For the wide glass-fiber post space preparation (subgroup GW)
Using no. 3 shaping drill of HAHNENKRATT-Contec glass-fiber post kit, the blue calibration drill of 1.75 mm diameter was used to prepare a wide post space, in respect of adjusting the drill’s length to 10 mm [Regarding the composite resin core that was built in both subgroups GN and GW, it had dimensions of 4-mm labio-palatally, 4-mm mesio-distally and 4-mm inciso-cervically. These composite cores were then built after the cementation procedure of glass fiber posts [