Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Dental Materials 2 > Resin Composites 1 > Flashcards

Resin Composites 1 Flashcards

1
Q

What are Silicates

A

earliest tooth coloured restorative material

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

what si the reaction to get a silicate

A

acid base reaction (=salt and water) between

aluminosilicate glass and phosphoric acid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

what are some properties of silicate

A

releases fluoride
moisture resist
erosion prone
brittle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what do acrylics come as

A

powder:liquid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

what is the setting reaction for acrylics

A

free radical addition polymerisation chemical set so working time limited

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what is the power used to make acrylics

A

Pmma beads
chemical initiator
pigment

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

what si the liquid used in acrylics

A 
Mma monomer 
chemical activator (tertiary amine)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What are the steps assc with the free radical addition polymerisation recation

A

activation
initiation
propagation
termination

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

how does termination of free radical addition polymerisation come about

A

attatch to impurity/free radical or further growing chain

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what happens to the material when polymerisation takes place

A

contracts

exothermic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

what happens when tertiary mania not all used up

A

poor colour stability (clear-brown)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

what are acrylics like compared to silicate

A 
less prone to erosion
less soluble
less brittle
less acidic 
lower thermal diffusely
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

how can acrylics irritate the pulp

A

due to residual Mma

interaction with eugenol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

what was introduced to acrylics to reduce the shrinkage

A

inert filler particles to reduce shrinkage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

what does a basic composite contain

A

BIS GMA matrix
coupling agent
filler particles

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

what is a resin composite

A

combination of two comically different materials have props together couldn’t alone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

what si the modern way of curing

A

light cuming for command curing

18
Q

what is the BIS GMA matrix

A

methacrylate based

comonomer such as TEGMA

19
Q

what does th matrix do

A

controls the viscosity (TEGMA)

inhibitors

20
Q

what is the viscosity of the matrix polymer do

A

reduces mobility of unreacted monomers

21
Q

unreacted monomers means what

A

chair side repair

C=C takes part in free radical addition poly

22
Q

in new products siloranes what happens in setting

A

ring opening

= initial expansion overall contraction

23
Q

what are some examples of siloranes

A

siloxanes - hydrophobic

oxiranes - ring open poly

24
Q

what are some points about cationic curing used for silorane

A 
camphorquinone 
iodimum salt
electron donor
ring open poly 
less shrinkage
25
Q

what is camphorwuinone

A

photosensitised

26
Q

what does the electron donor do in cationic curing

A

decomposes iodiumum salt to an acidic cation

27
Q

what are some fillers

A

quartz
silica
glasses ( aluminosilicates, boro silicate, barium oxide)

28
Q

what is a common coupling agent

A

(delta- meathacryloxypropyltimethoxysilane)

29
Q

what is the properties of coupling agent

A

difunctional
methacrylate characteristics
silane interacts and bonds with glass
good wetting

30
Q

what are the means of chemical activation for rein comps

A

chemical

  • powder liquid
  • paste liquid
  • encapsulated
31
Q

what is the means of light curing for resin comps

A

UV not any more
camphorquinone
- protects eyes

32
Q

what does camphorquinone do

A

yields necessary free radicals for poly

visible in blu light

33
Q

what does the coupling agent do

A

tranfers stresses generated under loading form rigid and brittle filler to more flexible and ductile polymer matrix

34
Q

filler may be added as a

A

shock abs

35
Q

what are types of resin composites

A

microfilmed
conventional
hybrid
nancomposites

36
Q

what are some handling characteristics

A

packable
- v viscous
flowable
- more fluid less filler

37
Q

what is a type 1 restoration

A

restroe cavs involving occlusal surfaces

38
Q

what is a type2 restoration

A

restore cav medial/distal ad occlusal surface

39
Q

what is triboloy

A

changes with function and loss of resin rich outer layer

40
Q

what sit he thermal property proportional to

A

to filler content

as filler inc coif of thermal expansion dec

41
Q

what is mechanical dept on

A

filler content type and type
efficiency of coupling
degree of porosity

42
Q

does cav shape influence overall success of restoration

A

yes

c = no. bonded surfaces/ no. unbounded surfaces

Dental Materials 2 (8 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions