The effect of immediate and delayed post space preparation and post length on the apical seal.

The purpose of this study was to investigate in vitro the effect of immediate and delayed post space preparation as well as the effect of remained length of gutta-percha on the apical seal of endodontically treated teeth obturated by lateral condensation technique using Ketac-Endo as root canal sealer. The apical seal was evaluated by measuring the microleakage using an electrochemical technique. It was found that, the degree of apical leakage is dependent on the length of post space preparation or the remained length of gutta-percha. Also the post space preparation should be delayed until maximum setting of Ketac-Endo root canal sealer.