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In vitro fluoride release from aesthetic resorative materials following recharging with APF gel
Author(s) -
Peng Dong,
Smales Roger J.,
Yip Hak Kong,
Shu Man
Publication year - 2000
Publication title -
australian dental journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.701
H-Index - 71
eISSN - 1834-7819
pISSN - 0045-0421
DOI - 10.1111/j.1834-7819.2000.tb00557.x
Subject(s) - fluoride , nuclear chemistry , chemistry , dentistry , phosphate buffered saline , chromatography , materials science , medicine , inorganic chemistry
In this in vitro study, the fluoride ion release from three more‐viscous conventional glass ionomer cements (GICs) ‐ ChemFlex, Fuji IX GP, lonofil Molar ‐ four polyacid‐modified resin composites (compomers) ‐ Dyract AP, Compoglass F, Freedom, F2000 ‐ and a hybrid resin composite ‐ Ariston pHc ‐ were compared. The amounts of fluoride release from 3b2.7mm specimens were measured over six weeks using a fluoride ion‐selective electrode. After six weeks, the specimens were recharged with 2ml of 1.23 per cent acidulated phosphate fluoride (APF) gel for four minutes. The recharged specimens were then assessed for the amounts of fluoride release over another six weeks. Statistical analyses were performed using one‐way and repeated measures ANOVA. The GICs and Compoglass F showed significantly higher initial fluoride release rates during the first two days (p<0.05). After the first two days, fluoride release rates from all materials dropped quickly and became essentially stabilized within three‐five weeks, in an exponential mode. The recharging of the specimens with APF gel caused a brief, but significant, increase in fluoride release for all materials (p<0.05), before decreasing to previous comparable rates. Compoglass F released relatively more fluoride, and Ariston pHc relatively less, after APF gel application than before. The lowest total amounts over the study were released by Dyract AP and Freedom. The newer compomers, as well as the newer more‐viscous GICs, appear to act as fluoride reservoirs to varying extents.