Which material is the most difficult to remove from the patient's mouth?
Metallic oxide paste
Silicone impression material
Reversible hydrocolloid
Impression plaster
In dentistry, zinc oxide eugenol is popular as an impression material for making impressions of edentulous arches for the construction of complete dentures. It is classified as a rigid, irreversible impression material. It cannot be used for recording impressions of dentate arches and in areas of severe undercuts.
Mannapalli ed 3 page no 166