[Scanning electron microscopic study of penetrability of sealants in relation to fissure morphology of permanent premolars in humans].

In the work presented here, the morphological types of the fissure system in permanent human premolars are established, their average depth and width as well as the penetration capacity of fissure in relation to the morphological type of the fissure established (V, U, Y1, Y2). The largest average fissure depth was yielded by the Y2-configuration, the lowest by the V-type. The largest average entrance width was shown by the V-type, the lowest by the Y2-type.