Casting ring formers

A casting ring former for producing a mold for a dental prosthesis, comprising:

• a base formed with a central funnel-shaped rise upon which a form for a dental prosthesis can be disposed, and an annular wall surrounding said funnel-shaped rise;
• and
• an undulating tape assembly received in said base between said rise and said wall and forming a casting ring in which a material can be cast to provide said mold, said funnel-shaped rise having an upwardly converging frustoconical configuration terminating in a pedestal, said base further comprising a ridge defined between two upwardly converging frustoconical flanks between said rise and said wall, said wall having a frustoconical configuration, an outer one of said flanks being provided with a plurality of nipple-shaped protuberances angularly equispaced by 120.degree. from one another and said wall is formed with three pairs of bulges each pair being juxtaposed with one of said protuberances for holding said tape within said base in a cylindrical configuration.

A casting ring former for producing a mold for a dental prosthesis, comprising:

• a base formed with a central funnel-shaped rise upon which a form for a dental prosthesis can be disposed, and an annular wall surrounding said funnel-shaped rise;
• and
• an undulating tape assembly received in said base between said rise and said wall and forming a casting ring in which a material can be cast to provide said mold, said rise being provided with a pair of nipple-shaped protuberances confronting said wall and said wall is provided with a pair of bulges juxtaposed with said protuberances and engageable with said tape for holding same in a cylindrical configuration.

A casting ring former for producing a mold for a dental prosthesis, comprising:

• a base formed with a central funnel-shaped rise upon which a form for a dental prosthesis can be disposed, and an annular wall surrounding said funnel-shaped rise;
• and
• an undulating tape assembly with an undulating tape having overlapping ends received in said base between said rise and said wall and forming a casting ring in which a material can be cast to provide said mold said rise being provided along an outer flank thereof with three outwardly-projecting protuberances spaced apart by 120.degree. from one another and said wall is provided with a pair of bulges juxtaposed with each of said protuberances for holding said tape in a cylindrical configuration.