Abstract: A connection structure for a dental abutment is such that an embedded part of a dental base part to fit to an oral cavity side of an implant fixture embedded in a jawbone is inserted into and connected to an insertion hole of a dental cutting block part, wherein the dental cutting block part includes a first flat surface and a protrusion on an inner peripheral surface of the insertion hole, and wherein the dental base part includes, on an outer peripheral surface of the embedded part, a second flat surface that corresponds to the first flat surface.

Abstract: To remove an undercut part from three-dimensional data of the inner face, the program includes a surface model creating means to create a surface model based on three-dimensional data of a gypsum model including an abutment tooth, a cutting direction specifying means to specify a direction of a cutting bar, and a surface model creating means to create a surface model for machining by changing the three-dimensional data to have new coordinates by determining a base axis in parallel with the cutting bar in the surface model and plane moving coordinates of the cutting bar, and converting the coordinates of a point which becomes an undercut part, to be equal to the plane moving coordinates of a point having a high height from a specified face rectangular to the base axis at the opposite side of the occlusion face and a long distance from the base axis.

Abstract: To remove an undercut part from three-dimensional data of the inner face, the program includes a surface model creating means to create a surface model based on three-dimensional data of a gypsum model including an abutment tooth, a cutting direction specifying means to specify a direction of a cutting bar, and a surface model creating means to create a surface model for machining by changing the three-dimensional data to have new coordinates by determining a base axis in parallel with the cutting bar in the surface model and plane moving coordinates of the cutting bar, and converting the coordinates of a point which becomes an undercut part, to be equal to the plane moving coordinates of a point having a high height from a specified face rectangular to the base axis at the opposite side of the occlusion face and a long distance from the base axis.

Abstract: For accurately setting an abutment tooth model on a measuring apparatus and easily adjusting a position of the model, a holder includes a pillar shaped abutment tooth model holding base (1), which has a concave part at the upper side, and a holding hole provided at a center of an end face of the lower side for inserting a supporting shaft projecting at a center of a rotating part of the measuring apparatus, and can detachably hold the residual ridge side of the model with an sticky material built in the concave part, and a cylindrical body (2), which has a lower side having a slightly larger inner diameter than an outer diameter of the holding base (1) and being externally fitted to the holding base (1), a stepped part, and an upper side therefrom having a smaller inner diameter than that of the lower side thereof.

Abstract: A measuring center stores three-dimensional coordinate information of an intra-oral shape measured by impression taking as a digital signal. The measuring center sends the obtained measured data to a design center using communication apparatus. The design center reproduces the intra-oral shape on a graphic display device based on the received measuring data as a three-dimensional graphic, designs a shape of a dental prosthesis and stores it as a digital signal. The processing center transmits the received design data to a milling processor as a processing command and subjects a block material to milling processing to prepare a dental prosthesis.

Abstract: To prepare a dental prosthesis that has a shape exactly the same as in the form at the time of sound state, with superior intra-oral fitness precision, a process for preparing a dental prosthesis utilizing a CAD/CAM system includes subjecting three-dimensional coordinate information of an intra-oral shape measured by impression taking or by photographing within an oral cavity of a patient, to three-dimensional graphic display on a graphic display device and designing a dental prosthesis on the three-dimensional graphic, wherein three-dimensional coordinate information of a previously preserved intra-oral shape of a patient at the time of sound state is subjected to graphic display simultaneously on the graphic display device; the dental prosthesis of an objective tooth is designed so as to have a shape same as the shape at the time of sound state; the obtained design data of the dental prosthesis is transmitted to a milling processor as a processing command; and a block material is subjected to milling proces

Abstract: To overcome the difficulty in designing a dental prosthesis, which is the most fatal problem of the conventional art process for preparing a dental prosthesis of high precision and superior intra-oral fitness by a CAD/CAM system, a measuring center stores three-dimensional coordinate information of an intra-oral shape measured by impression taking or by photographing within an oral cavity of a patient, as a digital signal and sends the obtained measure data to a design center using communication means; the design center reproduces the intra-oral shape on a graphic display device based on the received measuring data by means of a three-dimensional graphic, designs a shape of a dental prosthesis and stores it as a digital signal, and then sends the obtained design data of the dental prosthesis to a processing center using communication means; and the processing center transmits the received design data to a milling process or as a processing command and subjects a block material to milling processing to prepare

Abstract: To prepare a dental prosthesis that has a shape exactly the same as in the form at the time of sound state, with superior intra-oral fitness precision, a process for preparing a dental prosthesis utilizing a CAD/CAM system includes subjecting three-dimensional coordinate information of an intra-oral shape measured by impression taking or by photographing within an oral cavity of a patient, to three-dimensional graphic display on a graphic display device and designing a dental prosthesis on the three-dimensional graphic, wherein three-dimensional coordinate information of a previously preserved intra-oral shape of a patient at the time of sound state is subjected to graphic display simultaneously on the graphic display device; the dental prosthesis of an objective tooth is designed so as to have a shape same as the shape at the time of sound state; the obtained design data of the dental prosthesis is transmitted to a milling processor as a processing command; and a block material is subjected to milling proces