title: Reducing composite restoration polymerization shrinkage stress through resin modified glass-ionomer based adhesives.
abstract: The aim of this study was to determine whether employing resin modified glass-ionomer based adhesives can reduce polymerization contraction stress generated at the interface of restorative composite adhesive systems.
  
  
  
  Five resin based adhesives (G Bond, Optibond-All-in-One, Optibond-Solo, Optibond-XTR and Scotchbond-Universal) and two resin modified glass-ionomer based adhesives (Riva Bond-LC, Fuji Bond-LC) were analysed. Each adhesive was applied to bond restorative composite Filtek-Z250 to opposing acrylic rods secured within a universal testing machine. Stress developed at the interface of each adhesive-restorative composite system (n = 5) was calculated at 5-minute intervals over 6 hours.
  
  
  
  The resin based adhesive-restorative composite systems (RBA-RCS) demonstrated similar interface stress profiles over 6 hours; initial rapid contraction stress development (0-300 seconds) followed by continued contraction stress development ≤0.02MPa/s (300 seconds - 6 hours). The interface stress profile of the resin modified glass-ionomer based adhesive-restorative composite systems (RMGIBA-RCS) differed substantially to the RBA-RCS in several ways. Firstly, during 0-300 seconds the rate of contraction stress development at the interface of the RMGIBA-RCS was significantly (p < 0.05) lower than at the interface of the RBA-RCS. Secondly, at 300 seconds and 6 hours the interface contraction stress magnitude of the RMGIBA-RCS was significantly (p < 0.05) lower than the stress of all assessed RBA-RCS. Thirdly, from 300 seconds to 6 hours both the magnitude and rate of interface stress of the RMGIBA-RCS continued to decline over the 6 hours from the 300 seconds peak.
  
  
  
  The use of resin modified glass-ionomer based adhesives can significantly reduce the magnitude and rate of polymerization contraction stress developed at the interface of adhesive-restorative composite systems.
authors.affiliation: Faculty of Dentistry, The University of Sydney, New South Wales.
authors.forename: S J
authors.initials: SJ
authors.lastname: Naoum
authors.affiliation: Faculty of Dentistry, The University of Sydney, New South Wales.
authors.forename: P R
authors.initials: PR
authors.lastname: Mutzelburg
authors.affiliation: Faculty of Dentistry, The University of Sydney, New South Wales.
authors.forename: T G
authors.initials: TG
authors.lastname: Shumack
authors.affiliation: Faculty of Dentistry, The University of Sydney, New South Wales.
authors.forename: Djg
authors.initials: D
authors.lastname: Thode
authors.affiliation: Faculty of Dentistry, The University of Sydney, New South Wales.
authors.forename: F E
authors.initials: FE
authors.lastname: Martin
authors.affiliation: Faculty of Dentistry, The University of Sydney, New South Wales.
authors.forename: A E
authors.initials: AE
authors.lastname: Ellakwa
mesh_terms: D000180:Acrylic Resins; D000269:Adhesives / Q000737:chemistry; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D003738:Dental Cements / Q000737:chemistry; D003764:Dental Materials / Q000737:chemistry*; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D058105:Polymerization; D019279:Resin Cements / Q000737:chemistry; D012822:Silicon Dioxide
chemical_list: D000180:Acrylic Resins; D000269:Adhesives; D003188:Composite Resins; D003738:Dental Cements; D003764:Dental Materials; C444701:Filtek Z250; C498353:G-Bond; D005899:Glass Ionomer Cements; D008689:Methacrylates; C428805:OptiBond SOLO; C092987:Optibond; D019279:Resin Cements; C015897:glass ionomer; C084541:Fuji glass-ionomer lining cement; D017438:Bisphenol A-Glycidyl Methacrylate; D012822:Silicon Dioxide; C041330:Scotchbond
keywords: Dentine bonding; Riva Bond LC; polymerization shrinkage; resin composite; resin modified glass-ionomer