title: Influence of pH and storage time on the sorption and solubility behaviour of three composite resin materials.
abstract: OBJECTIVE
  The aim of this study was to determine whether pH and time has any influence on the sorption and solubility behaviour of composite resin materials stored in a buffer solution.
  
  
  METHODS
  Three hybrid composite restorative resin materials (Spectrum, Z-100 and ArtGlass) with different matrix structure and filler composition were studied. One hundred and twenty specimens of each material were produced according to ISO 4049. The materials were stored in McIlvain's buffer solution at different pH (4, 6 and 8) at 1, 7, 60 and 180 days. pH measurements were carried out before and after completed storage.
  
  
  RESULTS
  Time had a significant influence on the sorption and solubility behaviour of the composite resin materials tested. One of the materials Z-100 showed a significant mass increase and/or decrease depending on the pH of the solution. The material Spectrum was significantly influenced by pH, resulting in different sorption depending on the pH of the solution.
  
  
  CONCLUSIONS
  Time of storage was important for the sorption and solubility behaviour of the composite resin materials tested. Comparison of solubility for one of the materials showed twice as high values in the present study as previously reported when distilled water was used as storage medium. pH in the solution seems to have an influence on the sorption and solubility behaviour of composite resin materials. The sensitivity of the sorption and solubility behaviour to time and pH of the materials tested seems to be related to the hydrophilicity of the matrix and the chemical composition of the filler.
authors.affiliation: Göteborg University, Faculty of Odontology, Department of Prosthetic Dentistry/Dental Materials Science, Box 450, 405 30, Göteborg, Sweden. ortengren@odontologi.gu.se
authors.forename: U
authors.initials: U
authors.lastname: Ortengren
authors.forename: F
authors.initials: F
authors.lastname: Andersson
authors.forename: U
authors.initials: U
authors.lastname: Elgh
authors.forename: B
authors.initials: B
authors.lastname: Terselius
authors.forename: S
authors.initials: S
authors.lastname: Karlsson
mesh_terms: D000042:Absorption; D002021:Buffers; D003188:Composite Resins / Q000737:chemistry*; D004356:Drug Storage; D005899:Glass Ionomer Cements / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D008422:Materials Testing; D012823:Silicate Cement / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D012995:Solubility; D018709:Statistics, Nonparametric; D013997:Time Factors; D014867:Water / Q000737:chemistry; D015040:Zirconium / Q000737:chemistry
chemical_list: D002021:Buffers; D003188:Composite Resins; D005899:Glass Ionomer Cements; C420128:Spectrum composite resin; C083568:Z100 composite resin; C111282:dental polyglass; D014867:Water; D012823:Silicate Cement; D012822:Silicon Dioxide; D015040:Zirconium