Abstract: There is provided a method for manufacturing a one-piece dental implant having a ceramic abutment and a titanium or titanium alloy implant fixture firmly adhesively fixed to each other. A one-piece dental implant having an abutment 2 and an implant fixture 1 integrated to each other is manufactured by cooling the implant fixture 1 to room temperature after a projecting part 2a of the abutment 2 at room temperature is press-fitted into a recess part 1a of the implant fixture 1 being in a state where the implant fixture 1 is heated to 100-300° C. The implant fixture 1 formed of titanium or a titanium alloy is perforated to have a truncated circular cone-shaped recess part 1a. The recess part 1a has a taper that is tapered from an intraoral side to a jawbone side. The abutment 2 formed of ceramic has a prosthetic fixing part 2b provided on an opposite side of the jawbone side and a truncated circular cone-shaped projecting part 2a provided on the jawbone side.

Abstract: For proper fitness of a core portion of an abutment to a patient, a wax model base for an abutment of a dental implant includes an engagement portion 1 engaging with an implant fixture analog embedded in a gypsum model without rotation, a truncated conical portion 2, a building portion 4 provided directly on an inner peripheral edge of a ring-like first stepped portion 3, which is provided on an oral cavity inner side of the truncated conical portion 2, or through a cylindrical portion 4a having a low height to have a conical shape expanding toward the oral cavity inner side and have a cutoff portion 5 on an outer peripheral surface, a cylindrical portion 7 provided on an inner peripheral edge of a ring-like second stepped portion 6 provided on the building portion 4, and a screw hole 8 along a center axis of the base.

Abstract: For proper fitness of a core portion of an abutment to a patient, a wax model base for an abutment of a dental implant includes an engagement portion 1 engaging with an implant fixture analog embedded in a gypsum model without rotation, a truncated conical portion 2, a building portion 4 provided directly on an inner peripheral edge of a ring-like first stepped portion 3, which is provided on an oral cavity inner side of the truncated conical portion 2, or through a cylindrical portion 4a having a low height to have a conical shape expanding toward the oral cavity inner side and have a cutoff portion 5 on an outer peripheral surface, a cylindrical portion 7 provided on an inner peripheral edge of a ring-like second stepped portion 6 provided on the building portion 4, and a screw hole 8 along a center axis of the base.

Abstract: To prevent bacterial infection, a dental implant fixture includes a female screw portion formed from the oral cavity inner side, an embedding male screw portion 1a formed to have an equal outer diameter D on a tapering truncated conical main body, a collar portion 1c at the oral cavity inner side of the embedding male screw portion 1a, and a sealing male screw portion 1b which has one or more threads, extends from the collar portion 1c in a length of ? to ? of a length L of the embedding male screw portion 1a, and has an outer diameter starting from that equal to the outer Diameter D and being on a truncated conical face less tapering than the truncated conical main body, where the threads gradually decrease in height and disappear at the side opposite to the oral cavity inner side.

Abstract: For accurate holding, easy attachment and detachment, and sufficient rotation force, a rotary tool has a holding and transmitting part 1 to hold a hexagonal column of a rotated body and give rotation force, comprising a recessed part 2, which has an inner face having an approximately regular triangle cross sectional shape, run-off parts 2a at corners of the triangle shape, and a uniform shape in depth direction, and plate springs 3, which are fixed at a bottom of the recessed part 2 and have pawl parts 3a at tips thereof positioned at the opening side of the recessed part 2, and the pawl parts 3a can be moved into the run-off parts 2a while contacting to three side faces of the hexagonal column H and generate spring force, when the hexagonal column H is inserted into the recessed part 2.

Abstract: For accurate holding, easy attachment and detachment, and sufficient rotation force, a rotary tool has a holding and transmitting part 1 to hold a hexagonal column of a rotated body and give rotation force, comprising a recessed part 2, which has an inner face having an approximately regular triangle cross sectional shape, run-off parts 2a at corners of the triangle shape, and a uniform shape in depth direction, and plate springs 3, which are fixed at a bottom of the recessed part 2 and have pawl parts 3a at tips thereof positioned at the opening side of the recessed part 2, and the pawl parts 3a can be moved into the run-off parts 2a while contacting to three side faces of the hexagonal column H and generate spring force, when the hexagonal column H is inserted into the recessed part 2.