Brainscape's Knowledge GenomeTM

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


See full index

Dental Materials > Materials for luting and Adhesion > Flashcards

Materials for luting and Adhesion Flashcards

1
Q

what are the objectives of cementation and luting?

A
  • maintain restoration in place

- maintain integrity of remaining tooth structure

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

cementation retention is achieved by what four things?

A

friction
adhesive joint
the cement
the restoration

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

what two things does an effective interfacial seal depend on?

A
  • ability of the cement to fill the irregularities between the tooth and the restoration
  • resist the oral environment
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

the classification of luting agents is according to what?

A

the length of time that they are expected to stay in function and setting.

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

what is a provisional luting agent?

A

stays in mouth for a short period of time

low strength and easy handling, no irritation of pulp.

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

what are examples of provisional luting agents?

A

zinc oxide, non-eugenol cements and calcium hydroxide pastes

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

what is a definitive luting agent?

A

remain in function for the longest time possible, must have sufficient properties

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

luting agents of acid based rxn?

A

GI, RMG, zinc oxide-eugenol, zinc polycarboxylate, and zinc phosphate

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

luting agents of polymerization?

A

resin cements, compomers, self-adhesive cements

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

what are some materials that are capable of creating a chemical interaction with hydroxyapatite

A

zinc polycarboxylate (acid)
GI (acid)
RMG (acid)
self-adhesive resin cements (polymer)

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

what Buonocore find in 1955?

A

that acid etching of enamel increases the bond strength of resin to enamel

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

T/F almost half of all restorations placed n general dental practice are done to replace a defective or failed restoration?

A

true

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

what are the three major categories that restorations need to be replaced?

A

clinician factors
material properties
patient factors

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

what is the composition of dentin?

A

50% mineralized apatite crystals
20% water
30% organic matrix (collagen fibrils)

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

what happens to diameter and number of tubules near the pulp?

A

they increase

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

what are some characteristics of sclerotic and caries affected dentin?

A

hypermineralized
tubules occluded with CaPO4 crystals
Acid resistant

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

what happens to dentin collagen fibers if they become too dry?

A

they collapse

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

what is the overwet phenomenon?

A

when a primer is displaced over a water droplet to from a meniscus.
leads to bubbles of the primer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

what does the smear layer composed of?

A 
bacteria
saliva
blood cells
denatured collagen 
*cannot be removed with rinsing
0.5 -2.0 microns thick
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

what is the hybrid layer?

A

the structure formed in hard dental tissues by demineralization of the surface and subsurface, followed by infiltration of monomers and subsequent polymerization.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

what is a resin tag?

A

resin monomers that have infiltrated demineralized dentinal tubules. allows for max bonding

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

what are dentin primers made of?

A 
hydrophilic monomer HEMA
-water soluble solvent
water
acetone
ethanol
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

what are dentin adhesives made of?

A

unfilled or lightly filled resin (Bis-GMA)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

how many steps are in the 4th generation?

A

3
conditioner
primer
adheisive

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

what is the conditioner of the 4th generation?

A

phosphoric acid, removes smear layer

26
Q

what is the primer solvent in the 4th generation?

A

acetone and ethanol

27
Q

in the 5th generation what is the conditioner?

A

phosphoric acid only, removes smear layer

28
Q

in the 5th generation, are the primer and adhesive combined?

A

yes, it is heat sensitive so it needs to be stored in a cool place

29
Q

in the 6th generation what two steps are combined?

A

the conditioner and primer(called a self etching primer.

  • this dissolves the smear layer
  • *acid monomer with water
30
Q

in the 6th generation is the adhesive combined with any other steps?

A

no, it is it’s own step

31
Q

what is the purpose of the primer?

A

to create hydrophilic conditions, to allow adhesive to penetrate the tubules

32
Q

what are the differences between the 4th and 5th generation adhesive systems?

A

-4th gen has primer and adhesive separately
has more steps and more predictable
-5th gen has primer and adhesive mixed together in one bottle
less predictable and more susceptible to differences in wetness.

33
Q

self etching adhesives

A

-big difference in technique
-user friendly, no phosphoric acid
-acidic monomer dissolves smear layer and primes dentin simultaneously
-one or two step systems
6th gen

34
Q

self-etch adhesives latest research with bonding?

A

higher bond strengths in deep dentin than 4th and 5th gen

  • bonds well to cut enamel
  • less pronounced resin tag formation, no real effect on bond strength
  • two step are more predictable than one-step.
35
Q

what is the 7th gen of adhesives?

A

all in one
dissolves smear layer, self etching primer and adhesive all in one bottle.
**NOT recommended.

36
Q

what is always the solvent in 6th gen?

A

water

37
Q

which generation is considered the gold standard?

A

5th generation
single bond plus (3M ESPE)
-ethanol/water; unfilled

38
Q

what is a good 6th gen product?

A

Clearfil SE bond

-water, 10% filled; light cured

39
Q

which generations are called “total etch or etch and rinse”?

A

4th and 5th because you have to rinse the phosphoric acid

40
Q

which generation are called “ self etch”?

A

6th and 7th because the conditioner and primer are in one bottle.

41
Q

in the 7th generation what is the make up of the all in one bottle?

A

ester monomers with grafted carboxylic or phosphate acid groups dissolved in water

42
Q

T/F Most bonding agents are light-cured and contain an activator such as camphorquinone and an orgainc amine?

A

True
camphorquinone is light cured
orgainc amine chemical polymerization

43
Q

in dual cured bonding agents a catalyst is added to promote self-curing along with a light curing chemical? T/F

A

true hence the dual

44
Q

what are some additives put into bonding agents?

A

nanofiller
fluoride
antimicrobial ingredients
or densentitizers (gluteraldyhyde) carcinogenic

45
Q

what is the most important mechanical property among in-vitro research?

A

bond strength

46
Q

why is longevity of bond in general practice on 40% of that achieved in clinical trials?

A

they are set up in ideal situations

extensive controls for experiments

47
Q

where are 95% of secondary caries associated with resin composites located?

A

interproximal areas

48
Q

how can clinical performance be evaluated?

A

postoperative sensitivity
interfacial staining
secondary caries
retention or fracture followed for 18 months

49
Q

how does bonding to enamel occur?

A

micromechanical retention after etching

-bonding penetrates the etched surface and becomes locked into place after polymerization occurs

50
Q

superficial dentin hybrid layer is a form of?

A

intertubular resin infiltration(interaction with collagen)

51
Q

deep dentin hybrid layers are mainly composed of?

A

resin tag formation

52
Q

dentin bonding primers

A

hydrophilic components such as HEMA (wet dentin and penetrate its structure)

53
Q

etching the dentin with phosphoric acid removes the mineral creating what?

A

microsporosites within the collagen network

54
Q

after etching the dentin what is left?

A

50% unfilled space and about 20% remaining water

55
Q

after acid is rinsed, what must be done cautiously?

A

drying so that the collagen doesn’t collapse

56
Q

what does excess moisture tend to do in regards to primer and bonding?

A

dilute the primer and interfere with resin interpenetration

57
Q

what is the hybrid layer?

A

the structure formed in hard dental tissues by demineralization of the surface and subsurface followed by infiltration of monomers and subsequent polymerization

58
Q

what is one of the most challenging problems of adhesive/dentin bonds?

A

durability

59
Q

what are the principles of adhesion?

A

protects the interface of restorations against penetration of bacteria and fluids that can cause recurrent or secondary caries

  • reduces the need of retentive areas in preparation that would require removal of sound tooth structure
  • sometimes strengthen the remaining tooth structure
60
Q

aspects to create any adhesive joint

A

cleanliness of the surface (biofilm, debris, saliva)
smear layer
-these contaminants will reduce the surface energy of the bonding substrate and its wettability

Dental Materials (7 decks)

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