Abstract: The present invention teaches a closed loop energy system including means capable of managing both cooling cycle and the fuel/oxidant gas flow in conjunction with a fuel cell. The system includes a plurality of galvanic cells, gas flow conduit means, internal fluid flow conduit means, heat exchanger means, liquid-gas separator means, and gas repressurization means.

Abstract: The present invention teaches a closed loop energy system including means capable of managing both the cooling cycle and the fuel/oxidant gas flow in conjunction with a fuel cell. The system includes a plurality of galvanic cells, gas flow conduit means, internal fluid flow conduit means, heat exchanger means, liquid-gas separator means, and gas repressurization means.

Abstract: There is provided a combination dental tool for forming a bore in a tooth stub and which can then be used for the anchoring of a dental prosthesis to the stub. The combination tool is formed having a first cutting end portion and an opposite, and second, holder end portion, to be held by a dental handpiece. The holder portion is formed adjacent a crown anchor portion and the holder portion can be removed after the bore is formed. Preferably, the crown anchor portion is formed of a softer material which can be readily formed to the desired shape for the prosthesis. The cutting portion preferably has alternating sections of larger and smaller diameter and has laterally facing cutting surfaces to form undercut portions along the bore to aid in firmer seating of the anchor post.

Abstract: This invention provides a self-powered dental hygiene device having an outer housing with three sections, a battery section at one end, an intermediate electric motor section and at the second end a transmission section with a head end section at the distal end. The head end section includes an aperture therethrough, transverse to the transmission section and designed to hold a replaceable dental tool, designed for reciprocating longitudinal motion. The casing is shaped such that the first battery section extends at an angle of between 7 and 12 degrees relative to the transmission section, and the aperture is preferably perpendicular to the axis of the transmission section. The dental tool bit held within the aperture has a hollow plenum for containing a fluid to be administered during use and a pressurizing means is secured to the tool to provide for the expression of the fluid through openings in the tool blade.