How to Avoid Common Mistakes When Taking Impressions

This course addresses the most common mistakes that occur during traditional impression-taking procedures, and what you can do to avoid them. Also presented are new advancements in impression materials designed to help reduce retakes and simplify the impression-taking procedure—with the ultimate goal of helping to achieve predictable clinical success with an accurate first impression.

Create adequate space for the flash, the portion of impression material that goes beyond the margin. A minimum of 1mm in thickness is the goal. 

Earn 1 FREE CE Credit with a Centrix In-Office Lunch and Learn

void on the margin

Ways to prevent inadequate margins

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We'll discuss common issues we see with impressions, reasons why they happen and the steps we can take to minimize them.

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1 FREE CE Credit

Here's What You're Getting ...FREE

Product Demo

Review of Current Best Practices - Materials and Clinical Techniques

Free Lunch

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What is required to produce an accurate impression.

Here's What You'll Learn

1

2

The most common causes of inadequate margins, and how to prevent them.

3

The most common causes of voids and bubbles, and how to prevent them.

4

The most common causes of ledges, and how to prevent them.

5

What to look for when choosing an impression material.

Mistake #1: Inadequate Margins

Tearing of the margin
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To create accurate, well-fitting crowns, bridges and other indirect restorations, you must first take good impressions. In recent years new technology has been introduced to assist this process: intraoral scanning to create a digital impression and, more recently, extraoral scanning of impressions to generate the same result.

The most common causes of inadequate margins are:

  • Exceeding the impression material’s working time
  • Not achieving adequate sulcular expansion
  • Not using enough wash material
  • Taking too much time between mixing and seating
  • Insufficient tooth reduction for adequate sulcus width 

Other causes of inadequate margins include:

  • Tearing of the margin - This usually occurs from rocking the tray to get
    a proper seating, or from tray movement after the tray has been seated. Tears often occur when the impression material that is beyond the margin (i.e. between the tooth and the tissue) is too thin, and separates when the impression is removed from the mouth.
     

Tearing of the margin 

Mistake #2: Voids and Bubbles

Mistake #3: Ledges

Mistake #4: Choosing an Inadequate Impression Material

Mistake #5: Choosing an Inadequate Tray

The most common causes for voids and bubbles are:

  • Improper syringe technique. This can include incorporating air into a back-loaded syringe while loading material, or failing to keep the tip immersed in the material and the sulcus when injecting material into the preparation.
  • Allowing blood or saliva contamination around the preparation. This is often caused by moisture or bleeding around the prep or inadequate retraction of the sulcus around the prep.
  • Allowing too much time between mixing and seating. Always follow the manufacturer’s recommendations.

Void on the margin

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Schedule your Lunch & Learn to gain understanding of these and other common causes and how to prevent them.

Manage your time. Follow manufacturer recommendations regarding seating time for both regular set and fast set materials.

Keep the syringe tip immersed in the material and the sulcus, while pushing the material 360 degrees around the sulcus.

NoCordTM VPS impression material by Centrix