[Substitution of skull defects with methyl acrylate]

On the basis of the data of the literature and their own experiences the theoretical and pratical problems of cranioplasty are dealt with by the authors. The indications of the cranioplasty and the various materials employed are discussed. In the author's opinion, the metacrylate polymerizating to heat has been found the most practical. The use of the metacrylate implant, the modelling and the preparation of the implant, as well as a new method worked out by the authors are discussed. The operative technique, the results and the possible complications are dealt with. Also the authors' new method in order to prevent the infection from the nasal cavity is described.