title: Fracture resistance of endodontically treated anterior teeth restored with four post-and-core systems.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the fracture resistance and the mode of failure of endodontically treated teeth restored with four post-and-core systems.
  
  
  METHODS
  Forty intact human incisors were randomly divided into four groups. Teeth from each group received endodontic therapy and one of four post-and-core systems: serrated, parallel-sided, cast post and core; serrated, parallel-sided, prefabricated post and resin-composite core; carbon-fiber-reinforced (CFC) post and resin-composite core; and ceramic post and resin-composite core. A full-coverage metal crown was fabricated and cemented onto each tooth. Each specimen was subjected to a compressive load at a 45-degree angle to its axis until failure. The failure load was recorded and compared statistically. The mode of failure of the specimens was analyzed.
  
  
  RESULTS
  There was no significant difference in the failure loads among groups. More catastrophic root fracture was detected in the group restored with ceramic posts and resin-composite cores.
  
  
  CONCLUSIONS
  The fracture resistance of endodontically treated teeth restored with these four post-and-core systems could be accepted clinically. Unfavorable tooth fracture was shown in all groups.
authors.affiliation: Dental Department, Taichung Veterans General Hospital, Taichung, Taiwan, Republic of China.
authors.forename: Yun-Hsin
authors.initials: YH
authors.lastname: Hu
authors.forename: Lok-Chao
authors.initials: LC
authors.lastname: Pang
authors.forename: Chii-Chih
authors.initials: CC
authors.lastname: Hsu
authors.forename: Yau-Hang
authors.initials: YH
authors.lastname: Lau
mesh_terms: D000704:Analysis of Variance; D002244:Carbon; D000077482:Carbon Fiber; D002516:Ceramics; D003188:Composite Resins; D019245:Compressive Strength; D019232:Dental Restoration Failure; D006801:Humans; D007180:Incisor; D008437:Maxilla; D011176:Post and Core Technique; D018709:Statistics, Nonparametric; D014082:Tooth Fractures / Q000150:complications*; D019553:Tooth, Nonvital / Q000150:complications*
chemical_list: D000077482:Carbon Fiber; D003188:Composite Resins; D002244:Carbon