Simpson and Natikin have suggested a specialized filling technique for those teeth with tubular canals but closed apices (after apexification process). The canal initially filled with a warmed and softened tailor made gutta percha roll cemented to placed and severed at the canal orifice with a hot spoon excavator.
Using a heavy plugger, the gutta percha is forced to the apex and compacted to place. Pressure with the plugger will leave a void in the center of the mass when the Plugger is removed with a twisting motion. It may be necessary to hold percha with explorer when removing plugger.
Plugger dipped in ZnPO4 cement powder (to prevent sticking) is then used to collapse the gutta percha into the space created by the initial plugging. Plugger is heated to better compact the filling.
Excess gutta
percha removed till the cervical level.
Chemically Plasticized Cold Gutta Percha: Solvent is used to soften the primary gutta percha point to better conform to the aberrations in apical canal anatomy. This is a variation of a very old obturation method called “Callahan-Johnston technique� first given by Callahan in July of 1911. In which, too much of the solvent,