Phytic acid cements

From the practical point of view these results were disappointing, but it was from this unpromising start that the successful glass polyalkenoate cement was eventually developed. 

Cements based on phytic add set more quickly than their glass polyalkenoate or dental silicate cement cormterparts, but have similar mechanical properties (Table 8.2). They are unique among add-base cements in being impervious to acid attack at pH = 2-7. Unfortunately, they share with the dental silicate cement the disadvantage of not adhering to dentine. They do bond to enamel but this is by micromechanical attachment - the cement etches enamel - and not by molecular bonding. Lack of adhesive property is a grave weakness in a modern dental or bone 

Water-leachable material 7 minute cure, % mass 0-88 2-1 0-74 1-25 

Water-leachable material 1 hour cure, % mass 0-40 0-45 0-46 0-70 

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Table 8.2. Properties of cements based on phytic acid Prosser et al, 1983)...

Phytic acid, 40 % PAA 50% Phytic acid, 40 % Cement liquid"... 

Copper(II) oxide and cobalt(II) hydroxide form cements with solutions of many multifunctional organic acids propanetricarboxylic acid, tartaric acid, malic acid, pyruvic acid, mellitic acid, gallic acid, tannic acid and phytic acid (Allen et al., 1984 Prosser et al., 1986). These have been used mainly in cement devices for the sustained release of copper and cobalt (Manston et al., 1985 Mansion Gleed, 1985). Little is known about... 

Prosser, H. J. Wilson, A. D. (1986). The cement-forming properties of phytic acid. In Graf, E. (ed.) Phytic Acid, Chapter 17. Minneapolis, Minnesota Pilatus Press. 

An equally simple chemical study was carried out on phytic acid-aluminosilicate cements (Prosser et al., 1983). Phytic acid, myo-inositol hexakis(dihydrogen phosphate), is a naturally occurring substance found in seeds, and it is a stronger acid than phosphoric acid. Cements were prepared using aqueous solutions of phytic acid, concentrated to 50 wt%, and with 5 wt % zinc dissolved in the acid to moderate the rate of reaction with the glass powder. Discs of cement were prepared and these were... 

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