Objective: The aim of this retrospective study was to evaluate the success rate and failure types of prefabri- cated metal post-core restorations in 5 years period of usage. Methods: The records of 85 patients, who had been treated with 149 prefabricated metal posts were analysed and recalled after 5 years of treatment for clinical and radiological examination. The parameters that were used in the evaluation were: loss of post retention, loss of crown retention, post fracture, root fracture, secondary caries, apical lesions, type of prosthetic restoration (crown / bridgework / removable partial denture), location ( upper / lower jaw, incisor / canine / premolar / molar). The success and failure rates were calculated. Results: The success rate of post-core restorations was 91,94%. Loss of prosthetic restoration retention was the most frequent failure mode (16.10%), followed by secondary caries (9,39%). The failure rate of post reten- tion loss was 3.35%. No root fractures were recorded. The failure rates according to the type of prosthetic restoration were 23.08% in removable partial dentures, 8.64% in crown and 3.64% in bridgework restorations. Conclusion: The results showed that the success rate of post-core restorations were in satisfactory limits. However, since the higher loss of post retention rate was seen in removable partial denture cases, it should be paid attention in deciding to treat the supporting tooth of removable denture with a post-core restoration.