title: Effect of zinc-doping in physicochemical properties of dental adhesives.
abstract: OBJECTIVE
  To evaluate changes in the physicochemical properties, water sorption (WS), solubility (SO), modulus of elasticity (E), ultimate tensile strength (UTS), and microhardness (MH) tests were undertaken in zinc-doped dental adhesives.
  
  
  METHODS
  Two bonding resins, Adper Single Bond Plus (SB) and Clearfil SE Bond (SEB), were zinc-doped by mixing them with 5, 10 or 20 wt% of ZnO powder, or with 1 or 2 wt% ZnCl2. Resin disks were made of each adhesive blend for the evaluation of WS, SO, and MH, and dumbbell-shaped specimens were prepared for E and UTS testing.
  
  
  RESULTS
  An increase in WS and SO was observed for adhesives doped with ZnCl2. A reduction in WS was observed for the adhesive blends containing 10% or 20 wt% ZnO, while the SO was not altered in any of the ZnO-doped adhesives. An increase in E values was observed only for the SB adhesive doped with ZnCl2. For SEB-blends, the incorporation of zinc compounds did not alter the E values. UTS values decreased when SEB was doped with ZnO. SB-blends doped with 20 wt% ZnO significantly increased their MH, and the addition of zinc to the SEB-blends augmented the MH values in all cases.
authors.forename: César
authors.initials: C
authors.lastname: Pomacóndor-Hernández
authors.forename: Raquel
authors.initials: R
authors.lastname: Osorio
authors.forename: Fátima S
authors.initials: FS
authors.lastname: Aguilera
authors.forename: Inmaculada
authors.initials: I
authors.lastname: Cabello
authors.forename: Mario
authors.initials: M
authors.lastname: De Goes
authors.forename: Manuel
authors.initials: M
authors.lastname: Toledano
mesh_terms: D065966:Absorption, Physicochemical; D000327:Adsorption; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D055598:Chemical Phenomena; D002712:Chlorides / Q000737:chemistry; D055119:Elastic Modulus; D006244:Hardness; D006801:Humans; D008422:Materials Testing; D019279:Resin Cements / Q000737:chemistry*; D012995:Solubility; D013314:Stress, Mechanical; D013718:Tensile Strength; D014867:Water; D017967:Zinc Compounds / Q000737:chemistry*; D015034:Zinc Oxide / Q000737:chemistry
chemical_list: D002712:Chlorides; C438313:Clearfil SE Bond; D019279:Resin Cements; C511238:Single Bond Plus; D017967:Zinc Compounds; D014867:Water; D017438:Bisphenol A-Glycidyl Methacrylate; C016837:zinc chloride; D015034:Zinc Oxide