Abstract: A dental prostheses modeling system includes a molding tray for molding the base of a quadrant or full-arch dental model cast which has a longitudinally disposed partition panel disposed generally between upper and lower surfaces of the tray that forms therewithin an upper well for receiving liquid die stone to mold the base of a dental impression model, and a lower well shaped symmetrically to the upper well for providing clearance for optional manipulating pins installable in the bases of selected die segments modeling individual dental prostheses severed from the hardened die stone base of the model. The partition panel includes peripheral flanges for supporting the base of the dental model, and an openable central portion for enabling a hardened dental model to be ejected from the tray, and for providing access for manipulating pins depending downwardly from die segments.

Abstract: A dental prostheses modeling system includes a tray having in an upper part thereof a trough for receiving a semi-liquid modeling material or casting material such as plaster of Paris or die stone, the trough having opposed vertical walls in which are formed alternating vertically disposed ribs and grooves for forming complementary shapes in sides of a casting molded in said tray, a base portion of which has in outer walls thereof alternating vertically disposed grooves and ribs, the trough having a frangible base plate which overlies an upwardly concave cavity for receiving liquid die stone after the upper casting has solidified, hardened and been removed, the base plate being broken and removed to uncover an elongated aperture joining the upper trough to the lower cavity enabling the cast to be ejected from the tray, pins fitted into selected portions of the casting base, the casting reinserted into the trough, and the tray inverted to receive liquid die stone which hardens to form a stone base matrix for i

Abstract: A dental prostheses modeling system includes a re-usable tray having in an upper part thereof a trough for receiving a semi-liquid casting material such as plaster of Paris or die stone, the trough having opposed vertical walls in which are formed alternating vertically disposed ribs and grooves for molding complementary shaped grooves and ribs in opposed sides of the base of a dental model casting molded in said tray. The trough has a base frame which overlies an upwardly concave lower cavity for receiving liquid die stone after the casting base has solidified, hardened and been removed. The base frame has therethrough an elongated aperture joining the upper trough to the lower cavity. A resilient insert is removably lodged in the base frame aperture to form therewith a liquid-tight seal, whereupon liquid die stone is poured into the upper trough to form the base of a dental model casting. After the casting has hardened, the insert is removed, and pins are fitted into selected portions of the cast base.

Abstract: A dental prostheses modeling system includes a molding tray for molding the base of a quadrant or full-arch dental model cast which has a longitudinally disposed partition panel disposed generally between upper and lower surfaces of the tray that forms therewithin an upper well for receiving liquid die stone to mold the base of a dental impression model, and a lower well shaped symmetrically to the upper well for providing clearance for optional manipulating pins installable in the bases of selected die segments modeling individual dental prostheses severed from the hardened die stone base of the model. The partition panel includes peripheral flanges for supporting the base of the dental model, and an openable central portion for enabling a hardened dental model to be ejected from the tray, and for providing access for manipulating pins depending downwardly from die segments.

Abstract: A dental prostheses modeling system includes a tray having in an upper part thereof a trough for receiving a semi-liquid modeling material or casting material such as plaster of Paris or die stone, the trough having opposed vertical walls in which are formed alternating vertically disposed ribs and grooves for forming complementary shapes in sides of a casting molded in said tray, a base portion of which has in outer walls thereof alternating vertically disposed grooves and ribs, the trough having a frangible base plate which overlies an upwardly concave cavity for receiving liquid die stone after the upper casting has solidified, hardened and been removed, the base plate being broken and removed to uncover an elongated aperture joining the upper trough to the lower cavity enabling the cast to be ejected from the tray, pins fitted into selected portions of the casting base, the casting reinserted into the trough, and the tray inverted to receive liquid die stone which hardens to form a stone base matrix for i

Abstract: A dental prostheses modeling system includes a re-usable tray having in an upper part thereof a trough for receiving a semi-liquid casting material such as plaster of Paris or die stone, the trough having opposed vertical walls in which are formed alternating vertically disposed ribs and grooves for molding complementary shaped grooves and ribs in opposed sides of the base of a dental model casting molded in said tray. The trough has a base frame which overlies an upwardly concave lower cavity for receiving liquid die stone after the casting base has solidified, hardened and been removed. The base frame has therethrough an elongated aperture joining the upper trough to the lower cavity. A resilient insert is removably lodged in the base frame aperture to form therewith a liquid-tight seal, whereupon liquid die stone is poured into the upper trough to form the base of a dental model casting. After the casting has hardened, the insert is removed, and pins are fitted into selected portions of the cast base.

Abstract: A hand-held dispenser for delivering small, precisely controllable amounts of fluid or semi-fluid adhesives includes an elongated container having a hollow cylindrical barrel section terminated at the rear end thereof by a pair of diametrically opposed flange wings protruding radially outwards from opposite sides of the barrel, a reduced diameter front tubular outlet section extending forward from the barrel, and a flexible capillary delivery tube protruding outwards from the outlet section. A piston longitudinally slidably located within the bore of the barrel displaces adhesive within the bore forward of the piston by the turning of a lead screw which contacts the rear wall of the piston and which is threadably held within a support member attached to the rear portion of the barrel section.

Abstract: An improved method and apparatus for making cast dental models having integral dowel pins permitting segments or dies of a model to be attached and re-attached to a base plate in a precise location, by means of holes in the base plate adapted to insertably receive the dowel pins, is disclosed. The apparatus includes a base plate having a generally semi-circular shape, the arcuate outer wall surface of which is modified to have flat walls approximating the shape of a circumscribed polygon. A matrix positioning plate has a polygonal aperture through its thickness dimension adapted to insertably receive the base plate. A negative dental impression is attached to a first, lower surface of the matrix plate, and a transparent transfer plate of the same size and shape as the base plate inserted into the aperture of the matrix plate. Marks are placed at those locations of the transfer plate where dowel pins are desired to engage parts of the dental impression viewed through the transfer plate.

Abstract: This invention provides an orthodontic appliance of generally U-shaped configuration conforming to the natural arch of the patient, having a flexible outer portion adapted to overlie portions of the facial surfaces on the teeth of a row of teeth, an inner portion of greater rigidity than the outer portion for engaging portions of the lingual surfaces of a row of teeth and overlying the gingiva, and interconnecting portions at the ends of the appliance that fit around the posterior teeth of a row of teeth, with the crowns of the teeth extending upwardly through the opening and unobstructed by the appliance. The surfaces of the inner and outer portions are made to accomplish various tooth movements or tooth retention as desired by appropriately engaging the surfaces of the teeth. Greater degrees of movement may be accomplished by splitting the inner and outer portions and providing resilient members that urge the split segments of the outer portion together and the split segments of the inner portion apart.