JPH09238959A - Making of complete denture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel method of making a complete denture which enables automatically making of a highly accurate complete denture at any time. SOLUTION: A three-dimensional coordinate data of the intraoral shapes of upper and lower jaws of a patient is obtained by a measurement using a measuring device 2 from a gypsum model 1 prepared from an intraoral impression of the upper and lower jaws sampled from the patient and the shape of a mucosal surface is shown on a graphic display device 4. Then, an artificial dentition of a proper size is selected from among artificial teeth previously registered from the length of the center line of a residual ridge assumed from the shape of the mucosal surface and then, is arranged on the residual ridge on the graphic display device 4 in such a manner that the upper and lower teeth are in an anatomically correct occlusion. Then, a complete denture base is plotted on the graphic display device 4 so that the artificial dentition can be held in place and the resulting three-dimensional coordinate data thereof is fetched and a three-dimensional coordinate data of a bed side of the artificial teeth is called into the complete denture base in a state where the artificial dentition is extracted the complete denture base. Then, a block body composing the complete denture base is cut out by a NC-controlled working machine 5 with more than two axes based on the three-dimensional coordinate data and the artificial dentition is arranged securely on the residual ridge of the complete denture base thus made.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a complete denture by which a dental prosthesis with a complete denture can be produced with high precision at any time.

[0002]

2. Description of the Related Art Conventionally, for complete dentures, plaster models of the upper and lower jaws have been made on the basis of the oral impressions of the upper and lower jaws taken from a patient, and for the investigation of occlusal condition and aesthetic inspection on the plaster model. A wax wax is created by making a wax mold, arranging artificial teeth in the wax mold to make a wax denture, and burying the wax denture in embedding plaster to replace the wax portion of the wax denture with resin and removing the wax. The resin was injected and filled into the wax portion to polymerize the resin, and then the denture and the polymerized resin were dug out and polished to produce a complete denture.

However, such a complete denture manufacturing method takes time to manufacture, the accuracy of the denture depends on the experience of the technician, the evaluation measurement does not match between the dentist and the technician, and the labor cost is high. There were drawbacks such as high cost and large dimensional deformation during resin polymerization. In addition, there is also a drawback that it takes time to attach the denture to the patient due to repeated remakes and corrections due to mistakes.

[0004]

DISCLOSURE OF THE INVENTION The present invention overcomes the above-mentioned drawbacks of the prior art, facilitates the accuracy improvement of a complete denture, and can automatically manufacture a complete denture at any time. An object is to provide a method for producing a complete denture.

[0005]

Means for Solving the Problems As a result of earnest research to solve the above problems, the present inventor has taken an oral impression of the patient's upper jaw and lower jaw, and has created the upper jaw and lower jaw based on the oral impression. 3D coordinate data of the oral shape of the patient's upper and lower jaws is measured from the plaster model using a contact type or non-contact type measuring device, and the mucosal surface shape is displayed graphically. If you display it, you can grasp the occlusal relationship of the patient on this graphic display device, and based on the length of the ridge assuming the centerline of the ridge in the mucosal surface shape displayed on this graphic display device. Select an artificial tooth row of an appropriate size from the pre-registered artificial teeth and place the artificial tooth row on the alveolar ridge on the graphic display device so that the upper and lower teeth are anatomically correctly occluded. When aligned, the upper and lower teeth are anatomically correct. When the artificial denture base is drawn on the graphic display device and the three-dimensional coordinate data of the artificial denture base is taken in so that the artificial dentition can be held at that position, the desired denture Since the shape of the floor can be designed, the artificial dentition is then removed from the denture base and the three-dimensional coordinate data of the floor side of the artificial tooth is called into the denture base, and these three-dimensional After shaving a block body constituting the complete denture base by a NC-controlled machine with three or more axes based on coordinate data to produce a complete denture base, the artificial dentition is arranged on the ridge of this complete denture base. If fixed, there is no need to make a wax denture, the dependence on the material is alleviated, and the accuracy of the manufactured denture base is good, and it is possible to significantly reduce the labor of the technician to manufacture a complete denture. Because I have determined what I can do . Then, if a pre-registered artificial tooth whose lower part (bed side) is fitted to the complete denture base is used, the artificial dentition is placed and fixed on the ridge of the manufactured complete denture base. It was also found that it is preferable because it is easy and the dimensional accuracy does not decrease.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION An example of a method for producing a complete denture according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic explanatory view showing a device group for carrying out a method for producing a complete denture according to the present invention, FIG. 2 is an explanatory view showing a state in which a mucosal surface shape of a patient's upper jaw is displayed on a graphic display device, and FIG. 3 is a graphic display. FIG. 4 is an explanatory view showing a state in which the selected artificial tooth rows are arranged on the upper and lower jaw ridges of the patient displayed on the apparatus, and FIG. 4 shows the artificial teeth used in the method for manufacturing a complete denture according to the present invention and the manufactured complete denture base. It is a perspective view showing an example of relation.

In order to carry out the method of the present invention, first, an oral impression of the patient's upper and lower jaws is obtained using a dental impression material,
The gypsum model 1 of the maxilla and mandible is created based on the impression in the oral cavity, and the occlusal relationship between the gypsum model 1 of the maxilla and mandible is obtained. As a method for obtaining the occlusal relationship between the upper jaw and the lower jaw plaster model 1, an occlusal relationship between the upper jaw and the lower jaw of the patient's oral cavity is determined by using an impression tray on which upper and lower surfaces can be fitted with a dental impression material. In the case of simultaneous acquisition in the unchanged state, the gypsum of the maxilla and mandible should be adjusted so that the reference points provided for the intraoral impression match the reference points on the plaster model 1 of the maxilla and mandible created based on the intraoral impression. It is sufficient to place the model 1, and when the oral impressions of the patient's upper and lower jaws are taken separately, further occlusal measurements are taken, and the reference points obtained by the occlusal acquisitions give the oral impressions. The upper and lower jaw plaster models 1 may be arranged so as to coincide with the reference points on the upper and lower jaw plaster models 1 created as a basis.

Next, three-dimensional coordinate data of the intraoral shape of the patient's upper and lower jaws is measured from the plaster model 1 using a contact type or non-contact type measuring device 2 as shown in FIG. This three-dimensional coordinate data is converted into a digital signal by the computer 3
It is stored in the internal memory. As a memory in the computer 3, a floppy disk set in the computer in consideration of a case where a RAM board is used, a magnetic disk or the like is used, and the three-dimensional coordinate data is held and managed. May be used.

Thereafter, the shape of the mucous membrane of the patient's upper and lower jaws is graphically displayed on the CRT screen of the computer 3 or the like 4 by the computer.
To be displayed. This display is preferably a graphic display using a wire frame or the like. The positional relationship between the upper and lower mucosal surface shapes, as described above, the occlusal relationship between the upper and lower gypsum models has been obtained in advance, so the shape measurement data of the upper mucous membrane and the shape measurement data of the lower mucous membrane are set in accordance with this occlusal relationship. It can be simultaneously displayed on the graphic display device 4.

Thus, the mucosal surface shape of the patient is displayed on the graphic display device 4 from the three-dimensional coordinate data of the oral shapes of the upper jaw and the lower jaw of the patient, and the center line A of the ridge of the chin as shown in FIG. Assuming that an artificial tooth row of an appropriate size is selected from pre-registered artificial teeth based on its length and the upper and lower teeth are anatomically correctly occluded, the figure display device 4 is placed. The artificial tooth row of the artificial tooth B is arranged on the ridge. In this way, since the artificial tooth B registered in advance is registered as a state in which the upper and lower teeth are anatomically correctly occluded, if the upper and lower jaws are arranged, the arrangement of the other jaw is inevitably arranged. The position is also determined automatically. The pre-registered artificial tooth B may be a full balance type or a lingerized type,
Furthermore, in consideration of the relationship with the facial morphology of the patient, various types of anterior teeth such as square, pointed, oval, square, pointed, pointed, and pointed circles are used. It is convenient to prepare various forms such as anatomical, semi-anatomical, and non-anatomical. When a pre-registered artificial tooth B is used whose lower part (bed side) is fitted to the complete denture base, the artificial dentition is fixedly arranged on the ridge of the manufactured complete denture base. It is preferable because the work is easy and the dimensional accuracy does not decrease.

Then, the artificial denture base of the artificial tooth B can be held at that position on the graphic display device 4 by using the keyboard, mouse or tablet of the computer 3 as shown in FIG. Draw a 3D coordinate data of the complete denture base. This drawing is preferably displayed graphically using a wire frame or the like. Then, with the artificial tooth row of the artificial tooth B removed from the complete denture base, the three-dimensional coordinate data of the lower (bed side) surface of the artificial tooth B is called up on the ridge surface of the complete denture base, The three-dimensional coordinate data of the entire denture base is stored in the memory of the computer 3 as a digital signal. This computer 3
As the internal memory, a floppy disk set in the computer 3 is used in consideration of the case where a RAM board is used, a magnetic disk or the like is used, and this three-dimensional coordinate data is held and managed. You may.

Thus, when the three-dimensional coordinate data of the entire denture base is obtained, these three-dimensional coordinate data are transmitted from the computer 3 to the NC-controlled machining machine 5 having three or more axes as machining commands. A block body of a resin material for a denture base that constitutes a denture base is cut out based on coordinate data to manufacture a denture base 6, and then an artificial dentition of the artificial tooth B is placed on a ridge of the denture base 6. By arranging and fixing them, a complete denture can be manufactured. At this time, the block body of the resin material for the denture base may be a rectangular parallelepiped shape, but if it is prepared in advance to a shape similar to the denture base 6 to be manufactured to some extent, Since the amount of shaving is small, the manufacturing time can be shortened and the waste of materials can be omitted, which is preferable.

The work of disposing and fixing the artificial tooth row of the artificial tooth B on the ridge of the complete denture base 6 is performed by the artificial tooth B of the complete denture base 6.
If the artificial tooth B is provided with an asymmetrical convex portion or concave portion so that the position and the direction of fixing and fixing the tooth are correctly set, the position and the direction of fixing and fixing the tooth are incorrect. It is not necessary and is preferable. In addition, even in commonly used artificial teeth, the shape of the lower part (floor side) is asymmetrical in many cases, so there is little risk that the position and direction for fixing and disposing the tooth will be incorrect, but as shown in FIG. It is preferable that the denture base is fitted so that it can be mounted and fixed very easily and the mounting and fixing accuracy can be guaranteed.

[0014]

As described above in detail, in the method for producing a complete denture according to the present invention, the oral impressions of the patient's upper and lower jaws are taken, and the plaster of the upper and lower jaws is created based on the oral impressions. Obtain the occlusal relationship of the model and measure the three-dimensional coordinate data of the oral shape of the patient's upper and lower jaws from the plaster model using a contact type or non-contact type measuring instrument and display the mucosal surface shape on the graphic display device Since it is possible to grasp the occlusal relationship of the patient on this graphic display device, the step of producing a wax pattern and a wax denture on a plaster model as in the conventional method for producing a complete denture is unnecessary, and the labor of a technician is reduced. Can be significantly reduced.

Further, the method for producing a complete denture according to the present invention is an artificial tooth which is pre-registered based on the length of the ridge assuming the center line of the ridge in the mucosal surface shape displayed on the graphic display device. Since an artificial dentition of an appropriate size is selected from the above, it is easy to select an artificial dentition and the upper and lower teeth are anatomically correct on the graphic display device that can grasp the occlusal relationship of the patient. Since the artificial tooth row is arranged on the alveolar ridge on the graphic display device in the occlusal state, it means that the upper and lower teeth are anatomically correctly occluded. The problem caused by the technician's proficiency in deciding where to place the artificial dentition in the wax pattern prepared as described above can be solved, the occlusal adjustment time can be greatly reduced, and the upper and lower teeth can be anatomically correctly occluded. Complete denture base is not prepared It is possible to improve the bite accuracy also overcome disadvantage.

The method for manufacturing a complete denture according to the present invention is as follows.
Plot the complete denture base on the graphic display device so that the artificial dentition can be held at that position, and take in the three-dimensional coordinate data of the complete denture base, and then remove the artificial denture from the complete denture base. The three-dimensional coordinate data of the floor side of each artificial tooth is called into the denture base, and based on these three-dimensional coordinate data, a block body constituting the denture base is carved out by a NC-controlled machine having three or more axes. Since a complete denture base is manufactured, work to bury the wax denture in the plaster for embedding to replace the wax portion of the wax denture prepared by the conventional method for producing a complete denture with resin, and to perform wax removal to remove wax There is no need for any work, such as injecting resin into the wax part to polymerize the resin or digging out the denture and the polymerized resin from the plaster for embedding, so the labor of the technician is greatly reduced. do it It is possible to produce a denture.

Further, according to the method for producing a complete denture according to the present invention, the dimensions due to expansion and contraction such as a wax pattern, an embedding gypsum, and a resin for polymerizing are produced before the production of a complete denture. Since various members related to accuracy are not used, there is an advantage that the dimensional accuracy is very high.

The manufactured complete denture was applied to plaster models of the upper and lower jaws, which were created based on the oral impressions of the upper and lower jaws taken from the patient, and various instruments were used for investigation of occlusal condition and aesthetic inspection. It can also be done using.

Further, when a pre-registered artificial tooth whose lower part (bed side) is fitted to the complete denture base is used, the artificial dentition is arranged on the ridge of the manufactured complete denture base. It is preferable because the work of fixing is easy and the dimensional accuracy does not decrease.

As described above, the value of the method for producing a complete denture according to the present invention having various advantages in contributing to the dental field is very great.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing an apparatus group for carrying out a method for producing a complete denture according to the present invention.

FIG. 2 is an explanatory diagram showing a state in which a mucosal surface shape of a patient's upper jaw is displayed on a graphic display device.

FIG. 3 is an explanatory view showing a state in which the selected artificial dentition is arranged on the upper and lower jaw ridges of the patient displayed on the graphic display device.

FIG. 4 is a perspective view showing an example of the relationship between the artificial tooth used in the method for producing a complete denture according to the present invention and the produced complete denture base.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gypsum model 2 Measuring instrument 3 Computer 4 Graphic display device 5 NC-controlled machine with three or more axes 6 Complete denture base A Center line of jaw ridge B Artificial tooth

Claims (2)

[Claims] 1. An oral impression of a patient's maxilla and mandible is taken, and an occlusal relationship between the maxillary and mandibular gypsum models created based on the intraoral impression is obtained, and a contact type or non-contact type from the gypsum model is obtained. The three-dimensional coordinate data of the oral shape of the patient's maxilla and mandible is measured using the measuring instrument of the above to display the mucosal surface shape on the graphic display device, and the center line of the maxillary ridge is assumed in the mucosal surface shape. Select an artificial tooth row of an appropriate size from the artificial teeth registered in advance based on the length, and place the upper and lower teeth on the ridge on the figure display device so that the upper and lower teeth are anatomically correctly occluded. After arranging the artificial dentition on the, the denture base is drawn on the graphic display device in a state where the artificial dentition can be held at that position, and the three-dimensional coordinate data of the denture base is taken in. The floor side of the artificial tooth with the artificial dentition removed from the complete denture base The three-dimensional coordinate data of the surface is called into the denture base, and based on these three-dimensional coordinate data, a block body constituting the denture base is carved out by a NC-controlled machine having three or more axes to produce a denture base. After that, the artificial tooth row is arranged and fixed on the ridge of the full denture base. 2. The method for producing a complete denture according to claim 1, wherein a pre-registered artificial tooth is used in which the lower portion (bottom side) is fitted to the complete denture base.