Influence of One-Piece (Monoblock) Fibreglass Post Design on the Fracture Resistance of Extensively Damaged Teeth: An Ex vivo Study

Abstract

Aims: This study compared fracture resistances of roots restored with one-piece (monoblock) fibreglass post systems having different designs. Study Design: Original Research Paper Place and Duration of Study: Hacettepe University, Faculty of Dentistry, Department of Prosthodontics, between June 2013 and July 2014. Methodology: Thirty natural teeth were endodontically treated and the canal walls were flared using a taper diamond bur. The roots were randomly assigned into three groups (n=10) as Mono Core Fibre Post (MFP), Fit Fibre Post (FFP), and Conventional Fibre Post (CFP), which served as control. All posts were luted with resin cement and zirconia substructures were fabricated. Each sample was subjected to thermal-cycling (6000 times between 5- 55°C) and then the samples were loaded in a universal testing machine until failure occured. Results: The mean of failure loads of MFP, CFP, and FFP were 315.8 N, 218.7 N and 146 N, respectively (P<0.05). 40% root fracture was observed in MFP group. Decementation was found in 90% of samples in FFP, and 40% in MFP and CFP. Conclusion: This in vitro study showed that fiber post designs have an influence on fracture resistance and failure mode.