A. Young et al., FLUORIDE RELEASE AND UPTAKE IN-VITRO FROM A COMPOSITE RESIN AND 2 ORTHODONTIC ADHESIVES, Acta Odontologica Scandinavica, 54(4), 1996, pp. 223-228
The aim of this study was to investigate the fluoride release and upta
ke characteristics of a composite resin (Tetric) and two orthodontic a
dhesives (VP 862 and Saga Bond), with a type-II glass ionomer cement (
Ketac Fil) as a control. Test specimens in 2 ml deionized water releas
ed fluoride over a period of 33 days. Ketac Fil released 54 and 15 tim
es more fluoride than Tetric after 24 h and 1 month, respectively, whe
reas the two adhesives released amounts between these values. Specimen
exposure to 1000-ppm NaF solution increased the 24-h fluoride release
from all materials, with near pre-exposure levels reached after 2-3 d
ays. Ketac Fil had a tendency to recharge not seen with the other mate
rials. The ytterbium trifluoride filler in Tetric has a very low water
solubility, and it is therefore suggested that the increases in fluor
ide release from Tetric after exposure to fluoride were most probably
due to release of surface-retained fluoride.