Fracture strength and stress distributions of pulpless premolars restored with fiber posts

Yu Furuya, Shih Hao Huang, Yuko Takeda, Alex Fok, Mikako Hayashi

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


This study examined the effect of glass fiber posts on increasing the fracture resistance of endodontically treated teeth. Extracted upper premolars with two canals in a root were divided into three groups according to the number of posts they were restored with: none, one, or two. All teeth were endodontically treated, crown-sectioned, and restored with a composite core and a metallic crown. A static oblique load was applied to the restored tooth until fracture, and the fracture pattern was recorded. Stress distributions were examined by finite element analysis (FEA). Teeth with glass fiber post(s) showed significantly higher fracture loads compared with those without posts. In the premolars without posts, von Mises and maximum principal stresses were found on the root surface alone; in premolars restored with posts, stresses were distributed on both root and post surfaces. Risk of root dentin fracture was significantly lowest in teeth restored with two posts.

Original languageEnglish (US)
Pages (from-to)852-858
Number of pages7
JournalDental Materials Journal
Issue number6
StatePublished - 2014

Bibliographical note

Publisher Copyright:
© 2014, Japanese Society for Dental Materials and Devices. All rights reserved.


  • Fiber post
  • Finite element analysis
  • Fracture strength
  • Pulpless teeth
  • Stress distributions


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