JPH0678937A - Forming method of flanged denture and combined tray used therefor - Google Patents

Abstract

PURPOSE:To provide flanged denture which is fifted for the jaw characteristic of an individual patient and is excellently comfortable for the patient to use by going to clinic two times in the case of a minimum and simplify and facilitate the technical working operation. CONSTITUTION:The taking of the impressions of the upper and lower jaws and the determination of the biting height are carried out simultaneously by using the upper and lower trays 1 and 3 in one set, and each shape of the taken-out impression members 2 and 4 is measured in noncontact form, and the jaw bank shape in electronic data form is obtained. The jaw bank shape in electronic data form is inputted into a computer, and further, the setting of the artificial tooth data, determination of the shape of denture flange floor, analysis of the stress generated at each position on the basis of the jaw movement data of a patient and the correction of the shape of an artificial tooth for obtaining the optimum biting state on the basis of the analysis are executed in succession on a monitor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is one of the dental care techniques. It measures the shape of the jaw ridge that differs depending on the individual patient, and uses a computer to correspond to the shape of the jaw ridge that has been measured. TECHNICAL FIELD The present invention relates to a method for producing a plate denture made of and a combination tray used for taking impressions of upper and lower jaws when performing the method.

[0002]

2. Description of the Related Art Conventional plate dentures, for example, full dentures,
Generally, it was created through the following steps. That is, the first step of examining the inside of the patient's mouth, and the second step of taking a rough impression (rough impression) of the patient's upper and lower jaws and creating a tray having a shape suitable for the patient from the rough impression. And, the third step (this mold making) to obtain a precise impression using the tray, and the upper and lower separate gypsum models suitable for individual patients are made based on the obtained precise impression, and these are made. The fourth step of producing an occlusal floor for connecting and reproducing the upper and lower occlusion, and observing the state of the jaw movement by observing the oral cavity of the patient and reproducing the jaw movement on the occlusal floor, for example, The fifth step of determining the occlusal position by three-dimensionally acquiring the occlusal state such as whether or not there is a tilt that causes a hit, and looking at the oral cavity of the patient, from among the various prepared artificial teeth Based on the sixth step of selecting one and the above plaster model, A step of preparing a floor made of stainless steel and arranging artificial teeth on this floor for trial application, and an eighth step of completing the complete denture by melting the wax and replacing it with a resin floor are sequentially performed. I was making a denture.

[0003]

In the above-described conventional method for producing a full denture, it is necessary to mold at least twice, and the occlusal state is obtained and the occlusal positioning is performed based on the occlusal state. It is necessary for the patient to load the denture prepared in the first step to the third step, the fifth step, the sixth step and the eighth step into the patient before the completion of the predetermined full denture. It requires at least 6 visits, and the dentist has the inconvenience of having to work in the patient's oral cavity each time the patient visits. Further, since it is necessary to make a plaster model, a technical operation accompanying medical treatment is required.

The present invention has been made in view of the above circumstances, and it is possible to reduce the number of patient visits required and to facilitate the work of the dentist in the oral cavity. An object of the present invention is to provide a method for producing a denture and a combination tray that can be effectively used in the method.

[0005]

In order to achieve the above object, a method for producing a plate denture according to claim 1 of the present invention is
Put the upper tray holding the impression material that takes the impression of the upper jaw and the lower tray that holds the impression material that takes the impression of the lower jaw into the patient's mouth, take the impression of the upper jaw and the lower jaw, and see the occlusion in the upper and lower trays. Fixing in the oral cavity and the shape of the impression material held in the upper and lower trays taken out of the oral cavity are obtained in a non-contact manner by a three-dimensional measuring device using light irradiation to obtain the jaw ridge shape that has been converted into electronic data. A step, a step of setting artificial tooth data showing the shapes of the upper and lower artificial teeth corresponding to the above-mentioned ridge shape on a computer, and connecting the artificial tooth shape and the ridge shape to produce the shape of the denture base. Based on the process and the process of collecting the jaw movement data which is electronic data indicating the jaw movement of the patient, and the jaw movement data, the stress acting on the artificial tooth, the floor and the jaw ridge in the jaw movement state is analyzed. Stress analysis process Based on the analysis, based on the process of modifying the shape of the artificial tooth and the shape of the obtained denture base and artificial tooth so as to obtain the optimal occlusal contact state for maintaining the stability of the denture with jaw movement. And a step of producing a plate denture.

In particular, after the stress analysis step, a stress distribution analysis step for analyzing the stress distribution in the jawbone and mucous membrane forming the alveolar ridge may be provided (Claim 2), and further after the stress distribution analysis step. , A step of calculating the morphology of the artificial tooth that transmits an appropriate functional force to the jawbone (claim 3)
It is preferable.

Further, a combination tray for preparing a denture having a floor according to claim 4 of the present invention comprises an upper tray for holding an impression material for taking an impression of an upper jaw, and a lower tray for holding an impression material for taking an impression of a lower jaw. The upper and lower trays are provided with a space adjusting member that adjusts the space between them in a superposed state.

[0008]

According to the first aspect of the present invention, by inserting the upper and lower trays into the patient's mouth, it is possible to simultaneously obtain the impressions of the upper and lower jaws and determine the occlusal position, and to change the shape of the impression material to the tertiary shape by light irradiation. Since it can be performed in a non-contact manner by the original measuring device, it is possible to mold only once, and it is also possible to eliminate the need to make a plaster model. Furthermore, by inputting the electronic ridge shape obtained by the above three-dimensional measuring device and converted into electronic data into a computer, the setting of artificial tooth data corresponding to the shape of the ridge, and the artificial tooth data and ridge data Fabrication of denture base shape by connection, artificial tooth based on collected jaw movement data, analysis of stress acting on floor and ridge, and artificial tooth for obtaining optimal occlusal state for maintaining stability of denture due to jaw movement It is possible to perform all the work such as the form modification of the above on the computer monitor. Therefore, a plate denture can be created only by forcing the patient to visit the hospital at least twice. The above-mentioned patient's jaw movement data can be collected by a method using a known optical technique.

In particular, as in claim 2, an analysis step of stress distribution in the jawbone and the mucous membrane is added after the above stress analysis step, and further, in claim 3, analysis of the stress distribution is added. By adding the step of calculating the morphology of the artificial tooth that transmits an appropriate functional force to the jawbone after the step, it is possible to create a bed denture that matches the characteristics of the jaw ridge that differ for each patient.

According to the tray of the invention of claim 4,
By inserting into the oral cavity of a patient, impressions of the upper and lower jaws and determination of the occlusal position can be performed at the same time, thereby simplifying and facilitating the technical work operation when performing the above method.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a side view showing a combination tray used for carrying out the method for producing a full denture according to the present invention, FIG. 2 is a plan view showing the combination tray of FIG. 1 in an exploded manner, and FIG. 3 is a bottom view of FIG. In the figure, reference numeral 1 denotes an upper tray made of resin, which holds an impression material 2 such as rubber for taking an impression of the upper jaw. Reference numeral 3 denotes a resin lower tray, which holds an impression material 4 such as rubber for taking an impression of the lower jaw. A space adjusting member 5 is provided between the upper tray 1 and the lower tray 3 to adjust the space between them when they are polymerized.

As shown in FIG. 4, the interval adjusting member 5 is screwed into female screw holes 3a formed at one position in the front portion of the lower tray 3 and at each of the left and right portions in the substantially central portion, so that the upper tray can be screwed. Stepped screw member 5A with the tip protruding to the 1 side
And a fixing nut 5B screwed to the upward projecting portion of these screw members 5A, and the interval between the upper and lower trays 1 and 3 is adjusted by adjusting the projecting amount of the screw members 5A.
It can be fixed.

Next, a method for producing a full denture using the combination tray having the above-mentioned structure will be described with reference to FIG.
Each step will be described with reference to the flowchart of FIG. First step (step S11): As shown in FIGS. 1 to 3, the upper and lower trays 1 and 3 holding the impression materials 2 and 4 are inserted into the oral cavity of the patient, and the upper jaw A and the lower jaw B shown in FIG. The upper and lower trays 1 and 3 are fixed in the oral cavity while observing the occlusion while taking the impression. That is, after the impression of the upper and lower jaws is taken, the bite height is adjusted by adjusting the position of the nut 5C with respect to the screw member 5A of the interval adjusting member 5 shown in FIG. As shown in FIG. 7, the upper and lower trays 1 and 3 are fixed by injecting the adhesive fixing material 6 and curing it between the parts.

Second step (step S12): The shape of the impression materials 2 and 4 held on the upper and lower trays 1 and 3 taken out from the oral cavity is measured by a three-dimensional measuring device using light irradiation such as laser light. The contactless measurement is performed to obtain the ridge shape converted into electronic data. Here, the ridge is C in FIG.
As shown in, it is formed from the jawbone and the mucous membrane. The three-dimensional measuring device used in the second step is, for example, a multiple exposure high-speed measuring device using a multi-slit laser and a CCD camera, a pattern projection type (light cutting type) measuring device that projects slit light a plurality of times, or the like. Since a conventionally known device is used, a detailed description will be omitted.

Third step (steps S13 to S1)
5): The electronic data of the alveolar ridge shape obtained in the third step is input to the computer, and the model 7 is three-dimensionally constructed on the monitor as shown in FIG. 6 and corresponds to the model 7. Then, artificial tooth data indicating the shapes of the upper and lower artificial teeth is set. That is, several artificial tooth model 8 patterns are formed on the monitor, and the optimal artificial tooth model 8 for the model 7 is selected and set. Then,
An artificial tooth shape model 8 and an alveolar ridge shape model 7 are connected to produce a denture base shape model 9. At this time, the production of the model 9 is proceeded while projecting the front, side, plane, and a large number of cross sections of the alveolar ridge model 7 and artificial tooth model 8 on the monitor.

Fourth step (step S16, step 1)
7): The electronically converted jaw movement data indicating the jaw movement of the patient is collected. For example, a light emitting diode is attached to three positions of the patient's chin, and the coordinates of the three points of the chin with respect to the skeleton are input to measure the chin's movement and convert it into electronic data to obtain jaw movement data. This jaw movement data is input to a computer, and based on the input data, the stress acting on the artificial tooth, the floor and the ridge in the movement state of the jaw is analyzed. Specifically, the distribution of stress acting on each part in the motion state of the jaw, the degree of concentration, the degree of inclination, etc. are analyzed using the two-dimensional and three-dimensional finite element methods, and stored as data. When the stress concentration is excessive, it is effective to relieve the stress concentration by changing the position of the artificial tooth or the position where the upper and lower teeth are engaged with each other according to the ridge shape of the patient.

Fifth step (step S18): The stress distribution in the jawbone and mucous membrane forming the ridge is analyzed. Specifically, the stress generated in the jawbone is predicted from the shape of the ridge and the thickness of the mucous membrane. For example, if the stress generated in the jawbone is large, the bone will gradually become thin, and the denture will be shaken (rattled) or rotated (tilted). Therefore, an analysis is performed to predict it and convert it into data. When the stress in the jawbone is excessive, it has been proved effective to suppress the deformation by increasing the rigidity of the denture and suppressing the deformation, rotation and movement of the denture as much as possible. To increase the rigidity of the denture, there are methods such as partially increasing the thickness and changing the material of the floor to one having high rigidity.

Sixth step (step S19): Based on the data obtained from the analysis result of the stress distribution in the fifth step, an artificial tooth for transmitting an appropriate functional force to the jawbone, that is, a force for chewing. Calculate the morphology.

Seventh step (step S20): The shape of the artificial tooth is modified so that an optimum occlusal contact state for maintaining the stability of the denture due to the jaw movement can be obtained based on the above analysis results. To do. Specifically, in the case of a patient whose jaw moves largely horizontally, the occlusal contact surface should be wide, and in the case of a patient whose jaw moves only up and down, the occlusal contact surface should be narrow, etc. The artificial tooth model of several patterns is input according to the motion state, and it is corrected on the monitor.

Eighth step (step S21): Based on the data of the shape of the ridge, the data of the denture base and the data of the artificial tooth obtained in the above-mentioned steps, the photo-curing property is used by using the well-known technique of stereolithography. Laser light is applied to the resin to produce a full denture consisting of a denture base and artificial teeth. Similarly, in the partial denture, the portion to be replaced with metal can be formed by photopolymerization resin, and by using this as a prototype, it is buried and cast by a usual method, or it can be produced by directly cutting out metal.

After that, if necessary, it is colored by stain, or a substance that emits light according to the wavelength of the laser is mixed in the resin, and the change of the wavelength causes, for example, only the tooth portion to develop white. It is colored by applying the color of.

The production of the denture base and the artificial tooth in the eighth step may be carried out by carving out the resin by an automatic machining method, and using an ultraviolet curable resin,
This may be irradiated with ultraviolet rays to produce a denture base and artificial teeth. Furthermore, a full denture obtained in the 8th step is used as a prototype (positive type), and a full denture base is created by casting from this, or in the 8th step, the ridge shape, the denture base and the artificial tooth data are obtained. Make a mold (negative type) on the base,
From now on, all dentures may be cast.

Regarding the coloring, after the production of the denture base and the artificial tooth, the tooth part may be shaved and filled with a white substance such as a resin which is polymerized by light, for coloring. In the eighth step, the surface layer (tooth side) and the back surface layer (jaw side) of the denture are separately manufactured with transparent resin by a stereolithography method or mechanical shaving, and these layers are stacked. It is also possible to color the denture by aligning and casting a resin having a color suitable for the patient's teeth and gingiva into the hollow portion formed between the two layers. At that time, the denture base portion is injected with a resin having a color compatible with the gingiva, and the artificial tooth portion is injected with a resin having a color compatible with the tooth. With such a hollow structure, there is also an advantage that the eighth step of producing a denture can be performed in a shorter time than the production of a solid denture.

By the way, in the method for producing a full denture including the above steps, it is necessary for the patient to visit the dental clinic because the dentures produced in the first step and the eighth step are loaded into the patient. Only twice when. In addition, since it is not necessary to make a plaster model, which was necessary for conventional molding, there is no need for a technical operation associated with medical treatment.

Further, by carrying out the fifth step and the sixth step, it is possible to produce a full denture that better matches the characteristics of the individual ridges of the patient.

Although the above-mentioned embodiments are all about the method for producing a denture, the present invention can be applied to a partial denture as it is. In the case of a partial denture, for example, when the partial denture is stereolithographically formed in the eighth step, a portion to be replaced with a metal is formed by a photopolymerization resin, and this is used as a prototype and is embedded and cast by a usual method, Alternatively, it can be created by directly carving out metal.

Furthermore, the present invention can also be applied to the production of mouth guards, occlusal elevation plates, bite planes, etc. without artificial teeth. In that case, each process of this invention is performed except the process relevant to creation of an artificial tooth.

[0028]

As described above, according to the invention of claim 1, by inserting the upper and lower trays into the oral cavity of the patient, it is possible to simultaneously obtain the impressions of the upper and lower jaws and determine the occlusal position, and at the same time, the impression material. Since the shape can be performed in a non-contact manner by a three-dimensional measuring device using light irradiation, it is only necessary to make a mold once. Also,
Since it is not necessary to make a plaster model, the technical operation associated with medical treatment is simplified. Furthermore, by inputting the electronic ridge shape obtained by the above three-dimensional measuring device and converted into electronic data into a computer, the setting of artificial tooth data corresponding to the shape of the ridge, and the artificial tooth data and ridge data Fabrication of denture base shape by connection, artificial tooth based on the acquired jaw movement data, analysis of stress generated in the floor and ridge, and artificial tooth for obtaining optimal occlusal state for maintaining stability of denture due to jaw movement Since all of the work such as the form modification can be performed on the computer monitor, the number of patient visits can be significantly reduced.

Particularly, as in claim 2, a stress distribution analyzing step in the jawbone and the mucous membrane is added to the stress analyzing step, and further, the stress distribution analyzing step is performed in claim 3. When adding the process of calculating the morphology of the artificial tooth that transmits an appropriate functional force to the jawbone following the process, be sure to create a full denture that matches the characteristics of the jaw ridge that differs for each patient, and use the denture. The feeling can be made more comfortable.

Further, according to the invention of claim 4, by inserting into the oral cavity of the patient, it is possible to simultaneously obtain the impressions of the upper and lower jaws and determine the occlusal position, and carry out the technical work in carrying out the above method. The operation can be simplified and facilitated.

[Brief description of drawings]

FIG. 1 is a side view showing a combination tray used for carrying out a method for producing a full denture according to the present invention.

FIG. 2 is a plan view showing an exploded view of the combination tray of FIG.

FIG. 3 is a bottom view of FIG.

FIG. 4 is an enlarged cross-sectional view of a main part showing a configuration of a space adjusting member between an upper jaw tray and a lower jaw tray.

FIG. 5 is a flowchart illustrating a method for creating a full denture.

FIG. 6 is a diagram showing a model of a denture base and an artificial tooth projected on a computer monitor.

FIG. 7 is a cross-sectional view of a main part for explaining a fixed state of the upper and lower trays whose occlusal height is determined.

[Explanation of symbols]

1 ... Upper jaw tray, 2, 4 ... Impression material, 3 ... Lower jaw tray, 5
... Spacing adjustment member, 5A ... Screw member, 5C ... Fixing nut, 7 ... Jaw-shaped model, 8 ... Artificial tooth model, 9 ... Denture base model.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mutsuji Muramoto 2-30 Tagawakita, Yodogawa-ku, Osaka-shi, Osaka Inside Unison Co., Ltd.

Claims (4)

[Claims] 1. An upper tray holding an impression material for taking an impression of an upper jaw and a lower tray holding an impression material for taking an impression of a lower jaw are put in the oral cavity of a patient to take an impression of the upper jaw and a lower jaw, and occlusal. The process of fixing the upper and lower trays in the oral cavity while watching, and the shape of the impression material held in the upper and lower trays taken out of the oral cavity were electronically obtained by non-contact measurement with a three-dimensional measuring device using light irradiation. The step of obtaining the ridge shape, the step of setting artificial tooth data showing the shapes of the upper and lower artificial teeth corresponding to the shape of the ridge on the computer, and connecting the artificial tooth shape and the ridge shape to the denture base The step of producing the shape of, the step of collecting the jaw movement data which is electronic data showing the jaw movement of the patient, based on the jaw movement data, in the movement state of the jaw,
Based on the stress analysis process that analyzes the stress acting on the artificial tooth, the floor and the ridge, and based on the above analysis, the artificial tooth of the artificial tooth can be obtained so that the optimal occlusal contact state for maintaining the stability of the denture due to jaw movement can be obtained. A method for producing a plate denture, comprising: a step of correcting the morphology; and a step of producing a plate denture based on the shapes of the obtained denture base and artificial tooth. 2. The method for producing a plate denture according to claim 1, further comprising a stress distribution analyzing step of analyzing a stress distribution in a jaw bone and a mucous membrane forming a maxillary ridge, after the stress analyzing step. 3. The method for producing a plate denture according to claim 2, further comprising a step of calculating the form of the artificial tooth that transmits an appropriate functional force to the jawbone, after the stress distribution analysis step. 4. An upper tray for holding an impression material for taking an impression of an upper jaw, a lower tray for holding an impression material for taking an impression of a lower jaw, and an interval between these upper and lower trays is set to be adjustable in a superposed state. A combination tray with a space adjusting member.