title: Comparative Evaluation of Push Out Bond Strength of a Fiber Post System using Four Different Resin Cements: An In-Vitro Study.
abstract: BACKGROUND
  Debonding is one of the frequent causes of failure experienced in fiber-reinforced composite posts, and establish along post space-dentin adhesive interface. The purpose of this study was to assess push-out bond strength of a fiber-reinforced post system using four different resin cements.
  
  
  METHODS
  In this in-vitro study 40 mandibular premolars were decoronated, and roots were treated endodontically. Following the post space preparation, the roots were grouped into four groups of 10 specimens each. Fiber-reinforced composite posts were cemented with four resin cement systems: (a) Multilink Speed, (b) Rely X Unicem, (c) Calibra, and (d) Permaflo DC. Three sections of each root, with a thickness of 3 mm, were prepared. The push-out test was with a universal testing machine at a crosshead speed of 1 mm/min, and bond strength values were evaluated. The data were analyzed with using multivariate analysis of variance (MANOVA) and post-hoc Scheffe test.
  
  
  RESULTS
  The mean push-out bond strength was highest for Rely X Unicem (18.0 ± 1.81), followed by Multilink Speed (13.1 ± 0.75) and Permaflo DC (12.8 ± 0.95). The lowest mean push-out bond strength was seen with Calibra (11.8 ± 0.69). There were statistically significant differences seen in the push-out bond strength of resin cement in different root canal regions using MANOVA and post-hoc Scheffe test.
  
  
  CONCLUSIONS
  Mean push-out bond strength was highest for Rely X Unicem, followed by Multilink Speed and Permaflo DC. Lowest mean push-out bond strength was seen with respect to Calibra.
authors.affiliation: Post-graduate Student, Department of Prosthodontics including Crown and Bridge and Implantology, M R Ambedkar Dental College and Hospital, Bengaluru, Karnataka, India.
authors.forename: Anshuraj Kopal Ashok Kumar
authors.initials: AK
authors.lastname: Das
authors.affiliation: Reader, Department of Prosthodontics including Crown and Bridge and Implantology, M R Ambedkar Dental College and Hospital, Bengaluru, Karnataka, India.
authors.forename: B C
authors.initials: BC
authors.lastname: Muddugangadhar
authors.affiliation: Professor and Head, Department of Prosthodontics including Crown and Bridge and Implantology, M R Ambedkar Dental College and Hospital, Bengaluru, Karnataka, India.
authors.forename: G S
authors.initials: GS
authors.lastname: Amarnath
authors.affiliation: Post-graduate Student, Department of Prosthodontics including Crown and Bridge and Implantology, M R Ambedkar Dental College and Hospital, Bengaluru, Karnataka, India.
authors.forename: Ashu
authors.initials: A
authors.lastname: Garg
authors.affiliation: Post-graduate Student, Department of Prosthodontics including Crown and Bridge and Implantology, M R Ambedkar Dental College and Hospital, Bengaluru, Karnataka, India.
authors.forename: Ullash
authors.initials: U
authors.lastname: Kumar
authors.affiliation: Post-graduate Student, Department of Prosthodontics including Crown and Bridge and Implantology, M R Ambedkar Dental College and Hospital, Bengaluru, Karnataka, India.
authors.forename: T R Poonam
authors.initials: TR
authors.lastname: Rao
keywords: Fiber post; push out; resin cement