Abstract: To improve operativity, a pushing device for a tooth restoration material mixed and kneaded in a capsule comprises a compression coil spring 4 provided between a leak preventive cover 2 contacted with a capsule and having a cylindrical piston rod 1 inserted, and a ratchet body 3 having a rack part 3cb and fixed to the piston rod 1; a housing body 5 having a supporting path 5b inserted in the leak preventive cover 2 and a guiding path 5c provided with the ratchet body 3 movably; a ratchet body locking plate spring 6 for preventing move of the ratchet body 3; a lever 7 for moving the rack part 3cb and returning the lever body 7a to an initial position; a release body 8 for canceling the locking to the rack part 3cb; and a stopper means 9 for stopping the ratchet body 3 at the initial position.

Abstract: To restrict bone absorption occurring as time elapses after osseous integration, a dental implant comprises an internal thread 1a; an external thread 1b having a largest crest diameter of a complete thread at the most intra-oral side; and a collar portion 1c provided on the intra-oral side of the external thread 1c to have diameters that expand from a portion including a root diameter of the complete thread of the external thread 1b at the most intra-oral side to a bellied portion having an approximately equal diameter to the crest diameter of the complete thread of the external thread at the most intra-oral side, and thereafter reduce to an intra-oral side of the collar 1c having an approximately equal diameter to the root diameter, wherein surfaces of the external thread 1b and side surfaces of the collar 1c are subjected to a surface roughening treatment.

Abstract: To provide a production method of three-dimensional shape data of a part other than an engaging portion by a three-dimensional measuring device, the engaging portion has an engaging part in a cross sectional shape other than a rotary body and is projected and/or recessed on a jawbone side, a measured object mounting tool 2 comprises a cylindrical part 2a, a mounting part 2b and a placing part 2c, the mounting part 2b positions a prolonged line of an axis of the cylindrical part 2a in the engaging part 3aa, the placing part 2c aligns a pre-specified direction of the mounting part 2b with a specified providing direction of the placing table 1b, the center axis of the cylindrical part 2a is aligned with Z axis, and the model of the dental prosthesis 3 is rotated around Z axis on the basis of the specified providing direction of the placing table 1b.

Abstract: To mix powder and liquid components evenly, a kneader comprises a rotating plate rotated around a driving axis; a bearing for a capsule housing body mounted near a circumference part of the plate, wherein an axis supported with the bearing is rotatable only in a reverse direction to a rotating direction of the plate; a capsule housing body fixed at a capsule housing body supporting axis in parallel to the driving axis and supported with the bearing; a balance weight fixed at a predetermined position of the plate approximately opposite to the body beyond the driving axis; and a mechanism for circularly moving an axis for keeping the direction of the body in the same direction as the rotating direction of the plate along a circle having the same diameter as but the different center from those of the body supporting axis.

Abstract: A composition for moistening an oral cavity is provided that has a small effusion amount of moisture contained in the composition, is hard to absorb moisture on an oral mucosa, and capable of continuously supplying moisture stably to an oral mucosa surface, the composition for moistening an oral cavity containing 2-10% by weight of glycerin, 25-60% by weight of polyglycerin, 20-60% by weight of water, and 0.1-15% by weight of at least one water soluble polymer as a thickening agent selected from the group consisting of sodium alginate, gum arabic, agar, traganth gum, carrageenan and xanthan gum.

Abstract: To give high mechanical strength, particularly compression strength, and excellent operationality in a two-paste system, a dental paste glass ionomer cement composition comprises a first paste comprising an ?-? unsaturated carboxylic acid polymer, a filler that is not reacted with the ?-? unsaturated carboxylic acid polymer and is not in a monodisperse state in water, a silica aqueous sol containing colloidal silica having an average particle diameter of 1 to 100 nm dispersed in a monodisperse state in water to an SiO2 concentration of 1 to 50% by weight, and water, in prescribed amounts respectively, and a second paste containing fluoroalumino silicate glass powder in a prescribed amount, where the second paste sometimes contains a thickening agent comprising a water soluble polymer material and water, or a polymerizable monomer having no acid group.

Abstract: To separate a catalyst for polymerizing a monomer contained in a liquid or paste dental composition containing at least a monomer, such as a dental resin cement, an autopolymerizing dental resin or a resin-reinforced dental glass ionomer cement, from the liquid or paste dental composition to thereby improve storage stability of the dental composition and reduce number of division of the dental composition, an extrusion nozzle for a dental composition mounted on one end of an extruder for extruding a liquid or paste dental composition containing at least a monomer, the extrusion nozzle contains a catalyst for polymerizing the monomer contained in the dental composition during extrusion, and the catalyst is attached to an inner wall of an extruding channel of the extrusion nozzle.

Abstract: A stirring mixer for a dental impression material to decrease bubbles to be generated in a mixed dental impression material and the material to be left in a tubular main body, the mixer has a tubular main body wherein a discharging portion is provided following the mixing portion via a throttling portion from an injecting portion to which two pastes are injected, and a stirring rod with protruding stirring blades is rotated by a motor, leading ends of 1st blades are positioned in a largest diameter portion of the throttling portion, leading ends of 2nd, 3rd and 4th blades are positioned in an inner diameter portion of the mixing portion, 1st blade in a rotational direction and interval between 3rd and 4th blades is wider than that between the other adjacent blades, and opposing faces of 3rd and 4th blade to each other bulge towards the other blades.

Abstract: A dental implant for a magnetic attachment comprising a fixture (1) having a cylindrical guide part (1b) larger than outer diameter of an internal thread (1a) and plural engagement recessions (1c); an abutment (2) having a supporting surface (2c), a recessed part (2d) on a center of the supporting surface, and a contact surface (2e) to be contacted with the fixture (1) and having a cylindrical part (2f) protruding to be inserted into the guide part (1b) and a through hole having plural engagement protrusions to be engaged with the engagement recessions (1c); and a keeper with screw (3) having a flange part (3a) to be contacted with the supporting surface (2c) a cylindrical part (3b) to be inserted into the recessed part (2d) and an external thread (3d) to be screwed into the internal thread (1a) with the keeper being fitly inserted into the through hole of the abutment.

Abstract: In a pretreatment instrument and a pretreatment method of saliva, used for identification and quantitation of Streptococcus mutans in saliva by the immunochromatographic method utilizing an antigen-antibody reaction, the instrument includes a swab and a mixing container for saliva and a treatment liquid, the swab having a stick and a soft synthetic resin-made sponge capable of absorbing a predetermined amount or more of saliva, and the mixing container being made of a transparent or translucent soft synthetic resin and comprising a bag-like portion formed integrally with and continuously to a constricted portion as the end of a tapering introduction portion having an opening thoroughly larger than the sponge, wherein the constricted portion and the bag-like portion have elasticity such that the sponge can be squashed by a finger pressure in a state that the sponge is inserted therein; the constricted portion has a width such that a pressure can be applied by fingers and has a shape such that when the sponge i

Abstract: To provide a simple examination method of buffer capacity of saliva without influence by examiner's subjectivity and an examination instrument to carry out suitably the examination method, an examination instrument, in which two to ten kinds of chemical liquids each containing a pH indicator having a transition interval within a pH range of 3.0 to 7.0 and capable of easily discriminating its indicated color at two or more stages and an acid in an amount so as to exhibit a different pH value within a pH range of 1.5 or more but lower than 3.0 when water in the same amount as that of saliva to be examined is added at a temperature of 25° C.

Abstract: For the purpose to preserve hydrogen peroxide stably for a long period of time, have excellent adhesion with keeping viscosity at about same level as that of the conventional material, give few damages to a tooth by pH, and have high efficiency of bleaching to tooth, a pasty dental bleaching material comprises 10-50 wt. % powdery hydrogen peroxide polyvinyl pyrrolidone complex blended in a liquid component, or comprises pasty first and second components, 10-50 wt. % powdery hydrogen peroxide polyvinyl pyrrolidone complex being blended in a liquid component in the first component and 0.01-10 wt. % catalyst for activating hydrogen peroxide and 1-70 wt. % thickener being blended in a liquid component in the second component.

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: A method for bleaching teeth comprises steps of applying a solution containing nitrogen-deeped titanium oxide powder on a surface of teeth, and irradiating the applied part with light to bleach the teeth based on a photocatalytic action thus produced, and a bleaching agent for teeth suitable for carrying out the method comprises a solution containing nitrogen deeped titanium oxide powder, in which the nitrogen-deeped titanium oxide is preferably a photocatalytic substance having a Ti—O—N structure having a titanium oxide crystalline lattice containing nitrogen and exhibiting a photocatalytic action in a visible light region, the bleaching agent contains preferably 0.01 to 5% by weight of the nitrogen-deeped titanium oxide powder, the nitrogen-deeped titanium oxide powder has a specific surface area of from 10 to 500 m2/g, the solution contains water and/or an alcohol as a solvent, and the bleaching agent further contains preferably 0.

Abstract: To enhance strength while keeping characteristics of conventional one such as excellent setting characteristics, high hardness of a set material, and high machinability, an impression material composition for recording occlusion comprises (A) 100 weight parts of organopolysiloxane having at least two aliphatic unsaturated groups in one molecule and viscosity of 50 to 600 mPa·s at 25° C.; (B) 0.1-30 weight parts of organohydrogenpolysiloxane having at least two HSiR2O1/2 units in one molecule and/or organohydrogenpolysiloxane having an HSiR2O1/2 unit and an SiO1/2 unit; (C) 0.1-20 weight parts of silicone resin having a specific molecular weight in which the repeating units comprise R13SiO1/2 and SiO1/2, and a mol ratio of R1SiO1/2 unit to SiO1/2 unit is 0.4 to 2.0, (D) a silicone-soluble platinum compound in an amount of 10-500 ppm; and-(E) 20-500 weight parts of inorganic filler.

Abstract: To prevent complication caused by leakage of bone cement injected into the vertebral body, organism damage caused by the leakage of the monomer or a non-cured component from bone cement and decrease of strength caused by insufficient curing of bone cement, in the percutaneous kyphoplasty, a leakage prevention bag for injecting and filling a bone cement is used, wherein the bad is made of a bioabsorbable material having a molecular weight of 5,000 to 500,000 and has a bag having the thickness of 10 to 800 ?m, an injection tube is attached to an injection port for injecting the bone cement of the bag, the bag is inserted into a cavity formed in the vertebra body, and the bone cement is injected and filled into the bag through the tube.

Abstract: A pasty dental alginate impression material composition having features that fluidity of a mixture is changeable by changing mixing ratio of both pastes, sufficient working time can be kept, and liquid separation in abase material paste does not occur during storage, comprises the base material paste composed mainly of 1-20 wt. % alginate and water, and a setting material paste composed mainly of 10-60 wt. % calcium sulfate and a liquid component unreactive with the calcium sulfate, wherein the base material paste does not contain a filler substantially, but contains 0.01-5 wt. % carbonate of sodium or potassium as a retarder and 0.01-15 wt. % one or more polysaccharides such as carrageenan, pullulan, curdlan, xanthan gum, pectin, konjak glucomannan, and locust bean gum, and the setting material paste contain 0.01-10 wt. % phosphate of sodium or potassium as a retarder, and 0.5-30 wt. % polybutene.

Abstract: A new dental plaque collecting tool comprising a handle part 1, a neck part 2, which has an upper edge with a curved face 2a comprising has a portion positioned on the lower side of an upper edge extending line of a handle part 1, and a continuing portion positioned on the upper side thereof, and a lower edge positioned on the upper side of a lower edge extending line of the handle part 1 and formed with a taper in width and a dental plaque collecting part 3 comprising an upper extending plane 3a having a width of 0.2 to 0.7 mm and an area of 2 to 10 mm2 with an angle ?a of 90 to 115 degrees with respect to the handle part 1 at an end of the curved face 2a, an acute tip end, a lower edge face 3b and a convex part 3c.

Abstract: A photoirradiation device in which an optical system can be miniaturized and utilization efficiency of light can be improved in a manner that includes a first lens and a second lens, which share refraction of light to convert light beams emitted from a plurality of light sources into the light beams substantially parallel to an optical axis, and a third lens focusing the light beams from the second lens on an incident surface 20A of a lightguide 20. A fiber rod which can output uniform light beams in a manner that includes a first rod having a single fiber and a second rod having a plurality of fibers.

Abstract: The present invention provides a composition for an oral cavity that contains the amino acid sequence of SEQ ID NO: 1, which is safe and effective without imparting bacterial resistance.