On of the important factor that supported success of root canal treatment is fielling the rool canal system hermetically. Necrosis of young permanent tooth pose a difficulty in root canal treatment and
induction of the apical area to build an apical stop should be conducted. Apical constriction is necessary to fiel the root canal and Calcium Hydrokside is use for this measure, so that the fielling material will not exied beyond the root canal system. A case of success treatment of Traumatized tooth was reported using Calcium Hydrokside.
