title: Influence of initial water content on the subsequent water sorption and solubility behavior in restorative polymers.
abstract: OBJECTIVE
  To evaluate the water sorption characteristics and solubility behavior of two resin-based composites, an ormocer, a compomer and a resin-modified glass-ionomer, according to ISO 4049 specifications and also without the initial desiccation cycle.
  
  
  METHODS
  After polymerization, five disks (15 x 1 mm) of each material [Filtek P60 (P60), Solitaire 2 (SOL2), Admira (ADM), Compoglass F (COF) and Fuji II LC (FLC)] were desiccated until a constant mass (ml) was obtained. They were immersed in distilled water for 7 days and immediately weighed after that period (mass m2). Then disks were again desiccated and weighed every day for 35 days (mass m3). Sorption and solubility values were deduced from these different measures. Without initial desiccation mass m1 was obtained just after polymerization.
  
  
  RESULTS
  Without initial desiccation, all the materials absorbed less water and solubility was 1.5 to 8 times greater than in standard experiment. For the two protocols, water sorption and solubility were significantly greater in FLC, and ADM showed the least weight loss of all the materials tested.
authors.affiliation: Laboratory of Physics of Materials, UMR CNRS-INPL, Mine School, Nancy, France.
authors.forename: Eric
authors.initials: E
authors.lastname: Mortier
authors.forename: David A
authors.initials: DA
authors.lastname: Gerdolle
authors.forename: Abdelsellam
authors.initials: A
authors.lastname: Dahoun
authors.forename: Marc M
authors.initials: MM
authors.lastname: Panighi
mesh_terms: D000042:Absorption; D000704:Analysis of Variance; D002516:Ceramics / Q000737:chemistry; D020770:Compomers / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D003793:Dental Restoration, Permanent / Q000379:methods*; D003890:Desiccation; D005899:Glass Ionomer Cements / Q000737:chemistry; D008422:Materials Testing; D063225:Organically Modified Ceramics; D011108:Polymers / Q000737:chemistry*; D012821:Silanes / Q000737:chemistry; D012995:Solubility; D018709:Statistics, Nonparametric; D014867:Water
chemical_list: D020770:Compomers; D003188:Composite Resins; D005899:Glass Ionomer Cements; D063225:Organically Modified Ceramics; D011108:Polymers; D012821:Silanes; D014867:Water