How to Take Two-step Impressions

For information on taking a two-step impression, refer to the following:




Definition

A two step impression is when an impression is taken twice, the first time with heavy/medium body, then when that material is set, the second step is to add light body over the VPS putty for another impression.




Uses

Impressions are taken when submitting a case and whether you take one-step or two-step impressions is entirely up to you as the doctor and what is your preference.




Parts Needed

The following are a list of parts that are needed:

  • Two impression trays
  • Tray adhesive
  • Light body impression material
  • Impression gun
  • VPS putty
  • Small square of plastic wrap
  • Timer
  • Scissors (for cutting end of light body tip)

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Taking a Two-Step Impression

The following is a step by step instructional video on take a two-step impression:

NOTE: Download a printable guide to taking two-step impressions here

To take a two-step impression, perform the following:

1. Ensure that you have the right size tray for the patient's mouth, the tray should extend beyond the last tooth in the arch without touching the gums.

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2. When you’re sure you have the right size trays for your patient’s mouth, apply adhesive to the trays. NOTE: This will help prevent the impression material from becoming unseated from the tray upon removal from the mouth.

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3. Mix the VPS putty, set your timer for the working time of your material, then knead the two putties together until you get a mixture that has no streaks in it.

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4. When the putty is thoroughly mixed, roll the mixture up into a "sausage" and fit it into the tray.

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5. Place the square sheet of plastic wrap over the tray and press into it gently to make a shallow channel in the putty.

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6. Making sure the tongue and lips are out of the way, press the tray firmly into the teeth. Set your timer for the intra-oral set time of your putty. Wait for the putty to set, then take the tray out and remove the plastic wrap.

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7. Express the light body impression material into the indentations in the tray - you don't need a lot.

Press the tray into the teeth, but not too hard - you don't want the teeth to push all the way through the impression material and touch the tray. Set your timer for the intra-oral set time of your light body material, and keep pressure on the tray until the impression has set.

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8. When you're checking your impression for quality, make sure that:

  • All teeth are clearly registered
  • There are no voids or tears
  • At least 5mm of gum tissue is visible
  • No teeth are hitting the tray

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