Pres-Res Fall Final Musod D1

Front 1

General amalgam principals

Back 1

no term on cusp tips, remove weakend enamel, smooth, 1.5mm depth

Front 2

Class II outline form

Back 2

carious fissures, pulpal depth 1.5, smooth curves, isthsumus ¼ intercuspal, gingival floor with 1-.5, axial wall contour, marginal ridge with (1.6/2)

Front 3

Class II retention

Back 3

convergence of walls and box, dovetails, bonding agent

Front 4

Class II resistance

Back 4

round line angles, flat pulpal floor, isthsmus, MD wall, margins, ridges, axial wall

Front 5

Class II convenience

Back 5

isthmus width, gingival/proximal clearance

Front 6

When to check occlusion

Back 6

prior to prep and after carving

Front 7

Indications for amalgam

Back 7

class 1,2,5,6; core buildup, large, poor isolation, heavy contact, abutment for dentures, temporary restorations

Front 8

Contraindications for amalgam

Back 8

esthetic, small restorations

Front 9

Advantages of amalgam

Back 9

easy, high compressive strength and wear resistance, long term, cost

Front 10

Disadvantages of amalgam

Back 10

non-esthetic, poor insulator, less conservative, weakens tooth, difficult prep, marginal leakage

Front 11

Spherical amalgam

Back 11

little condensation pressure, high early strength, large restorations, faster set

Front 12

Lathe cut

Back 12

irregular, more condensation pressure

Front 13

Admixed amalgam

Back 13

lathe + spherical

Front 14

Coef. Of expansion of amalgam

Back 14

2.5X tooth structure

Front 15

Compressive strength

Back 15

similar to tooth structure

Front 16

Tensile strength

Back 16

low

Front 17

Is amalgam brittle?

Back 17

Yes

Front 18

High or low edge strength?

Back 18

Low

Front 19

Good thermal conductor?

Back 19

yes

Front 20

Should you burnish matrix band?

Back 20

Yes

Front 21

Number of ways to make band

Back 21

three

Front 22

Band arch should go towards

Back 22

occlusal surface

Front 23

Wedges help prevent gingival overhang

Back 23

true

Front 24

Wedges help restore interprox. Contour

Back 24

true

Front 25

Wood wedges are made of

Back 25

sycamore

Front 26

Cool property of sycamore

Back 26

expands when wet

Front 27

Type of plastic wedge

Back 27

fender, for protection adjacent tooth

Front 28

Holder arm of matrix goes

Back 28

on buccal side of tooth

Front 29

Trituration

Back 29

mixing mercury and amalgam powder

Front 30

If properly triturated amalgam is

Back 30

homogeneous

Front 31

Under and over trituration can cause

Back 31

decreased strength

Front 32

Obj of condensation

Back 32

adaptation, compaction, reduce residual mercury

Front 33

Wich condenser is used first?

Back 33

Smallest

Front 34

Larger the nib

Back 34

less force per unit area

Front 35

First condense to

Back 35

deeps part of prep

Front 36

Overfill

Back 36

covering cavosurface with amalgam

Front 37

Overfill purpose

Back 37

eliminate voids, reduce mercury

Front 38

Precarve burnish

Back 38

ensures adaptation of amalgam at margins, smooth, pushes merc to surface

Front 39

Carving

Back 39

restore form/function, remove mercury rich layer, remove overhang

Front 40

Overcarving amalgam can cause

Back 40

weakness, undercontouring

Front 41

Undercarving amalgam can

Back 41

leave a layer of flash

Front 42

Flash

Back 42

is overhang, can fracture and cause a void

Front 43

Avoid chewing sticky things for

Back 43

24 hours after restoration has been placed

Front 44

In class II remove facial/lingual excess with

Back 44

hollenback or explorer

Front 45

Removing matrix band

Back 45

do not take off straight up

Front 46

What to use for polishing

Back 46

white stone, rubber abrasive point

Front 47

Repairing fracture when placing

Back 47

use highspeed to cut small prep then fill it

Front 48

The gama1 and 2 phase are present in low copper amalgam allow powder before its mixed with mercury

Back 48

false

Front 49

Epsilon and eta phase are present in

Back 49

high copper amalgams

Front 50

Metallic phase that’s most corrodible, softest, weakest

Back 50

gamma 2

Front 51

High copper amalgam allow powder contains

Back 51

more than 6% copper, tin, gamma phase

Front 52

Metal that may or may not be present

Back 52

zinc

Front 53

Correlation with low copper amalgam and

Back 53

increased margin breakdown, increased corrosion

Front 54

No relationship with mercery amalgam and medical problems

Back 54

true besides allergy

Front 55

Threshold limit for exposure to mercery vapor

Back 55

.o5 mg/cubic meter

Front 56

To reduce mercury vapor in office

Back 56

use spray/hivac, premeasured capsuls, ventilation

Front 57

Conditions for delayed expansion

Back 57

zinc, contamination, several days/weeks time

Front 58

Reasons for bulk fractor of amalgam

Back 58

inadequate condensation, wrong mercury/alloy ratio, high surfaces after carving

Front 59

Polishing should be delayed because

Back 59

strength of restoration increases with time

Front 60

Amalgam with more than 6% copper

Back 60

modern, high coper

Front 61

Zinc

Back 61

acts as scavenger during manufacturing

Front 62

Strongest phase set in amalgam

Back 62

gamma

Front 63

Weakest most corodable phase?

Back 63

Gamma 2

Front 64

Amalgamation reaction

Back 64

between mercury silver tin copper

Front 65

Amalgam used in posterior because

Back 65

high wear resistance, high compressive strength

Front 66

Dimensional change that occurs in zinc with moisture contamination is

Back 66

delayed expansion

Front 67

Increased copper leads to

Back 67

increased strength

Front 68

Gamma 2 phase is

Back 68

tin-mercury

Front 69

New amalgams use

Back 69

gallium, doesn’t work good

Front 70

Spherical has greater resistance to condensation than lathe

Back 70

false

Front 71

Delayed expansion occurs with contamination after set

Back 71

false (during set)

Front 72

Strength of dental amalgam

Back 72

increases with time

Front 73

amalgam with lower than 6% copper

Back 73

conventional (lower)

Front 74

beta phase

Back 74

silver-tin a

Front 75

gamma phase

Back 75

silver-tin b; INTERMETALLIC COMPOUND

Front 76

eutectic phase of amalgam

Back 76

silver-copper

Front 77

epsilon phase of amalgam

Back 77

copper-tin

Front 78

gamma 1 phase

Back 78

silver-mercury

Front 79

gamma 2 phase

Back 79

tin-mercury

Front 80

new (n) phase

Back 80

copper-tin (2)

Front 81

dispersalloy

Back 81

high copper amalgam used in lab
silver-tin-copper + mercury

Front 82

amalgam setting reaction

Back 82

mercury disolves silver-tin around gamma phases
G1,G2,E,N phases form around unused gammas in that order

Front 83

the gamma 2 phase is undesirable
the gamma 2 phase is incerased if partiles are not heat treated or if heat treated for too long

Back 83

true
true

Front 84

which phase eliminates the gamma 2 phase in admix high copper?

Back 84

n

Front 85

why is burnishing done during carving?

Back 85

for better adaptation at margins

Front 86

positive effects of polishing amalgam are

Back 86

resistance to calculus
reduce tarnishing and corrosion

Front 87

which type of amalgam has the most creep?

Back 87

low copper (2.00)

Front 88

which type of amalgam is the strongest (compresive and tensile)

Back 88

high copper SINGLE composition

Front 89

knoop hardness

Back 89

106-174

Front 90

why do northern eruopean contries ban the use of amalgam?

Back 90

to reduce the overall amount of mercury in their enviornment

Front 91

where should scrap amalgam be stored?

Back 91

under water in enclosed containers

Front 92

which is more affordable -amalgam or resin?

Back 92

amalgam

Front 93

which has a lower wear resistance and is more technique sensitive amalgam or resin?

Back 93

resin

Front 94

esthetics is a justifiable reason to use resin over amalgam

Back 94

true