[Histological studies of the different forms of tertiary dentin (dentin formed as a result of irritation) (author's transl)].

Authors dealing with the dentin tissue arrange the structurally various kinds of it into primary, secondary and tertiary dentin agreeing fully with the classification of Kuttler. Varieties of the tertiary dentin are shown. Explanation is given for the forming of tertiary dentin at the floor of the pulpchamber of molars.

[In vitro studies on a new fissure sealant (Concise Resin)].

The use of Concise resin--belonging to the Concise Enamel Bond System--is reported by the sealing of fissures of the premolars and molars under in vitro circumstances. On the basis of the gained results by polarisationmicroscopic and light microscopic examination of the marginal closure of the materials and his placement in the fissures, it looks suitable for using under in vivo circumstances too.