Dental technicians tool and tool retainer

Dental technician's tool adapted for the rapid and accurate positioning of a tooth model die repetitively on a model base support, comprising an axially elongated member having an upwardly extended head portion engageable with said tooth model die, a downwardly tapered bottom portion receivable in said base support, and a downwardly diminishing intermediate portion of cusped transverse cross-section arranged to engage said base support above the member bottom against cocking or rotation of said tooth die in mounted position on said model base support, but in repetitively vertically separable relation in which said member head portion is generally cylindrical about the member axis and rises from a transverse shoulder formed on said member;

• said bottom portion being coaxial with said head portion and tapered at a first angle relative to the member axis;
• said intermediate portion being frusto-conically tapered downwardly from said transverse shoulder at a second larger angle relative to said member axis and vertically defining a plurality of circumferentially spaced surface rounded splines disposed at a third still larger angle relative to said member axis for spline differential taper regression vertically into said intermediate portion in inwardly tapered cusp-forming relation along the length of said intermediate portion, said elongated member being in combination with a dental technician's tool retainer adapted for the repetitive, rapid and accurate positioning of said tooth model die having said axially elongated member projecting fixedly therefrom on a model base support, said tool retainer comprising an apertured body having an internal wall defining a bore adapted to cooperatively seat said elongated member against cocking and rotation, said body being adapted to insertion in a model base support, and anchor means on the body periphery adapted to block relative movement of said body and said model base support in projecting member seated relation.