The purpose of this study is to compare the fracture strengths of custom-fabricated Celay all-ceramic post-core , custom cast metal post-core , and prefabricated stainless steel post (Parapost) plus composite resin core with or without a 2. 0 mm dentine ferrule.Methods :A total of 60 recently extracted human maxillary central incisors were endodontically treated and divided into five groups of 12. They were given the following treatments : Group A: Celay ceramic post-core with 2. 0 mm dentine ferrule , Group B : Celay ceramic post-core with no dentine ferrule , Group C: cast metal post-core with 2. 0 mm dentine ferrule , Group D: cast metal post-core with no dentine ferrule , and Group E: prefabricated post and composite core with 2. 0 mm dentine ferrule. All specimens were stored at 100 % humidity at room temperature for 30 days before testing. Each specimen was in a special jig at a 45°angle to the long axis and subjected to a load on MTS 810 universal material testing machine until failure , with crosshead speed of 0. 02 cmPmin. Analysis of variance followed by the Newman- Keuls pairwise multiple comparison test was used to compare the results of the groups tested. Results :There was a statistically significant difference between five groups ( P
