Dm Basics Of Tooth Decay

Front 1

what bacteria cause demineraliation?

Back 1

streptococcus mutans and lactobacillus

Front 2

if plaque is left for several days what happens

Back 2

it begins to leach Ca++ ions out of solution and solidify into calculus

Front 3

what does lactic acid do?

Back 3

brings down the oral pH and causes demineralization of teeth

Front 4

saliva contains what that helps rebuilds the tooth that lost from acid?

Back 4

calcium and phosphate

Front 5

what color does decay go from?

Back 5

chalky, white spots, to dark and soft, then cavitates

Front 6

any invasion of the enamel can be fixed by:

Back 6

Any materials such as a composite, amalgam.. etc

Front 7

any invasion into living tissue can be fixed by

Back 7

extraction of tooth
removal of pulp tissue by RCT

Front 8

mixture of 2 more metals

Back 8

alloy

Front 9

when is Hg mercury liquid?

Back 9

room temperature

Front 10

what classes can amalgam be used?

Back 10

1,2,6

Front 11

why is amalgam not used in class V?

Back 11

moisture control questions, hard to keep in, pt selection

Front 12

after RCT, much of coronal portion is missing either due to previous rest that were removed for RCT, caries, prep for the RCT or all of the above. what can we use when this occurs?

Back 12

we can use a build up to build up what was lost and place a full crown on it

Front 13

when root canals fail and need to be retreated what are the 2 options?

Back 13

do a second routine RC on tooth
or
do RCT surgery by flapping the gum and sealing the canal space at the apex w amalgam or super EBA cement

Front 14

rct surgery by flapping gum and sealing the canal space at apex w/ amalgam or super EBA cement is called what?

Back 14

retrofill

Front 15

what is percentage of silver in low copper amalgam?

Back 15

70%

Front 16

amount of tin in low copper amalgam

Back 16

27%

Front 17

amount of copper in low copper amalgam

Back 17

5%

Front 18

amount of silver i high copper amalgam

Back 18

46-60%

Front 19

amount of tin in high copper amalgam

Back 19

27%

Front 20

amount of copper in high copper amalgam

Back 20

13-30%

Front 21

what is antiquated method of making the powders

Back 21

shaving silver coins

Front 22

ingot of AgSn is cut on lathe producing small, irregular particles

Back 22

lathe cut alloy

Front 23

ingot of AgSn melted down and sprayed thru a nozzle creating a very small, uniform spheres of alloy

Back 23

spherical alloy

Front 24

mix of lathe cut and spherical alloys

Back 24

admixed alloy

Front 25

what type of reaction is the low copper amalgam?

Back 25

precipitation rxn

Front 26

beta/ gamma =

Back 26

unconsumed alloy particles

Front 27

gamma 1=

Back 27

ag2Hg3

Front 28

sn7hg=

Back 28

gamma 2

Front 29

strongest componet of set amalgam in low copper products?

Back 29

original and unreacted particles

Front 30

weakest componet of low copper?

Back 30

gamma 2 phase

Front 31

what are the problems with gamma 2?

Back 31

corrodes faster,
subject to fracture

Front 32

what makes high copper amalgam better

Back 32

the tin ions react with the copper and prevent formation of gamma 2 making a stronger and longer lasting rest

Front 33

what does more Hg in mix do?

Back 33

increases plasticity and set time

Front 34

what does properly trituated product look like?

Back 34

plastic shiny and holds together

Front 35

what does overmix cause

Back 35

hotter, drier, sticky mass with short working time and quicker set

Front 36

if proper mixing what happens upon set?

Back 36

dimensional change occurs and slight contraction of set mass

Front 37

is corrosion good with amalgam?

Back 37

yes!

Front 38

dimensional change of a material under constant stress

Back 38

creep

Front 39

what happens to zinc when it gets weT?

Back 39

EXPANDS

Front 40

what does bulk amalgam provide

Back 40

strength