1,190,838. Dental impression materials. C. M. W. LABORATORIES Ltd. 12 Nov., 1968 [14 Nov., 1967], No. 51878/67. Heading C3U. A composition in tablet form for use as a dental impression material by mixing with water comprises a soluble alginate and a salt which will react therewith in aqueous medium to produce an insoluble alginate. To use the composition, a tablet as above and water may be introduced into a tubular capsule which is then agitated, and the resulting composition is then forced out of the capsule by means of a piston. In the examples, conventional tableting procedures are used on compositions comprising sodium alginate, and (1) sodium phosphate and calcium sulphate; (2) ammonium citrate, china clay and calcium sulphate, and (3) diatomaceous earth, lead silicate and tetrasodium pyrophosphate.
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