title: In vitro comparative evaluation of the effect of two different fiber reinforcements on the fracture toughness of provisional restorative resins.
abstract: BACKGROUND
  Fracture of provisional fixed partial denture (FPD) may jeopardize the success of provisional prosthodontic treatment phase and cause patient discomfort.
  
  
  OBJECTIVE
  The aim of this study was to compare the fracture toughness of the Polymethyl Methacrylate (PMMA) resin and Bis-Acryl Composite (BAC) resin reinforced with the Polyethylene and Glass fibers.
  
  
  METHODS
  Three groups (N=10) of each of the two materials were prepared for the fracture toughness test. Two groups had the different reinforcements and group without reinforcement served as the control. The mean fracture toughness (MPa.m½ ) was compared by One-way ANOVA, followed by the Scheffe analysis. Fracture toughness between fiber-reinforced PMMA and BAC resin was compared by the independent samples t test.
  
  
  RESULTS
  For the controls, the fracture toughness for PMMA resin (0.91) was significantly lower than for the BAC resin (1.19). Glass fiber reinforcement produced significantly higher fracture toughness for both, PMMA (1.48) and BAC (1.82) resin, but the Polyethylene fibers did not (0.95 for PMMA and 1.23 for BAC resin). Among the reinforced groups, Silane impregnated Glass fibers showed highest fracture toughness for the BAC resin (1.82).
  
  
  CONCLUSIONS
  Of two fiber reinforcement methods evaluated, Glass fiber reinforcement for the PMMA and BAC resin produced highest fracture toughness.
  
  
  CONCLUSIONS
  On the basis of this in--vitro study, the use of Glass and Polyethylene fibers tested may be an effective way to reinforce resins used to fabricate fixed provisional restorations.
authors.affiliation: Department of Prosthodontics, VSPM's Dental College and Research Center, Nagpur, India.
authors.forename: Vaibhav D
authors.initials: VD
authors.lastname: Kamble
authors.forename: Rambhau D
authors.initials: RD
authors.lastname: Parkhedkar
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D003799:Dental Stress Analysis / Q000295:instrumentation; D005898:Glass / Q000737:chemistry*; D006358:Hot Temperature; D006801:Humans; D008422:Materials Testing; D020959:Polyethylene / Q000737:chemistry*; D058105:Polymerization; D019904:Polymethyl Methacrylate / Q000737:chemistry; D012821:Silanes / Q000737:chemistry; D012965:Sodium Chloride / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013997:Time Factors
chemical_list: D000180:Acrylic Resins; D003188:Composite Resins; D003764:Dental Materials; D012821:Silanes; C009753:fiberglass; D012965:Sodium Chloride; D020959:Polyethylene; D019904:Polymethyl Methacrylate; C069714:Protemp