Influence of glass composition on the properties of glass polyalkenoate cements. Part III: influence of fluorite content

Abstract

The influence of fluorite content of the glass on the formation and properties of glass polyalkenoate cements was investigated. A series of glass powders based on 1.5SiO2 x 0.5P2O5 x Al2O3 x CaO x XCaF2 were synthesised. The glass transition temperature of the glass fell with increasing fluorite content. Setting and working times of the cement pastes decreased with increasing fluorite content of the glass. Compressive strength and un-notched fracture strength increased with increasing fluorite content of the glass. Fracture toughness and toughness of the cements were relatively insensitive to fluorite content.

MAS-NMR spectroscopy studies in the setting reaction of glass ionomer cements

“…More detailed changes observed in 13 setting times together with their original glasses. Generally, broad symmetrical peaks are observed for the original glasses around À87 to À90 ppm, which are assigned to Si in the SiO 4 tetrahedra forming the silicate network structure.…”

“…The composition of these glasses is very close to the glass compositions used for the commercial glass ionomer cements and their use in forming glass ionomer cements has also been investigated. It has been reported, that the properties of glass ionomer cements are influenced by the glass composition, for example the Al/Si 11 and Ca/P 12 ratios, the fluorite 13 and fluorine content. 14 In addition, the substitution of oxygen for fluorine results in significantly decreasing the setting time even at low fluorine concentrations.…”

Development of an experimental glass ionomer cement containing niobium and fluoride

“…The glasses based on the systems SiO 2 -Al 2 O 3 -CaO or SiO 2 -Al 2 O 3 -CaO-CaF 2 are used for the formation of polyalkenoate cements or glass ionomer cements (GICs) for dental applications [1][2][3] as a material for the restoration of anterior and posterior teeth, a cementing agent for the attachment of stainless steel crowns and bridges and as liners and bases. The properties which contributed to the great acceptance of GICs are adhesion to mineralized tissues, good biocompatibility, ability to bond chemically to tooth and release fluoride ions to confer resistance against secondary caries [4,5].…”

Effect of storage time and chlorhexidine addition on the mechanical properties of glass ionomer cements

“…The strength of GICs is influenced by their composition. High content of fluoride or zinc increases the ability of GIC form a network with acrylic acid and decreased the setting time, induced a higher compressive and flexural strength 33 . Superior flexural and compressive strengths have been reported for Ketac Molar in comparison to Vitromolar 1 , similar to those found in the present study.…”