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Zinc Oxide Eugenol Cement (ZOE) (Classification depend on use (type 2:…
Zinc Oxide Eugenol Cement
(ZOE)
Classification
depend on use
type 2: for definitive luting
type 3: for temporal tilling and bases
type 1: for provisional luting
type 4: for cavity liner
Properties
Hardening time ↑ (more liquid)
Physical factors
change grain thickness
less powder
Chemical factors
accelerators: zinc acetate
humidity in the room (oral cavity)
No mechanical physical properties
same as ZPC
Solubility: slightly soluble
Conductivity
good isolating material
thermal conductivity similar to dentine
Mechanical
Compression resistance: ZPC > ZOE
Pulling resistance: low, easy to remove
Toughness: only cement better than CH
No Bonding
=> don't use in definitive material
Chemical and Biological
Biocompatibility
depend on how depth/ grade to pulp
contact to dentine, far from pulp
--> sedative, analgesic effect
pulp exposure: irritation
Germicide affect
due to eugenol
react with composite resins
--> affect polymerization
neutral pH
Composition and Hardening
Composition
powder: zinc
liquid: eugenol
Hardening
obtain eugenate or zinc eugenolate
acide-base reaction
accelerate with water
no exothermic
setting time: 2-10 mins
Handling/ Indications
Indications
Provisional restoration (temporary filling): type 3
due to sedative, germicidal and insulating effect
Bases and cavity liner: type 4
due to great insulating
Luting
provisional: type 1
definite: type 2
(have better material)
Special applications
surgery cement
filling material for temporary teeth,
after apply formocresol in pulpotomy
Handling
Dosage
type 1
paste- paste (1:1)
--> provisional luting
type 2
powder- liquid (3:1)
--> definitive luting
Mixture
unnecessary to use cold glass tile
(no exothermic)
difficult to clean when harden
cover lips with silicone grease
use alcohol to clean