Cast posts that fit at first try

The following article describes a procedure that permits the retention of a cast post that will fit passively in the canal at first try. By means of an indirect method, an elastic cast was poured in the master impression and an exact duplicate of the future dowel was formed with self-curing acrylic resin. A stone cast made from a second pour of the impression was then used to adjust the pattern in the laboratory. Posts made with the use of this system routinely sit passively in the root canal without the need of adjustments at the chair. The interval employed in obtaining and adjusting an acrylic resin pattern mentioned in the above way represents less time and effort than trying to make a cast fit in the canal, especially in the case of patients who require multiple posts in the same arch.