Water sorption/solubility of self-etching dentin bonding agents

Shuichi Ito, Tomohiro Hoshino, Masahiro Iijima, Naohiro Tsukamoto, David H. Pashley, Takashi Saito

Research output: Contribution to journalArticlepeer-review

52 Scopus citations


Objectives: The purpose of this study was to compare the water sorption/solubility, percent conversion and microtensile bond strength of three single-step self-etching adhesives with those of a two-step self-etching primer adhesive system. Methods. Solvent evaporation from the adhesives was determined gravimetrically. After removal of volatile solvents, the resinswere cast into disks and polymerized. One-half of the disks were incubated in water while the other half were incubated in hexadecane. Repeated measurements of water sorption were made for 10 days followed by drying for 2.5 days to a constant weight. Percent conversion was done using FTIR spectroscopy. Microtensile bond strengths were measured 24h after bonding. Results: All of the adhesives lost 20-30% of their weight after 4min of forced air except for Fluorobond II which lost no weight. All resins stored in water exhibited a time-dependent increase in water sorption and solubility. The resins stored in hexadecane showed very low sorption and solubility. Water sorption was highest for Absolute 2 (20.7%), intermediate for Fluorobond Shake One (10.2%) and lowest for Clearfil 3S (8.9%) and Fluorobond II (7.5%). Percent conversions ranged from a low of 68.3% for Absolute 2 to a high of 87.4% for Clearfil 3S. The two-step self-etching primer adhesive (Fluorobond II) gave the lowest water sorption and lowest solubility of any of the tested adhesives. SEM observations of resin disks incubated in hexadecane looked similar to unincubated controls. Incubating resin disks in artificial saliva covered the surfaces of the resins with mineral crystallites. Significance: Single bottle self-etching adhesives showhigherwater sorption/solubilities than two-step self-etching adhesives. The former products would not be expected to function as well as the latter products.

Original languageEnglish (US)
Pages (from-to)617-626
Number of pages10
JournalDental Materials
Issue number7
StatePublished - Jul 2010


  • Dentin bonding
  • Percent conversion
  • Water solubility
  • Water sorption

ASJC Scopus subject areas

  • Materials Science(all)
  • Dentistry(all)
  • Mechanics of Materials


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