Device for the production of a dental working model for the preparation of prosthetic works

Claim 1

Device for production of a dental working model for preparation of a prosthetic work comprising: a one-part base mould which functions as a model base; said base mould including a substantially semicircularly shaped outside wall spaced from a substantially parabolically shaped inner wall, and a rear wall connecting said inner and outside walls for closing off a rear side of said base mould; said outside, inner and rear walls providing a hollow space which is completely surrounded by said outside, inner and rear walls; said hollow space enlarging upwardly from a bottom of said base mould to a top of said base mould; said hollow space including first opening means through said base mould bottom and also including second opening means through said base mould top to provide an open elongated passageway through said base mould, said first and second opening means extending substantially along a major longitudinal length of said hollow space from one portion of said rear wall on one side of said base mould to an opposing portion of said rear wall on an opposite side of said base mold to define said open elongated passageway for permitting removal of a casted plaster model from said hollow space of said base mould; rib means disposed on facing wall surfaces of said hollow space for providing retention marks on the plaster model, said rib means including ribs extending outwardly from said outside and inner walls into said hollow space; and said outside and inner walls being of equal height with each of said ribs having a length equal to said height so that said ribs extend from within said first opening means of said base mould bottom to within said second opening means of said base mould top.