ZINC OXIDE EUGENOL

- PRESENTED BY ROSHNI MAURYA

IntroductionZinc Oxide – Eugenol (ZOE) Impression PasteZinc Oxide –Eugenol (ZOE) CementZinc Oxide – Eugenol (ZOE) Filling materialPeriodontal Pack

Zinc oxide-eugenol impression paste

For full arch edentulous impression without or minor undercut.

wash impression surgical paste

Bite registration paste

Zinc oxide-eugenol Impression paste

Composition (base) TUBE I

Zinc oxide (ZnO) 87% Oil( FIXED VEGETABLE/MINERAL) 13%

Composition (reactor) TUBE2

Eugenol 12~15% Oil Rosin 50% Filler (kaolin) 20% Resinous balsam 10% Acc. Soln(Cacl2), color 5%

Non eugenol paste Carboxylic acids

Zinc oxide-eugenol Impression paste

Reaction

ZnO + eugenol Zn eugenolate + ZnO(unreacted)

(powder) (liquid)

(Solid)

Properties@ Very low viscosity

@ Low dimensional change0.1%

@ Irreversible chemical change

Disinfection : 2% alkaline glutarldehyde solution

Manipulation

Equal length of the two paste is extruded

shorten by increase

Temperature&Humidity

Working time 3-5 min Mixing time 45-60 s

Mixed with stainless steel spatula in paper pad or glass slab

Materials are classified as: HARD PASTE(TYPE 1) SOFT PASTE(TYPE 2) FINAL SETTING : Type 1: within 10 mins Type 2 : 15 mins

Manipulation

Advantage

Accuracy of soft tissue impression (mucostatic)

Inexpensive Adhere well to dental compound

Good surface detail reproduction Good dimensional stability

Disadvantage

May irritating to soft tissue

Inadequate working or setting time-excessive humidity and/or temperature

Distortion-unstable tray

ZINC OXIDE EUGENOL CEMENT ZOE cement introduced in 1858, is used as a Protective , sedative lining in deep carious

cavities, For temporary filling

Temporary cementing Pulp capping Root canal filling Periodontal / surgical packing Depending on their use they vary widely in their

properties. In general, they are cements of low strength, are least irritating of all dental cements, are known to have an obtundant effect on exposed dentin.

CLASSIFICATION: (ADA SP. NO. 30) 4 TYPES

TYPE 1 ZOE- for temporary cementation TYPE II ZOE – permanent cementation TYPE III ZOE – temporary filling, thermal

insulation TYPE IV ZOE – cavity liners

AVAILABLE AS : Powder, liquid Two paste system

COMMERCIAL NAMES Unmodified Tempac - type III Cavitic - type IV Tempbond - type I

EBA alumina modified Opotow Alumina EBA - type II

Polymer modifies Fynal - type II IRM - type III

Non- eugenol Nogenol - type I Freegenol - type I

COMPOSITION POWDER Zinc oxide – 69.0% - principal ingredient White rosin - 29.3% - To reduce brittleness of set cement Zinc stearate -1.0% - Accelerator , plasticizer Zinc acetate – 0.7% - Is added in some powders, acts with

eugenol in a similar manner as zinc oxideLIQUID Eugenol – 85.0 - Reacts with zinc oxide Olive oil - 15.0 - Plasticizer

Zinc oxide is also main constituent of gutta-percha points mainly used in endodontic root canal filling, commonly known as GP Points.

Setting reaction First

ZnO + water Zn(OH)2

SecondZn(OH)2+2HE ZnE2 + H2O

SETTING TIME : 4 - 10 mins

Water accelerates the reactionZinc eugenolate is easily hydrolyzed by moistures

Factors affecting setting time

Complete reaction between zinc oxide and eugenol takes about 12 hrs. this is too slow for clinical convenience.

Manufacture: most active ZnO powders are those formed from zinc salts like zinc hydroxide, zinc carbonate by heating at 3000 degree Celsius.

Particle size : smaller particles sets faster. Accelerators : Alcohol, glacial acetic acid, water Heat : cooling glass slab, slows reaction Retarders : the set can be treated with glycol ,

glycerin p/l ratio : higher the ratio, faster the set.

PROPERTIES MECHANICAL PROPERTIES: Compressive strength : are relatively weak cements.

Ranges from a low of 3 -4 Mpa upto 50-55 MPa. Tensile strength : 0.32- 5.3 MPa Modulus of elasticity : 0.22 – 5.3 GPa

THERMAL PROPERTIES: Thermal conductivity : 3.98[Cal. Sec-1 cm-

2]x 10-4 Co-efficient of thermal expansion :

35x10-6/celsius

Solubility and Disintegration : solubility is highest among cements (0.4 wt %) . Disintegrate in oral fluids. Solubility is reduced by increasing p/l ratio.

Film thickness :is 25 um, is higher than other cements.

Adhesion : do not adhere well to enamel or dentin

Biological properties : PH and effect on pulp: PH is 7 -8 ; pulpal

response classified as mild Bacteriostatic and obtundant properties Optical properties : set cement is opaque

Specification requirements

Type Setting time [min]

Compressive strength[MPa]

Solubility[%]

Film thickness[µm]

Type I 4-10 35 maximum 2.5 25Type II 4-10 35 maximum 1.5 25Type III 4-10 35 maximum 1.5 -

MANIPULATION P/L SYSTEM: p/l ratio : 4:1- 6:1 by wt Oil of orange is used to clean eugenol

cement from instruments.

TWO PASTE SYSTEM: equal lts. Of each paste are dispersed and mixed until a uniform color is observed.

SETTING TIME :4-10 MINS ZOE cements set quickly in mouth due to

moisture and heat.

25

26

Zinc oxide eugenol

MODIFIED ZOE CEMENTS Introduced to improve mechanical properties of Zoë cement.

Modified ZOE cements are: EBA-Alumina modified cements Polymer reinforced EBA- ALUMINA MODIFIED CEMENTS: COMPOSITION

POWDER : Zinc oxide- 70 %

Alumina- 30 % LIQUID : EBA- 62.5 % Eugenol- 37.5 % PROPERTIES : Better than unmodified ZOE Com. St.- higher 55 Mpa Tensile St.- 4.1 Mpa Modulus of elasticity – 2.5 GPa Film thickness - 25um Solubility, disintegration in water -0.05 %wt

MANIPULATIONGlass slab are recommended for EBA- alumina

modified cements. after dispensing , powder is inco.

Into liquid in bulk, kneaded for 30 secs, and then stropped for an additional 60 secs with broad strokes of spatula to obtain a creamy consistency. They have long working times.

SETTING TIME: 9.5 MINS

Polymer reinforced zoe cement

Composition: POWDER : Zinc oxide- 70 % finely divided natural or synthetic resins LIQUID : Eugenol acetic acid – accelerator Thymol - antimicrobial zinc oxide is surface treated SETTING REACTION: Similar to zoe cements. acidic

resins, if present, may react with zinc oxide, strengthening the matrix.

SETTING TIME : 6-10 MINS FACTORS AFFECTING SETTING TIME: Low p/l ratio inc. setting time Moisture: accelerates setting time.

PROPERTIES Cements have improved mechanical properties. Compressive st :48 MPa Tensile st : 4.1 Mpa

Modulus of elasticity : 2.5 GPa Film thickness : 32 um solubility ,disintegration : 0.03 % wt pulp response : similar to unmodified zoe -

moderate improved abrasion resistance and toughness. MANIPULATION : PROPER P/L is dispensed on a dry glass slab. Powder

is mixed into liquid in small portions with vigorous spatulation.

WORKING TIME : Long working time.

USES Luting agent As base As temporary filling material, As cavity liner

SPECIAL ZOE PRODUCTS Some zoe materials contain antibiotics such as tetracycline,

steroids as anti- inflammatory agents. Their principal use is in pulp capping and RCT. One product also contains barium sulphate, which is radiopaque.

ZINC OXIDE/ ZINC SULPHATE TEMPORARY RESTORATIONS: These are single component temporary filling materials.

Supplied as a single component putty like paste in small tubes, syringes or plastic containers.

Commercial Names : Cavit (ESPE) , Caviton (GC) , Coltosol (Coltene)

Use in short term temporary restorations after caries excavation, RCT etc.

COMPOSITION: zinc oxide; zinc sulphate -1- hydrate ; calcium sulphate – hemihydrates ; dibutyl phthalate (plasticizer) ; diatomaceous earth.

SETTING REACTION: sets by chemical reaction, it sets by reacting with water which it absorbs from the mouth or from the cavity. Setting occurs slowly, expands on setting.

SETTING TIME : Surface hardens in about 20 to 30 mins. Complete hardening takes place in 2-3 hrs.

PROPERTIES : May be white /pink colored. Has good initial sealing. as expands on setting, marginal seal is further improved. Seal gradually dec. with time. strenght is low, its life is short,so material must be used for not more than 1-2 wks.

MANIPULATION : material is dispensed, inserted into cavity using a cement carrier . container should be closed immediately, material is condensed into cavity using a plastic filling instrument ; as sets by hydration , cavity should not be fully dried before placing the material.

ZINC OXIDE EUGENOL PASTE It is probably the most commonly used root

canal filling material for primary teeth.

Camp in 1984 introduced endodontic pressure syringe to over come the problem of underfilling .

Underfilling is frequently clinically acceptable. Overfilling may cause a mild foreign body

reaction.

Another disadvantage of ZOE paste is difference between its rate of resorption and that of the root tooth.

Walkholf paste

KRI paste

Maisto paste

Vitapex

Endoflas

Colla cote

Guedes – Pinto paste

Parachloro-phenol Camphor Menthol

Iodoform 80.8% Camphor 4.86% Parachlorophenol 2.025%Menthol 1.215%

Zinc oxide 14g Iodoform 42gThymol 2gChlorphenol Camphor 3ccLanolin 0.5g

Calcium hydroxide Iodoform Oilyadditives

Zinc oxide 56.5%Barium sulfate 1.63%Iodoform 40.6%Calcium hydroxide 1.07%Eugenol pantachlorophenol

Synthetic collagen

0.30g iodoform 0.25g calcium hydroxide 0.1ml Camphorated paramonoclorophenol

Composition of commonly used root canal materials for primary teeth

Properties ZOE

Ca(OH)2 with Iodoform (VITAPEX)

KRI Paste

1. Restore at the same rate as the tooth

2. Harmless 3. Overfill resorbs4. Antiseptic5. Easily applied 6. Adheres to the wall7. Easily removed8. Radiopaque9. No discoloration

Y

Y Y

Y

Y

Y Y Y Y Y Y Y Y

Y Y Y

Y Y Y Y Y

Comparison of materials used for pulpectomy in primary teeth

CONCLUSION The material has been involved in a wide

range of applications in dentistry, including use as an impression material for edentulous mouths, a surgical dressing, bite registration paste, temporary filling material, root canal filling material, cementing medium, temporary relining material for dentures . The physical and mechanical properties and handling characteristics generally are inferior to those of other long –term luting cements. Main advantage of improved ZOE cements is their biocompatibility.

cement type

setting time (min)

film thickness (um)

24-hr compressive strength (MPa)

24-hr Diametral tensile strength (MPa)

elastic modulus (GPa)

solublity in water

pulp response

Zinc phosphate

5.5 20 104 5.5 13.5 0.06 Moder

ateZOE (type I)

4.0-10 25 6-28 - - 0.04 Mild

ZOE-EBA(type II)

9.5 25 554.1 5.0 0.08 Mild

ZOE plus polymer (type III)

6.0-10 32 484.1 2.5 0.04 Mild

GIC 7.0 24 86 6.2 7.3 1.25 Mild to moderate

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