Abstract: Dental die models may be mounted in dental stone by filling a flexible tray having sides with uncured, fluid dental stone, and inserting the outer ends of dowel pins of the die models into the stone, while it still is in fluid condition. If more than one die model is inserted into the stone in the tray, the stone may be divided by inserting stiff divider partitions before curing. After curing, the stone is removed by flexing the tray, after which the stone may be broken along the divider partitions into separate pieces, and ground to a shape to fit in an articulator, or the like. Colored indicating members may be used to indicate the location of the outer ends of the dowel pins for grinding. Permanently emplaced portions of the die model may carry dowel pins having heads on their outer ends.

Abstract: A drill guide attachment for dental drill handpieces and the like includes a first sleeve, and attachment means adjacent one end of the first sleeve for securing it to a dental drill positioned therein. A second sleeve is in telescoping, coaxial, sliding relation with the first sleeve and positioned adjacent the other end of the first sleeve, the sleeves being adapted for bidirectional, limited axial motion relative to each other. The second sleeve has an outer end defining a flat surface occupying a plane transverse to the major axis of the second sleeve, so that positioning of the flat surface against a work piece simultaneously positions the drill in the sleeves in a predetermined manner relative to the workpiece. The second sleeve can define aperture means for viewing the contact point between a drill positioned in the sleeves and a work piece during the drilling operation.