Young Dental Manufacturing Company

Young Dental Mfg. Co.

Young Dental Manufacturing

George E Richmond

Michael J Quinn

Noel O Nuessle

George R Tomaich

Dental tool chuck

A chuck mechanism for holding rotating tools in gear driven or turbine driven medical/dental devices. The chuck includes a bur tube which releasably receives a shaft of a dental tool, a tilt plate which extends through the bur tube and which has a hole through which the tool extends, and a tilt plate pusher which is moveable axially with respect to the bur tube. The tilt plate is moveable between a first, unlocked, position in which the edges of the tilt plate hole are spaced slightly from the dental tool shaft so that the shaft may be freely moved axially relative to the tilt plate, and a second, locked, position in which the tilt plate edges contact the shaft to prevent axial and rotational movement of the shaft relative to the tilt plate. The tilt plate is preferably spring biased to its locked position, and the tilt plate pusher is preferably operated by a push button to move the tilt plate to its open position. In another embodiment, the tilt plate is positively held in its locked position by a threaded piece.

A dental prophylaxis tablet is disclosed containing abrasives and anticaries compounds. The tablet is hard enough to withstand normal storage and handling. The tablet also contains dispersing and wetting agents so that it may be readily constituted into a dental prophylaxis paste by the addition of water and may contain sweeteners and flavors. A typical tablet is approximately one gram in weight and has hardness of about 3.5 to 4.0 kilograms (Pfizer tester). A typical tablet can be hydrated in approximately 60 seconds with the addition of water to form a prophylaxis paste. A typical formulation is: feldspar 61%, Cabosil (TM) 1%, Instant ClearJel (TM) 5%, Sta R.sub.x 1500 (TM) 25%, sodium saccharin 0.5%, sodium citrate 0.5%, stannous fluoride 5%, Stearowet-C (TM) 0.5% and flavors 1%.

Dentifrice composition

A collet of somewhat flexible plastic for holding a dental tool in a dental handpiece, has an inner body which fits within a socket in the burr tube of the handpiece, and at its outer end extends outwardly into a hub and then rearwardly into a cylindrical skirt which fits between the outer surface of the bearing for the burr tube and the inner surface of a counterbore in the handpiece. Centrifugal force caused by rotation of the burr tube flares the skirt outwardly against the counterbore surface to provide a seal therebetween. In a modification the skirt slants outwardly to contact the counterbore surface when the skirt is stationary. A modified skirt tapers from its connection to the hub to the skirt end. In another modification, the collet has a bore in its inner end, with the handpiece end cap, the driven gear and the burr tube having bores aligned with the collet bore so that a burr extractor pin can extend through the bores to push the dental tool out of the collet. The extractor pin in one form has a flat head, and in another form has a looped end for insertion of a finger.

Growing community of inventors

St. Louis, MO, United States of America

George E Richmond