Tech Tip: An in-depth look at impressions

Perhaps the most important aspect of submitting a case with ClearCorrect is making sure that you have clear, accurate intraoral scans or impressions. We thought we'd cover some of the basics on the topic of taking impressions, along with some new information that you may not know.

We love intraoral scans, but if you prefer taking PVS impressions, we happily accept them. We require both upper and lower impressions, even if you're only treating one arch. As we've mentioned recently, bite registrations are now optional.

You can use nearly any type of tray you like for your impressions except for metal trays. We don't return your impressions, so it's best to use disposable trays.

PVS or VPS materials work best for impressions. Polyether (Impregum) will work as long as the detail for the gum lines are there. In our experience, Sultan Genie™ VPS and Premium Dental VPS impression materials are easy to work with and deliver consistent results. If you prefer a different polyvinyl or polyether impression material, feel free to continue using what you're comfortable with. Alginate is not acceptable because it dries out and distorts.

A good impression looks like this:

Good_Impression.png

We recommend one-step impression methods for the best results, but we'll accept two-step impressions as well.

Make sure your trays are properly sized to fit all the teeth and surrounding gums. Because our aligners cover beyond the gingiva for improved retention, the importance for obtaining full and complete impressions cannot be overstated. Impressions that may have worked for other clear aligner companies, should not be assumed to work for our product (especially where the gingiva is not covered in the impression).

Our most common issue with impression distortions is material that hasn't fully set before being removed. There are a few simple things you can do to prevent this problem:

  • Set a timer and make sure to follow the directions for your material exactly
  • Discard the first inch of material that comes out of every new mixing tip
  • We recommend waiting an additional 60-90 seconds longer than instructed before removing the trays from the patient's mouth

Did you know that performing a cleaning before taking impressions, removes plaque which can make for better impressions and could reduce the amount of residual spacing at the end of treatment?

Any existing spaces or gaps that are filled with plaque can be properly caught in an impression if a cleaning is done before impressing. With the plaque removed, the spaces or gaps get accurately detailed in the impression and when the aligners are made, they can indent into those gaps and push out any plaque that develops during treatment. This process could reduce the amount of residual spacing at the end of treatment.

Help Center articles

Our help center has several helpful articles on the topic of impressions. Maybe they can be of use to you. Check out some of these great articles here:

We hope you found this information helpful! Don't miss our upcoming advanced training webinars on case submission, prescription & treatment setups or our advanced training series of webinars on various topics related to clear aligner treatment.

Until next time…

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