Elastomeric Impression Materials | American Dental Association

Elastomeric Impression Materials

ANSI/ADA Standard No. 19 Executive Summary

What is ANSI/ADA Standard No. 19 about?

This standard gives requirements and test methods for acceptable physical and chemical properties of elastomeric impression materials. It also gives the requirements for what information needs to be provided to the consumer on the labeling and packaging of the products for informed decision making.

What are the requirements I should know about for elastomeric impression materials?

ANSI/ADA Standard No. 19 sets the requirements for these four types of impression materials:

  • Type 0, Very Heavy bodied, Putty-like materials: designed for hand kneading use alone or in combination with lighter bodied Type 1, Type 2 or Type 3 materials
  • Type 1, Heavy bodied: designed primarily for making impressions of complete or partial edentulous arches, with or without the use of companion lighter bodied Type 2 or Type 3 materials
  • Type 2, Medium bodied: designed primarily for making impressions of complete or partially edentulous arches with or without the use of companion syringe extruded increments of Type 3 materials
  • Type 3, Light bodied: designed primarily for syringe use with either companion Type 0, Type 1, or Type 2 heavier bodied materials

Elastomeric Impression Materials characteristics table

What’s the bottom line?

ANSI/ADA Standard No. 19 sets the requirements for dimensional change, elasticity, strain-in-compression, as well as for component colors, consistency, mixing time, working time and detail reproduction in order to determine whether the elastomeric impression materials, as prepared for retail marketing, are of the quality needed for their intended purposes.