title: Microleakage of different post systems and a custom adapted fiber post.
abstract: OBJECTIVE
  The effects of closely adapting a prefabricated fiber to the post space remain unknown. The purpose of this study was to quantify the microleakages of a custom adapted fiber-reinforced post, a prefabricated quartz fiber post and a cast post using nondestructive methods.
  
  
  METHODS
  Sixty-five extracted human premolars were endodontically treated and randomly divided into three groups (n=15), which were restored using a cast post-and-core, a custom adapted fiber post (Refropost) with a microhybrid microfiller resin composite (Gradia), or a prefabricated quartz fiber post (DT light post) and two groups of control (n=10). All groups were cemented using a dual polymerizing resin cement (Panavia F2.0). A composite core (Z100) was used for the fiber posts. The microleakage was calculated for the experimental and control groups before and after thermal cycling and cycling loading using a radiotracer solution (thallium 201 chloride) and a gamma counter device. Data were subjected to statistical analysis of ANOVA and Tukey HSD at significant level of P< 0.05.
  
  
  RESULTS
  Significantly lower microleakage values were found for the cast post-and-core (mean value =16.04 ×10(4)) and custom adapted fiber post groups (mean value=14.36×10(4)). Thermal cycling and cyclic loading had no significant effect on the microleakage value of any tested group.
  
  
  CONCLUSIONS
  Post systems with improved adaptation showed similar microleakage to casting posts.
authors.affiliation: Associate Professor, Dental Implant Research Center, Department of Prosthodontics, Faculty of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Farideh
authors.initials: F
authors.lastname: Geramipanah
authors.forename: Susan Mir Mohammad
authors.initials: SM
authors.lastname: Rezaei
authors.forename: Saman Fallahi
authors.initials: SF
authors.lastname: Sichani
authors.forename: Babak Fallahi
authors.initials: BF
authors.lastname: Sichani
authors.forename: Leyla
authors.initials: L
authors.lastname: Sadighpour
keywords: Dental Microleakage; Thallium Radioisotop; Tooth Preparation, Prosthodontic