After the post space preparation is completed. an elastomeric impression of the canal is made. To- prevent trapping of air bubbles in the impression, a syringe needle is held in the canal. As the elastomer is injected into the canal, air escapes through the needle. The needle is removed while pressure is maintained with the impression syringe. A new needle is used with each canal. A metal rod, coated with adhesive, is inserted into the canal for strength and then the tray with regular-bodied material is seated. After the impression has been removed, a temporary restoration is placed in the post. The remainder of the procedure is performed in the laboratory. The impression is poured in a dental stone. After the model is separated, the post and core are waxed directly on the stone die without lubrication .
REF: JOURNAL OF PROSTHETIC DENTISTRY
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