en ترمیمی Cosmetic and Restorative Dentistry پژوهشي Research Objectives <p> 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<img alt="AWT IMAGE" src="webfiles/images/transparent.gif" width="4" height="1" >°C.</p>Methods <p> Sets of five specimens of four different materials were cured for times of 10<img alt="AWT IMAGE" src="webfiles/images/transparent.gif" width="4" height="1" >min, 24<img alt="AWT IMAGE" src="webfiles/images/transparent.gif" width="4" height="1" >h and 1 month, then transferred to a neutral solution of NaF at approximately 1000<img alt="AWT IMAGE" src="webfiles/images/transparent.gif" width="4" height="1" >ppm in fluoride. Fluoride concentration was then measured at regular time intervals up to 1 month using a fluoride ion selective electrode.</p>Results <p> Specimens cured for 1 month showed little or no uptake over 24<img alt="AWT IMAGE" src="webfiles/images/transparent.gif" width="4" height="1" >h, specimens cured for 24<img alt="AWT IMAGE" src="webfiles/images/transparent.gif" width="4" height="1" >h showed fluctuating uptake over time, and specimens cured for 10<img alt="AWT IMAGE" src="webfiles/images/transparent.gif" width="4" height="1" >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).</p>Significance <p> 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.</p><hr><p></p><p> <strong> Source: </strong>Dental Materials </p><p><a href="http://www.demajournal.com/article/S0109-5641(11)00888-8/abstract" target="_blank"><font color="#0000cc">  Full text </font></a></p> Glass ionomer, Fluoride, Uptake, Maturation 0 0 http://idai.ir/browse.php?a_code=A-10-32-260&slc_lang=en&sid=1 • John • W. Nicholson 10031947532846001049 10031947532846001049 Yes • Beata • Czarnecka 10031947532846001050 10031947532846001050 No