restorative and aesthetic material ch 43

Question 1

amalgam =

Answer 1

name given to “silver things”

Question 2

consists of many different metals with silver being the predominant metal. Mixed with approx, equal parts of mercury

Answer 2

dental amalgam

Question 3

contraindications to dental amalgam

Answer 3

asthetics are important
pt has a history of allergy to mercury
cost

Question 4

alloy powder mixed with mercury
forms a soft pliable mixture
when placed in a tooth, condensed, carved, and allowed to harden, the mixture become a permanent

Answer 4

dental amalgam

Question 5

silver

Answer 5

65% gives amalgam its strength and silver color

Question 6

tin

Answer 6

29% for its workability and strength

Question 7

copper

Answer 7

6% for its strength and corrosion resistance ability

Question 8

zinc

Answer 8

2%, to suppress oxidation

Question 9

—-+—– = amalgam

Answer 9

alloy + mercury

Question 10

physical characteristics of mercury

Answer 10

liquid at room temp
vaporizes with increased heat
highly poisonous

Question 11

where to store scrap amalgam

Answer 11

in a wide mouth airtight container marked

non-contact amalgam

Question 12

amalgam handling

Answer 12

do not contact skin
protect against spillage during mixing
do not throw away in general waste

Question 13

advantages of amalgam

Answer 13

best restorative material for posterior teeth
user friendly can be mixed, placed, and carved in a short time
can last very long

Question 14

disadvantages of amalgam

Answer 14

non-esthetic in color
contains mercury so its dangerous
takes 24 hrs to completely set

Question 15

capsules (600 mg of alloy)

Answer 15

for small or single surface restorations

Question 16

capsules (800 mg of alloy)

Answer 16

for larger restorations

Question 17

trituration

Answer 17

process by which the mercury and alloy powders are mixed together to form the mass of amalgam

Question 18

what is mixing done by

Answer 18

an amalgamator

Question 19

Etch can be supplied as

Answer 19

liquid/gel
malice acid
phosphoric acid

Question 20

what removes the smear layer

Answer 20

acid etching

Question 21

when you apply etch to enamel how long do you leave it for

Answer 21

ranges from 15-30 secs

Question 22

T/F; avoid contact with soft tissue, rinse thoroughly if contaminated with acid etch .. Protect pulp

Answer 22

True

Question 23

Bonding agents function

Answer 23

reduce microleakage, reduce sensitivity , help living tissue inside tooth recover from stress

Question 24

when to place bonding agents

Answer 24

placed in tooth after cavity prep and just before placement or restorative material

Question 25

reducing the microscopic gap can

Answer 25

improve retention by creating micro mechanical retention

Question 26

enamel bonding is placed

Answer 26

directly onto the intact enamel surface

Question 27

examples of enamel bonding

Answer 27

sealants, bonded veneers, resin bonded bridges, bonded ortho brackets

Question 28

dentin bonded is placed

Answer 28

on prepared dentin in order to bond .

Question 29

t/f; before you put dentin bond, smear layer must be removed first for successful bonding (use of etchant)

Answer 29

True, smear layer acts as a semi impermeable layer which prevents the bonding from contacting actual surface of dentin

Question 30

what are the 3 different cures

Answer 30

light cured
self cured
dual cured

Question 31

how long should you light cure for

Answer 31

20-30 secs, following manufactures instructions

Question 32

composite resins uses and characteristics

Answer 32

good for anterior teeth
can be placed in poster teeth but not as strong as amalgam
matches teeth color

Question 33

advantages of composite resin

Answer 33

helps prevent breakage and damage
last 6-12 yrs
very little sensitivity to hot/cold
dentist will not drill as much of the tooth

Question 34

disadvantages of composite resin

Answer 34

require more time to apply

higher cost

Question 35

Conventional composites contain the largest filler particles, therefore provide the greatest strength, but duller and rougher on the surface

Answer 35

macrofilled (posterior teeth)

Question 36

contain inorganic filler that is much smaller and is capable of producing a highly polished finished restoration, used primarily in anterior restoration

Answer 36

microfilled

Question 37

composites contain both macrofill and microfill particles. Can be polished smooth and has good strength

Answer 37

hybrid

Question 38

process in which the resin material is changed from a pliable state into a hardened restoration

Answer 38

polymerization

Question 39

glass ionomer cement

Answer 39

most versatile
binds chemically to tooth
releases fluoride
low solubility

Question 40

when and where you use glass ionomer cement

Answer 40

primary teeth
sealants
final restorations for non-bearing areas class V AND root surfaces

Question 41

supply of glass ionomer type I (power/liquid)

Answer 41

Mixed on a paper pad or on a cool dry glass slab

Question 42

supply of glass ionomer type I (premeasured capsules)

Answer 42

triturated and expressed through a dispenser

Question 43

tooth whitening products

Answer 43

peroxide based gel

gel comes in 10, 16, 22 % concentration

Question 44

precautions to follow when using light cure

Answer 44

use protective sheild
dispense materials
THE DARKER THE SHADE, THE LONGER THE CURING TIME

Question 45

Contradications for using composite resins

Answer 45

when aesthetics not important
pt who do not have daily oral hygiene
cost