Zinc Oxide Eugenol Impression Paste

Zinc Oxide Eugenol Impression Paste

“What is zinc oxide eugenol impression paste? A detailed question and answers guide”

• The ZOE impression paste is a rigid, irreversible material.
• It is mainly used for making an impression of an edentulous mouth.

Composition:

• Base Paste
  • Zinc oxide 87%
  • Fixed vegetable or mineral oil 13%
• Accelerator Paste or Catalyst Paste:
  • Oil of clove or eugenol (70 to 85%)  – 12%
  • Gum or polymerized rosin – 50%
  • Filler (Silica type) – 20%
  • Lanolin –  03%
  • Resinous balsam – 10%
  • Accelerator solution (CaCl₂) and coloring agents – 05%

“Understanding zinc oxide eugenol impression paste through FAQs: Composition, properties, and uses explained”

“Importance of studying zinc oxide eugenol impression paste for dental professionals: Questions explained”

Role of Each Ingredient 

• Zinc oxide: Main ingredient to react with the catalyst. It should be finally divided and should contain slight amount of water.
• Fixed vegetable or mineral oil: Acts as a plasticizer and also aids in masking the action of eugenol as an irritant.
• Oil of clove: It contains 70–85% eugenol. It reduces the burning sensation or irritant effect of eugenol.
• Gum or polymerized rosin: Speeds the reaction and improves homogeneity.
• Canada or Peru balsam: Improves flow and mixing properties.
• Filler: It provides proper consistency of the mix.
• Calcium chloride: Acts as an accelerator of setting reaction.
• Other Accelerators:
  • Zinc acetate
  • Primary alcohol
  • Glacial acetic acid.

“Common challenges in mastering zinc oxide eugenol impression paste effectively: FAQs provided”

Uses of Zinc Oxide Eugenol Impression Paste:

• As cementing and insulating medium
• As temporary filling material
• As root canal filling material
• As surgical pack in periodontal surgeries
• For bite registration
• As temporary relining material for dentures
• For taking an impression in edentulous patients.

Properties of Zinc Oxide Eugenol Impression Paste:

• Consistency and flow: A thin free flowing material copies the tissues without distorting them. Clinically these materials have very good flow. According to ADA specification No. 26, the spread is:
  • Type I paste: 30 to 50 mm
  • Type II paste: 20 to 45 mm.

“Factors influencing success with zinc oxide eugenol impression paste: Q&A”

• Detail reproduction: It registers surface details quite accurately due to the good flow.
• Rigidity and strength: The impression should resist fracture and be unyielding when removed from the mouth.
• The compressive strength of hardened ZOE is 7 MPa two hours after mixing.
• Biological consideration: Some patients may experience a burning sensation in the mouth due to eugenol. It can also cause tissue irritation.