Maturation affects fluoride uptake by glass-ionomer dental cements
Nicholson, John W. and Czarnecka, Beata (2012) Maturation affects fluoride uptake by glass-ionomer dental cements. Dental Materials, 28 (2). e1-e5. ISSN 0109-5641 (doi:10.1016/j.dental.2011.10.011)
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Objectives. Four commercial glass-ionomer cements have been studied for their ability to
take up fluoride from aqueous solution following variable maturation times in the dry at
37 ◦C.Methods. Sets of five specimens of four different materials were cured for times of 10 min,
24 h and 1 month, then transferred to a neutral solution of NaF at approximately 1000 ppm in
fluoride. Fluoride concentration was then measured at regular time intervals up to 1 month
using a fluoride ion selective electrode.
Results. Specimens cured for 1 month showed little or no uptake over 24 h, specimens cured
for 24 h showed fluctuating uptake over time, and specimens cured for 10 min showed the
greatest fluoride uptake. For the latter specimens, simple kinetic models were found to
apply in two cases (pseudo-first order and pseudo-second order for Chemflex and Ketac
Molar Quick respectively).
Significance. The ability to take up fluoride has been shown to decline with age of cement
which suggests that in clinical use glass-ionomers may become less effective at undergoing
fluoride recharge than has been previously assumed.
|Uncontrolled Keywords:||glass ionomer, fluoride, uptake, maturation|
|Subjects:||R Medicine > RK Dentistry|
|School / Department / Research Groups:||School of Science|
School of Science > Department of Pharmaceutical, Chemical & Environmental Sciences
|Last Modified:||09 Feb 2012 16:39|
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