CVC Prep (22)

Question 1

For a prep on #30, what teeth should the putty impression cover?

Answer 1

28-#31

Question 2

What bur should be used for occlusal guide grooves?

Answer 2

L-242.6M on high speed

Question 3

What should be the depth difference between orientation grooves and final prep?

Answer 3

0.2mm shallower

Question 4

Where should occlusal depth orientation grooves be placed?

Answer 4

Triangular cusp ridges

Grooves

Question 5

What bur should be used for occlusal reduction?

Answer 5

L-242.6M on high speed

Question 6

What should the planes of occlusal reduction correspond to?

Answer 6

Anatomical features of the unprepared tooth

Question 7

What should the functional cusp bevel angulation be?

Answer 7

45 degrees to the long axis of the tooth

Question 8

What bur should be used for the axial guide grooves?

Answer 8

L-242.6M on high speed

Question 9

What do axial guide grooves determine?

Answer 9

The eventual POW

Question 10

How far should the chamfer be from the gingiva?

Answer 10

0.5mm or 1.0mm coronal to CEJ (whichever is more coronal)

This gives enough space to ensure periodontal health while providing sufficient length for resistance and retention

Question 11

How much clearance should there be from the prep to the adjacent tooth?

Answer 11

0.5mm

Question 12

What will happen if there is excessive taper?

Answer 12

Dramatically reduce the retention and resistance of the prep

Question 13

Functional cusp reduction measurements

Answer 13

1. 5mm

1. 3-1.7mm

Question 14

Central groove reduction measurement

Answer 14

1. 0mm

0. 8-1.2mm

Question 15

Non-functional cusp reduction

Answer 15

1. 0mm

0. 8-1.2mm

Question 16

POW measurement

Answer 16

+/- 5 degrees

Question 17

Convergence angle measurement

Answer 17

6 degrees

2-10 degrees

Question 18

Chamfer width measurement

Answer 18

0. 5mm

0. 4-0.7mm

Question 19

Interproximal chamfer width measurement

Answer 19

0. 5mm

0. 3-0.7mm

Question 20

Lingual-Occlusal line angle reduction measurement

Answer 20

0. 8mm

0. 6-1.0mm

Question 21

What is a major difference between maxillary and mandibular preps?

Answer 21

Maxillary preps require a second plane of reduction on the buccal surface
1st - gingival crest to jnxn of and occlusal thirds
2nd - jnxn of middle and occlusal thirds to occlusal edge

Question 22

What is the purpose of the first buccal plane on a maxillary prep?

Answer 22

It establishes the POW

Question 23

What is the purpose of the second buccal plane on a maxillary prep?

Answer 23

Provides sufficient space for the restoration metal and restores the tooth to its original contour

Question 24

Maxillary buccal second plane measurement

Answer 24

1. 0mm

0. 8-1.0mm