SSC

Question 1

T/F is a SSC a fixed prep

Answer 1

False

Question 2

when are SSC useful?

Answer 2

• Grossly-broken down teeth
• Primary molars that have had pulpal therapy
• hypoplastic primary or permanent teeth
• dentition of kids at high caries risk

Question 3

what is the makeup of SSC?

Answer 3

18% chromium
8% nickel

Question 4

what gender is the nickel allergy more prevalent in?

Answer 4

females

Question 5

what are the contraindications for SSC?

Answer 5

• Esthetics
• Teeth that are nearing exfoliation
• Mechanical problems (e.g. space loss or caries beneath the level of the bone)
• Permanent restoration in the permanent dentition

Question 6

how many sizes are the SSC’s available in?

Answer 6

7 sizes for each primary and permanent molars

Question 7

what SSC sizes are the most commonly used?

Answer 7

Sizes 4 & 5

Question 8

T/F SSC need to be trimmed, contoured and crimped to fit

Answer 8

true

Question 9

when and who introduced SSC?

Answer 9

1950 by William humphrey

Question 10

Why do SSC’s make sense in Primary molars

Answer 10

• Inclined planes of cusps less steep; interrelationship of cusps with grooves with opposing teeth less precise
• Broad Contacts
• Squat, bulbous appearance/narrow occlusal table/buccal and lingual surfaces slope outward to form a prominent bulge just occlusal to the gingival margin
• Definite cervical constriction at the CEJ
• Gingival tissue is paler in color and has a preponderance of CT over blood vessels. Gingival margin is rounded vs knife edge as seen in adult dentition where it meets the tooth

Question 11

what burs will you need for SSC?

Answer 11

330 and 699

Question 12

what pliers will you need for SSC?

Answer 12

contouring plier
crimping plier

Question 13

what are the steps for SSC prep?

Answer 13

Occlusal reduction
Proximal reduction
Buccal and lingual reduction
Beveling
Round all sharp line angles and corners

Question 14

T/F all margins should be a chamfer with SSC

Answer 14

FALSE
all margins end in a feather edge

“this is important”

Question 15

where will our SSC have retention?

Answer 15

the undercut

Question 16

we want __________ on B/L
and ____________ on M/D
for SSC

Answer 16

undercuts
slight convergence towards occlucal

Question 17

what angle should the B/L should you bevel for SSC?

Answer 17

30-45 degrees

Question 18

how will most SSC seat?

Answer 18

L -> B

Question 19

how much will you trim for the SSC?

Answer 19

~1mm

Question 20

how should you trim the 1st primary molar for SSC?

Answer 20

stretched out S

Question 21

how should you trim the gingival contours of primary molars for SSC?

Answer 21

frown

Question 22

using the gingival plier you want to bend the _________ of the crown margins inward to restore anatomic margins and reduce the marginal circumference ensuring a good fit

Answer 22

gingival 3rd

Question 23

what should the buccal gingival contour of the second primar molar look like with SSC trimming?

Answer 23

smile

Question 24

what side of the crimping plier goes inside the crown

Answer 24

shorter side

Question 25

what kind of crimping plier do we use for the SSC?

Answer 25

118

Question 26

T/F after cementation you need to adjust the occlusion for the crown

Answer 26

false
do not attempt to adjust occlusal surface of SSC

Question 27

what should you use to finish/polish the SSC?

Answer 27

heatless stone
rubber wheel
tripoli and rouge

Question 28

what should you hear if the SSC is done well

Answer 28

a snap

Question 29

why will SSC’s fail?

Answer 29

• Poor tooth preparation
• Poor crown retention/adaptation
• Occlusal surface wears through
• Poor distal margin adaptation allows permanent molar to erupt ectopically under a second primary molar

Question 30

what is the chief gaol of a SSC?

Answer 30

replication of normal crown form/function