title: Survival rate and failure characteristics for two post designs.
abstract: The dental records of 638 patients treated with 788 posts and cores were studied to analyze failure rate and failure characteristics for two post designs. Frequency of the technical failures, loss of retention, root fracture, and post fracture were recorded 4 to 5 years after post cementation. There were two types of posts: custom-cast tapered posts and parallel-sided serrated posts. The cumulative failure rate was 15% for 456 tapered posts and 8% for 332 Para-Post posts. Loss of retention was the most frequent reason for failure for both types of posts, whereas root fractures had the most serious consequences, and all resulted in extraction. A significantly higher success rate was recorded for parallel-sided serrated posts, compared with custom-cast posts, regarding the total failure rate and the severity of the failure (p < 0.05).
authors.affiliation: Department of Prosthetic Dentistry, Faculty of Odontology, University of Göteborg, Sweden.
authors.forename: A
authors.initials: A
authors.lastname: Torbjörner
authors.forename: S
authors.initials: S
authors.lastname: Karlsson
authors.forename: P A
authors.initials: PA
authors.lastname: Odman
mesh_terms: D000044:Dental Abutments; D017267:Dental Prosthesis Design; D017268:Dental Prosthesis Retention; D006801:Humans; D015993:Life Tables; D011176:Post and Core Technique / Q000009:adverse effects; D011475:Prosthesis Failure; D012189:Retrospective Studies; D016019:Survival Analysis; D014082:Tooth Fractures / Q000209:etiology