7Benham AW, Campbell PM, Buschang PH. Effectiveness of pit and fissure sealants in reducing white spot lesions during orthodontic treatment. A pilot study. Angle Orthod,2009,79(2) :338-345.
8Kuwetli SS, Tuna EB, Cildir SK, et al. Evaluation of the fluoride release from orthodontic band eements. Am J Dent, 2006, 19 (5) : 275 -278.
9Diniz V, Weber ME, Volesky B, et al. Column biosorption of lanthanum and europium by Sargassum. Water Res, 2008,42 ( 1-2 ) : 363 -371.
10Mayer I, Layani JD, Givan A, et al. La ions in precipitated hydroxyapatites. J Inorg Biochem, 1999,73 (4) :221-226.