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Fluoride release/uptake of polyacid‐modified resin composites (compomers) in neutral and acidic buffer solutions
Author(s) -
Attin T.,
Buchalla W.,
Siewert C.,
Hellwig E.
Publication year - 1999
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1046/j.1365-2842.1999.00413.x
Subject(s) - fluoride , buffer (optical fiber) , dentifrice , saliva , chemistry , slurry , nuclear chemistry , dentistry , buffer solution , composite material , materials science , chromatography , inorganic chemistry , medicine , biochemistry , telecommunications , computer science
The aim of the present study was to evaluate the fluoride uptake/release of polyacid‐modified resin composites (compomers) in neutral and acidic buffer solutions. Two compomers (Dyract ® and Compoglass ® ) were tested and the conventional glass–ionomer cement (GIC) Vivaglass Base ® served as a control. Forty specimens were fabricated from each of the respective materials. Twenty of these specimens were placed in artificial saliva and the other 20 specimens in a fluoridated dentifrice slurry for 5 min. Then, 10 fluoridated and 10 non‐fluoridated specimens were immersed in a neutral buffer solution (pH 6·8), and the other specimens were immersed in an acidic solution (pH 4·0). After 1, 2, 3, 4, and 5 days the samples were again placed in either a fluoridated dentifrice slurry or saliva for 5 min, after which time they were transferred to fresh buffer solutions. The fluoride content of the solutions was assessed with a fluoride sensitive electrode. Fluoride release from all the materials decreased continuously during the experiment, with a significantly higher release in the acidic solution compared to the neutral buffer solution. Fluoridation did not result in an increased fluoride release for the compomers. However, the conventional GIC revealed a significantly higher fluoride release after fluoridation. It is concluded that Dyract ® and Compoglass ® can not be replenished with fluoride, irrespective of the pH value of the environment.