title: Comparing Fracture Resistance and the Time Required for Two Different Fiber Post Removal Systems.
abstract: OBJECTIVE
  To compare two fiber post removal techniques in terms of fracture resistance and time required for post removal.
  
  
  METHODS
  Post space was prepared to a 9-mm depth in each root canal. The roots were randomly divided into three groups of 15 specimens each. D.T. Light-Posts were cemented in all groups. In group 1, fiber posts were removed using the D.T. Light-Post-removal kit; in group 2, Start-X stainless-steel ultrasonic tips were used. In group 3, fiber posts were left without removal (the control group). For all groups, fracture resistance (N) value was measured and recorded using a universal testing machine. Times required for fiber post removal were also recorded for the two study groups.
  
  
  RESULTS
  There was no significant difference between the control and removal kit groups for fracture resistance values (p = 0.233). The fracture resistance value of the ultrasonic group was found to be significantly lower than that of the control group (p = 0.001) as well as that of the removal kit group (p = 0.032). The fiber post removal time for the ultrasonic group was significantly longer than that for the removal kit group (p < 0.001).
  
  
  CONCLUSIONS
  Compared to the removal kit, removal of the fiber posts with an ultrasonic tip decreases the fracture resistance of the roots, although significantly more time is required.
authors.affiliation: Department of Endodontics, Kocaeli University Faculty of Dentistry, Kocaeli, Turkey.
authors.forename: Seda
authors.initials: S
authors.lastname: Aydemir
authors.affiliation: Department of Endodontics, Kocaeli University Faculty of Dentistry, Kocaeli, Turkey.
authors.forename: Göze
authors.initials: G
authors.lastname: Arukaslan
authors.affiliation: Department of Prosthodontics, Kocaeli University Faculty of Dentistry, Kocaeli, Turkey.
authors.forename: Serkan
authors.initials: S
authors.lastname: Sarıdağ
authors.affiliation: Department of Endodontics, Istanbul Aydin University Faculty of Dentistry, Istanbul, Turkey.
authors.forename: Işıl
authors.initials: I
authors.lastname: Kaya-Büyükbayram
authors.affiliation: Department of Mechanical Engineering, Kocaeli University Faculty of Dentistry, Kocaeli, Turkey.
authors.forename: Yasemin
authors.initials: Y
authors.lastname: Ylıdıran
mesh_terms: D019232:Dental Restoration Failure; D003793:Dental Restoration, Permanent / Q000009:adverse effects / Q000295:instrumentation / Q000379:methods*; D003799:Dental Stress Analysis; D006801:Humans; D011176:Post and Core Technique / Q000295:instrumentation; D013997:Time Factors; D019553:Tooth, Nonvital / Q000601:surgery*; D059708:Ultrasonic Surgical Procedures / Q000379:methods
keywords: Fiber post removal; fracture resistance; ultrasonics