Effect of dowel preparation on the apical seal of obturated root canals by three obturation techniques

Creating a space to receive the dowel is a very critical phase of the fixed prosthetic treatment because it necessitates the removal of a portion of the root canal filling material. The degree of the apical leakage was measured quantitatively after the preparation of dowel space at 3 and 4mm levels in roots which had been filled by three techniques for gutta-percha condensation. Best sealing results were obtained at the level of 5mm when vertical and automatic condensation techniques were used