[Sialic acid level in blood platelets after cryopreservation with DMSO].

Plasma platelet concentrates of man were subjected to preparatory procedures with dimethylsulphoxide (DMSO) as a cryoprotective agent. It was demonstrated that DMSO acting directly on the platelets in concentrations used in routine preparation had no effect decreasing the level of sialic acids in the platelets. Cryopreservation of platelets in presence of DMSO caused the loss of 30% of the sialic acids from the platelets.

[Trials of remineralization of artificially produced enamel lesions].

The purpose of the study was checking in vitro whether after application of calcifying preparations remineralization occurs of artificially damaged enamel prisms. The study was carried out on 32 enamel samples obtained from 8 human teeth. For remineralization saturated solutions were used of phosphate-calcium compounds in the form of fluid or gel.

The influence of CS-3000 plateletapheresis on blood donors and on platelet concentrates.

Platelet concentrates were prepared from blood of donors by means of Fenwal CS-3000, or by double centrifugation method. Platelets from CS-3000 were cryopreserved with 5% DMSO for 2-4 weeks. After thawing and washing platelets were stored in room temperature for 6 hours.

[Study of the initial enamel injuries in vitro].

The purpose of the study was production under laboratory conditions of enamel changes corresponding to early caries. The study was carried out on 20 healthy human teeth in vitro, in two phases differing in the conditions of the experiment. Carietic changes were produced with lactate buffer (in concentrations from 0.

[Demineralization and remineralization of enamel in the light of the most recent literature reports].

In the light of a review of the most recent literature reports the present views on demineralization and remineralization of enamel in vivo and in vitro are presented. Modes and conditions of the development of artificial enamel damage of the character of incipient caries are discussed. The possibility in stressed of cure of initial enamel damage after application of calcification-inducing solutions and human saliva.