title: The interaction of polyacid-modified composite resins ('compomers') with aqueous fluoride solutions.
abstract: OBJECTIVE
  The aim of this study was to investigate how the release of fluoride from two compomers and a fluoridated composite resin was affected by exposure to KF solution.
  
  
  METHODS
  Two compomers (Dyract AP and Compoglass F) and one fluoridated composite (Wave) were prepared as discs (6 mm diameter and 2 mm thick), curing with a standard dental lamp. They were then stored in either water or 0.5% KF for 1 week, followed by placement in water for periods of 1 week up to 5 weeks total. Fluoride was determined with and without TISAB (to allow complexed and decomplexed fluoride to be determined), and other ion release (Na, Ca, Al, Si, P) was determined by ICP-OES.
  
  
  RESULTS
  Specimens were found not to take up fluoride from 100 ppm KF solution in 24 h, but to release additional fluoride when stored for up to five weeks. Compomers released more fluoride cumulatively following exposure to KF solution (p<0.001), all of which was decomplexed, though initial (1 week) values were not statistically significant for Dyract AP. Other ions showed no variations in release over 1 week, regardless of whether the specimens were exposed to KF. Unlike the compomers, Wave showed no change in fluoride release as a result of exposure to KF.
  
  
  CONCLUSIONS
  Compomers are affected by KF solution, and release more fluoride (but not other ions) after exposure than if stored in water.
authors.affiliation: School of Science, University of Greenwich, Chatham, United Kingdom.
authors.forename: Reza
authors.initials: R
authors.lastname: Rohani
authors.forename: John W
authors.initials: JW
authors.lastname: Nicholson
mesh_terms: D020770:Compomers / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry; D004347:Drug Interactions; D005459:Fluorides / Q000032:analysis* / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D017736:Ion-Selective Electrodes; D007477:Ions / Q000032:analysis; D017680:Potassium Compounds / Q000737:chemistry*; D012996:Solutions
chemical_list: D020770:Compomers; D003188:Composite Resins; C088486:Dyract; D007477:Ions; D017680:Potassium Compounds; D012996:Solutions; C476992:compoglass flow; C471181:wave flowable composite; C033320:potassium fluoride; D005459:Fluorides