title: Is fracture resistance of endodontically treated mandibular molars restored with indirect onlay composite restorations influenced by fibre post insertion?
abstract: OBJECTIVE
  The aim of this study was to investigate the influence of post placement on fracture resistance of endodontically treated mandibular molars restored with adhesive overlay restorations.
  
  
  METHODS
  Endodontically treated human molars with two- and one-wall cavities either underwent or did not undergo fibre post insertion within composite build-up before cementation of indirect composite onlay restorations. The specimens were thermocycled, exposed to cyclic loading, and submitted to the static fracture resistance test. Fracture loads and mode of failure were evaluated.
  
  
  RESULTS
  Statistical analysis revealed that specimens with fibre posts demonstrated similar failure loads (p=0.065) but more favourable fracture patterns compared with specimens without fibre posts. No difference was found between two- and one-wall cavities.
  
  
  CONCLUSIONS
  Within the limitations of this study, the insertion of fibre posts did not improve support under indirect composite overlays.
  
  
  CONCLUSIONS
  When restoring heavily broken down endodontically treated mandibular molars with an indirect overlay composite restoration, the fibre post inserted within the composite build-up do not provide any increase in fracture resistance.
authors: University of Turin Dental School, Department of Cariology and Operative Dentistry, via Nizza 230, 10126 Turin, Italy. nicola.scotti@unito.it
authors: Nicola
authors: N
authors: Scotti
authors: Francesco Andrea
authors: FA
authors: Coero Borga
authors: Mario
authors: M
authors: Alovisi
authors: Riccardo
authors: R
authors: Rota
authors: Damiano
authors: D
authors: Pasqualini
authors: Elio
authors: E
authors: Berutti
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D003188:Composite Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D017267:Dental Prosthesis Design; D003799:Dental Stress Analysis / Q000295:instrumentation; D017220:Dentin-Bonding Agents / Q000737:chemistry; D006801:Humans; D007284:Inlays; D055115:Light-Curing of Dental Adhesives; D008334:Mandible; D008689:Methacrylates / Q000737:chemistry; D008963:Molar / Q000503:physiopathology*; D010756:Phosphoric Acids / Q000737:chemistry; D058105:Polymerization; D011176:Post and Core Technique / Q000295:instrumentation*; D019279:Resin Cements / Q000737:chemistry; D018915:Root Canal Preparation / Q000379:methods; D013314:Stress, Mechanical; D013696:Temperature; D013997:Time Factors; D014082:Tooth Fractures / Q000503:physiopathology*; D019553:Tooth, Nonvital / Q000503:physiopathology* / Q000628:therapy; D014867:Water / Q000737:chemistry
chemical_list: C074864:All-Bond system; D003188:Composite Resins; D003764:Dental Materials; D017220:Dentin-Bonding Agents; D008689:Methacrylates; C469607:OptiBond FL; D010756:Phosphoric Acids; D019279:Resin Cements; C488393:Venus (composite resin); D014867:Water; C030242:phosphoric acid