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Fluoride release by silicate cements and composite resins
Author(s) -
FORSTEN LENNART,
PAUNIO ILKKA K.
Publication year - 1972
Publication title -
european journal of oral sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.802
H-Index - 93
eISSN - 1600-0722
pISSN - 0909-8836
DOI - 10.1111/j.1600-0722.1972.tb00322.x
Subject(s) - fluoride , hydroxylapatite , apatite , composite number , silicate , chemistry , acrylic resin , nuclear chemistry , dentistry , materials science , mineralogy , inorganic chemistry , composite material , organic chemistry , medicine , enzyme , coating
– The purpose of the study was to determine the fluoride content of acrylic and composite resins and to study the release of fluoride from these materials in comparison to the release from silicates. The analytical results showed that one composite contained approximately the same amount of fluoride as is generally reported for silicates. The other resins contained none or only minimal amounts of fluoride. The release of fluoride was studied by measuring the uptake of fluoride by synthetic hydroxylapatite. Rectangular test specimens, 2 × 2 × 12 mm, made of the fluoride‐containing resin were shaken in a neutral (pH 6.8) and an acidic (pH 5.8) solution with the hydroxylapatite for 7 weeks. The apatite was analyzed for fluoride each week and the test specimens were then transferred to a fresh solution with new apatite. As a control, a composite without fluoride was studied in the same way. For comparison two silicate cements were also included in the study. The results show that, during the first week, the uptake of fluoride by the apatite was greater from the silicates than it was from the composite. After that period the uptake continued at a lower level and did not show any marked decrease during the observation period. This continued uptake was about the same from both the silicates and the composite.