Bad dental impression9/10/2023 ![]() ![]() That is what allowed for a successful second impression. The air-inhibited layer was gone at the time of the second impression and I also pumiced the teeth thoroughly to remove the temp adhesive. That’s when I called the manufacturer and discovered that the provisional material I use, a bis-acrylic, has an air-inhibited layer that can retard the set of vinyl polysiloxane impression materials if it is not completely removed prior to making the impression. I fabricated them and then took the impression. In this case, I wanted to measure the thickness of the provisionals as another way to double check the facial reduction of these veneers. You can see the “gooey-ness” in the image below, mostly on the palatal surface (see the image below).Īs I reviewed my technique, I realized that the only thing that was different was the timing of fabricating provisionals. When I pulled the impression from the mouth and examined it under magnification, parts of the material looked unset and pulled from the teeth. The new model was fine so my assumption was that it was a bad batch of impression material.įast forward to another veneer case shortly afterward. I had the patient back, removed the provisionals and redid the impression. My impression material for this model was vinyl polysiloxane and is one I had used consistently for several years, never having this happen before. ![]() He sent over some images and the models looked like they had some kind of scaly disease (see the photo below). I got a call from my lab a while back telling me that my models didn’t look right. ![]()
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