2009-sol–gel Nb2O5.pdfVIP

J Mater Sci: Mater Med (2009) 20:1781–1785 DOI 10.1007/s10856-009-3748-7 Preparation and evaluation of an experimental luting glass ionomer cement to be used in dentistry M. J. Bertolini Æ M. A. Zaghete Æ R. Gimenes Æ G. C. Padovani Æ C. A. S. Cruz Received: 24 March 2008 / Accepted: 6 April 2009 / Published online: 5 May 2009 Springer Science+Business Media, LLC 2009 Abstract The aim of this paper is to compare the fluo- powder modified by the niobium can lead the formation of ride-releasing and mechanical properties of an experi- the polysalt matrix with good mechanical properties. In mental luting glass ionomer cement, which has a modified other words, we can say that experimental powder offered composition and a commercial luting cement. The experi- considerable promise for exploitation in dental field. mental powder was obtained by sol–gel process and then, it was used to prepare the experimental cements. The prop- erties of cement pastes, such as setting time and working time, microhardness and diametral tensile strength were 1 Introduction determined. Fluoride release from GICs was evaluated at time intervals of 1, 7, 14, 21 and 28 days in deionized Several dental restorative materials containing fluoride, water. Atomic force microscopy (AFM) analyses showed such as glass polyalkenoate cements or glass ionomer that the surface of the experimental cements is more cements (GICs), have been developed and these materials homogeneous than commercial GICs. The mechanical are available on the market due to their attractive properties properties and the measure of liberation of fluoride of the for use in Dentistry, such as the continuous release of two cements were influenced by ratio p