Lab 2: Stainless Steel Crown (SSC) and Restorations of Caries II

Question 1

Occlusal surface is reduced ___-___mm and follows ___ form.

Answer 1

1-1.5; cusps

Question 2

T/F. Proximal contact IS broken, with reduction NOT greater than 1mm.

Answer 2

True.

Question 3

Proximal walls are ___ or slightly ___ to occlusal. Proximal cuts end ___ without chamfer, shoulder, or ledge.

Answer 3

parallel; convergent; cervically

Question 4

Proximal walls are ___ when viewed from occlusal and ___ to arch perimeter.

Answer 4

straight; perpendicular

Question 5

T/F. When prepping for a SSC, the cerivcal bulge remains and there is little to no buccal or lingual reduction.

Answer 5

True.

Question 6

The crown is trimmed ___mm below the gingival margin. and the crown margin is fluid in form and follows contour of gingiva.

Answer 6

1

Question 7

Surface is contoured in the gingival ___ of buccal, lingual, mesial and distal.

Answer 7

1/3rd

Question 8

The crown is ___ at the gingival margins and tightly adapted to the tooth surface on buccal, mesial, lingual and distal.

Answer 8

crimped

Question 9

What does the crown restore?

Answer 9

occlusion
contact (if present before procedure)
gingival health

Question 10

T/F. A SSC is indicated to restore carious primary teeth that would otherwise require a large amalgam or composite restoration.

Answer 10

True.

Question 11

T/F. SSCs are not used following a pulpotomy or pulpectomy.

Answer 11

False, it restores primary teeth following a pulpotomy or pulpectomy

Question 12

T/F. SSCs restore teeth with HYPOplastic enamel.

Answer 12

True.

Question 13

T/F. SSCs restore primary teeth with multiple carious lesions in patients with high decay rates who are at risk for recurrent caries.

Answer 13

True.

Question 14

T/F. SSCs are not used in patients with hereditary anomalies, such as amelogenesis imperfecta and dentinogenesis imperfecta.

Answer 14

False, they are used in patients with hereditary anomalies

Question 15

SSCs restore primary teeth as ___ for fixed appliances and provide ___ for removable appliances.

Answer 15

abutments; retention

Question 16

SSCs provide ___ restoration for permanent molars and fractured teeth.

Answer 16

temporary

Question 17

The ___ crown is a pre-trimmed, pre-contoured, and pre-crimped crown.

Answer 17

3M

Question 18

T/F. With 3M crowns, trimming of the gingival margin is required but contouring and crimping is not necessary.

Answer 18

False, NO trimming of the gingival margin is required, although further contouring and crimping is sometimes necessary

Question 19

T/F. The occlusal anatomy of 3M crowns are MORE prominent, with more secondary anatomy than you see on Unitek crowns.

Answer 19

True.

Question 20

___ crowns are NOT pre-contoured or pre-crimped. They are almost always at least ___-___mm too long and must be trimmed with crown and bridge scissors before contouring and crimping.

Answer 20

Unitek; 1-2

Question 21

Which crown type takes more time and expertise to place?

Answer 21

Unitek crowns

Question 22

The pediatric dentistry clinic stocks both crowns however, Unitek crowns are used most often.

Answer 22

False, 3M is used most often

Question 23

When evaluating the preoperative occlusion, what should be noted bilaterally?

Answer 23

the dental midline and the cusp-fossa relationship

Question 24

Where should local anesthesia be obtained?

Answer 24

lingual, palatal, buccal and lingual

Question 25

The gingival proximal margin should have a ___-___ finish line.

Answer 25

feather-edge

Question 26

T/F. Ledges formed by deep caries should NOT be removed.

Answer 26

True.

Question 27

T/F. All of the angles of the preparation should be rounded to remove corners so that you are left with a round preparation.

Answer 27

False, All of the angles of the preparation should be rounded to remove corners but NOT so much as to create a round preparation.

Question 28

What is the goal of crown selection?

Answer 28

to place the smallest crown that can be seated on the tooth and to establish pre-existing proximal contacts.

Question 29

How should the selected crown be tried onto the tooth?

Answer 29

by seating the lingual first and applying pressure in a buccal direction so that the crown slides over the buccal surface into the gingival sulcus.

Question 30

After seating the crown, how do you establish a preliminary occlusal relationship?

Answer 30

by comparing adjacent marginal ridge heights

Question 31

A properly trimmed crown will extend approximately ___mm into the gingival sulcus.

Answer 31

1

Question 32

What process involves bending the gingival one third of the crown's margins inward to restore anatomic features of the natural crown and to reduce the marginal circumference of the crown, ensuring a good fit?

Answer 32

contouring

Question 33

How is the final close adaptation of the margin of the crown to the tooth surface achieved?

Answer 33

by crimping the cervical 1 mm of the margin circumferentially

Question 34

What three things does a tight marginal fit aid in?

Answer 34

1. mechanical retention of the crown 2. protection of the cement from exposure to oral fluids 3. maintaining gingival health

Question 35

When removing the crown, a ___ or ___-___ can be used to engage the gingival margin and dislodge the crown.

Answer 35

spoon; cleoid-discoid

Question 36

What must be removed so that the crown may be replaced and occlusion may be checked?

Answer 36

rubber damn.

Question 37

T/F. Final smoothing and polishing of the crown margin should be performed after final cementation.

Answer 37

False, before final cementation

Question 38

How is smoothing performed?

Answer 38

it is begun with the heatless tone to create smooth, flowing curves and to thin the margin of the crown slightly. Rotation of the stone is toward and at 45 degree angle to the edge of the crown. A rubber wheel is used to remove surface scratches, using light, brushing strokes

Question 39

What cement is preferred?

Answer 39

a glass ionomer cement

Question 40

When reducing buccal and lingual surfaces due to a large cervical bulge or unusual contour of buccal or lingual, what should you remember?

Answer 40

do not destroy the natural undercut and all reduction must end with no ledge

Question 41

In what direction is a crown normally removed?

Answer 41

buccal to lingual

Question 42

If you are unsure on what size SSC to select, start with ___ or ___ (middle of size range).

Answer 42

4; 5

Question 43

Match the pliers with their numbers. 114 137 417 Gordon johnson crimping plier

Answer 43

114 (johnson) 137 (gordon) 417 (crimping plier)

Question 44

When seating adjacent crowns, increase the proximal reduction between SSCs ___mm between the teeth.

Answer 44

1.5

Question 45

What is the #1 mistake to avoid with SSCs?

Answer 45

prepping the wrong teeth similarity of 2nd primary and 1st permanent molars

Question 46

What is the #2 mistake to avoid with SSCs?

Answer 46

gingival ledge