Zinc oxide eugenol cement

Presentation, Availability
Types, Uses, Composition,
Manipulation, Setting reaction and
Properties

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Zinc oxide eugenol cement
Professor
DR. Tahir Ali Khan

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Age is no guarantee of maturity

3. Objectives
At the end of this lecture the student
will be able to know
The Zinc Oxide Eugenol Cement in
detail related to its
Presentation, Availability
Types, Uses, Composition,
Manipulation, Setting reaction and
Properties
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Since 1890,s zinc oxide based cements are in use
extensively
The most biocompatible among cements
Have obtundant effect on the exposed dentin
Have low strength

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Availability/Presentation
Bottles & Tubes
Powder / Liquid
Paste / Paste

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Applications
1. Temporary and permanent cementation
of restorations
2. Temporary filling of teeth
3. Cavity liner or base
4. Pulp capingagent
5. Secondary use: Root canal sealer

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8. Types
Type I: For temporary cementation
Type II ZOE: Permanent Cementation
Type III ZOE: Temporary filling and
thermal base
Type IV ZOE: Cavity Liners
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9. 1. The simple zinc oxide eugenol
combination that may contain setting
accelerators
2. The reinforced zinc oxide eugenol
cements
A. The EBA reinforced cements
B. Resin reinforced cements
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Composition
Powder
Zno
Function: Primary reactive ingredient
Zinc acetate (1-5 %)
Function: Accelerator
Liquid
Eugenol
Function: primary reactive ingredient
Olive oil (5-15 %)
Function: To control viscosity

13. Composition
Powder
Zinc oxide 69% Principal ingredient
White rosin 29.3% To reduce the brittleness of the
set cement
Zinc stearate 01% Accelerator, Plasticisor
Zinc acetate 0.7% Accellarator, improves strength
Magnessium oxide is added in some product to
react with Eugenol in a similar passion as Zinc
oxide
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14. Liquid
Eugenol 85% React with zinc oxide
Olive oil 15% Plasticisor
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Setting reaction
ZINC OXIDE + Water → ZINC HYDROXIDE
ZINC HYDROXIDE + EUGENOL → ZINC EUGENOLATE
+ Water

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The Chelate formed is an amorphous gel that
tends to crystallize imparting strength to the set
mass
Structure of set cement:
The set cement consists of particles of zinc oxide
embedded in a matrix of zinc eugenolate

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The reaction is reversible
The zinc eugenolateis easily hydrolized
Thus cement disintegrates rapidly when
exposed to
oral conditions
Heat and water accelerates the reaction

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Properties
Manipulative properties
The setting characteristic are to some extent ideal
An adequate working time
During which very little increase in viscosity occurs,
coupled with setting after placing into the cavity
Sets quickly in oral cavity (higher
temperature and humidity comparatively)

19. FACTORS AFFECTING SETTING TIME
Particle size:
Smaller zinc oxide particles set faster
Powder to liquid ratio
Higher the ratio, faster the set
Addition of accelerators (Alcohal,Glacial acetic acid and Water
makes the cement set faster)
Cooling the glass slab: Slows the reaction
Addition of Glycol and Glycerine: act as retarders
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20. Mechanical properties
Compressive strength –relatively weak cements
ranges from a low of 3 to 4 MPa up to 50-55 Mpa
Typically 20MPa is for un-reinforced
The ultimate compressive strength is lower than
Zinc phosphate cement
Tensile strength –ranges from 0.32 to 5.3MPa
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Biological properties
pH during placement is 7
Can be used in deep cavities without
harming the dental pulp
Unconsumed Eugeolirritant under certain
conditions
Eugenol has an abtundanteffect
(CONT)

22. Free eugenol is bactericidal
Helps to minimize the effects of
bacterial ingress and production
of exotoxins
Causing pulpal damage as a
consequence of micro leakage
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Solubility
Set cement is highest among the cements
(0.4% -wt)
Due to leaching of Eugenol
Leached eugenol replaced by water
Hydrolysis and disintegration of the cement
structure
Not suitable as permanent luting agent

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Effects on filling materials
Effect on resin based filling material
Interfere the polymerization process
Softening of the surface of the composite
Discoloration

25. Thermal properties
Excellent thermal insulating properties
Form an effective barrier under metallic
restoration
The thermal diffusivity is similar to that
of dentine
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26. Adhesion
Not adhesion to the enamel and
dentin
This is one reason why they are not
often used for final cementation of
crowns and bridges
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Manipulation
Armamentarium:
Powder, Liquid
Mixing pad
Spatula (use stiff side , not flexible side)

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Manipulation
Shake the powder bottle for even
distribution of
Powder / liquid ratio 3 or 4 :1
Incorporate half of the powder into the
liquid and fold it in using the stiff side
of the mixing spatula and applying
heavy force to ensure an even mix
Add the remainder of the powder,
folding in

31. The final mixture should be Putty-like;
It should be tacky but malleable, and
stiff enough to be properly condensed
when placed.
Roll the mixed cement into a long roll
and cut it into small pieces using the
spatula
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Manipulation of Paste / Paste system
Equal lengths of the accelerator and
base pastes are dispensed on a
mixing pad or glass slab
The pastes are colored differently
Mixing should continue until a uniform
color is achieved

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EBA re-enforced cements
Presentation: Powder / Liquid
Composition
Powder
Zno 60%
Function: Primary reactive ingredient
Quartz 35%
Function: reinforcing agent
Hydrogenated rosin 5 %
Function: reinforcing agent

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EBA re-enforced cements
Liquid
Ethoxybezoic acid 62.5 %
Function: Reactive ingredient
Eugenol 37.5 %
Function: Reactive ingredient

35. Properties
The setting characteristics similar to Zno
Eugenol cements
The set material is stronger
Compressive strength up to 85 MPa
Lower solubility comparatively
Thermal property are similar to that Zno
Eugenol cements
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36. Application
Cavity liner
Luting agent
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37. Polymer reinforced Zno Eugenol cement
Why introduced
To increase the strength of Zo-E
Contains Zinc Oxide and finely
divided natural or synthetic resin (poly
methyl methacrylate)
Resulting in good strength, improved
abrasion resistance and increased
toughness
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38. Applications
Luting agent
Base
liner
Temporary filling material
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Polymer reinforced zno eugenol cement
Presentation
Powder / Liquid
Composition
Powder
Zno 80 %
Acrylic resin 20 %
Liquid
Eugenol

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41. Non Eugenol Zinc Oxide cement
Suitable For patients
Sensitive To Eugenol
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