A holder for a delivery device for delivering filler material into a prepared root canal comprises a body, a mounting portion adapted to removably receive the delivery device and a heating circuit having a heating device wherein said heating device is positioned to be in thermal communication with said delivery device when the delivery device is mounted to the holder. The holder thus enables heating of the filling material in situ in the prepared root canal at the time of insertion of the filling material in to the canal and while the filler material is being packed into the prepared canal.
