JPS63279836A - Preparation of artificial tooth - Google Patents

Abstract

PURPOSE:To enhance the processing accuracy of an artificial tooth, by injecting a molding material in the hole part of a tooth to perform impression-taking and processing and forming a base bottom hole to an artificial tooth matrix material at the part corresponding to the base bottom part of the tooth on the basis of the signal obtained by measuring a dimensional shape from the obtained mold and fixing a holder to the base bottom hole to process and mold an outer shape. CONSTITUTION:A molding material 1 is injected in the hole part of a tooth to be repaired to perform impression-taking. On the basis of the signal formed by measuring a dimensional shape from the outer mold 2 thus obtained, a base bottom hole 9a is at first processed and formed to an artificial tooth matrix material 9 at the part corresponding to the base bottom part of the tooth to be repaired. Subsequently, the outer shape dimension of the artificial tooth matrix material 9 is processed and molded so as to be matched with a outer mold shape 9b in such a state that a holder 10 is fixed and held to the processed base bottom hole 9a and an artificial tooth having no irregularity in a finish dimension is obtained.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for manufacturing artificial teeth.

[Prior art]

Traditionally, in order to manufacture artificial teeth using ceramics, etc., water, liquid paraffin, etc. are added and mixed to raw materials such as feldspar and alumina powder, kneaded to create a clay-like material, and this is placed in a mold and sintered. is taken.

In the sintering process, a mold must first be manufactured, the resulting mold is filled with raw materials, and press pressure molding is performed.
The molded body is pre-sintered. In addition, hot press molding is performed at a temperature of about 100 to 200°C for several tens of minutes, and then the molded body is taken out of the mold and, if necessary, pre-sintered at around 800°C in a furnace, and then heated to about 1200°C. Firing is performed at a high temperature.

〔problem〕

Powder sintering requires many steps over a long period of time, and it is extremely difficult to control the temperature and time, which can result in cracks in the product. There are drawbacks to doing so. Also, impurities such as powder are burned during sintering, and self-shrink while being gasified and released, resulting in irregularities in finished dimensions. For this reason, it is necessary to create a filling state that matches the shape of the press molding, which requires considerable skill and has the drawback of requiring frequent corrections and redoing of mold filling.

[Means for solving problems]

The present invention was proposed in order to improve the above-mentioned drawbacks. A mold material is injected into the hole of the tooth to be repaired, a mold is made, and a signal obtained by measuring the dimensions and shape from the mold is used to create an artificial tooth base material. In contrast, the method is characterized in that a base hole is first formed in a portion corresponding to the base of the repaired tooth, and then the outer shape is formed while a holder is fixed and held in the machined base hole. It is something.

〔Example〕

The present invention will be explained below with reference to an embodiment of the drawings.

FIG. 1 is an explanatory diagram of the process. First, a molding material 1 such as plaster, resin, clay, etc. is injected into the hole to be repaired in the process and a mold is made. In the DI step, the obtained outer mold 2 having a shape 9.2b is extracted, and in the C step, a molding material 3 such as gypsum, resin, or clay is injected into the base hole 2a formed at the base of the outer mold 2, and the mold is inverted. Make inner mold 4. Take out the inner mold 4 at about DI. In step F, the dimensions and shape of the molds along the three axes of XYZ are measured using a digitizer from the outer mold 2 and inner mold 4 obtained by molding.

As shown in FIG. 2, the digitizer 5 uses, for example, a laser distance measuring method to irradiate the mold 2 with a laser beam, measure the XYZ coordinates using reflected waves, and then perform smoothing processing to digitize the data. occurs. output signal to CN
In addition to the CNC device 6, the CNC device sequentially stores measurement signals in a memory 7.

The memory stores signals in ROM, RAM, etc. through processing by the CPU, and the CPU causes an error of about ±0.3 to 0.5 mm due to expansion and contraction due to material, shape, etc. during mold making. However, this error correction data is input to Teach in advance, and the CPU performs arithmetic processing to correct the signal from this data so as to memorize and output accurate data.

After measuring and memorizing the dimensions and shapes of the outer mold 2 and the inner mold 4 through the EI process as described above, in step C, the artificial tooth base material 9 is molded based on the signals.

Any material such as noble metals, non-metals, ceramics, etc. can be used as the base material, and this is set in a processing machine at about FT. For machining, machining using a milling cutter, electrical discharge machining, laser machining, grinding using a diamond tool, or other processing machines may be selected and utilized depending on the type of base material. As shown in FIG. 2, the processing is carried out by driving and controlling the processing machine 8 while reproducing the memory 7 using the CNC device 6 to perform shape processing. In step C, a base hole 9a having the dimensions and shape of the inner die 4 is formed in a portion of the base material 9 corresponding to the base of the repair tooth.

Next, in the HI stage, a holder 10 prepared in the base hole 9a of the base material is fixed. It is fixed by adhesion, fitting, screwing, etc., and in step II, the holder 10 is supported by a chuck, and the base material 9. The dimensions and shape of the outer mold 2 are processed. This processing is also carried out by driving and controlling the processing machine 8 while reproducing the memory of the outer mold 2 by the CNC device 6, as shown in FIG. Through this processing, the base material 9 is processed and formed into the outer shape 9b. Finally, in step J, the holder 10 is separated from the processed base material to obtain a finished product. As shown in Fig. 2, when CPtJ has a teaching function for data correction and molding is performed using corrected data, ±0.05
It can be processed with a processing accuracy of about mm.

An artificial tooth for repair can be manufactured in the above manner, but by removing the step C for making the inner mold 4, and using the outer mold 2 obtained in the DI step, the inner and outer dimensions and shape of the mold as shown in FIG. 2 in the EI step. can also be measured. In addition, the measurement signal can be processed by directly driving and controlling the processing machine without storing it in memory.
A machine control device can be used. Also, the processing machine has
3D processing machine that controls 3 axes of YZ, XYZX'Y'
(7) A 5D processing machine that controls 5 axes, such as 7-rice machining, electrical discharge machining, wire cutting, and grinding, can be used as desired.

〔Effect of the invention〕

As described above, in the present invention, a mold material is injected into the hole of a tooth to be repaired, a mold is made, and a signal obtained by measuring the dimensions and shape from the obtained mold is used to first apply the same to the base material of the artificial tooth. A base hole is formed in a portion corresponding to the base of the repaired tooth, and then the outer shape is formed while a holder is fixed and held in the machined base hole.
It is possible to process and mold with high accuracy without causing large errors in finished dimensions due to self-shrinkage, etc., unlike conventional sintered products. In addition, processing and forming can be performed in an extremely short time and with high efficiency compared to the sintering method. Also, by selecting the molding method, any material can be used for the artificial tooth base material.

In addition, during processing and forming, a base hole is first formed in the base material in a portion corresponding to the base of the repaired tooth, and the outer shape is processed while the holder is firmly held in this hole. , machining operations can be performed very stably and easily.

[Brief explanation of drawings]

FIG. 1 is a process explanatory diagram of an embodiment of the present invention, and FIG. 2 is an embodiment of a control device used in the processing and forming process. A~1...Process diagram 1.3...Mold material 2...Outer mold 3...Inner Type 5... Digitizer 6... CNC 7... Memory 8... Processing machine 9... ......Artificial tooth base 9a...Base hole 9b...External shape 10...Holder patent application Kiyoshi Inoue, Representative of Inoue Japax Institute Co., Ltd.

Claims (1)

[Claims] A mold material is injected into the hole of the tooth to be repaired and a mold is made, and based on the signals obtained by measuring the dimensions and shape from the mold, a base hole is first formed in the artificial tooth base material at the part corresponding to the base of the tooth to be repaired. 1. A method for manufacturing an artificial tooth, comprising processing and forming the tooth, and then processing and forming the outer shape while a holder is fixed and held in the processed base hole.