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Fixed Prostodontics > Dental Cements > Flashcards

Dental Cements Flashcards

1
Q

WHY DENTAL CEMENTS?
(4)

A

caries
fractures
misalignment
prolong the life of the pulp in the war against oral bacteria- using protective coatings

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2
Q

prolong the life of the pulp in the war against oral bacteria- using protective coatings
(4)

A

varnish
base
liner
pits and fissure sealants

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3
Q

DENTAL CEMENT

A

substance that hardens to act as a base, liner, restorative material or luting agent (adhesive) to bind devices and prostheses to tooth structure or to each other

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4
Q

WHAT DO WE WANT A DENTAL
CEMENT TO BE?
(10)

A

biocompatible
non corrosive and inert
immune to acid attack
dimensionally stable
sets during the dental procedure
low surface tension; handles and palces easily
adapts and adheres to anatomy
insensitive to moisture during procedure
anti microbial/ F release
radiopaque
cost effective

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5
Q

immune to acid attack

A

insoluble

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6
Q

dimensionally stable
(2)

A

no cracking of tooth or device by expansion
no leaking because of shrinkage

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7
Q

WHAT MECHANICAL PROPERTIES FOR
THE CEMENT ARE NEEDED?
high values needed for:
(3)

A

cyclic fatigue
thermal cycling
strength

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8
Q

strength
(4)

A

tensile
compressive
flexural strength
shear

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9
Q

luting cements
(3)

A

permanent and provisional indirect restorations
ortho brackets
post and cores

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10
Q

restorative materials

A

permanent and provisional direct restorations

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11
Q

cavity liners and bases

A

pulp protection

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12
Q

multiple applications

A

no one cement can fulfill all requirements

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13
Q

LUTING CEMENT/AGENT

A

viscous material that fills the microscopic space between the abutment-prosthesis interface; upon setting, it forms a solid that seals the space and retains the prosthesis

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14
Q

Ideal properties of a permanent
luting agent
(8)

A

deal properties of a permanent
luting agent
1. *Low film thickness (25 m)
2. *Adequate strength (minimum 70 MPa)
3. *Low solubility (0.2% max. @ 24h)
4. *Reasonable setting time (2.5-8.0 min)
5. Adequate working time
6. Biocompatible, does not irritate pulp
7. Cariostatic
8. Adhesion to tooth structure and restorative materials
*ADA and ISO specification requirements

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15
Q

physical bonding

A

very weak interaction, secondary bonds
-van der waals forces, hydrogen bonds

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16
Q

chemical bonding

A

strongest bond, primary bonds
-limited occurrence, dissimilar materials
-ex, composite bond to adhesive bond agent

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17
Q

mechanical bonding

A

interlock undercuts, surface irregularities
-micromechanical retention
-ex: luting agent/tooth/crown, adhesive bond agent/tooth

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18
Q

MICROMECHANICAL RETENTION:
LUTING CEMENT VS ADHESIVE BOND
AGENT

LUTING CEMENT

A

cement locking into microscopic irregularities in prepared tooth surface and the internal surface of the crown
-non resin cements
-very low bond strength, 1-5 mpa

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19
Q

MICROMECHANICAL RETENTION:
LUTING CEMENT VS ADHESIVE BOND
AGENT

ADHESIVE BOND
AGENT

A

enamel: resin tags into etched enamel
dentin: hybrid layer
-interdiffusion or micromechanical interlocking of resin with demineralized collagen of intertubular dentin
-20-30 mpa bond strength

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20
Q

Cement
Setting mechanism

CaOH

A

Acid-base reaction

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21
Q

Cement
Setting mechanism

Zinc oxide (ZO) eugenol
Modified ZO eugenol
ZO non-eugenol

A

Acid-base

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22
Q

Cement
Setting mechanism

Zinc polycarboxylate Acid-base

A

Acid-base

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23
Q

Cement
Setting mechanism

Zinc phosphate

A

Acid-base

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24
Q

Cement
Setting mechanism

Glass Ionomer (GI)

A

Acid-base

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25
Cement Setting mechanism Resin-modified GI
Acid-base AND polymerization
26
Cement Setting mechanism Resin cement (RC) Unfilled or Filled
polymerization
27
LIQUID: ACIDIC COMPONENT (3)
eugenol/noneugenol oils polycarboxylic acid phosphoric acid
28
POWDER: BASIC COMPONENT
zinc oxide (ZO) fluroaluminasilicate (FAS) glass
29
types of luting cements (4)
* ZINC-OXIDE EUGENOL AND NON-EUGENOL CEMENTS (ZO) * POLYCARBOXYLIC ACID CEMENTS * ZINC PHOSPHATE CEMENT * RESIN-BASED CEMENTS
30
* POLYCARBOXYLIC ACID CEMENTS (3)
zinc polycarboxylate cement glass ionomer cement resin modified glass ionomer
31
* RESIN-BASED CEMENTS (3)
resin modified glass ionomer unfilled resin cements filled resin: composite resin cements
32
ZNO-EUGENOL CEMENTS types (3) indications (1)
regular ZEO reinforced ZEO ZEO-EBA temporary/intermediate cementation
33
INC OXIDE EUGENOL CEMENTS (ACID-BASE) composition
powder: zn oxide liquid: eugenol modifications - polymer-reinforced: IRM - EBA, alumina
34
INC OXIDE EUGENOL CEMENTS (ACID-BASE) low strength
ZOE -compressive: 2-15 -tensile: 1-2 ZOE (modified) -compressive: 40-50 -tensile: 3-5
35
INC OXIDE EUGENOL CEMENTS (ACID-BASE) uses
temp or provisional cement and restorations
36
ZINC OXIDE – EUGENOL powder
99% ZnO and radiopaque fillers
37
ZINC OXIDE – EUGENOL liquid
oil of cloves 85% eugenol
38
ZINC OXIDE – EUGENOL rxn products
zinc oxide, zinc eugenolate needs h2o to set
39
ZINC OXIDE – EUGENOL no pulpal irritation
eugenol acts as sedative, obtundent
40
ZINC OXIDE – EUGENOL ZEO unmodified, tempbond
temp cement
41
ZINC OXIDE – EUGENOL ZOE polymer reinforced
IRM -temp cement: decrease retention or increase time -provisional/intermediate restoration
42
ZINC OXIDE – EUGENOL not used prior to resin based permanent cement, why?
43
ZNO-EUGENOL (6)
+ obtundent + slow setting excess eugenol is irritant shrinkage low strength solubility
44
excess eugenol is irritant (2)
cytotoxic potential allergen
45
ZINC OXIDE NON-EUGENOL CEMENTS (4)
temp cement eugenol replaced with other oils used prior to permanent resin based cement tempbond NE
46
tempbond NE (2)
slow set low retention
47
ZINC POLYCARBOXYLATE CEMENT (ACID-BASE) reaciton
zn oxide + polyacrylic acid = zn polyacrylate (powder)
48
ZINC POLYCARBOXYLATE CEMENT (ACID-BASE) low strength (2)
compressive, 55-67 mpa tensile, 6-8 mpa
49
ZINC POLYCARBOXYLATE CEMENT (ACID-BASE) biological considerations (2)
initial pH ~3, similar or lower than Zp PO4 minimal pulp rxn, large molecule not enter tubules
50
ZINC POLYCARBOXYLATE CEMENT (ACID-BASE) dentin bond strength chelation interaction: physical bond:
~2 mpa cement carboxylate and Ca on tooth surface interaction between - and + charges
51
ZINC POLYCARBOXYLATE CEMENT advantages (2)
-low pulpal irritation -adhesion to tooth structure (more with enamel than dentin)
52
ZINC POLYCARBOXYLATE CEMENT disadvantages (3)
-low strength -more viscoelastic -prosthesis dislodgment over time
53
ZINC POLYCARBOXYLATE CEMENT marketed as a temp cement (3)
-ultratemp -can be used prior to resin cement (no poly inhibition) -ultratemp rez: resin based
54
ZINC POLYCARBOXYLATE CEMENT characteristics (6)
oldest, still in use gold standard for new cements easy to manipulate working time: 3-6 min setting time <14 min indications: luting (non adhesive cementation), fixed pros
55
ZINC PHOSPHATE (ZNPO4) CEMENT (ACID-BASE) reaction
zinc oxide (powder) + phosphoric acid (liquid) = zn phosphate
56
ZINC PHOSPHATE (ZNPO4) CEMENT (ACID-BASE)(1878) micromechanical bond to preparation surface and crown internal surface micro-irregularities (3)
no chelation interaction bond strength: 0.5-1.5 mpa preparation retention and resistance form critical
57
ZINC PHOSPHATE (ZNPO4) CEMENT (ACID-BASE) no longer a major luting agent (2)
possible current use: cement retained implant crowns radiographic visibility, easier removal with less damage to implant surface
58
ZN PHOSPHATE CEMENT powder
?75% zinc oxide <13% magnesium oxide
59
ZN PHOSPHATE CEMENT liquid= aqueous solution of
38-59% H3PO4 2-3% AL phosphate <9% zn phosphate
60
ZN PHOSPHATE CEMENT reaction products (3)
amorphous Zn3(PO4)4H2O matrix zinc aluminophosphate matrix residual zno particles
61
ZINC PHOSPHATE exothermic (3)
use chilled glass slab mix over large area of slab mix in increments
62
ZINC PHOSPHATE (3)
exothermic create stringy consistency remove excess after set
63
ZN PHOSPHATE CEMENT (4)
+ thermally protective acidic exothermic rxn some solubility with acids
64
GLASS IONOMER (GI) CEMENT (ACID-BASE) composition
powder: FAS liquid: polycarboxylic acid/h2o
65
GLASS IONOMER (GI) CEMENT (ACID-BASE) strength compressive: tensile:
90-140 mpa 6-7 mpa
66
GLASS IONOMER (GI) CEMENT (ACID-BASE) --- release
fluoride
67
GLASS IONOMER (GI) CEMENT (ACID-BASE) bond strength
3-5 mpa -chelation, cement carboxyl and ca in apatite
68
GLASS IONOMER (GI) CEMENT (ACID-BASE) posts cementation hypersensitivity brands (2)
early protection (varnish to prevent dehydration of initially set cement ketac-cem, glasslute
69
ACID-BASE CEMENT COMPONENTS liquid
acidic component -eugenol/non eugenol oils -polycarboxylic acid -phosphoric acid
70
ACID-BASE CEMENT COMPONENTS powder
basic component -xinc oxide -FAS glass
71
GLASS IONOMER CEMENT
combo of tech of silicate cememnt and polycarboxylate reaction
72
GLASS IONOMER CEMENT glass powder
Ca-F-Al-silicate -optional Ba, Sr for radiopacity -optional Ag, Zn -powder size <25mm
73
GLASS IONOMER CEMENT liquid
water solution of -50% polyacrylic-itaconic copolymer -optional water-soluble polymer -citric, maleic and tartaric acids
74
GI CEMENT (3)
-affixing devices )ortho bands) -fluoride release -requires protection from dilution or evaporation during setting
75
GIC -CLINICAL (7)
fluidity like Zn PO4 chill the powder and slab avoid liquid evaporation remove smear layer created by preparation instruments dont dehydrate tooth protect cement from excess or frequency of H2O during set (apply copalite on exterior) remove excess immediately (avoid adhesion in unwanted areas)
76
RESIN-MODIFIED GLASS IONOMER (RMGI) CEMENT (ACID-BASE + POLYMERIZATION) composition (3)
powder: FAS glass liquid photoactivator (light activated only)
77
RESIN-MODIFIED GLASS IONOMER (RMGI) CEMENT (ACID-BASE + POLYMERIZATION) liquid
polycarboxylic acid/h2o resin monomers, vary with products -hema, bis-GMA -replace some of the h2o of conventional GI
78
RESIN-MODIFIED GLASS IONOMER (RMGI) CEMENT (ACID-BASE + POLYMERIZATION) setting reactions (2)
acid base rxn monomer polymerization: light, chemical, dual activated
79
RMGI CEMENT strength
compressive: 150-200 tensile: 13-24
80
RMGI CEMENT fluoride release from....
81
RMGI CEMENT bond strength
5-10 mpa
82
RMGI CEMENT powder/liquid system potential for brands (3)
dispending error rely z, fuji plus, CX plus
83
RMGI CEMENT paste/paste systems (6)
2 tube dispenser mix on pad quicker dispensing less dispensing error mix within 30 s brands: rely x plus, fuji cem
84
CEMENTATION WITH RMGI: POWDER/LIQUID SYSTEM (RELY X) (11)
1. gently shake powder bottle to fluff powder 2. dispense powder before liquid 3. equal number powder scoops and liquid drops (3 scoops for crown, 6 for FPD, 2 abutments) 4. hold bottle vertically to dispense liquid 5. mix powder into liquid within 30 s 6. load the crown with cement (spread cement onto all internal surfaces) 7. working time is 2.5 minutes 8. seat the crown 9. wait at least 3 min after placement 10. after cement is completely set, remove excess (scaler, explorer, knotted floss) 11. gingival crevice, remaining cement (any cement that is not removed will be very irritating to the tissue)
85
8. seat the crown (2)
maintain pressure on restoration while cement is setting maintain dry field: cotton rolls, suction
86
RESTORATION CEMENTATION POTENTIAL PROBLEMS (5)
premature contacts pulpitis loosening of the restoration recurrent caries restoration incomplete seating, often linked to other problems
87
incomplete seating factors (4)
cement viscosity; pseudoplasticity vibration venting, preparation groove seating force
88
cement viscosity; pseudoplasticity
restoration morphology -onlay vs crown, less force required
89
seating force
excess force leads to dentin rebound and potential restoration. dislodgement
90
RMGI INDICATIONS (6)
cavity liners, base pit and fissure sealants core buildups restorative adhesive retrograde root filling materials
91
RMGI INDICATIONS (6)
cavity liners, base pit and fissure sealants core buildups restorative adhesive retrograde root filling materials
92
adhesive (2)
ortho brackets, crowns repair amalgam
93
resin cements (5)
1950s, 1970s based on methyl methacrylate chemical (self) cure light cure dual cure
94
RESIN CEMENTS (12)
looks esthetic, transulcent, shades to match tooth insoluble fast curing or slow curing formulas good for ceramic restorations strong and insoluble shrinkage: leakage higher film thickness more complex clinically incomplete conversion of monomer poorer strength, more irritation odor, allergies wear of resin
95
RESIN CEMENT USES (2)
protheses cementing ortho brackets
96
protheses cementing (3)
metal polymer ceramic
97
COMPOMERS (3)
combo of resin cements with a dash of GIC polyacid liquid monomers and resin monomers (water free) usually light curing

Fixed Prostodontics (19 decks)

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