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Dental material > Dental pt2 > Flashcards

Dental pt2 Flashcards

1
Q

Func dental cements

A

luting agent (bonding material)
cavity liners
restorative materials

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2
Q

Charac cement

A

multipurpose material

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3
Q

Types cement

A

diff cement - diff application - diff physical prop, appropriate clinical manipulative charac

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4
Q

Cond acceptable performance luting, restorative cement

A

NO dissolution oral envi
strong bond - mech interlocking, adhesion
high strength tension, shear, compression
high fracture toughness
good biocompatibility

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5
Q

Types cements based on matrix forming species

A
  1. Phosphate
    a. Zn phosphate
    b. Zn silica phosphate
  2. Phenolate
    a. ZnO eugenol: Simple ZnO eugenol, reinforced ZnO eugenol, EBA ethoxy benzoic acid (Phenolate -> phe -> E -> eugenol)
    b. Ca(OH)2 salicylate (pheNO -> OH -> Ca(OH)2)
  3. Polycarboxylate
    a. Zn polycarboxylate
    b. Glass ionomer
  4. Acrylate
    a. Polymethylacrylate
    b. Dimethylacrylate: filled, unfilled
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6
Q

Kelate forming rxn

A

Phosphate
Phenolate
polycarboxylate

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7
Q

Free radical poly

A

acrylate

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8
Q

Use of Zn phosphate cement

A

luting agent
cavity liners

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9
Q

Zn phosphate compo.

A

powder:
ZnO
MgO
Ca(OH)2
pigments
(phOs -> lots of O -> ZnO, MgO, Ca(OH)2)

liquid:
H3PO4
H2O
(phosphate -> phosphoric -> H3PO4 -> have acid, need H2O)

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10
Q

Zn phosphate formation need

A

Al low level need for formation
Zn: moderator

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11
Q

Zn phosphate cement rxn

A

ZnO + H3PO4 -> amorphous Zn phosphate + ZnO core

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12
Q

Properties, manipulation Zn phosphate cement

A

far from ideal - use as standard against new cements
easy manipulation
(1st one of the list -> use as standard)

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13
Q

Properties strength Zn phosphate cement

A

increase powder p/l - increase strength
recommended p/i ratio: 2.5-3.5g/ml
24h -> min comp strength: 60mpa
(Zinc -> ring -> ring bell -> Lorelai ring -> 25-35 yrs old - dinner 60min -> min comp strength:60MPA)

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14
Q

Properties solubility Zn phosphate cement

A

23h -> solubility in distilled H2O (0.04-3.3%) for inferior meterial
standard solubility: 0.2%
solubility oral cond: 20-30X >

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15
Q

Properties dimensional change Zn phosphate cement

A

dimensional change -> slits at tooth - cement; cement - restorations interfaces

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16
Q

Properties pH Zn phosphate cement

A

freshly mixed: 1-2
setting time: 1-7
1h -> ph4
24h -> ph6-7
(less chua)

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17
Q

Effect of low pH

A

free acidity mix + osmotic movement fluid thru dentinal tubules -> pain

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18
Q

Prolomged pulpal irritation

A
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19
Q

Ad, disad Zn phosphate

A

mixed easily
strong mass from fluid consistency
pulp irritation
NO antibacterial action
brittleness
NO adhesion tooth structure
solubility oral fluids

(first one on the list -> NO antibacterial, pulp irritation)

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20
Q

Types modified Zn phosphate cement

A

Cu
Ag - silver phosphate
F
Si - silicophosphate - silica glass cement

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21
Q

Cu modified Zn phosphate cement

A

Cupric oxide CuO
Cuprous oxide Cu2O
Cuprous iodid
Cuprous silicate

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22
Q

Effect Cu modified Zn phosphate cement

A

highly acidic
-> higher pulpal irritation
higher solubility
lower strength
(Cu - in acid - high acidic - high solubility -> less strength)

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23
Q

Effect F modified Zn phosphate cement

A

stannous
in orthdontic cement
higher solubility
lower strength
reduce enamel solubility
anticariogenic effect
(F fluoride -> good for teeth -> anticariogenic -> reduce enamel solubility - still high solubility, low strength)

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24
Q

Simple ZnO Eugenol phenolate based cement use

A

temporary cementation
cavity liner (pediatric dentistry)

(simple , reinforced -> temporary, for kids - cavity liner)

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25
Q

Composition simple ZnO Eugenol phenolate based cement

A

powder: pure ZnO aka setting accelerators
liquid: purified ZnO + accelerator (alcohol/ acetic acid)

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26
Q

Rxn simple ZnO Eugenol phenolate based cement

A

ZnO + eugenol -> + H2O -> Zn eugenolate (eugenate)

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27
Q

Volumetric shrinkage ZnO Eugenol phenolate based cement

A

0.9%

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28
Q

Thermal expansion ZnO Eugenol phenolate based cement

A

3510^06/Celsius
(around normal temp10^6)

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29
Q

Biologic effect ZnO Eugenol phenolate based cement

A

deep cavity: anodyne (reduce pain) effect on pulp
direct contact CT: irritant
eugenol: allergen
(eugene - helps heal mentally but irritates physically aka deep cavity - anodyne effect ; direct contact CT: irritant, eugenol: allergen)

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30
Q

Ad simple ZnO Eugenol phenolate based cement

A

good sealing
resistance marginal penetration
obtundent effect pulp tissue

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31
Q

disad ZnO Eugenol phenolate based cement

A

low physical prop
(eugene -> cold -> low temp -> low physical prop)

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32
Q

use reinforced ZnO Eugenol phenolate based cement

A

luting agent (except later restoration)
temporary filling material
cavity liners
(reinforced -> more complicated -> can be used as luting)

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33
Q

Composition reinforced ZnO Eugenol phenolate based cement

A

(same as simple but powder have PMMA, pine resins; liquid have antimicrobial agents)

powder: pure ZnO aka setting accelerators + pine resins, PMMA
liquid: purified ZnO + accelerator (alcohol/ acetic acid) + antimicrobial agents

34
Q

Solubility reinforced ZnO Eugenol phenolate based cement

A

have resins -> lower solubility than simple
(reinforced -> attached -> less move -> less solubility than simple)

35
Q

Setting rxn reinforced ZnO Eugenol phenolate based cement

A

kelate forming rxn

36
Q

Manipulation reinforced ZnO Eugenol phenolate based cement

A

more power needed

37
Q

Ad, disad, biologic effect reinforced ZnO Eugenol phenolate based cement similar to simple

38
Q

Ca(OH)2 ZnO Eugenol phenolate based cement use

A

cavity liner
(Ca -> cavity liner)

39
Q

composition Ca(OH)2 ZnO Eugenol phenolate based cement

A

2 pastes system
1. Ca(OH)2 + ZnO + Zn/F salts in ethylene toluoene sulphonamide
2. CaS + TiO + CaTg in liquid disalicilate ester of butane 1,3 diol
(Ca -> 2 letters -> 2 pastes
-> salts to clean -> soap -> sulphonamide -> ethylene toluoene sulphonamide
-> Some Tik Tok to die -> CaS + TiO + CaTg - liquid disalicilate ester butane 1,3 diol)

40
Q

effect Ca(OH)2 ZnO Eugenol phenolate based cement

A

alkaline pH -> antibacterial, remin

41
Q

Rxn Ca(OH)2 ZnO Eugenol phenolate based cement

A

Ca(OH)2 + ZnO + salicilate ester -> chelate

42
Q

Working time, setting time Ca(OH)2 ZnO Eugenol phenolate based cement

A

working: 1-2min
setting: 3-5min

43
Q

Strength Ca(OH)2 ZnO Eugenol phenolate based cement

A

increase time - increase compressive, tensile strength
(Ca -> C: clock, compressive -> increase time -> increase compressive, tensile)

44
Q

solubility Ca(OH)2 ZnO Eugenol phenolate based cement

A

soluble in acid (50% during acid etching)
(CaOH -> alkaline -> soluble in acidic)

45
Q

Biologic effect Ca(OH)2 ZnO Eugenol phenolate based cement

A

neutralize, prevent passage acid -> barrier to penetration ex methyl metacrylate -> pulp protection

(Ca -> công an -> protect -> pulp protection)

46
Q

Ad, disad Ca(OH)2 ZnO Eugenol phenolate based cement

A

Ad:
easy manipulate
rapid hardening
dentin protective
pulp protective

disad:
low strength
moisture -> weaken
acidic cond. -> dissolve

47
Q

Composition Zn polycarboxylate

A

powder: ZnO + MgO/SnO + AlO +F -> improve mech prop (POLYcarboxylate -> aka many -> many O -> ZnO+MgO/SnO+AlO)
liquid: polyacryl acid

48
Q

Rxn Zn polycarboxylate

A

ZnO + Polyacryl acid -> Zn polyacrylate (gel like matrix)

49
Q

Rate setting Zn polycarboxylate depends on

A

p/l ratio
particle size
rxtivity ZnO
additives
molecular weight, conc polyacryl acid

(polycarboxylate - poly aka many criterias -> deal w/ physically: p/l ratio -> additives -> rxtivity ZnO -> conc polyacryl acid -> particle size)

50
Q

p/l ratio Zn polycarboxylate

51
Q

Working time, setting time Zn polycarboxylate

A

working: 2.5-3.5min (cold slab -> increase working time)
setting: 6-9min

52
Q

strength Zn polycarboxylate

A

compressive, tensile strength increase with
p/l ratio (PolyCarboxylate -> p -> depends on p/l -> increase p/l increase Compressive)
additives: Al, F

53
Q

strength after setting period Zn polycarboxylate

A

decrease strength

54
Q

solubility Zn polycarboxylate

A

in distilled H2O: 0.1-0.6%

55
Q

Bonding prop Zn polycarboxylate

A

bond to clean enamel, dentin - thru calcium complexation
bond to clean alloys
bond bad if debris, contamination

56
Q

bond strength related to strength cement

57
Q

Ad, disad Zn polycarboxylate

A

Ad: low irritancy
adhesion tooth substances, alloys
easy manipulation
prop comparable to Zn phosphate cement
Disad:
short working time
need accurate p/i

58
Q

Glass ionomer cement polycarboxylate use

A

cavity liner
restorative, core buildup
cementation cast alloys, porc restoration, orthodontic bands

59
Q

Compostion Glass ionomer cement polycarboxylate

A

Powder: Ca-Al-F-Si glass + ZnO + Ag (glAs ->Ag)
Liquid: polyacrylic acid PAA, itaconic acid, tartaric acid

(clean glass using acid -> polyacrylic acid, itaconic acid, tartaric acid)

60
Q

Size powder Ca-Al-Si-F Glass ionomer cement polycarboxylate

A

ZnO size filling: 40um
ZnO size luting: 25um

61
Q

Setting rxn Glass ionomer cement polycarboxylate

A

Poly acrylate + Ca-Al-F-Si -> Ca polycarboxylate + Al polycarboxylate

62
Q

Rxn type Glass ionomer cement polycarboxylate

A

light cured by methacrylate group

63
Q

ad of light cured Glass ionomer cement polycarboxylate

A

water resistance
strength

64
Q

manipulation Glass ionomer cement polycarboxylate

A

handmixed/ encapsulated/ mech mixed/ injected proportional p/l

65
Q

manipulation Glass ionomer cement polycarboxylate p/l

A

accurate amount for optimal prop

66
Q

manipulation Glass ionomer cement polycarboxylate setting time

A

luting material: 6-9min
lining material: 4-5min
restorative material: 3-4min
light curing material: 30s

67
Q

manipulation Glass ionomer cement polycarboxylate strength

68
Q

manipulation Glass ionomer cement polycarboxylate solubility

A

good resistance oral cond.

69
Q

biologic effect Glass ionomer cement polycarboxylate

A

pulpar response favorable
cariostatic effect (b/c Leaching F)
antibacterial effect (b/c low pH, leaching Silver, others)
(glass is good - antibacterial, cariostatic, pulpal favorable)

70
Q

ad, disad Glass ionomer cement polycarboxylate

A

ad:
easy mixing
high strength
good adhesion (can stick anything on glass)
release fluoride
translucent
disad:
long setting time
moisture sensitive
cause pulp sensitivty

71
Q

Types polymer based cements aka acrylate

A
  1. methyl methacrylate PMMA
  2. aromatic dimetacrylate BisGMA
72
Q

Use polymer based cements aka acrylate

A

cementation restoration, facing, temporary crowns

(acrylate - unusual name during classification -> unusual func too -> cementation restoration, facing temp crowns)

73
Q

composition polymer based cements aka acrylate

A

powder: PMMA + benzoyl peroxide (initiator) + pigments
liquid: MMA monomer + accelerator

74
Q

setting polymer based cements aka acrylate

A

monomer dissolves -> softens poly -> free radical poly from peroxide amine interxn

75
Q

ad, disad polymer based cements aka acrylate

A

ad:
high strength
low solubility
disad:
pulp irritation
short working time
hard remove excess cement
careful mixing -> NO air bybbles
sensitive to moisture

76
Q

Dimethacrylate cement types

A

auto cure
light cure
dual cure

77
Q

use Dimethacrylate cement

A

cementation fixed denture
(dimethylcrylate - die - use till die -> cementation fixed denture)

78
Q

composition Dimethacrylate cement

A

paste1: silica glass + benzoyl peroxide (initiator)
paste2: bisGMA + UDMA mono + tri amine (promoter) + (light sensitive promoter in dual)

79
Q

effect mixing Dimethacrylate cement

A

high amounts cross linked formed

80
Q

manipulation Dimethacrylate cement

A

ratio 1:1
optimal prop after 10min light curing
best in ceramic restoration

81
Q

ad, disad Dimethacrylate cement

A

ad:
high strength
low solubility
high bonding ceramic, enamel/dentin
disad:
complicated
pulpal sensitivity
hard remove excess

Dental material (7 decks)

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