The making of identical duplicate den tures has become a matter of considerable interest to the dental profession.1'6 The demand for this service is growing among those patients who do not wish to risk exposure without their teeth for even a short period. It has been a difficult prob lem in the past to make duplicate den tures, or to copy the anterior tooth arrangement in existing dentures when constructing a new set, because a process ing mold has been required which is rigid and which is destroyed when recovering a processed denture. The layered silicone mold technic of denture processing provides a means of making two or more new sets of identi cally appearing dentures by utilizing the same processing mold, and stock teeth.7 Also, at the time an existing set of den tures is being rebased or relined, a dupli cate set may be made by fabricating a set of acrylic denture teeth and processing an extra set of dentures, doing both oper ations in the same mold that has been used for relining the original dentures. A duplicate set of dentures made by this method is an exact replica of the original. Not only is the tooth arrangement the same, but each set of dentures has an identical contour of acrylic resin around each tooth. These results are possible for two reasons: (1) the upper half of the layered silicone mold, which holds the denture teeth and forms the polished sur faces of the denture, is not destroyed or damaged by processing, and (2) the re siliency of the silicone portion of the mold permits a second set of denture teeth to be positioned in the mold spaces formerly occupied by the teeth of the first denture. The materials necessary for fabricating each duplicate denture are: (1) an extra flask, the lower half of which fits inter changeably with the upper half of the flask to be used in investing the original trial denture, (2) a duplicate of the mas ter cast, and (3) an additional set of the same mold and shade of teeth used in the original denture (Fig. 1).