Tips from a prosthetist

-Coat the mounting plate of your articulator in a thin layer of vaseline, it is easier to remove the model from the articulator
-For denture addition impressions take a pickup impression of the denture. Always check if the denture is stable before the impression. If not, a reline may be needed at the same time. Fill the intaglio surface of the denture in the deficient areas with greenstick to support the denture in occlusion. Then take an impression with ZOE or PVS on the intaglio surface of the denture. The excess material will be extruded from under the denture bearing area. Before it sets, use an instrument to remove the impression material from tooth undercuts on the adjacent teeth. This is because it can lock in on the undercuts and tear on removal. Then take a pickup impression of the denture
-When pouring up models or articulating models place them on a tile. If you need to move it you can pick up the tile. If you don't do this then you have to wait till the stone sets before it can be moved.