composition:- composition of typical powder and liquid form is 1.)powder contains zinc oxide 2.)liquid contains eugenol
setting :- zno+H2o ----> zn(OH)2 zinc hydroxide react with eugenol to form a chelate water (H2O) is needed to initiate the reaction and is also form as by-product.
setting reaction accelerate by a.)zinc acetate dihydrate b.) high atmospheric pressure
c.)acetic acid
FASTER SETS by ===> high p/L ratio
properties :- 1.) compressive strength ranges from 3-55 Mpa
2.) free eugenal is bactericidal
disadvantage:- Eugenol allergy in some patients
types 4 types
type-1 for temperory cementation
type-2 long term cementation for fixed prosthesis
type-3 temporary fillings and insulating bases
type-4 intermediate restoration.
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