title: An in vitro evaluation of fracture strength of endodontically treated teeth with simulated flared root canals restored with different post and core systems.
abstract: OBJECTIVE
  The objective of this study is to evaluate the fracture strength and mode of failure of endodontically treated teeth with flared canals restored with two fiber reinforced systems (glass fiber and quartz fiber) and one base metal cast post and core system.
  
  
  METHODS
  Forty five anterior teeth were decoronated at cemento-enamel junction and were endodontically treated. Post space was prepared and randomly divided into three groups according to post system. Specimens were loaded at 45° in a universal testing machine at a cross head speed of 0.5 mm/min until failure. The mode of failure was classified as repairable or non-repairable.
  
  
  RESULTS
  Teeth restored with cast posts have fracture strength twice that of teeth restored with fiber posts. Fiber-reinforced posts failed at a certain compressive force but they were repairable unlike the non-repairable fracture seen with cast posts.
  
  
  CONCLUSIONS
  The results of this study showed that, fracture strength and mode of failure in anterior teeth with flared canals varied according to the type of post used to support a crown.
authors.affiliation: Department of Conservative Dentistry and Endodontics, The Oxford Dental College and Hospital, Bangalore, Karnataka, India.
authors.forename: Jayshree
authors.initials: J
authors.lastname: Hegde
authors.lastname: Ramakrishna
authors.forename: Kusum
authors.initials: K
authors.lastname: Bashetty
authors.lastname: Srirekha
authors.lastname: Lekha
authors.lastname: Champa