The Effect of Immediate versus Delayed Dowel Space Preparation on Endodontically Filled Teeth

摘要

This in vitro study evaluated the effect of immediate versus delayed dowel space preparation on the integrity of the apical seal. Twenty human teeth were obturated by lateral compaction of gutta-percha and cement, and stored. Two weeks later, twenty more were similarly filled. Using hot endodontic pluggers, dowel spaces were prepared such that either 3mm or 7mm of apical fill remained. The specimens were treated in Ca(45)Cl2, horizontally sectioned and autoradiographs made. Analysis of the incidence and degree of microleakage showed that delayed dowel preparations significantly increased leakage (p=.01) if only 3mm of apical fill remained. (Author)