Abstract
THE treatment of defects of the cranial bones is a problem as old as cranial surgery. All types of material have been used, and the search for a completely satisfactory substance continues. The war has stimulated such endeavor, and there is no doubt that vast strides have been made. There has been a strong tendency toward the use of metal. Almost all metals have been tried in one form or another, each having its advocates and showing advantages over the others, but each possessing distinct disadvantages. Formerly, the most successful and most popular materials were silver and vitallium,1 but other . . .

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