Step 3: Making the Impression Part 2
We now have a negative of our teeth. Remove any excess alginate dangling off the tray.
Now carefully remove the alginate mold out of it's tray. I will refer to the Styrofoam cup method since I used this method. Rip apart the tray piece by piece till you have it completely removed.
Get a new Styrofoam cup and cut about half way. Insert the alginate mold inside. Since the alginate mold was made from the Styrofoam cup, it should fit nicely and get less mistakes from the plaster.
Mix the plaster. The Permastone one requires a three parts powder and 1 part cold water. The water may seem like a small amount but it is enough. Too much causes it to be too watery, too little and it doesn't solidify.
After you've mixed the plaster, pour into the cup with the alginate mold. Begin to tap the sides of the cup with alginate mold after pouring the plaster in. This will prevent bubbles from forming in the mold. Tap till you believe all of the bubbles are out. My first one gave out a few big bubbles and then stop coming up so I stopped there. The second had many tiny bubbles. After the few taps the amount of bubbles seemed to remain the same so I stopped there.
Let it sit for about 40 min. Package says 20-30min, but I like to make sure.