Abstract: A root canal filling material composition comprising a lithium salt has higher healing promoting activity than conventional root canal filling material compositions. Preferable compositions are (1) a composition further comprising a calcium hydroxide, (2) a combination composition of a paste A containing a higher fatty acid and rosin and a paste B containing magnesium oxide and a vegetable oil, and one or both of the paste A and the paste B comprise the lithium salt, and (3) a combination composition of a paste A and a paste B and hardens by mixing the paste A and the paste B, one or both of the paste A and the paste B comprise the lithium salt, one or both of the paste A and the paste B comprise a glass powder, the glass powder contains calcium oxide and silicon dioxide in a total amount of 50 to 100% by weight relative to a total amount of the glass powder, and in the glass powder, a weight ratio of the calcium oxide to the silicon dioxide (calcium oxide:silicon dioxide) is 6:4 to 3:7.

Abstract: A computer controlled electric syringe includes: a piston unit including a piston being configured to press and move a rubber plug of a cartridge by a second end to discharge a medicinal solution from a cartridge through an injection needle; a ball screw having a screw shaft and a nut portion that is screwed into the screw shaft, the screw shaft being loosely inserted into the hollow portion of the piston through the opening, the nut portion being coupled to the piston; a screw shaft supporting portion rotatably supporting the screw shaft of the ball screw; a rotation preventing portion configured to prevent the nut portion of the ball screw from being rotated; and a piston supporting portion supporting the piston to be movable in an axial direction of the screw shaft along with the nut portion by the rotation of the screw shaft.

Abstract: Object of the present invention is to provide a preparation for oral cavity that is appropriately usable as a prophylactic agent for dental caries, a therapeutic agent for dental caries at early stage, a prophylactic and/or therapeutic agent for dentinal hypersensitivity, a preparation for the lining of a dentin cavity surface, or the like, which has a superior effect of sealing the dentinal tubules, is capable of improving the acid resistance of the teeth and re-calcifying the teeth, ensures a short-time treatment with an easy operation, and has a high safety and good aesthetic properties.

Abstract: Object of the present invention is to provide a preparation for oral cavity that is appropriately usable as a prophylactic agent for dental caries, a therapeutic agent for dental caries at early stage, a prophylactic and/or therapeutic agent for dentinal hypersensitivity, a preparation for the lining of a dentin cavity surface, or the like, which has a superior effect of sealing the dentinal tubules, is capable of improving the acid resistance of the teeth and re-calcifying the teeth, ensures a short-time treatment with an easy operation, and has a high safety and good aesthetic properties.

Abstract: An electric syringe according to the invention injects a dental anesthetic by pressing a rubber plug of a cartridge filled with an anesthetic. The electric syringe includes: a push member configured to press and move the rubber plug of the cartridge; a drive motor configured to generate a drive force; a transmission mechanism part configured to transmit the drive force to the push member; and a control unit configured to control a moving of the push member by controlling the drive motor, wherein the control unit controls the drive motor to move the push member to gradually increase an injection speed of the anesthetic in the beginning of the injection and to move the push member to inject the anesthetic in a constant injection speed after a predetermined time has elapsed.

Abstract: An electric syringe according to the invention injects a dental anesthetic by pressing a rubber plug of a cartridge filled with an anesthetic. The electric syringe includes: a push member configured to press and move the rubber plug of the cartridge; a drive motor configured to generate a drive force; a transmission mechanism part configured to transmit the drive force to the push member; and a control unit configured to control a moving of the push member by controlling the drive motor, wherein the control unit controls the drive motor to move the push member to gradually increase an injection speed of the anesthetic in the beginning of the injection and to move the push member to inject the anesthetic in a constant injection speed after a predetermined time has elapsed.