restoring with amalgam

Question 1

When is amalgam indicated?

Answer 1

poor moisture control
poor patient cooperation
high occlusal loading
cusp replacement
financial constraints
no enamel margins
subgingival cavities

Question 2

What did the high copper alloy compostion eliminate?

Answer 2

gamma 2 phase

tin/mercury phase

Question 3

what occurs at the tin mercury phase?

Answer 3

weakest phase

causes expansion

Question 4

what does the copper/tin phase do?

Answer 4

improves strength

reduces creep

Question 5

what was the problem with mercury free alloys?

Answer 5

increased corrosion

excessive post setting expansion

Question 6

what is the procedure for class 11 restoration?

Answer 6

outline form- access occlusally, leaving enamel slither
remove caries- tidy margins, remove unsupported enamel
restore- place band, pack and carve

Question 7

What are therapist controlled variables when restoring with amalgam?

Answer 7

trituration
condensation
burnishing
polishing

Question 8

what does over trituration cause?

Answer 8

hot mix- sticky

decreased working time

Question 9

what does under trituration cause?

Answer 9

grainy, crumbly mix

Question 10

what are condensation rules re. lathe cut alloy?

Answer 10

small condenser

high force

Question 11

what are condensation rules re. spherical alloys?

Answer 11

larger conesner
easier to displace
requires less force

Question 12

what are rules in general re. condensation?

Answer 12

condenser must fit
place amalgam in increments
condense with pressure
over pack

Question 13

what doe carving do

Answer 13

removes mercury rich layer

removes gross gingival excess

Question 14

what does burnishing do?

Answer 14

removes excess mercury, improves margin adaption
improves smoothness
less leakage

Question 15

When should you polish?

Answer 15

after 24 hours

Question 16

what does polishing do?

Answer 16

increases smoothness
decreases plaque retention
decreases corrosion

Question 17

When should a bonded amalgam be used?

Answer 17

when not enough tooth structure for retention
missing cusp
achieve complete marginal seal

Question 18

what does a good marginal seal do?

Answer 18

prevents ingress of bacteria

protect the pulp

Question 19

what are the benefits of bonded amalgam compared with composite?

Answer 19

no polymerisation shrinkage

Question 20

what are the advantages of a bonded amalgam?

Answer 20

reduces need for prep of retentive features
reduces marginal leakage
reinforced tooth structure

Question 21

describe the technique for a bonded amalgam

Answer 21

vitrebond liner
acid etch margins
prime and bond
rely x arc- uncured ( chemical cure resin based cement)
pack amalgam

Question 22

what is the toxic element in amalgam?

Answer 22

mercury

Question 23

what allergic reactions can amalgam cause?

Answer 23

lichen planus

dermatitis

Question 24

What is the theoretical risk of foetal damage?

Answer 24

Hg can cross the placental barrier