An office dental lab is very messy, and the plaster mixing bowl has old, set plaster in it. A hygienist in a hurry uses the dirty bowl to mix some model plaster. She finds that the setting time of the mix is very short. What may have happened?
it might have had like some of the mix from the last time it was used then it might have help the mix to be shortened in time because that was a huge factor that help do it I think.
