Summary: The adjustment of diastema and tréma in complete set of dentition is not easy and requires an interdisciplinary approach. Conspicuous gaps at visible part of dentition represent a distractive or worrisome aesthetic handicap with negative influence on the individuaFs psyche and frequently also on the function of dentition. The presumption of the treatment success is the occlusion or substantial diminution of the tréma with improved aesthetic appearance and removal of gnatologic interferences. In the čase report the authors present good experience with the occlusion of tréma at the adult age by orthodontic therapy, fixed apparatus and Delair mask with subsequent prosthetic solution. Emphasis is placed on a stable result, biological approach with minimal invasive procedures. The requirement and idea of the patient belong to basic principles of therapeutic pian.

        Key words: diastema - trema - orthodontic prosthetic treatment - Delair apparatus