title: Flexural and bond strengths of relined denture polymers assessed by four-point bending tests and Weibull analysis.
abstract: OBJECTIVE
  The aim of this study was to (1) investigate the flexural strengths of three denture resins i.e. heat, photopolymerised and microwaved and how it was affected by relining with auto- and visible light-polymerised hard reliners, (2) investigate the bond strengths between denture resins and hard reliners and (3) interpret the results of both tests by utilising Weibull analysis.
  
  
  METHODS
  Specimens (65 × 10 × 2.5 mm) from denture resins, relined and bonded combinations were tested using a four-point bending test in a universal testing machine and a crosshead speed of 5 mm/min. Ten specimens for each bulk resin and denture resin-reliner combination for a total of 150 were tested.
  
  
  RESULTS
  Statistical analysis indicated significant differences between bulk materials (p < 0.001) and between reliners (p < 0.001) for flexural and bond strength tests.
  
  
  CONCLUSIONS
  was concluded that (1) the four-point flexural strength was different between the denture base materials, (2) flexure strength between bulk and relined or between relined with autopolymerised and photopolymerised bases was different, (3) flexural strength among relined denture bases was different and (4) bond strengths among relined denture bases were different.
authors.affiliation: Department of Prosthodontics, Division of Removable Prosthodontics, Dental School, University of Athens, Athens, Greece. grepolyz@dent.uoa.gr
authors.forename: Gregory L
authors.initials: GL
authors.lastname: Polyzois
authors.forename: Panagiotis E
authors.initials: PE
authors.lastname: Lagouvardos
authors.forename: Maria J
authors.initials: MJ
authors.lastname: Frangou
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D017554:Carbon Compounds, Inorganic / Q000737:chemistry; D001840:Dental Bonding; D045662:Dental Etching / Q000379:methods; D003764:Dental Materials / Q000737:chemistry*; D003799:Dental Stress Analysis / Q000295:instrumentation; D003819:Denture Bases; D003822:Denture Liners; D003823:Denture Rebasing; D006358:Hot Temperature; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008768:Methylmethacrylates / Q000737:chemistry; D008872:Microwaves; D055668:Photochemical Processes; D018583:Pliability; D058105:Polymerization; D019904:Polymethyl Methacrylate / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry; D017655:Silicon Compounds / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D014867:Water / Q000737:chemistry
chemical_list: D000180:Acrylic Resins; D017554:Carbon Compounds, Inorganic; D003764:Dental Materials; C074498:Futur Acryl 2000; D008689:Methacrylates; D008768:Methylmethacrylates; C441199:Microbase; D011140:Polyurethanes; D017655:Silicon Compounds; D014867:Water; C060386:Triad resin; C029824:urethane dimethacrylate luting resin; C009931:poly(ethylmethacrylate); D019904:Polymethyl Methacrylate; C022088:silicon carbide