[Demonstration of a full crown with a diffusion chamber in the cat, for studies of dental pulp]

A step-by-step technique leading to the preparation of a full-crown with diffusion chamber in the cat, is presented. The crown is built according to the routine clinical technique. The diffusion chamber is prepared and sealed with the help of a specially adapted screw. A vital stain locked in the diffusion chamber did not show any leakage in the oral cavity, even after 3 months. Such a device could easily help to study the action of toxins and isolated antigens on the animals dental pulp.