Abstract: A seat member to support a human body and having upper and lower planar surfaces spaced apart and connected by a continuous sidewall extending perpendicularly between and connected to the peripheries of said surfaces, and a plurality of similar covers respectively of different colors and/or textures are provided for selection of one to be attached to the seat member to provide a desired outer finished surface on said seat member. The covers have an upper and side panels complementary to the top surface and sidewall of the seat member to conform closely thereto and a bottom panel on said covers is formed to provide a plurality of attaching fingers to overlie the lower surface of the seat member. The fingers are attached to the lower surface of the seat member by strips of VELCRO or the like to maintain the selected cover upon the seat member.

Abstract: An operatory stool has a seat supported upon a post-like member extending upward from a caster-supported base, the seat having a short post extending upward from an edge of the seat and supports a horizontal curved arm for rotation about the axis of the post. Inter-engageable position control members are mounted respectively on the arm and upper end of the post and are operable for separation by raising the arm a short distance to disengage them, then rotate the arm about the axis of the post, and then release the arm to re-establish engagement of the position control members which are maintained in engagement by a compression spring. A one-way clutch also is mounted between the arm and post to permit rotation of the arm a limited distance in one direction only to augment the pivotal movement of the arm permitted by disengagement of the position control members.

Abstract: An armrest for a seat such as a stool having a post extending upwardly from an edge of the seat and supporting a substantially horizontal arm which is connected to the upper end of the post by a one-way clutch permitting pivotal movement of the arm in one direction around the axis of the post but preventing reverse pivotal movement of the arm and the mounting of the clutch on the post permitting limited vertical movement of the arm and clutch relative to the post to deactivate the clutch relative to the post to permit rotation of the arm relative to the post in the aforementioned reverse direction thereof.

Abstract: A safety air gap system for an exemplary high volume evacuator having a water-sealed pump to provide suction thereto and including a gray water discharge from the pump to a drain, the system including a closed housing adapted to be mounted at a higher level than the evacuator, a reservoir for fresh water in the housing terminating a predetermined distance below the top, a coaxial pair of inner and outer tubes extending upward from the bottom of the reservoir and terminating above the top of the reservoir, the lower end of the inner tube receiving municipal water for discharge at the top to the outer tube which discharges the water at the lower end to the reservoir as controlled by a float-operated valve between the upper ends of the tubes, the housing having in one sidewall an outlet port connectable to a drain at a level below the top of the reservoir to prevent accidental filling of the housing with water in the event of a malfunction of the system, and an air gap opening positioned in a sidewall of the hou

Abstract: A storage cabinet comprising a plurality of identical shell-like sections and similar complementary slidable drawers, each section comprising a molded plastic planar rectangular panel integral along three sides with similar edges of a pair of sidewalls and a rear wall to form a continuous U-shaped wall configuration and a front opening similar in area to the rear wall. In use, the sections are stacked vertically upon each other with the planar panel uppermost and the front openings facing a common front plane except the lowermost section which has the rear wall disposed in said plane to form a base member and drawers of complementary size are slidably supported in all sections except the bottom one. Connecting screws extend between the sidewalls of adjacent sections to connect all sections into a unitary cabinet.

Abstract: Dental restorative composition are provided having improved color stability. According to a preferred embodiment, such compositions comprise a blend of a major proportion of inorganic, particulate filler, and a minor proportion of a resin component comprising a binder resin, a diluent monomer and a three part photosensitizing system comprising an alpha diketone, an amine reducing agent, and a benzoin alkyl ether. The superior color stability and other properties of restorative compositions of this invention are believed to result from synergistic interactions among the components of the sensitizing system.

Abstract: A non-dusting and fast-wetting powdered impression material is prepared by coating at least a portion of the powder components of an otherwise conventional impression material with a surface coating agent prior to mixing with water.

Abstract: A capsule-like cartridge comprising a cylindrical body of uniform diameter open at one end and provided with an annular flange surrounding the open end, the other end being closed by an integral hemi-spherical end of the same radius as said body and provided with an angularly extending discharge nipple communicating with the interior of the hemi-spherical end and body. After the body is loaded with a precisely measured quantity of material, the open end is closed by a plug slidably movable along said body when one end is engaged by a plunger of no greater diameter than said plug and the opposite end being complementary in shape to the hemi-spherical end of the body, whereby the plunger is capable of discharging the entire measured amount of material in the body except the scintilla thereof lodged in the nipple.

Abstract: There is provided a device for efficient production of light in the low visible range for photo-curing materials, the device being particularly adapted for dental applications. The efficient light source comprises a tungsten halogen lamp with a concentrating reflector which reflects visible light and passes middle and far infrared wavelengths. A filter system is provided comprising a dichroic heat reflecting filter which efficiently passes light from 400 to 700 nm and reflects energy in the visible red and near infrared wavelengths back to the lamp envelope, thus enhancing lamp halogen cycle efficiency. The dichroic heat reflecting filter is followed by a dielectric filter which provides a high efficiency bandpass at the desired visible range. A highly efficient fiber optic light guide is positioned to receive the focused and filtered light and to transmit it to a reduced surface light applying tip at the end of a handpiece.

Abstract: A manually operable ejector holder for effecting discharge of a capsule-like cartridge of cylindrical shape open at one end to receive a measured charge of material and provided with an annular flange at the open end, the other end being closed but provided with an angular discharge nipple and the holder having a cylindrical body provided with an ejecting plunger operated by a handle and a cooperative pivoted lever member. The forward end of the cylindrical body is partially cutaway in a radial direction for a limited distance longitudinally to provide a hollow seat to receive the flanged end of the cartridge and the seat having an undercut groove to receive the flange of said cartridge, and the sidewalls of the seat at the upper edges having limited flexibility and spaced apart a slightly less distance than the diameter of the cartridge body to effect a limited snap-acting connection of the cartridge to the holder. Several embodiments of lever members and support mechanism therefor are provided.

Abstract: A water recycling unit and system for dental operatories for use to supply operating priming water to liquid seal type vacuum pumps and including a conduit connectable to a municipal water supply, a solenoid valve in said conduit operated by a timer to open the valve for very short intervals periodically to furnish fresh makeup water to an air-water separator mounted above the level of the pumps and provided with a discharge to drain that is regulated to maintain a constant supply of contaminated water withdrawn from a patient's mouth and a small amount of the makeup water to comprise priming water delivered to the vacuum pump by gravity flow. The only moving element in the basic system is the solenoid valve and it only passes fresh municipal water free of impurities to insure complete closing of the valve and thereby obviate possible partial opening due to impurities lodged between the valve and its seat.

Abstract: A radio-frequency electrosurgical device which includes an active electrode, a passive electrode, and a radio-frequency generator. The radio-frequency generator induces a radio-frequency potential on a primary winding of an isolation transformer. The secondary winding of the isolation transformer powers the active electrode. One end of the second winding of the isolation transformer is coupled to a return lead connected to the passive electrode and also is coupled to ground through a primary winding of a second transformer. If the passive electrode is disconnected from the return line, there can be an alternate radio-frequency current return path to ground, and a potential is developed across the primary winding of the second transformer. This potential is used to energize a relay to actuate an alarm and to disable the radio-frequency generator if the passive electrode becomes disconnected.

Abstract: A manually operable ejector holder for a loaded capsule-like cartridge of cylindrical shape open at one end and provided with an annular flange at the open end, the other end being closed but provided with an angular discharge nipple and the holder having a cylindrical body provided with an ejecting plunger operated by a pivoted lever-type handle member. The forward end of the cylindrical body being partially cutaway in a radial direction for a limited distance longitudinally to provide a hollow seat to receive the flanged end of the cartridge and the seat having an undercut groove to receive the flange of said cartridge, and the sidewalls of the seat at the upper edges being of limited flexibility and spaced apart a slightly less distance than the diameter of the cartridge body to effect a limited snap-acting connection of the cartridge to the holder.

Abstract: A mount for holding a set of artificial teeth comprising an elongated plate member having a row of recesses therein complementary to the lingual surfaces of said teeth and having adhesive in shallow indentations in the bottoms of said recesses to detachably secure the teeth therein and support them in such manner that the outer surfaces of the teeth are sloped forwardly for viewing.

Abstract: A manually-operable ejector holder for a loaded syringe-type cartridge having an annular collar on one end and a discharge tip on the other end and including an elongated barrel having a piston slidable therein and actuated by a fixed handle on one end of the barrel and a pivoted operating lever cooperable with the handle. The opposite end of the barrel has a curved transverse recess to receive a portion of the collar on the cartridge and a pivoted locking member has a corresponding curved transverse recess in opposition to and cooperable with the recess in the opposite end of said barrel to receive an opposite portion of the collar on the cartridge, and a sleeve is slidable over said locking member and along said opposite end of said barrel to detachably connect said cartridge to said holder.

Abstract: This invention pertains to a dental operatory console system including one or more fluid control valves for driving air and water to be delivered to dental handpieces supported for ready removal from a pivoted holder to provide adjustable angular positioning of the handpiece, one of such pivoted holders being adjacent each control valve and including a lockout for the valve plunger when the handpiece is removed from the holder, such as when changing burs, to prevent accidental operation of the air and water valve for delivery to the handpiece. The pivoted holder is readily removable for servicing the valve and the fluid circuit for water and air between a source of the same and a plurality of handpieces in the console includes shuttle valves to permit the use of a single air pressure gage for the system rather than a gage for each handpiece as in conventional multiple-handpiece consoles.

Abstract: Steering mechanism for a hospital type carriage such as a mobile stretcher supported by two pairs of spaced fore and aft casters respectively on opposite sides of the same and swivelled about vertical axes, said mechanism comprising a sprocket chain or the like extending around sheaves or sprocket gears connected respectively to one pair of said fore and aft casters, one of said sprocket gears being releasably connectable to the caster upon which it is mounted selectively for rotation with said caster about the swivel axis thereof or permit free swivelling of said caster, the chain being operable to cause the pair of fore and aft casters connected thereby to either travel in a straight line or respectively swivel similar amounts in opposite directions to effect turning movements efficiently, accurately and quickly. Quick disconnect also can be made by cam means foot-actuated to permit free swivelling of all casters.