A delivery device for delivering filling material into the canal during a root canal procedure includes a shaft having a bed portion at a distal end thereof, and a biocompatible filler material mounted to the bed portion. The filler material includes an upper surface, a side surface, and a distal end. The delivery device bed portion has a greater thermal conductivity than the filler material; and the bed portion of the shaft wraps at least partially around the filler material and contacts the filler material substantially along the length of the filler material from the upper end of the filler material to at, or proximate, the distal end of the filler material. This delivery device allows for better control of temperature delivery and position of the filling material and allows for a more thorough and precise heating of the filler material in vivo.