Abstract: A multiple, metered dosage device having an elongated body provided adjacent one end with a compartment or an ampule to contain material to be dispensed, a piston movable against the material to discharge it from a nozzle, a rod-like plunger movable by a pressure device against the piston to discharge material and a combination stop and release unit movable intermediately of the ends of the body between depressed and elevated positions respectively to engage a pair of racks of teeth on the plunger and including first and second teeth respectively engageable with the racks of teeth sequentially to permit the pressure device to advance the plunger and piston in similar metered, precise or predetermined increments of feeding in discharge direction and then stop the feeding movement and maintain such stopped position until the stop and release unit next is depressed.

Abstract: A biologically compatible adhesive that is shelf stable as a single component adhesive and includes a mixture of an adhesive promoting and polymerizable monomer system having a free radical polymerizable monomer or prepolymer having ethylenic unsaturation and a phosphorus containing adhesion promoter, a free radical polymerization catalyst, and an accelerator for the catalyst, the accelerator selected from the group consisting of sulfinic acid or salt thereof, amine or amine salt and mixtures thereof.

Abstract: A new type of dental prosthetic facing and a new method of preparation of dental prosthetic facings is disclosed. The dental prosthetic facing is provided with an outer shader layer, an intermediate at least substantially uncolored, translucent layer, and an opaque substructure color keyed with the shader layer to match a shade guide. The opaque substructure may be a metal support with a surface opaquing agent in one species.The dental prosthetic facing may be prepared by removably mounting an intermediate uncolored translucent layer that is a crown on a color keyed opaque substructure that is a dental mount. The dental mount being matched to an opaque dental cement that will mount the finished shaded dental crown.

Abstract: A combination mixing and discharge capsule for storing separate ingredients which are to be mixed together prior to use and including a container body for one ingredient closed at one end by a slidable piston and the opposite end being displaceably received in a cup-shaped cap which forms a second compartment with a perforated wall of the container body opposite the end containing the piston for receiving a frangible pillow containing a liquid second ingredient to be mixed with the ingredient in the body. The cap has a discharge nozzle extending axially therefrom and when the cap is displaced farther onto the body the innermost wall of the pillow is burst to cause the discharge of the liquid ingredient through the perforated wall end into the container body for mixing with the ingredient therein.

Abstract: The present invention provides a new method of ameliorating oxygen inhibition especially with curable dental material having a polymerizable system including polymerizable organic compound, and polymerization initiator activatable by actinic radiation. The method involves shaping the dental material into a shaped member having relatively vertical surface and relatively horizontal surface, preparing a liquid composition, applying the liquid composition to the relatively vertical surface and the relatively horizontal surface to the member, forming a layer from the liquid composition, and applying actinic light to the light curable material through the layer. The method preferably involves including water and organic compound in the liquid composition and providing the layer in an amount of at least about 35 mg/dm.sup.2 on a fully dried weight basis.

Abstract: A dental articulator comprising upper and lower bows connected by vertical support members, the upper bow being pivotally connected to the support members for raising and lowering relative to a planar mounting table which is positionable between the bows and parallel to the lower bow, the mounting table having a mounting bar extending perpendicularly from one surface and the mounting table being reversible to dispose a desired surface thereof uppermost and the table also having a supporting pin detachably connected to the forward end thereof for reversible positioning to extend from either surface of the table, and the upper bow also having adjustable pivot means operable selectively to effect lateral movement of the upper bow relative to the table and lower bow when in one position of adjustment but only permit pivotal movement when in a second position.

Abstract: Disclosed is an alloy that is a combination by weight percent of 78 to 84 percent nickel, 11 to 15 percent chromium, 3 to 5 percent vanadium, and 1 to 2 percent beryllium. Any balance of other elements make up less than 7 percent with aluminum, manganese, silicon, tin, lanthanum, cerium, praseodymium, neodymium, samarium, gadolinium, molybdenum, niobium, tantalum, tungsten, titanium, iron, boron, and carbon specifically disclosed. The alloy is, in particular, a dental casting alloy or dental veneering alloy, and dental prostheses containing the alloy is a feature of the disclosure.

Abstract: A nickel base casting alloy containing 10 to 25 percent chromium, 3 to 8 percent manganese, 3 to 10 percent niobium, 0 to 3.5 percent aluminum, 0.5 to 2.0 percent beryllium which exhibits lower melting characteristics allowing enhanced compatibility to gypsum bonded investments.

Abstract: A dental impression tray and method of using it to form in a light-polymerizable impression material an impression of a portion of dental anatomy in an oral cavity, the tray being formed of transparent substantially rigid material, preferably clear plastic, and molded into a channel-like shape defined by walls capable of having visible actinic light applied to the walls of the tray for transmission along and through the walls, and substantially all the exterior surfaces of the walls having light reflecting metal foil or the equivalent applied thereto for the dual purpose of preventing unintentional light exposure to material in the tray and subsequently providing a light reflecting surface operable to reflect light into the impression material.

Abstract: This invention pertains to a method and apparatus to fabricate economical dentures for edentulous dental patients comprising attaching full arch unitary upper and lower sets of artificial teeth to denture base material and fabricated by a process developed for the purpose of utilizing these sets of teeth and converting them into finished upper and lower dentures by the use of a specialized apparatus comprising part of the invention. The process eliminates the conventional procedure of mounting individual artificial teeth in the normal process of fabricating dentures.

Abstract: This invention provides hardenable compositions useful as construction media for a wide range of applications. Particular utility is found in the dental and medical arts where such compositions are highly suitable for the formation and construction of denture base, denture baseplates, denture liners, denture repair, custom trays, veneering for crowns and bridgework, artificial teeth, veneers and repair for natural teeth, and tooth restorative fillings.

Abstract: This invention pertains to a method and apparatus to fabricate economical full arch unitary upper and lower sets of artificial teeth for use in preparing dentures for edentulous dental patients and attaching said sets of teeth to denture base material by a process developed for the purpose of utilizing these sets of teeth and converting them into finished upper and lower dentures by the use of a specialized apparatus. The process and apparatus, per se, are the subject of another related application and eliminates the conventional procedure of mounting individual artificial teeth in the normal process of fabricating dentures.

Abstract: A syringe comprises a body member detachably secured onto one end of a syringe barrel provided at its other end with a delivery tube and containing a movable piston member; a piston actuating assembly movably mounted in the body member and comprising a tube generally coaxial with the barrel and a rod movably mounted within the tube; and a pawl for moving said piston actuating assembly whereby the tube is first displaced to move the piston to the distal end of the barrel and the rod is then moved to pierce the central region of the piston member and to pass through the piston into the delivery tube.

Abstract: A dispenser for flowable material having a squeezable container formed with filling and discharge openings at opposite ends, a combination handle and closure member connectable to the filling opening, and a flexible discharge spout and second closure member being connectable selectively to the discharge opening of said container, the connections all having snap-acting co-engaging members and the discharge spout being elongated and flexible and of uniform very small diameter to control discharge of precise amounts of material directed to desired locations of use by an operator holding the dispenser pen-like in one hand.

Abstract: A centrifugal ceramic casting furnace including a horizontal arm rotatably supported by the upper end of a vertical shaft driven by a motor and the arm having a casting ring cradle on one end, a muffle movable along said arm a limited distance toward and from the cradle and a counterweight device mounted upon the opposite end of the arm adjustably both longitudinally and upwardly in a manner to balance the opposite ends of the arm statically and also adjustably dispose the effective masses of the muffle and counterweight within a common horizontal plane to effect substantial freedom from vibration while the furnace is rotating at a centrifugal casting speed.

Abstract: An optical inspection system for the inspection of circular workpieces (1) includes an electronic camera (6) having an optical system (21) for focusing an image of a circular workpiece (1) on an electronically active image receiving surface (23), means (16) to move the circular workpiece (1) into a predetermined position in the field of view of the optical system (21) of the camera (6). When a conventional electronic camera is used to inspect circular workpieces it is very difficult to analyse the output signal from the camera since it corresponds to chords taken across the workpiece (1). To overcome this the present inspection system includes means (7) for scanning the image receiving surface in directions extending substantially radially across the image receiving surface to produce an output signal, and a signal analyser (12) arranged to monitor the output signal corresponding to each radial scan to detect the presence of any irregularity in the workpiece.

Abstract: An ultrasonic endodontic file that is resistant to failure from fracturing and breaking during operation by having an ideal length, which if increased or decreased by more than 1 mm, will result in increased file breakage.

Abstract: A multi-function dental operating light source comprises a series of optical filters and flat reflectors mounted upon a turntable at spaced locations around the periphery, the turntable being rotatable about a fixed axis relative to a stationary tungsten halogen lamp having a parabolic reflector and including stationary spherical mirrors mounted to reflect light forward.

Abstract: A combination capsule adapted to both mix a plurality of ingredients to prepare them for use and then extrude the same through a nozzle attachable to one end of the capsule which comprises a pair of reciprocal sleeves respectively having compartments to contain different ingredients confined therein prior to the ingredients being brought into contact and the capusle being arranged to cause the ingredients to be brought together by pushing one sleeve into the other to rupture a membrane in the latter, whereby the ingredients may be agitated to mix them, followed by exchanging a cap on the outer end of the inner sleeve for an attachable nozzle and the outer end of the outer sleeve being closed by a closure having a flangible section adapted to be pushed into the sleeve and serve as a plunger to effect removal of the mixed ingredients through the nozzle.

Abstract: An adhesion promoter, suitable for improving the adhesion of composite dental material to tooth enamel, comprises a solution in a volatile organic solvent therefor, such as a lower alkanol, of a polyethylenically unsaturated monophosphate or salt thereof, containing a monophosphate radical and at least three ethylenically unsaturated groups (preferably terminal ethylenically unsaturated groups) per molecule. Preferred polyunsaturated phosphates are monophosphates of polyhydric alcohols containing at least four hydroxyl groups per molecule in which at least three hydroxyl groups are esterified with an ethylenically unsaturated carboxylic acid, and especially preferred polyunsaturated phosphates (which are provided as new compounds) are those of the formula: ##STR1## in which: R is an aliphatic (optionally interrupted by one or more oxygen atoms) cycloaliphatic or aryl radical having a valency of n+1 and containing from 4 to 16 carbon atoms,R.sup.1 is a hydrogen atom, alkyl C.sub.1 -C.sub.