SSC Flashcards
T/F is a SSC a fixed prep
False
when are SSC useful?
- Grossly-broken down teeth
- Primary molars that have had pulpal therapy
- hypoplastic primary or permanent teeth
- dentition of kids at high caries risk
what is the makeup of SSC?
18% chromium
8% nickel
what gender is the nickel allergy more prevalent in?
females
what are the contraindications for SSC?
- 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
how many sizes are the SSC’s available in?
7 sizes for each primary and permanent molars
what SSC sizes are the most commonly used?
Sizes 4 & 5
T/F SSC need to be trimmed, contoured and crimped to fit
true
when and who introduced SSC?
1950 by William humphrey
Why do SSC’s make sense in Primary molars
- 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
what burs will you need for SSC?
330 and 699
what pliers will you need for SSC?
contouring plier
crimping plier
what are the steps for SSC prep?
Occlusal reduction
Proximal reduction
Buccal and lingual reduction
Beveling
Round all sharp line angles and corners
T/F all margins should be a chamfer with SSC
FALSE
all margins end in a feather edge
“this is important”
where will our SSC have retention?
the undercut
we want __________ on B/L
and ____________ on M/D
for SSC
undercuts
slight convergence towards occlucal
what angle should the B/L should you bevel for SSC?
30-45 degrees
how will most SSC seat?
L -> B
how much will you trim for the SSC?
~1mm
how should you trim the 1st primary molar for SSC?
stretched out S
how should you trim the gingival contours of primary molars for SSC?
frown
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
gingival 3rd
what should the buccal gingival contour of the second primar molar look like with SSC trimming?
smile
what side of the crimping plier goes inside the crown
shorter side
