title: Comparative evaluation of fracture resistance under static and fatigue loading of endodontically treated teeth restored with carbon fiber posts, glass fiber posts, and an experimental dentin post system: an in vitro study.
abstract: BACKGROUND
  This investigation sought to compare the fracture resistance under static and fatigue loading of endodontically treated teeth restored with fiber-reinforced composite posts and experimental dentin posts milled from human root dentin by using computer-aided design/computer-aided manufacturing.
  
  
  METHODS
  Seventy maxillary central incisors were obturated and divided into 4 groups: control group without any post (n = 10), carbon fiber post group (n = 20), glass fiber post group (n = 20), and dentin post group (n = 20). Control group teeth were prepared to a height of 5 mm. In all other teeth, post space was prepared; a post was cemented, and a core build-up was provided. Half the samples from each group were statistically loaded until failure, and the remaining half were subjected to cyclic loading, followed by monostatic load until fracture.
  
  
  RESULTS
  One-way analysis of variance and Bonferroni multiple comparisons revealed a significant difference among test groups. The control group demonstrated highest fracture resistance (935.03 ± 33.53 N), followed by the dentin post group (793.12 ± 33.69 N), glass fiber post group (603.44 ± 46.67 N), and carbon fiber post group (497.19 ± 19.27 N) under static loading. These values reduced to 786.69 ± 29.64 N, 646.34 ± 26.56 N, 470 ± 36.34 N, and 379.71 ± 13.95 N, respectively, after cyclic loading.
  
  
  CONCLUSIONS
  Results suggest that human dentin can serve as post material under static and fatigue loading. Although at an early stage in research, the use of dentin posts in root-filled teeth looks promising.
authors.affiliation: Department of Conservative Dentistry and Endodontics, Maulana Azad Institute of Dental Sciences, New Delhi, India. dr_ambics@yahoo.com
authors.forename: Khetarpal
authors.initials: K
authors.lastname: Ambica
authors.forename: Kavitha
authors.initials: K
authors.lastname: Mahendran
authors.forename: Sangeeta
authors.initials: S
authors.lastname: Talwar
authors.forename: Mahesh
authors.initials: M
authors.lastname: Verma
authors.forename: Govindaswamy
authors.initials: G
authors.lastname: Padmini
authors.forename: Ravishankar
authors.initials: R
authors.lastname: Periasamy
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D001696:Biomechanical Phenomena; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D001732:Bite Force; D002244:Carbon / Q000737:chemistry*; D000077482:Carbon Fiber; D002484:Cementation / Q000379:methods; D003188:Composite Resins / Q000737:chemistry; D017076:Computer-Aided Design; D003764:Dental Materials / Q000737:chemistry*; D017267:Dental Prosthesis Design; D003804:Dentin; D017220:Dentin-Bonding Agents / Q000737:chemistry; D004853:Epoxy Resins / Q000627:therapeutic use; D005898:Glass / Q000737:chemistry*; D006171:Gutta-Percha / Q000627:therapeutic use; D006801:Humans; D007180:Incisor / Q000473:pathology; D008422:Materials Testing; D011176:Post and Core Technique / Q000295:instrumentation*; D019279:Resin Cements / Q000737:chemistry; D012387:Root Canal Filling Materials / Q000627:therapeutic use; D018915:Root Canal Preparation / Q000379:methods; D013314:Stress, Mechanical; D013696:Temperature; D013997:Time Factors; D014082:Tooth Fractures / Q000503:physiopathology*; D019553:Tooth, Nonvital / Q000473:pathology / Q000628:therapy*; D014867:Water / Q000737:chemistry
chemical_list: D000077482:Carbon Fiber; D003188:Composite Resins; D003764:Dental Materials; D017220:Dentin-Bonding Agents; D004853:Epoxy Resins; C438835:Filtek P60 Composite Resin; C528569:Rely-X; D019279:Resin Cements; D012387:Root Canal Filling Materials; C534916:epoxy resin-based root canal sealer; C009753:fiberglass; C115612:single bond; D014867:Water; D017438:Bisphenol A-Glycidyl Methacrylate; D002244:Carbon; D006171:Gutta-Percha