SSC for Primary Molars

Question 1

preformed extracoronal restorations are useful in the restoration of what? (2)

Answer 1

1. grossly-broken down teeth
2. primary molars that have had pulpal therapy

Question 2

who gets SCC? (4)

Answer 2

1. hypoplastic primary of permanent teeth
2. dentitions of kids at high caries risk
3. special needs patients (rampant caries treated in operating room)
4. operator error when there is an overextension of proximal box

Question 3

are full case crowns recommended for hypoplastic primary or permanent teeth?

Answer 3

NO! FCC not recommended until growth has ceased

Question 4

SCC is also referred to as what?

Answer 4

chrome steel crowns

Question 5

what are SCC made of?

Answer 5

alloy containing 18% chromium and 8% nickel

Question 6

Strength of SCC increases with what

Answer 6

manipulation with pliers

Question 7

what part of SCC alloy reduces corrosion

Answer 7

chromium

Question 8

what part of SCC alloy may elicit an allergic response in some patients? is this more prevalent in males or females?

Answer 8

nickel; females

Question 9

are intraoral allergic responses more prevalent than extraoral responses?

Answer 9

NO! intraoral responses seem to be more minimal than extraoral responses and are scarce

Question 10

contraindications to SCC (4)

Answer 10

1. esthetics
2. teeth nearing exfoliation
3. mechanical problems (space loss and caries beneath the level of the bone)
4. permanent restoration in the permanent dentition

Question 11

how many sizes of SSC?

Answer 11

7 for each primary teeth and permanent molars

Question 12

what size SSS is most commonly used? what is the smallest and largest one?

Answer 12

most common: 4 and 5
smallest: 1
largest: 7

Question 13

who introduced SSC to pediatric dentistry? what used to used before SSC?

Answer 13

1950 - Dr. William Humphrey
othodontic bands filled with amalgam were a last resort

Question 14

what is the Hall technique?

Answer 14

involves no caries removal
no crown preparation
no use of local anesthetic before placement of SSC

Question 15

why do SSC make sense in primary molars

Answer 15

1. inclined planes of cusps less steep; interrelationship of cusps with grooves with opposing teeth LESS precise
2. broad contacts
3. definite cervical constriction at CEJ
4. gingival tissue is paler in color and has preponderance of CT over blood vessels. Gingival margin is rounded vs. knife edge as seen in adult dentition where it meets the tooth

Question 16

when checking occlusion in patient’s with SSC, you only have to do what?

Answer 16

have patient bite into centric and examine occlusion visually

Question 17

completed crown should restore contacts where present but also reproduce what?

Answer 17

reproduce the broad flat contacts

Question 18

bulge is more prominent on the ___ of mandibular molars and ___ of maxillary molars

Answer 18

buccal; lingual

Question 19

what is the primary factor in crown retention

Answer 19

buccal/lingual bulge undercut

Question 20

T/F: Plaque accumulation & frequency of gingival problems associated with SSC’s in primary teeth seem to be unexceptional.

Answer 20

TRUE!

however, some increased inflammation is seen in permanent dentition after puberty

Question 21

describe the different pliers for SCC

Answer 21

118 Crimping - flat, one side longer (outside crown) and the other shorter (inside crown)

# 114 Contouring - ball and socket look

Question 22

what are the steps in crown preparation

Answer 22

1. occlusal reduction
2. proximal reduction
3. buccal and lingual reduction
4. beveling
5. round all sharp line angles and corners

Question 23

all margins should end how

Answer 23

feather edge

Question 24

T/F: the SSC ultimately fits ABOVE the feather edge margin and is adapted into the undercut

Answer 24

FALSE! it’s going to fit over the feather edge margin

Question 25

do we want ledges?

Answer 25

NO! that's for fixed/perm dentition!

Question 26

after doing local anesthetic and isolation, what is the done next?

Answer 26

1. caries removal 2. complete pulp therapy if necessary 3. proceed with crown prep

Question 27

what is occlusal reduction for SSC

Answer 27

1-1.5 mm

Question 28

is it okay to have a M-D taper for primary molar SSC?

Answer 28

YES! just don't over taper. this isn't a fixed prep

Question 29

you must be able to drag your explorer fro m buccal to lingual at the ___ without obstruction

Answer 29

level of the feather edge

Question 30

if the buccal or lingual bulges are so prominent that the constricted margin of the crown will not go over the HOC, what should be done

Answer 30

the prep should be modified

Question 31

A bevel on both the BUCCAL and LINGUAL at an angle of ___ degrees removes the sharp cusp tips and creates a gentle slope in the occlusal third of the lingual and buccal surfaces. This allows what? This restores what?

Answer 31

30-45 This allows the crown to slip on. This then restores the narrow B-L occlusal table.

Question 32

When trying on the crown, it should seat from ___ to ___

Answer 32

lingual to buccal

Question 33

order of completing crown adaptation

Answer 33

1. trim gingival margin 2. contour 3. crimp 4. polish

Question 34

when adaptating the crown: - mark gingival line with what? - trim how many mm beneath the mark using what?

Answer 34

mark gingival line with sharp instrument trim 1 mm beneath the mark using a heatless stone

Question 35

margins should be trimmed to lie parallel to what? and consist of what?

Answer 35

trimmed to lie parallel with contour of the gingival tissue and consist of a series of curves without sharp angles

Question 36

buccal gingival contour of SECOND primary molar =

Answer 36

smile

Question 37

buccal gingival contour of FIRST primary molar =

Answer 37

stretched-out S

Question 38

proximal gingival contour of primary molars =

Answer 38

frown

Question 39

can you adjust occlusal surface of SSC?

Answer 39

NO! you will perf

Question 40

use ___ to smooth jagged edges use a ___ to remove small scratches and smooth polish surface of crown to high shine with ___

Answer 40

heatless stone rubber wheel tripoli and rouge

Question 41

what do you use to cement SSC

Answer 41

GI cement

Question 42

what are common SSC crown failures (4)

Answer 42

1. poor tooth prep 2. poor crown retention/adaptation 3. occlusal surface wears thru 4. poor distal margin adaptation allows perm molar to erupt economically under a second primary molar

Question 43

what is the chief goal of full coronal restoration using preformed SSC?

Answer 43

replication of normal crown form and function