

Primary teeth have ___, ___ proximal contacts.

Answer 12

broad, flat

Question 13

T/F. Primary teeth are whiter in color than their permanent successors.

Answer 13

True.

Question 14

Primary teeth have relatively ___ occlusal surfaces compared to their permanent successors.

Answer 14

narrow

Question 15

T/F. It is necessary to break contact at the buccal and lingual proximal line angles.

Answer 15

False, it is not necessary

Question 16

T/F. Three surface (MOD) restorations are preferred.

Answer 16

False, in primary teeth many practitioners limit class II composite restorations to relatively small TWO surface restorations.

Question 17

What is used because it is a more durable and predictable restoration for large and multisurface caries restorations?

Answer 17

stainless steel crowns

Question 18

T/F. Buccal or lingual retentive grooves should be placed in the proximal box.

Answer 18

False, NO buccal or lingual retentive grooves should be placed in the proximal box.

Question 19

The buccal and lingual walls should create a ___ degree angle with the enamel.

Answer 19

90

Question 20

The mesio-distal width of the gingival floor should be ___ mm, which is approximately equal to the width of a No. ___ bur.

Answer 20

1; 330

Question 21

The ___ margin should be placed out of stress-bearing areas, with no ___.

Answer 21

cavosurface; bevel

Question 22

The box should be __ of the intercuspal width, and the bucco-lingual walls should ___ slightly in an occlusal direction.

Answer 22

1/3rd; converge

Question 23

What are some common errors in class II composite preparations?

Answer 23

1. walls that don’t converge due to improper angulation of the bur
2. box too wide
3. box too deep, resulting in pulpal exposure
4. penetration of the tooth at the constriction

Question 24

Why are primary molars often penetrated at their constriction?

Answer 24

because of the prominent cervical bulge, increasing the depth of the gingival floor can result in this.