Abstract: To provide mixing elements of a Kenix type static mixer capable of decreasing fluids remaining wastefully in a casing without elongation of the casing, the mixing elements are arranged in a casing so that end parts adjacent in an axial direction are connected to cross almost orthogonally, the mixing element includes a partition wall part (1) in a thin flat plate shape for partitioning the casing into approximately equal cross sectional areas, and plural spiral blade parts (2, . . . ) having a shape of a thin plate twisted by approximately 180 degrees, and being positioned in spaces partitioned by the partition wall part (1), wherein outer peripheries of the spiral blade parts (2, . . . ) at the partition wall part (1) side are integrally contacted with the partition wall part (1), and outer peripheries of the spiral blade parts (2, . . . ) at the casing side are contacted with an inner wall of the casing.

Abstract: To provide a stopper for a cutting tool capable of getting a correct depth required in a medical treatment field, even if a few kinds of a cutting tool are available, without preparing a many cutting tools, the stopper for a cutting tool is fitted to a rotary shaft of a cutting tool having the rotary shaft, the stopper includes a locking member which has a through hole contacting to the rotary shaft of the cutting tool, a clamping member which is made of a shape memory material, provided at the inner and/or outer side of the locking member and can deform the locking member by its recovering force, and a cutout part reaching to the through hole from an outer peripheral edge thereof in the longitudinal direction of the rotary shaft.

Abstract: A dental diamond bur having grains of diamond attached to a head of the bur body with a plated metal layer containing grains of a fluorine compound that are almost uniformly dispersed and have an average diameter smaller than that of the diamond.

Abstract: To improve a dental diamond bur used in clinical dental treatments and in dental laboratories for cutting and shaving natural teeth and dental prostheses such as dental fillings, dentures and artificial teeth by making it more difficult for the cutting debris to entangle on the bur and also make the bur superior in debris removal easiness and cutting feelings, a dental diamond bur is structured such that diamond grains having an average diameter of 0.01 to 50 &mgr;m are attached to the head of the bur body by a plated metal layer containing fluorine compound grains that are almost uniformly dispersed and have an average diameter smaller than that of the diamond grains, the volume fraction of fluorine compound grains in the plated metal layer being desirably 0.1 to 60% and, when the plated metal layer is a plated nickel layer, the plated metal layer desirably further containing 0.1 to 15% by weight of a phosphorus compound.

Abstract: To provide a capsule for a dental restoration material, by which an admixture can be administered to a site of a patient to be restored in a good state without substantially containing airbubbles, immediately after admixing a dental restoration material made of two components of a powder component and a liquid component, in the capsule including a capsule main body for forming a mixing compartment accommodating a powder component therein; a liquid cup for forming a liquid component-accommodating chamber accommodating a liquid component therein, which is engaged with the capsule main body; a plunger having, in the front end thereof, a rod-like protrusion for breaking through a second aperture in the front end of the liquid cup and then breaking through the first aperture in a front end of the capsule main body, which is engaged with the liquid cup; and a nozzle fixed or set in a front end portion of the capsule main body; provided is a mechanism in which the liquid cup engaged with the capsule main body is bac

Abstract: A dental gypsum bonded investment composition comprising 100 parts by weight of a mixture comprising (a) .alpha.-hemihydrate gypsum as a binder and (b) quartz and/or cristobalite as a refractory material, and optionally, (c) one or more aggregates selected from the group consisting of metallic oxides, metallic carbides, and metallic nitrides, which can substitute a part of the refractory material, having from 0.01 to 1.0 part by weight of a poly-tetrafluoroethylene resin and optionally, from 0.001 to 0.05 part by weight of one or more anionic surfactants selected from the group consisting of alkylbenzenesulfonates and alkylsulfates mixed therewith, is disclosed. The dental gypsum bonded investment composition of the invention keeps the fine particles to have a stable performance without being removed by the pneumatic transportation at the time of production, has superior heat resistance, and can be used for casting of alloys having a high melting point such as casting alloys for metalceramic restorations.