Abstract: A dental coupling assembly for anchoring a prosthesis in the mouth in which a holding member has a recess defined by a straight right circular cylindrical wall and a closed bottom which confronts the outer right circular cylindrical wall of a plug member whose end receivable within the recess is likewise closed so that the plug member forms a displacement body for displacing a fluid adhesive throughout the cylindrical gap between the two members and between the bottom wall of the recess and the end surface of the plug. Because the walls are cylindrical and not undercut or tapered, the parts can be machined with greater precision and ease while allowing adjustment because of the adhesive field gap. The T-shaped slots and other lateral openings need not be provided.