Principles Of CVC Preps

Question 1

The replacement and restoration of teeth by artificial substitutes that are not readily removable from the mouth

Answer 1

Fixed Prosthodontics

Question 2

A cast-gold extracoronal restoration which covers the clinical crown

Answer 2

CVC (Complete Veneer Crown)

Question 3

Indications for Single Crown:

Answer 3

1. Extensive Coronal Destruction
2. Short clinical crowns
3. Endodontically treated teeth
4. Maximum retention and resistance needed
5. Correction of axial contours

Question 4

Contraindications for single crown:

Answer 4

1. Wherever an intact buccal or lingual wall exists
2. If less than maximum retention and resistance are needed
3. If objectives can be met with a more conservative restoration

Question 5

Pros and Cons of CVC crown

Answer 5

Pros: Better retention and resistance, modifiable tooth contour

Cons: Removal of large amount of tooth, adverse effects on tissue, esthetics (metal), vitality testing not feasible

Question 6

The terminal portion of the prepared tooth

Answer 6

Finish line

Question 7

A finish line design for a tooth preparation in which the gingival aspect meets the external axial surface at an obtuse angle

Answer 7

Chamfer

Question 8

Alignment of long axis of a tooth to a selected plane, often the horizontal plane

Answer 8

Axial Inclination

Question 9

The long axis is determined clinically by bisecting the angle formed by opposing axial surfaces in the _____ third of the tooth

Answer 9

Gingival

Question 10

The taper of a crown preparation, the angle, measured in degrees, formed between opposing axial walls

Answer 10

Convergence Angle

Question 11

Ideal convergence angle

Answer 11

6 degrees (recommended range: 2-10)

Question 12

The specific direction in which a prosthesis is placed on the abutment tooth or removed from it; should be nearly coincident with the tooth’s long axis

Answer 12

Path of Placement (POW- Path of Withdrawal)

Question 13

Any irregularity in the wall of a prepared tooth that prevents the seating or removal of a casting

Answer 13

Undercut

Question 14

The characteristics of the tooth preparation which tend to resist the removal of the restoration along its path of withdrawal

Answer 14

Retention Form

Question 15

Recommending CVC dimensions:

1. Central Groove
2. Functional Cusp
3. Non-functional cusp
4. Chamfer width
5. Liguo-occlusal line angle

Answer 15

1. 1 mm
2. 1.5 mm
3. 1 mm
4. 0.5 mm
5. 0.8 mm

Question 16

242.6 diamond bur Diameter

Answer 16

Minor .8 mm

Major 1.3 mm

Question 17

747.6 Diamond bur Diameter

Answer 17

Minor .6 mm

Major 1 mm

Question 18

169 L carbide bur Diameter

Answer 18

Minor .5

Major .8

Question 19

In a CVC prep (of mand 1st molar), the _____ is treated as a distal marginal ridge

Answer 19

Distal Cusp

Question 20

The characteristics of a tooth preparation which tend to prevent dislodgement by forces directed in an oblique or apical direction

Answer 20

Resistance form

Question 21

The functional cusp bevel should be ____ mm wide (not less than 1/4 the axial wall length) and at a ___ degree angle to POW

Answer 21

2-3

45

Question 22

Proximal clearance must be ___ mm from the adjacent tooth

Answer 22

0.5

Question 23

Chamfer should be ___ mm away from the free gingival margin

Answer 23

0.5