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Fixed Final > CVC Intro (22) > Flashcards

CVC Intro (22) Flashcards

1
Q

Preparation definition

A

The final shape to receive a restoration

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2
Q

Complete veneer crown preparation

A

Extracoronal preparation involving the entire clinical crown

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3
Q

Complete veneer crown

A

A cast-gold extracoronal which covers the clinical crown

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4
Q

Path of withdrawal

A

The imaginary line along which a casting is moved when it is separated from its single crowns preparation
Should be nearly coincident with the tooth’s long axis
Want it to be +/- 5 degrees

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5
Q

Axial wall

A

Part of a crown prep prepared in the long six of the tooth - can be designated as buccal, lingual, mesial, or distal

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6
Q

Convergence angle

A

The angle or taper formed by diametrically opposed axial walls
Should be ~6 degrees

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7
Q

Chamfer

A

The cervical junction of the prepared axial wall and the unprepared portion of the tooth structure.s. Extends around the most cervical portion of the tooth prep.

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8
Q

Line angles

A

Lines formed by the junction of any two tooth surfaces. Should be rounded in a CVC prep

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9
Q

Axial wall line angle

A

The junction between 2 axial walls

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10
Q

Occlusoaxial line angle

A

The junction between the occlusal surface and an axial wall

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11
Q

Cavosurface line angle

A

The junction of prepared and unprepared tooth

This is an external line angle

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12
Q

Depth orientation grooves

A

Grooves placed on the surface of the tooth to provide a reference to determine when sufficient tooth structure has been reduced

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13
Q

Functional cusp bevel

A

A wide bevel placed on the functional cusps, the thickness of which ensures that correct contours of the final restoration be re-established while providing correct convergence and adequate thickness of materials

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14
Q

Undercut

A

A crown preparation is undercut if a wax pattern cannot be withdrawn from its die without distortion

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15
Q

Occlusal clearance

A

The distance between the occlusal surface of the prepared tooth and the occlusal surface of the opposite tooth.
This is evaluated during excursive jaw movements as well as in as well as in intercuspal position

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16
Q

Retention form

A

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

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17
Q

Resistance form

A

The characteristics of a tooth preparation which tends to prevent dislodgment of a seated restoration by force in an optical or oblique direction.

18
Q

CVC Advantages

A

High strength
Longevity
High resistance to displacement
Ability to modify axial contours an occlusion

19
Q

CVC Disadvantages

A

Display of metal
Removal of tooth substance
Vitality testing
Margin close to gingival tissue which can lead to inflammation

20
Q

CVC indications

A 
Extensive destruction by caries or trauma
Endodontically treated teeth
Large existing restorations
Maximum retention needed
Recontouring of axial surfaces
Correction of malinclination
Correction of occlusal discrepancies
To provide contours suitable for a removable partial denture
21
Q

CVC contraindication

A

Wherever a tooth can be adequately restored with a more conservative restoration

22
Q

Principles of tooth preparation

A

Conservation of tooth structure
Marginal integrity of the restoration
Adequate retention and resistance
Structural durability

23
Q

Conservation of tooth structure

A

Minimum tooth reduction compatible with adequate strength and correct contour

24
Q

Marginal integrity of the restoration

A

The tooth restoration interface at the gingival margin is a potential site of failure due to cement dissolution or roughness. The prep should be designed to enable a smooth, strong, well-adapted casting to be provided

25
Q

Excessive tooth reduction will occur if…

A
  • the tooth is peeped with excessive convergence
  • the prep does not follow the anatomy of the tooth
  • the POW diverges from the long axis of the tooth
  • Excessively wide margin
  • Excessive gingival extension
26
Q

Inadequate marginal integrity will occur if…

A
  • The chamfer is too narrow to provide sufficient bulk of restorative material without over contouring
  • The cavo-surface line angle cannot easily be determined during laboratory procedures
  • The chamfer is rough or uneven
  • The preparation is undercut causing distortion of the wax pattern
27
Q

Causes of inadequate retention and resistance

A
  • Excessive convergence angle
  • Inadequate height and surface of the axial walls
  • Insufficient surface area to resist tipping
28
Q

Functional cusps recommended and acceptable range

A
  1. 5 mm

1. 3-1.7mm

29
Q

Central groove thickness

A
  1. 0mm

0. 8-1.2mm

30
Q

Non-funcitonal cusp thickness

A
  1. 0mm

0. 8mm-1.2mm

31
Q

Chamfer width

A
  1. 5mm

0. 4mm-0.7mm

32
Q

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

A

0.2mm more shallow

33
Q

What considerations should be taken into effect

A

Biological considerations
Mechanical considerations
Esthetic consideration

34
Q

What biological considerations should be taken?

A

Prevent damage during tooth prep
Considerations affecting future dental health
Conservation of tooth structure

35
Q

What mechanical considerations should be taken?

A

Providing resistance form
Providing retention form
Preventing deformation fo teh prep

36
Q

What are the indications for a crown?

A 
Extensive coronal destruction
Short clinical crowns
Endo treated
Maximum retention and resistance are needed
Correction of axial contours
37
Q

What are contraindications for a crown?

A

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

38
Q

Why does a crown have greater retention than more conservative restorations?

A

All axial surfaces of the tooth are included

39
Q

T/F - A crown has greater resistance than a partial coverage restoration on the same tooth

A

True

40
Q

T/F - A complete cast crown allows the operator to modify axial tooth contours and the occlusal surface

A

True

41
Q

What are the disadvantages of a crown?

A

Remmoves a large amount of tooth structure
Can have adverse effects on tissue
Display of metal
Vitality testing is not feasible

Fixed Final (8 decks)

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