Zinc oxide eugenol
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Zinc oxide eugenol (ZOE) is a material created by the combination of zinc oxide and eugenol contained in oil of cloves. An acid-base reaction takes place with the formation of zinc eugenolate chelate. The reaction is catalysed by water and is accelerated by the presence of metal salts. ZOE can be used as a dental filling material or dental cement in dentistry. It is often used in dentistry when the decay is very deep or very close to the nerve or pulp chamber. Because the tissue inside the tooth, i.e. the pulp, reacts badly to the drilling stimulus (heat and vibration), it frequently becomes severely inflamed and precipitates a condition called acute or chronic pulpitis. This condition usually leads to severe chronic tooth sensitivity or actual toothache and can then only be treated with the removal of the nerve (pulp) called root canal therapy. For persons with a dry socket as a complication of tooth extraction, packing the dry socket with a eugenol-zinc oxide paste on iodoform gauze is effective for reducing acute pain. The placement of a ZOE "temporary" for a few to several days prior to the placement of the final filling can help to sedate the pulp. It is classified as an intermediate restorative material and has anaesthetic and antibacterial properties. It is sometimes used in the management of dental caries as a "temporary filling". ZOE cements were introduced in the 1890s.
Zinc oxide eugenol is also used as an impression material during construction of complete dentures and is used in the mucostatic technique of taking impressions, usually in a special tray, (acrylic) produced after primary alginate impressions. However, ZOE is not usually used if the patient has large undercuts or tuberosities, whereby silicone impression materials would be better suited.
Zinc oxide eugenol is also used as an antimicrobial additive in paint.
According to ANSI/ADA Specification no:30 (ISO 3107) and depending on intended use and individual formulation designed for each specific purpose:
The chemical composition of ZOE is typically:
- Zinc oxide, ~69.0%
- White rosin, ~29.3%
- Zinc acetate, ~1.0% (improves strength)
- Zinc stearate, ~0.7% (acts as accelerator)
- Liquid (eugenol, ~85%, olive oil ~15%)
ZOE impression pastes are dispensed as two separate pastes. One tube contains zinc oxide and vegetable or mineral oil; the other contains eugenol and rosin. The vegetable or mineral oil acts as a plasticizer and aids in offsetting the action of the eugenol as an irritant.
Oil of cloves, which contains 70% to 85% eugenol, is sometimes used in preference to eugenol because it produces less burning sensation for patients when it contacts the soft tissues. The addition of rosin to the paste in the second tube facilitates the speed of the reaction and yields a smoother, more homogenous product.
Canada balsam and Balsam of Peru are often used to increase flow and improve mixing properties. If the mixed paste is too thin or lacks body before it sets, a filler (such as a wax) or an inert powder (such as kaolin, talc, or diatomaceous earth) may be added to one or both of the original pastes.
- Jack L. Ferracane, Materials in Dentistry: Principles and Applications, 2001, 2d Edition, Lippincott Williams & Wilkins, ISBN 0-7817-2733-2
- Richard van Noort, 2002, Introduction to Dental Materials, 2d Edition, Elsevier Health Sciences, ISBN 0-7234-3215-5
- Tarakji B, Saleh LA, Umair A, Azzeghaiby SN, Hanouneh S (April 2015). "Systemic review of dry socket: aetiology, treatment, and prevention". J Clin Diagn Res. 9 (4): ZE10–3. doi:10.7860/JCDR/2015/12422.5840. PMC 4437177. PMID 26023661.
- Zinc Oxide Eugenol Impression Pastes -A Study of an impression material- Chung Suck Lee, D.D.S.