One of the most critical steps in prosthodontics is pouring an accurate and durable cast (1, 2). In addition to maintaining a minimum cast height for strength, it is also important to have a circumferential thickness as the land area to protect the sulcular details from inadvertent damage (3).
Although beading and boxing is recommended and the use of base formers is suggested for fast and easy processing, one of the simplest methods of preparing accurate casts is the two-pour technique or the inversion method. (4,5) The impression is first poured face side up and subsequently inverted onto a second mix of plaster or stone on a flat surface and the sides are shaped up. The process is inherently clumsy and messy as the operator has to bend in all directions attempting to sculpt the base.
Materials and Methods
Described here is a simpler method involving the adaptation of a cake icing rotating table and a silicone baking mat cut in a circle to fit the top of the rotating table as a non-stick autoclavable barrier.