title: The effect of serrations on carbon fibre posts-retention within the root canal, core retention, and post rigidity.
abstract: The retention in root canals of serrated carbon fibre Composiposts and stainless steel Paraposts was tested under tensile load. Twenty unrestored human roots were endodontically prepared and root filled. Two groups of 10 roots received 1.4-mm Composiposts or 1.25-mm Paraposts luted with a resin cement. The specimens were then embedded in acrylic resin and mounted in an Instron machine. The tensile force (kg) required to dislodge the posts was recorded and analysed with Student's test. The results revealed that there was no significant difference in the retention of either post (P > .05). The rigidty of 10 1.4-mm serrated Composiposts was tested in a three-point bend test in an Instron machine, and the retention of composite cores to 10 of these posts under tensile force was also tested. The results from these tests were compared to previous data from the authors' laboratory and revealed that the serrations significantly reduced the rigidity of the post (P < .001) and increased the retention of a core material (P < .001).
authors.affiliation: Department of Restorative Dentistry, University of Otago School of Dentistry Dunedin, New Zealand.
authors.forename: R M
authors.initials: RM
authors.lastname: Love
authors.forename: D G
authors.initials: DG
authors.lastname: Purton
mesh_terms: D002244:Carbon / Q000737:chemistry; D000077482:Carbon Fiber; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D017267:Dental Prosthesis Design; D017268:Dental Prosthesis Retention / Q000295:instrumentation; D004548:Elasticity; D005069:Evaluation Studies as Topic; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D018583:Pliability; D011176:Post and Core Technique / Q000295:instrumentation*; D019279:Resin Cements; D013193:Stainless Steel / Q000737:chemistry; D013718:Tensile Strength
chemical_list: D000077482:Carbon Fiber; D003188:Composite Resins; D019279:Resin Cements; D013193:Stainless Steel; C079578:Ti-Core composite resin; D002244:Carbon