CVC Prep (22) Flashcards Preview

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Flashcards in CVC Prep (22) Deck (24)
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1
Q

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

A

28-#31

2
Q

What bur should be used for occlusal guide grooves?

A

L-242.6M on high speed

3
Q

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

A

0.2mm shallower

4
Q

Where should occlusal depth orientation grooves be placed?

A

Triangular cusp ridges

Grooves

5
Q

What bur should be used for occlusal reduction?

A

L-242.6M on high speed

6
Q

What should the planes of occlusal reduction correspond to?

A

Anatomical features of the unprepared tooth

7
Q

What should the functional cusp bevel angulation be?

A

45 degrees to the long axis of the tooth

8
Q

What bur should be used for the axial guide grooves?

A

L-242.6M on high speed

9
Q

What do axial guide grooves determine?

A

The eventual POW

10
Q

How far should the chamfer be from the gingiva?

A

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

11
Q

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

A

0.5mm

12
Q

What will happen if there is excessive taper?

A

Dramatically reduce the retention and resistance of the prep

13
Q

Functional cusp reduction measurements

A
  1. 5mm

1. 3-1.7mm

14
Q

Central groove reduction measurement

A
  1. 0mm

0. 8-1.2mm

15
Q

Non-functional cusp reduction

A
  1. 0mm

0. 8-1.2mm

16
Q

POW measurement

A

+/- 5 degrees

17
Q

Convergence angle measurement

A

6 degrees

2-10 degrees

18
Q

Chamfer width measurement

A
  1. 5mm

0. 4-0.7mm

19
Q

Interproximal chamfer width measurement

A
  1. 5mm

0. 3-0.7mm

20
Q

Lingual-Occlusal line angle reduction measurement

A
  1. 8mm

0. 6-1.0mm

21
Q

What is a major difference between maxillary and mandibular preps?

A

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

22
Q

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

A

It establishes the POW

23
Q

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

A

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

24
Q

Maxillary buccal second plane measurement

A
  1. 0mm

0. 8-1.0mm