Cementation of glass-fiber posts in subgroups GN and GW
Post spaces were irrigated with 2.5% NaoCl, normal saline and 70% alcohol, dried and etched with 37% phosphoric acid(Metabiomed Co. LTD, South Korea) then rinsed with water then completely dried by endodontic absorbing paper points(Metabiomed Co. LTD, South Korea) [Calibra Universal Self-Adhesive resin cement (Maillefer-Dentsply, Ballaigues, Switzerland) was used for cementation of each specimen with changing injection tip, with respect to different diameters for each subgroup. Following the manufacturer’s instructions, the auto-mixing tip was attached then injection of the cement was done into the post spaces as well as all around posts’ surfaces. It was light-cured for 20 seconds. The excess cement was removed using composite finishing burs(Komet Dental. Gebr. Brasseler GmbH & Co. KG Trophagener Weg 25.32657 Lemgo. Germany) mounted on high-speed handpiece.