Dental impression

Dental impressions

Impression vs digital scan

There are reasons to use both of these in certain situations but often it comes down to doctor preference.

Dental impressions

Metal tray better than plastic.   Putty better than heavy/light. 

Dental digital scans

 List of most of the big names
  • CEREC® (learn more)
  • TRIOS® (learn more)
  • Lava™ C.O.S. (learn more)
  • 3M™ True Definition Scanner
  • Cadent iTero™
  • IOS FastScan®

Dental impression concepts

  1. Mucostatic impression technique (minimal pressure)
  2. Functional impression (pressure technique)
  3. Semi-functional impression (selective-pressure technique)


VSE (vinyl siloxanether) is the newest impression material and reports to have the advantages of both PE (polyether) and VPS (vinyl polysiloxane or addition silicone).

VSE acceptable Stober 2010 J Pros Dent

VSE better Pandey JDental Medical Sciences 2014

VPS better Schaefer 2013 J Pros Dent

Many of these numbers are so small that they are clinically insignificant.  Also important to remember that setting expansion of modern Type IV die stones is designed to match the inherent volume loss of elastomeric impression material.  Any mild improvement of accuracy may actually be hurting.

Dental impression tricks

Use a block out material for patients with bone and tissue loss from periodontal disease.

Block out material use for dental impression.

The blue blockout material goes in as a flowable and we cure it in place and then remove after the dental impression.

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