Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9778206 | Journal of Non-Crystalline Solids | 2005 | 6 Pages |
Abstract
Glass ionomer cements (GICs) are glass and polymer composite materials. These materials currently find use in the dental field. The purpose of this work is to obtain systems based on composition 4.5SiO2-3Al2O3-XNb2O5-2CaO to be used in Dentistry. The systems were prepared by chemical route at 700 °C. The results obtained by XRD and DTA showed that all systems prepared are glasses. The structures of the obtained glasses were compared to commercial material using 27Al and 29Si MAS NMR. The analysis of MAS NMR spectra indicated that the systems developed and commercial material are formed by SiO4 and AlO4 linked tetrahedra. The properties of glass ionomer cements based on the glasses prepared with several niobium contents were studied. Setting and working times of the cement pastes, microhardness and diametral tensile strength were evaluated for the experimental GICs and commercial luting cements. It was concluded that setting time of the cement pastes increased with increasing niobium content of the glasses (X). The properties to the GICs such as setting time and microhardness were influenced by niobium content.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Márcio José Bertolini, Regina Guenka Palma-Dibb, Maria Aparecida Zaghete, Rossano Gimenes,