Class V Cavity Preparations Flashcards Preview

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Flashcards in Class V Cavity Preparations Deck (22)
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1
Q

class V lesions involve ____ apical to the height of contour on the ___ and ____ surfaces of all teeth

A

smooth surfaces; facial; lingual

2
Q

class V preps are at the ____ of the facial and lingual of the crowns due to lesions (carious and non carious)

A

gingival 1/3

3
Q

Clinically, the shape and the size (outline form) of class V cavity preparation depends on

A

1- extent of the lesion
2- preexisting restoration
3- location of the lesion
4- restorative material of choice

4
Q

characteristics of ideal/small lesions / classical more conservation preparations

A

cervical/apical to height of contour
confined between mesial and distal line angles
do not extend to the cemento-enamel junction

5
Q

characteristics of non-ideal lesions/modified

A

extends to height of contour/occlusal to HOC
extension into mesial and distal
extension to become root surface caries

6
Q

amalgam requires:

A
  • butt joint margin
  • uniform axial depth
  • secondary retention (walls are divergent facially)
7
Q

tooth colored restorations

A
  1. composites
  2. compomers
  3. glass ionomers
  4. resin modified glass ionomers
8
Q

ideal class 5 cavity design is _____ shape

A

trapezoidal/kidney

9
Q

external walls of class 5 cavity preps

A
  1. gingival wall
  2. incisal/occlusal wall
  3. mesial wall
  4. distal wall
10
Q

internal wall

A

axial wall

11
Q

enamel rods have different ____ in different locations

A

directions

12
Q

directions of enamel rods:

A

horizontal, vertical, or oblique (diverge external)

13
Q

the distance of the external surface to the axial wall

A

axial depth

14
Q

____ thickness in the gingival 1/3 is not even and uniform

A

enamel

15
Q

clinically, the depth of ideal cavity preparation is _____

A

0.5 mm into dentin

16
Q

axial depth is ____ on the crown

A

1.0-1.25 mm

17
Q

axial depth is ____ on the root

A

0.75 mm

18
Q

preparation of the axial wall depth ___ into the DEJ results in a uniform depth for the entire preparation

A

0.5 mm

19
Q

Because the axial wall follows the mesiodistal and incisogingival contours of the facial surface of the tooth, it will usually be _____in both directions

A

convex

20
Q

incisal, gingival, mesial, and distal walls ____ to follow the enamel rods

A

diverge facially

21
Q

There is no _____ in ideal class V preparation

A

primary mechanical retention

22
Q

_____ is added like retention grooves

A

auxiliary/secondary