title: In vitro comparison of fluoride release of six direct core materials.
abstract: BACKGROUND
  Fluoride has been shown to deter caries and has been incorporated into core build-up materials. However, there is considerable variation in the formulation and release of fluoride from core build-up materials.
  
  
  OBJECTIVE
  This in vitro study compared the fluoride released by 6 commercially available fluoride-releasing core materials over time.
  
  
  METHODS
  Ten specimen disks (9 for Corestore) of each of the 6 core materials were fabricated, finished, measured, and immersed in deionized water in individual polystyrene jars. The jars were stored in a humidor at 37 degrees C between test periods. At the same time each day for 7 consecutive days, then at days 14, 22, 28, 59, and 89, the fluoride release was measured from each specimen disk in parts per million by testing the storage medium. The data were analyzed using 1-way ANOVA and Tukey-Kramer multiple comparison tests (P <.05).
  
  
  RESULTS
  Five of the 6 core build-up materials tested showed an initial high concentration of fluoride release during the first day and gradually tapered over the study period. Fuji II LC consistently released more fluoride than any other material throughout the 89-day testing period.
  
  
  CONCLUSIONS
  Fuji II LC released the most fluoride and was significantly different from the other materials tested. The maximum amount of fluoride was released by 5 of the 6 materials during the first 24 hours and gradually tapered over the 89-day testing period.
authors.affiliation: Virginia Commonwealth University, School of Dentistry, Richmond, VA 23298-0566, USA.
authors.forename: R I
authors.initials: RI
authors.lastname: Galvan
authors.forename: F J
authors.initials: FJ
authors.lastname: Robertello
authors.forename: T A
authors.initials: TA
authors.lastname: Lynde
mesh_terms: D000704:Analysis of Variance; D002138:Calibration; D003764:Dental Materials / Q000737:chemistry*; D005459:Fluorides / Q000032:analysis*; D066298:In Vitro Techniques; D008422:Materials Testing / Q000379:methods / Q000706:statistics & numerical data; D011176:Post and Core Technique / Q000706:statistics & numerical data; D013997:Time Factors
chemical_list: D003764:Dental Materials; D005459:Fluorides