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. A total of 71% of the cases showed a complete filling of the fissure pattern by the sealing matter. All types of V- and U-fissures were totally filled up. With the Y1-type there is a total filling up in 60.7-88.1% of the cases, with the Y1 type in 23.6-57.6% of the cases to be expected. The penetration capacity of the sealer is in a certain correlation to the width of the fissure entrance and the fissure depth.
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