For the narrow glass-fiber post space preparation (subgroup GN)
Using no. 1 shaping drill of HAHNENKRATT-Contec glass-fiber post kit(E.HAHNENKRATT GMBH | Benzstr. 19 | DE-75203 Königsbach-Stein, Germany), the white calibration drill of 1.3 mm diameter was used to prepare a narrow post space, in respect of adjusting the drill’s length to 10 mm [