Fluoroaluminosilicate glasses

Akahane, S., Tosaki, S. Hirota, K. (1988). Fluoroaluminosilicate glass powder for dental ionomeric cements. German Patent DE 3,804,469. 

Crisp, S. Wilson, A. D. (1977). Cements comprising acrylic and itaconic acid copolymers and fluoroaluminosilicate glass powder. US Patent 4,016,124. 

Wilson, A. D. Kent, B. E. (1974). Poly(carboxylic acid)-fluoroaluminosilicate glasses surgical cement. US Patent 3,814,717. 

In addition, they contain extra components. Part of the filler phase is made up of particles of fluoroaluminosilicate glass of the type used in glass-ionomer cements. There is also a small quantity of a proprietary acid-functional monomer, the so-called acid resin [ 1 ]. This is not sufficient to allow the monomer to be soluble in water, but it does confer a small degree of hydrophilic character on the set matrix. This causes water from the surroundings to be drawn into the structure, and results in ionization of the acid-functional groups and reaction with the ionomer glass component [38]. Any such reaction is limited, but potentially useful in allowing the set material to release fluoride. 

Figure 10.12 Er +-doped fluoroaluminosilicate glasses have been developed which, on heat treatment above 7g, transform to nano-glass-ceramics. Efficient homogeneous nucleation results in the growth of spherical nanocrystals which are Er +-PbF...2. The figure shows high-resolution transmission electron micrographs of (a) a developed nano-glass-ceramic ( 15 nm diameter) and (b) a quasr-glass-ceramic (2-3 nm diameter) [25].

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