title: In vitro evaluation of glass fiber post.
abstract: BACKGROUND
  Techniques and recommendations for the restoration of endodontically treated teeth have changed from the use of custom cast metal post and core system to glass fiber-reinforced (GFRC) post and composite core system. Has this latest prefabricated glass fiber reinforced post and composite core system increased the fracture resistance of teeth and reduced the incidence of unrestorable root fractures.
  
  
  OBJECTIVE
  The purpose of this study was to evaluate the incidence of root fracture and mode of failure of endodontically treated teeth restored with two different post and core systems.
  
  
  METHODS
  Forty maxillary central incisors were randomly divided into two groups. (n=20). All teeth received endodontic treatment. First group was restored with custom cast post and core system. Second group was restored with glass fiber post and composite core system. In Both the groups posts were cemented with adhesive resin cement. Compressive load was applied at an angle of 130 to the long axis of teeth at a cross head speed of 1 mm/min until fracture occurred. Data were analyzed with student "t" test P<.001.
  
  
  RESULTS
  The mean value for fracture resistance was (331.4025) N in Group -I Custom cast Ni-Cr post and core and (237.0625) N in Group -II Glass fiber reinforced post and composite core system. Students "t" test shows the significant difference in fracture resistance of two groups.
  
  
  CONCLUSIONS
  This study showed that the incidence of root fracture was significantly higher in custom cast Ni-Cr post and core system than glass fiber post and composite core system. A more favourable mode of failure was observed in teeth restored with Group II glass fiber post system. Key words:Post-and-core technique, glass fiber post, cast post and-core system, fracture resistance, endodontically treated teeth.
authors.affiliation: M.D.S, Assistant professor. Department of Prosthodontics, Himachal Dental College, Sunder Nagar, H.P, India.
authors.forename: Jasjit
authors.initials: J
authors.lastname: Kaur
authors.affiliation: M.D.S, Reader. Department of Oral Medicine and Radiology, Himachal Dental College, Sunder Nagar, H.P, India.
authors.forename: Navneet
authors.initials: N
authors.lastname: Sharma
authors.affiliation: M.D.S, Prof and head. Department of Prosthodontics, Desh Bhagat Institute of Dental Sciences, Muktsar, Punjab, India.
authors.forename: Harpal
authors.initials: H
authors.lastname: Singh