title: A preliminary comparative study of the retentive properties of four post and core systems in etched preparations.
abstract: Post and core systems anchored and supported by endodontic files, Para Posts, Boston Posts and Flexi Posts were subjected to tensile testing in an Instron testing machine. All forces were applied to the cores until the post-core system was removed. The test results revealed no statistically significant difference among post and core systems built up with Para Posts, Boston Posts or Flexi Posts. The endodontic files proved to be significantly less retentive than the other post systems evaluated. Under the conditions of this study, the use of endodontic files as retentive posts is not supported.
authors.affiliation: Department of Endodontics, Faculty of Dentistry, University of Toronto, Ont.
authors.forename: M
authors.initials: M
authors.lastname: Gelfand
mesh_terms: D000704:Analysis of Variance; D003799:Dental Stress Analysis; D003781:Denture Retention; D004708:Endodontics / Q000295:instrumentation; D006801:Humans; D011176:Post and Core Technique / Q000295:instrumentation*; D011475:Prosthesis Failure