Sealing ability of Dyract, Geristore, IRM, and Super-EBA as root-end filling materials

The purpose of this study was to evaluate the apical sealing ability of two compomers (Dyract and Geristore), IRM, and Super-EBA. Forty single canal r oots from human teeth were instrumented until a size 40 file extended 1 mm beyond the apex. One millimeter of root apex was removed and a preparation 3-mm deep was prepared. Roots were divided into 4 groups of 10 roots each a nd filled with IRM, Super-EBA, Dyract, or Geristore. Canals were not obtura ted to ensure that any leakage was due to the apical filling material alone . Each root was then affixed to a fluid filtration device and subjected to a pressure of 14 cm of H2O, which has been determined to be the normal pulp al tissue pressure. The integrity of the seal was evaluated for 5 min at 1, 7, 30, and 180 days. Data were analyzed at each time point using one-way a nalysis of variance on ranks. The results of this study suggest that the ne w compomers Dyract and Geristore are equal or superior to IRM and equivalen t to Super-EBA in their ability to reduce apical leakage when used as retro filling materials.