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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
Composition simple ZnO Eugenol phenolate based cement
powder: pure ZnO aka setting accelerators liquid: purified ZnO + accelerator (alcohol/ acetic acid)
26
Rxn simple ZnO Eugenol phenolate based cement
ZnO + eugenol -> + H2O -> Zn eugenolate (eugenate)
27
Volumetric shrinkage ZnO Eugenol phenolate based cement
0.9%
28
Thermal expansion ZnO Eugenol phenolate based cement
35*10^06/Celsius (around normal temp*10^6)
29
Biologic effect ZnO Eugenol phenolate based cement
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)
30
Ad simple ZnO Eugenol phenolate based cement
good sealing resistance marginal penetration obtundent effect pulp tissue
31
disad ZnO Eugenol phenolate based cement
low physical prop (eugene -> cold -> low temp -> low physical prop)
32
use reinforced ZnO Eugenol phenolate based cement
luting agent (except later restoration) temporary filling material cavity liners (reinforced -> more complicated -> can be used as luting)
33
Composition reinforced ZnO Eugenol phenolate based cement
(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
Solubility reinforced ZnO Eugenol phenolate based cement
have resins -> lower solubility than simple (reinforced -> attached -> less move -> less solubility than simple)
35
Setting rxn reinforced ZnO Eugenol phenolate based cement
kelate forming rxn
36
Manipulation reinforced ZnO Eugenol phenolate based cement
more power needed
37
Ad, disad, biologic effect reinforced ZnO Eugenol phenolate based cement similar to simple
38
Ca(OH)2 ZnO Eugenol phenolate based cement use
cavity liner (Ca -> cavity liner)
39
composition Ca(OH)2 ZnO Eugenol phenolate based cement
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
effect Ca(OH)2 ZnO Eugenol phenolate based cement
alkaline pH -> antibacterial, remin
41
Rxn Ca(OH)2 ZnO Eugenol phenolate based cement
Ca(OH)2 + ZnO + salicilate ester -> chelate
42
Working time, setting time Ca(OH)2 ZnO Eugenol phenolate based cement
working: 1-2min setting: 3-5min
43
Strength Ca(OH)2 ZnO Eugenol phenolate based cement
increase time - increase compressive, tensile strength (Ca -> C: clock, compressive -> increase time -> increase compressive, tensile)
44
solubility Ca(OH)2 ZnO Eugenol phenolate based cement
soluble in acid (50% during acid etching) (CaOH -> alkaline -> soluble in acidic)
45
Biologic effect Ca(OH)2 ZnO Eugenol phenolate based cement
neutralize, prevent passage acid -> barrier to penetration ex methyl metacrylate -> pulp protection (Ca -> công an -> protect -> pulp protection)
46
Ad, disad Ca(OH)2 ZnO Eugenol phenolate based cement
Ad: easy manipulate rapid hardening dentin protective pulp protective disad: low strength moisture -> weaken acidic cond. -> dissolve
47
Composition Zn polycarboxylate
powder: ZnO + MgO/SnO + AlO +F -> improve mech prop (POLYcarboxylate -> aka many -> many O -> ZnO+MgO/SnO+AlO) liquid: polyacryl acid
48
Rxn Zn polycarboxylate
ZnO + Polyacryl acid -> Zn polyacrylate (gel like matrix)
49
Rate setting Zn polycarboxylate depends on
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
p/l ratio Zn polycarboxylate
1.5 : 1
51
Working time, setting time Zn polycarboxylate
working: 2.5-3.5min (cold slab -> increase working time) setting: 6-9min
52
strength Zn polycarboxylate
compressive, tensile strength increase with p/l ratio (PolyCarboxylate -> p -> depends on p/l -> increase p/l increase Compressive) additives: Al, F
53
strength after setting period Zn polycarboxylate
decrease strength
54
solubility Zn polycarboxylate
in distilled H2O: 0.1-0.6%
55
Bonding prop Zn polycarboxylate
bond to clean enamel, dentin - thru calcium complexation bond to clean alloys bond bad if debris, contamination
56
bond strength related to strength cement
57
Ad, disad Zn polycarboxylate
Ad: low irritancy adhesion tooth substances, alloys easy manipulation prop comparable to Zn phosphate cement Disad: short working time need accurate p/i
58
Glass ionomer cement polycarboxylate use
cavity liner restorative, core buildup cementation cast alloys, porc restoration, orthodontic bands
59
Compostion Glass ionomer cement polycarboxylate
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
Size powder Ca-Al-Si-F Glass ionomer cement polycarboxylate
ZnO size filling: 40um ZnO size luting: 25um
61
Setting rxn Glass ionomer cement polycarboxylate
Poly acrylate + Ca-Al-F-Si -> Ca polycarboxylate + Al polycarboxylate
62
Rxn type Glass ionomer cement polycarboxylate
light cured by methacrylate group
63
ad of light cured Glass ionomer cement polycarboxylate
water resistance strength
64
manipulation Glass ionomer cement polycarboxylate
handmixed/ encapsulated/ mech mixed/ injected proportional p/l
65
manipulation Glass ionomer cement polycarboxylate p/l
accurate amount for optimal prop
66
manipulation Glass ionomer cement polycarboxylate setting time
luting material: 6-9min lining material: 4-5min restorative material: 3-4min light curing material: 30s
67
manipulation Glass ionomer cement polycarboxylate strength
68
manipulation Glass ionomer cement polycarboxylate solubility
good resistance oral cond.
69
biologic effect Glass ionomer cement polycarboxylate
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
ad, disad Glass ionomer cement polycarboxylate
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
Types polymer based cements aka acrylate
1. methyl methacrylate PMMA 2. aromatic dimetacrylate BisGMA
72
Use polymer based cements aka acrylate
cementation restoration, facing, temporary crowns (acrylate - unusual name during classification -> unusual func too -> cementation restoration, facing temp crowns)
73
composition polymer based cements aka acrylate
powder: PMMA + benzoyl peroxide (initiator) + pigments liquid: MMA monomer + accelerator
74
setting polymer based cements aka acrylate
monomer dissolves -> softens poly -> free radical poly from peroxide amine interxn
75
ad, disad polymer based cements aka acrylate
ad: high strength low solubility disad: pulp irritation short working time hard remove excess cement careful mixing -> NO air bybbles sensitive to moisture
76
Dimethacrylate cement types
auto cure light cure dual cure
77
use Dimethacrylate cement
cementation fixed denture (dimethylcrylate - die - use till die -> cementation fixed denture)
78
composition Dimethacrylate cement
paste1: silica glass + benzoyl peroxide (initiator) paste2: bisGMA + UDMA mono + tri amine (promoter) + (light sensitive promoter in dual)
79
effect mixing Dimethacrylate cement
high amounts cross linked formed
80
manipulation Dimethacrylate cement
ratio 1:1 optimal prop after 10min light curing best in ceramic restoration
81
ad, disad Dimethacrylate cement
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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