Cement, liquid

Dental cement Liquid Powder base Material Matrix Uses... 

CELLULOID, IN BLOCKS, RODS, ROLLS, SHEETS, TUBES, ETC. CEMENT, LIQUID, n.O.S. 

Bad-kasten, m. (electrolytic) cell, -nitrieren, n. Metal.) fused-salt nitriding, -patentieren, n. Wire) patenting with cooling in a lead or salt bath, -spannung, /. bath tension, cell voltage, -Spiegel, m, bath level, bath surface, -zementieren, n. Metal.) bath cementation, liquid carburizing,... 

O Neill, I. K., Prosser, H. J., Richards, C. P. Wilson, A. D. (1982). NMR spectroscopy of dental materials. I. P studies on phosphate-bonded cement liquids. Journal of Biomedical Materials Research, 16, 39-49. 

Bertenshaw, B. W. Combe, E. C. (1972a). Studies on polycarboxylates and related cements. I. Analysis of cement liquids. Journal of Dental Research, 1, 13-16. 

Crisp, S. Wilson, A. D. (1976). Reactions in glass ionomer cements. V. Effect of incorporating tartaric acid in the cement liquid. Journal of Dental Research, 55, 1023-31. 

Dental silicate cement liquids are concentrated aqueous solutions of orthophosphoric acid generally containing aluminium and zinc (Wilson, Kent Batchelor, 1968 Kent, Lewis Wilson, 1971a,b Wilson et al., 1972). The optimum orthophosphoric acid concentration is 48 to 55 % by mass (Wilson et al, 1970a), although higher concentrations are encountered. Aluminium is present as phosphate complexes and zinc as a simple ion (see Section 6.1.2). Examples are given in Table 6.6. 

This sensitivity to water has practical implications. A cement liquid is stable in an atmosphere of 70 % relative humidity. It will gain water in more humid atmospheres and lose it to drier ones, and this will adversely affect cement properties (Paffenbarger, Schoonover Souder, 1938 Worner Docking, 1958 Wilson et al., 1970a). 

A deficiency of water in the cement liquid has the same effect and this occurs when the H3PO4 content exceeds 60%. Wilson Mesley (1968) noted that in a cement formed from a solution of 65 % H3PO4 there was evidence of incomplete reaction even after 6 hours. We have noted in Section 6.5.3 that there is a sharp decline in the rate of reaction when the orthophosphoric acid concentration exceeds 65% H3PO4 (Figure 6.14). The avidity of cements to absorb water from humid surroundings also increases sharply when the phosphoric acid in the cement-forming liquid exceeds 60%. It is difficult to avoid the conclusion that these two phenomena are related and that a deficiency of water retards the cementforming reaction. 

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

The chemistry of polyelectrolyte cement liquids has been studied using NMR. Watts (1979) used this technique to distinguish between the homopolymer of acrylic acid and its copolymer with itaconic acid in various commercial polyelectrolyte dental cements. This was readily achieved because of the ability of NMR to differentiate between carbon atoms in chemical environments that are only slightly different. 

Pitch, roofing—mfpm Roof cement asphalt, fibrous, and plastics—mfpm Roof coatings and cements liquid and plastics—mfpm Roofing felts, cements, and... 

Adhesives, containing a flammable liquid, 3, 3.1, 3.2, 3.3 mable liquid, 3 Cement, flammable Cement, liquid ... 

Hydroquinone Chemical inhibitor added to the bone cement liquid monomer to prevent accidental polymerization during storage. 

No. 18, Sept.2002, p.3787-97 RELEASE OF GENTAMICIN SULPHATE FROM A MODIFIED COMMERCIAL BONE CEMENT. EFFECT OF H YDROXYETHYL METHACRYLATE COMONOMER AND POLYVINYLPYRROLIDONE ADDITIVE ON RELEASE MECHANISM AND KINETICS Frutos P Diez-Pena E Frutos G Barrales-Rienda J M CSIC Madrid,Universidad Complutense The influence of hydroxyethyl methacrylate monomer addition to a PMMA bone cement liquid component and of a polyvinyl pyrrolidone to the solid component on the release of gentamicin sulphate is discussed. The possibility of calculating the desired released amount and composition of devices to achieve very defined drug release profiles were investigated. 42 refs. 

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