JP2013000324A - Partial denture mounting structure, method for fabricating the same, and partial denture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a partial denture mounting structure or the like which can reduce the load applied to a clasped tooth, which do not require high-level technical proficiency, which greatly reduces the number of times for repeated adjustments carried out within the oral cavity, and the fabrication process, and which can simplify the schedule of occlusal adjustment.SOLUTION: The partial denture mounting structure includes an artificial tooth 16, a denture base 35 that holds the artificial tooth, and a fitting member fixedly secured to the denture base and configured to be fitted to a clasped tooth K, wherein the fitting member is a ring member having a height of less than 4 mm, and the ring member is fitted to the root portion of the clasped tooth.

Description

  The present invention, while reducing the burden on the dental caries, does not require a highly skilled technique in the dental clinic, can greatly reduce the number of adjustments in the oral cavity, the number of repairs in the laboratory, and the manufacturing period, In addition, the present invention relates to a highly durable partial denture mounting structure, a manufacturing method thereof, and a partial denture that can simplify the setup for meshing adjustment.

  The partial denture is an artificial tooth that replaces the missing tooth, a denture base that fixes the artificial tooth and adheres closely to the ridge, a clasp that is fixed to the denture base and that can be freely attached to and detached from the remaining tooth, and its clasp It is usually composed of a rest or the like formed integrally. These rests and clasps are fitted into the teeth that are the remaining teeth and exert the action of maintaining the position and posture of the partial denture stably. However, this clasp and rest strongly restrains the caries, and when a lateral force is applied, a large moment acts on the root of the tooth according to the lever principle, which amplifies the user's discomfort and improves the health of the caries There was a possibility that the sex was impaired. Furthermore, since a large stress is applied, there is a surface that is easily damaged and lacks durability.

In order to eliminate such difficulties, a partial denture that fits a C-shaped clasp without using a rest so that it is applied only to the lower root of the tooth ridge, that is, only to the root of the tooth that is almost in contact with the upper gingival edge. (Patent Documents 1 and 2). By exerting the fitting force only on the root of the tooth, the burden on the tooth is greatly reduced. This is because the stress applied to the root of the tooth greatly reduces the magnitude of the moment generated around the root of the tooth compared to the stress applied to the top of the tooth. The sense of restraint on the tooth decay is eliminated, and the durability of the tooth decay can be enhanced because a large moment does not occur around the root.
The method of applying the fitting force only to the tooth root of the toothed teeth is also applied to so-called non-metal dentures that do not use a metal clasp, and a structure that only fits the root of the toothed tooth with a resin fitting is proposed. (Patent Documents 3 and 4).

  In order to reduce the restraining force of the above-mentioned clasp on the tooth and to make the most of the fixing function of the tooth as a flow different from the flow that does not change the tooth as much as possible, There is also a tide of scope partial dentures (Non-patent Document 1). In this partial denture of the Cornus telescope, in most cases, after removing the nerve of the tooth decay, a metal covering called an inner crown is fixed to the tooth decay. This inner crown covers the teeth completely from the crown like a hat. In addition, the partial denture is provided with a metal cover (outer crown) that completely covers the inner crown at a position where the clasp has been conventionally provided. By covering the outer crown over the inner crown, the partial denture is firmly fixed in the oral cavity. According to the Cornus telescope partial denture, the partial denture is stably fixed.

Japanese Patent No. 4270578 Japanese Patent No. 4686541 Patent No. 4309998 JP 2010-201092 A

Masahiko Kuroda “Konus Krone” Ishiyaku Shuppan Publishing Co., Ltd., April 15, 2007 1st edition, 14th edition

For partial dentures that are fitted only to the root of the tooth, in order to form the fitting part, it is necessary to have a mastery of various patient oral aspects. Furthermore, it is necessary to repeat a high precision denture production technique and many reworking at a dental laboratory (hereinafter referred to as a laboratory). Therefore, there is a demand for a partial denture that can be easily manufactured by ordinary dentists and has excellent wearing feeling and high durability.
In addition, for the Conus Telescope partial denture, the outer crown is placed on the inner crown of the toothed tooth to increase the fixing force, so a large load (moment) is applied to the tooth root of the toothed tooth according to the lever principle. In some cases, the roots of the teeth were damaged such as broken roots. Further, since the double teeth are put on the toothed teeth, it is necessary to make an adjustment from the covering stage of the inner crown in consideration of a certain degree of meshing, and to adjust the final meshing at the stage of the outer crown. For this reason, the adjustment and attention of meshing become complicated, and this requires a lot of experience and skill.
The partial denture that only fits at the root of the tooth attaches importance to the patient's wearing feeling, and the Conus telescope partial denture is a special partial denture that emphasizes the stability of the wearing state. It is inevitable that the number of adjustments and the number of repairs at the laboratory will increase. However, it goes without saying that in order to reduce the burden on the patient, it is desirable that the number of adjustments and reworking is small and the manufacturing period is short.

  The present invention, while reducing the burden on the dental caries, does not require a highly skilled technique in the dental clinic, can greatly reduce the number of adjustments in the oral cavity, the number of repairs in the laboratory, and the manufacturing period, Moreover, it is an object of the present invention to provide a highly durable partial denture mounting structure, a manufacturing method thereof, and a partial denture that can simplify the adjustment of meshing adjustment.

  The partial denture mounting structure of the present invention is a partial denture mounting structure including an artificial tooth, a denture base that holds the artificial tooth, and a fitting body that is fixed to the denture base and is fitted to the tooth. In this mounting structure, the fitting body has a ring shape with a height of less than 4 mm, and the ring-like fitting body is fitted to the root portion of the toothed tooth.

Generally, when the outer crown covers the edge portion (top corner portion) of the toothed portion, a large moment is applied to the tooth root portion due to the lever principle, and the load on the tooth root portion is increased. In the conventional conus telescope partial denture, the portion corresponding to the fitting body is an outer crown (complete cover), and naturally, a large stress is applied to the top corner portion of the tooth.
According to the present invention, a ring-shaped fitting body (hereinafter referred to as “ring body”) is penetrated by the toothed hook and is naturally fitted to the root portion thereof. The apex of the tooth decay protrudes from the ring body and is exposed. For this reason, no stress is applied from the ring body to the top and top corners of the tooth decay, and only the lower part of the side peripheral surface. Therefore, the moment around the tooth root of the tooth decay is stressed on the tooth top. Compared to, it is greatly reduced. For this reason, the burden concerning a tooth decay is small and can maintain high durability. In addition, the discomfort in the oral cavity is very small compared to a structure in which the tooth decay is completely covered with a covering (outer crown).
In addition, the occlusal adjustment can be performed on the top portion of the toothed teeth protruding from the ring body, for example, at an early stage of production irrespective of the fitting body. For this reason, the meshing adjustment can be easily performed, and it is not necessary to perform the meshing adjustment on the outer crown at the technical laboratory (laboratory) stage as in the case of the conventional conus telescope partial denture. For this reason, the opportunity to take the process for forming an occlusal surface increases, and it is simplified, and it is not necessary to consider the thickness of the top part of an inner crown like the conventional case. However, it is the same as in the past that fine adjustment is necessary in the meshing adjustment at the dental clinic. In terms of the delicate adjustment, in the case of the present invention, the adjustment is limited to the occlusal adjustment of only the toothed teeth, and the rest is a process on the side of the laboratory, so that the occlusal adjustment at the dental clinic is easy. Is definitely obtained.
Furthermore, it should be noted that in the case of a ring body, it can be easily embedded and fixed in the denture base. For example, based on taking an impression from the patient's oral cavity, a denture base with artificial teeth can be formed, and after the dental caries covering and ring body are manufactured, the partial denture mounting structure can be finished immediately in the next medical examination. Details will be given in the description of the manufacturing method.
From the above, the main meshing adjustment is performed on the toothed teeth, and the fitting body that fits into the toothed teeth is a ring body, and has a relatively simple structure compared to the conventional conus telescope partial denture. For this reason, it is not necessary to form a fitting part with a subtle shape in the above-mentioned partial denture mounting structure, and not so much need for an expert dental intuition. Therefore, a comfortable partial denture can be provided to a patient without great difficulty even for a dentist with relatively little experience. Furthermore, the ring body is easy to be embedded and fixed in the heat-polymerized resin, and by using a unique suitable handling method for the heat-polymerized resin (details will be explained in the section of the production method), the number of adjustments in the oral cavity, The number of repairs at the laboratory and the manufacturing period can be greatly reduced.
Moreover, since the fitting body is a ring body, when fitting, the air between the toothed hook and the ring body can be easily removed, and the mounting is easy. In the case of a conventional Conus telescope partial denture, when the dimensions are finished densely, the air between the outer crown corresponding to the ring body (complete cover) and the tooth decay is difficult to escape (especially the taper angle of the inner crown is However, since the top of the ring body is open, such a situation cannot be considered at all.

  As the ring-shaped fitting body, it is preferable to use a fitting whose outer surface is convex in the cross section. Thereby, excellent durability can be ensured by obtaining high rigidity. As long as the outer surface is convex outward, it may be a convex curved surface or a polygon, and the polygon may be a rectangle or a triangle.

The denture base of the partial denture can have a structure in which the outer peripheral side of the ring body is covered while the side peripheral surface of the toothed portion on the top side from the portion where the ring body is fitted.
Accordingly, the auxiliary function of the ring body can be shared by the denture base while the ring body is securely fixed to the denture base.

A convex part is provided in the outer peripheral surface of a ring body, the circumference | surroundings are surrounded by a denture base, and it can fix to this denture base.
Said convex part can penetrate into a denture base like an anchor (錨), and can increase a fixing force.

The tooth decay is formed on a remaining tooth or an artificial tooth on an implant (artificial tooth root), and in the remaining tooth or the artificial tooth on the implant, a tooth covering that covers only the periphery of the side surface or the entire surface including the top, Can be provided.
In this case, the above-mentioned two kinds of tooth coverings are roughly applied to the remaining teeth or the artificial teeth on the artificial root (implant). Such a tooth covering in a tooth decay is relatively simple in shape, and a normal level can be manufactured without much difficulty.
Of course, the occlusal surface is formed on the top surface of the remaining tooth or artificial tooth on the implant. In particular, when the artificial tooth on the implant is a toothed tooth, an implant can be produced by selecting an appropriate part of the upper or lower jaw where the artificial tooth root is to be implanted, and a partial denture with one artificial tooth on the implant as a toothed tooth. Can be manufactured. For this reason, partial dentures can be manufactured using one implant as a foothold, for example, without using a full denture. Of course, it does not matter if the teeth on multiple implants are toothed. In addition, when a plurality of tooth decays are used, if a satisfactory partial denture cannot be produced with only the remaining teeth, the tooth decay can be provided at an appropriate position by an implant to be a main tooth decay. By using the implant, the choice of tooth decay when manufacturing a partial denture is greatly expanded.
Furthermore, even if there is only one remaining tooth (13 missing teeth), it may be a partial denture having one remaining tooth as a tooth and the remaining 13 artificial teeth.

When the remaining tooth in which the tooth is formed is a deactivated tooth without nerves, a tooth cover covering the entire surface including the top of the deactivated tooth is provided, or only the side periphery of the deactivated tooth is covered. A tooth covering can be provided.
As a result, in the case of inactivated teeth, it is covered with a toothed tooth covering covering the top or a toothed covering covering only the side peripheral surface, so that strong reinforcement is obtained and the ring body does not exert stress on the top. Therefore, the function as a tooth decay can be kept long enough.
In many cases, the above-mentioned tooth covering covering only the periphery of the side surface is the periphery of the side surface of the remaining tooth, ie, the root side.

When the remaining tooth on which the tooth decay is formed is a vital tooth having a nerve, it is preferable to provide a tooth decay covering that covers only the periphery of the side surface of the vital tooth.
The tooth cover and the ring body can be produced at the same opportunity at the laboratory while directly determining the mutual shape. High accuracy can be maintained without requiring a process such as impression acquisition.
According to the above, in the case of a vital tooth, the top is exposed while penetrating the ring body while only the periphery of the side surface is covered with the toothed tooth covering while leaving the nerve. The tooth decay covering acts as a reinforcement by covering the periphery of the side surface. As a result, the function of the tooth decay can be sufficiently exhibited while keeping the nerve alive, so that it is easy to maintain the soundness for a longer time. In addition, the uncomfortable feeling in the living teeth can be reduced.
Also in the case of vital teeth, the above-mentioned toothed tooth covering that covers only the periphery of the side surface is often around the side surface of the remaining tooth after the ridge.

When the tooth is an artificial tooth on an implant (artificial tooth root) processed, it is preferable that the ring body does not have a tooth covering and the ring body is fitted to the artificial tooth of the implant.
Thereby, a toothed hook can be manufactured without using a toothed tooth covering made of metal.

The artificial tooth of the tooth cover or the implant in the tooth is preferably provided with a taper angle within a range of 1 ° or more and 8 ° or less so as to spread downward from at least the upper part to the middle part of the outer surface.
When the taper angle is less than 1 °, it is often difficult to remove the mounted partial denture. When the taper angle exceeds 8 °, the maintenance force is reduced and it is easy to come off. In particular, when the angle is set to 2 ° or more and 6 ° or less, a moderate balance between ease of removal and maintenance force can be obtained. Thereby, the fitting force can be more reliably applied to the root portion of the tooth decay. It should be noted that the inner surface of the ring body is naturally tapered so as to match the taper of the toothed sheath.
As for the taper of the tooth cover in the above-mentioned tooth decay, if the remaining teeth or the protuberances of the artificial tooth are slightly ground together, it becomes easy to produce the taper or the like at the laboratory. In the Cornus telescope partial denture, there is a milling machine with a taper action of the inner crown, and a taper can be easily formed with very high accuracy at the laboratory using the milling machine with the taper action.

The taper angle of the tooth decay covering is (1) The taper angle of the upper part remains the same (2) The taper angle is small, and (3) The taper angle is zero (no taper angle). It should be one of them. Here, in the case of (2) and (3) above, the height (width) at which the taper angle becomes small or straight at the root of the tooth decay is in the range of about 1.5 mm to 3 mm from the lower end of the tooth neck. It is good to do.
In any of the above cases, since no stress is applied from the ring body to the top of the tooth decay, the burden on the tooth decay is greatly reduced. In the case of the above (2) to (3), further, the lower wide taper angle of the toothed hook covering does not extend as it is at the root part of the toothed hook, and takes a standing inclination. That is, the tendency of the lower wide taper is reduced, and the tendency of the standing posture (vertical posture) is strengthened. Due to the change of the taper in the root portion to the vertical posture, the force from the ring body is more reliably applied to the root of the tooth decay. As a result, the burden on the tooth decay is further reduced and durability can be maintained. At the same time, the shaking teeth are eliminated by the attachment of the partial denture (fitting of the fitting body), and the shaking teeth are fixed.

It is preferable that the meshing adjustment is made on the top of the toothed teeth exposed from the ring body.
Since the top of the toothed teeth is exposed from the ring body, it naturally forms an occlusal surface. This engagement adjustment can be performed in a convenient manufacturing process (opportunity) irrespective of the ring body. For this reason, compared with the case where mesh adjustment is performed on the outer crown of a conventional conus telescope partial denture, the mesh adjustment itself does not change slightly, but it is concentrated only on the top of the tooth decay. It is only necessary to do so, and there is no need to manufacture it while considering many things. In addition, there are more options for how to put the meshing adjustment process. That is, in the conventional partial denture of the Cornus telescope, the total height of (patient's tooth / inner crown (in the present invention, toothed sheath) / outer crown (in the present invention, ring body)) However, in the present invention, since the fitting body is a ring body, it is sufficient to adjust the occlusion only on the top surface of the toothed teeth. The dental clinic only needs to make fine adjustments regarding the occlusion of the denture.

In the toothed hook covering of the toothed hook, ceramics or resin can be disposed at least in the exposed part.
The above ceramics or resin should be the same white as the teeth. Usually called the vest. As a result, it is possible to enhance aesthetics without exposing the metallic luster to a portion that is noticeable.

There is only one toothed hook, and the ring body can be fitted to the single toothed tooth so that it can be mounted.
Even when the number of remaining teeth is one, by using the partial denture mounting structure of the present invention, the mounting feeling is excellent and mounting stability can be improved.

The partial denture of the present invention includes an artificial tooth, a denture base that holds the artificial tooth, and a fitting body fixed to the denture base. In this partial denture, the fitting body has a ring shape with a height of less than 4 mm, and is fitted to the root portion of the tooth decay.
Thereby, the ring body which is a fitting body in the partial denture is penetrated by the toothed teeth, and the top part of the toothed teeth protrudes from the ring body. Naturally, no stress is applied from the ring body to the apex of the tooth decay, and it is applied to the side peripheral surface. Therefore, since a big moment does not generate | occur | produce around the tooth root of a toothed hook, a burden is small and it can maintain durability.
Since the ring body has a relatively simple structure and the like, it is not necessary to form a delicate fitting portion for the above-mentioned partial denture, so that it does not require so much dentist intuition. For this reason, even a dentist who has relatively little experience can be manufactured without great difficulty.
Further, since the fitting body is a ring body, the uncomfortable feeling in the teeth or the oral cavity is reduced. In addition, it is difficult to remove the air between the toothed hook and the ring body at the time of wearing, and the wearing becomes easy. Furthermore, the number of adjustments in the oral cavity, the number of repairs at the laboratory, and the production period can be greatly reduced.

The denture base of the partial denture should cover the outer peripheral side of the ring-shaped fitting body while covering the side peripheral surface of the toothed portion on the top side from the portion where the ring-shaped fitting body is fitted.
Accordingly, the auxiliary function of the fitting body can be shared by the denture base while the ring body is securely fixed to the denture base.

A convex part is provided in the outer peripheral surface of a ring body, it is good to surround the circumference | surroundings to a denture base and to fix to this denture base.
The convex part of the outer peripheral surface of the ring body functions as an anchor (錨) in the denture base to increase the fixing force.

The inner peripheral surface of the ring-shaped fitting body may be composed of a single lower tapered surface or a two lower tapered surface where the lower tapered surface stands above the upper.
Thereby, it can match with the taper of the outer surface of a toothed hook covering.

  A method for manufacturing a partial denture mounting structure according to the present invention includes an artificial tooth, a denture base formed of a heat-polymerized resin that holds the artificial tooth, and a fitting body that is fixed to the denture base and is fitted into the tooth. A partial denture mounting structure is manufactured. This manufacturing method includes a step of forming a dental caries covering a patient's caries original body (residual tooth (deactivated tooth or vital tooth) or artificial tooth of an implant) to form a tooth, A step of forming a ring-shaped fitting body having a height of less than 4 mm to be fitted to the tooth decay, a step of fixing the tooth decay covering body in the oral cavity of the patient at the dental clinic, and a tooth decay A step of fitting a ring-shaped fitting body to a tooth formed by covering the covering body, and a hole location where the fitting body is to be fixed in the denture base holding the artificial tooth (this hole location is an artificial portion) A step of applying a rebase material to the toothed denture base (denture part) in the course of manufacturing in a technical laboratory), passing the hole portion where the application has been made into hot water of 75 ° C. or higher, Penetrates through the applied hole, and the fitting is in the denture base The denture base with artificial teeth is pushed into the denture base so that it is inserted, and after resting for a predetermined time, and the ring-like fitting body is fixed to the denture base, the denture base is fixed to the denture base. And a step of detaching.

Immediate polymerization resin or room temperature polymerization resin used as a rebase material for denture base made of heat polymerization resin will have a suitable viscosity when boiled in hot water of about 85 ° C, and it is relatively firm on the surface. Has a film. That is, the immediate polymerization resin or the room temperature polymerization resin is very easy to handle in practice in a dental clinic when combined with the treatment of blanching. Easy handling means that it is easy to increase the thickness by rebasing by blanching, and the thickness can be easily adjusted. In addition to this, in order to maintain softness that is easy to use by blanching, for example, it is easy to allow the ring body to enter, and unnecessary excess portions or protruding portions can be easily removed as unnecessary portions. From another viewpoint, the rebase material has an appropriate viscosity because it coats the surface after pouring, and does not flow like a liquid, and can be handled as a single object. When a predetermined time elapses, the immediate polymerization resin or the like is solidified and the strength is rapidly increased. By this rapid increase in strength, for example, the ring body can be taken into the denture base and firmly fixed.
The immediate polymerization resin or the like used for the above rebase material is a normal type and is preferably a type that can be rebased on the patient's oral cavity on site.
Based on the impression taken from the patient's oral cavity, after forming a denture base with artificial teeth and manufacturing a tooth cover and a ring body, a partial denture mounting structure is immediately prepared by only one adjustment as follows. Can be finished.
That is, first, in the dental clinic, the dental caries covering is fixed to the dental caries (residual tooth or artificial tooth of the implant) in the patient's oral cavity (on-site). Next, a ring body, which is a fitting body, is fitted to the toothed tooth covering. In the denture base made of the heat-polymerized resin with artificial teeth, a hole (a diameter larger than the diameter of the tooth / fitting body) is drilled in advance at a position corresponding to the tooth. An immediate polymerization resin or a room temperature polymerization resin, which is a rebase material, is applied around the hole (hole location). Various types of instant polymerization resins and room temperature polymerization resins are commercially available. Next, the hole portion where the coating is applied is poured into hot water of 75 ° C. or higher. As a result, the immediate polymerization resin or the room temperature polymerization resin becomes easy to handle as described above. Therefore, the denture base is pushed in so that the toothed tooth with which the ring body is fitted is aligned with the hole position, and the toothed tooth penetrates the hole position and the ring body is embedded in the denture base. The ring body is embedded in a rebase denture base that is kept soft by blanching. As it is, the heat-polymerized resin is cooled and solidified to increase the strength when a predetermined time period of several minutes elapses. As a result, the ring body is embedded and fixed in the denture base. When the denture base is detached from the tooth decay, the ring body is pulled out from the tooth decay fitted and fixed in the denture base. Thereby, in the partial denture, the ring body as the fitting body is embedded and fixed, and the finished state is obtained by performing the entire rebase and the like.
In the above manufacturing process, if a denture base with artificial teeth, a tooth cover and a ring body can be formed by taking an impression, then a partial denture and its mounting structure are finished on-site at a dental clinic. This has been dramatically shortened and simplified in the manufacture of partial dentures and their mounting structures. As a result, the burden on the patient and the burden on the dental clinic and the laboratory can be greatly reduced.
The invention of the above manufacturing method is a special one of the manufacturing methods. The partial denture and its mounting structure of the present invention do not necessarily have to be manufactured by the one special manufacturing method described above. One special manufacturing method described above is one of the manufacturing methods that can greatly shorten and simplify the process as an invention of the manufacturing method.

  According to the present invention, while reducing the burden on the dental caries, less advanced skill is required in the dental clinic, and the number of adjustments in the oral cavity, the number of repairs at the laboratory, and the production period are significantly reduced. In addition, it is possible to provide a highly durable partial denture mounting structure and the like that can simplify the setup for meshing adjustment.

It is a perspective view which shows the mounting structure of the partial denture in Embodiment 1 of this invention in a plaster model. It is sectional drawing which follows the II-II line | wire of FIG. It is a perspective view (front side) of the partial denture shown in FIG. It is the perspective view seen from the back surface of the partial denture of FIG. It is a ring body which is a fitting body, (a) is a figure which shows the case where there is no convex part on an outer peripheral surface, and (b) is the case where there is a convex part on an outer peripheral surface. It is a gypsum model which shows the tooth decay in the mounting structure of the partial denture shown in FIG. 4 is a flowchart showing a manufacturing process of the partial denture mounting structure of the first embodiment. (A) is an example of an embodiment of the present invention, and is a sectional view showing a partial denture mounting structure which is Modification 1 of Embodiment 1, and (b) is an example of its dimensions and an example of an angle. It is an example of an embodiment of the invention, and is a cross-sectional view showing a mounting structure for a partial denture according to Modification 2 of Embodiment 1. It is a perspective view which shows the mounting structure of the partial denture in Embodiment 2 of this invention. It is sectional drawing which follows the XI-XI line of the mounting structure of FIG. It is an example of an embodiment of the invention, and is a cross-sectional view showing a mounting structure for a partial denture according to Modification 1 of Embodiment 2. It is sectional drawing which shows the mounting structure of the partial denture in Embodiment 3 of this invention. It is sectional drawing which shows the modification of the mounting structure of the partial denture in FIG. It is a perspective view which shows the mounting structure of the partial denture in Embodiment 4 of this invention. It is a plaster model which shows the tooth decay in the mounting structure of the partial denture shown in FIG. It is sectional drawing which follows the XVII-XVII line of FIG.

(Embodiment 1)
FIG. 1 is a perspective view showing a partial denture mounting structure 50 according to Embodiment 1 of the present invention. In FIG. 1, the upper jaw of a patient wearing the partial denture 10 is shown on a plaster model M. The partial denture 10 is mounted on the oral cavity (tooth) of the plaster model M, and the mounting structure 50 is formed. In the patient, three toothed teeth K are formed, and the mounting structure 50 is formed in such a manner that a fitting body (not shown in FIG. 1 surrounded by the denture base 35) penetrates the toothed teeth K. The patient's caries K is left 7 (L ₇ ), right 3 (R ₃ ) and right 5 (R ₅ ). The three toothed teeth K are covered with a toothed covering 31 as described later. Any material can be used for the toothed covering 31, but the metal covering 31 is often used because the metal is easy to manufacture and has high durability. In this embodiment, the toothed hook K is always covered with the toothed hook covering 31 (although there is a difference between the whole including the top part or only the side peripheral surface). 31) may be displayed. In some cases, “toothed covering” and “metal covering” or “covering” are used interchangeably. In the case shown in FIG. 1, the partial denture 10 is stably held with three toothed teeth K (31) as main fitting locations.
The partial denture 10 is provided with a ring-shaped fitting body 11, and a toothed tooth K (31) passes through the ring-shaped fitting body 11 so that a top portion 31 t protrudes and is exposed. When the toothed teeth K enter and penetrate the ring-shaped fitting body 11 (fitting is realized), the attachment of the partial denture 10 to the toothed teeth K is realized.

FIG. 2 is a cross-sectional view of the left seventh (L ₇ ) toothed hook K (31) in FIG. In the present embodiment, as shown in FIG. 2, the fitting body 11 has a ring shape (hereinafter, referred to as “ring body”), and is characterized by being fitted to the root portion of the toothed hook K.
The denture base 35 is in close contact with the ridge mucosa 8 on its back surface, but the back surface of the denture base and the bottom end 11b of the fitting 11 are aligned. The patient's left 7th tooth 5 has a root 5b, but is a deactivated tooth and is nervous. Furthermore, the whole is covered with a metal covering 31 from the top. A meshing occlusal surface is formed on the top 31 t of the metal covering 31. A tapered surface 31 s is formed on the side peripheral surface of the covering 31 so as to spread at the base, and a smooth conical surface (side peripheral surface) having a metallic luster is formed. The angle (taper angle) of the conical surface with respect to the vertical direction is in the range of 1 ° to 8 °. When the taper angle is less than 1 °, it is often difficult to remove the mounted partial denture. When the taper angle exceeds 8 °, the maintenance force is reduced and it is easy to come off. In particular, when the angle is set to 2 ° or more and 6 ° or less, a moderate balance between ease of removal and maintenance force can be obtained.
The denture base 35 covers the periphery of the fitting body 11 and contributes to fixing the fitting body 11. In general, the fitting body 11 may be attached to the denture base 35 by any method, and can be fixed to the denture base 35 by a known method.

Next, advantages of using the ring body 11 as the fitting body will be described. When the outer crown is covered on the top edge (top corner) of the toothed tooth K like a conventional denture of a conus telescope, a large moment is applied to the tooth root due to the lever principle and the burden on the tooth root becomes large. Become. In the conventional case, the portion corresponding to the fitting body is an outer crown (complete cover), and naturally, a large stress is applied to the top corner portion of the tooth. According to the ring body 11 shown in FIG. 2, the ring body 11 is penetrated by the toothed hook K and is naturally fitted to the root portion thereof. Naturally, the top of the toothed hook K protrudes greatly from the ring body 11. For this reason, no stress is applied from the ring body 11 to the top and top corners of the toothed teeth, and only the lower part of the side peripheral surface. Therefore, the moment around the tooth root of the toothed teeth K is stressed at the top of the toothed teeth. Compared to such a case, it is greatly reduced. For this reason, the burden concerning the tooth decay K is small, and high durability can be maintained. In addition, the sense of incongruity in the oral cavity is naturally reduced as compared with the case where the tooth decay K is completely covered with the covering (outer crown).
In addition, the occlusal adjustment can be performed on the apex 31t of the toothed hook K protruding from the ring body 11 irrespective of the ring body 11, for example, at an early stage of production. For this reason, the meshing adjustment can be easily performed, and it is not necessary to perform the meshing adjustment on the outer crown at the technical laboratory (laboratory) stage as in the case of the conventional conus telescope partial denture. As a result, the opportunity to take a process capable of forming the occlusal surface (opportunity for forming the occlusal surface) is increased and simplified, and it is not necessary to consider the thickness of the top of the inner crown as in the conventional case. . However, it is the same as in the past that fine adjustment is necessary in the occlusion adjustment itself in the dental clinic. Also in terms of the delicate adjustment, in the case of the present invention, since the adjustment is limited to the occlusal adjustment of only the toothed teeth, the advantage that the occlusal adjustment is easy can be surely obtained.
Further, it should be noted that in the case of the ring body 11, it can be easily embedded and fixed in the denture base 35. For example, based on taking an impression from the patient's oral cavity, after forming a denture base 35 with artificial teeth 16 (denoted as a denture part) and manufacturing the tooth cover 31 and the ring body 11, only one adjustment is required. Immediately complete the partial denture mounting structure. Details will be described in the description of the manufacturing method (see FIG. 7).
From the above, the main meshing adjustment is performed on the toothed teeth, and the fitting body fitted to the toothed teeth is the ring body 11, which has a relatively simple structure as compared to the conventional conus telescope partial denture. . For this reason, it is not necessary to form the fitting part of a delicate shape in the above-mentioned partial denture mounting structure, and not so much an expert dental intuition is required. A relatively inexperienced dentist can be provided with a comfortable partial denture to the patient without great difficulty. Furthermore, the ring body 11 is easy to embed and fix in the heat polymerization resin used for the denture base 35, and by using a unique suitable handling method for the heat polymerization resin (details will be described in the section of the manufacturing method). The number of adjustments in the oral cavity, the number of repairs at the laboratory, and the production period can be greatly reduced.
Moreover, since the fitting body is the ring body 11, when fitting, the air between the toothed hook K and the ring body 11 is easy to escape and the mounting becomes easy. In conventional Cornus telescope partial dentures, the air between the outer crown (complete cover) corresponding to the ring body 11 and the toothed tooth K may be difficult to escape when the dimensions are finished densely. There is nothing like that in body 11.

When forming the metal covering 31, the tooth 5 is processed by a dental cutting machine or the like in consideration of the balance in the oral cavity such as the shape and size of the mounting structure 50 including the ring body 11. In FIG. 2, the tooth 5 has a well-shaped shape corresponding to the covering 31, but actually, the shape may be deformed as long as there is a tooth root 5 b, or dental caries may be treated and an excavation hole may be provided. . Such collapse of the shape is absorbed on the inner surface side of the metallic covering 31. Even in the case of such a deformed tooth 5, the outer surface covered with the metal covering 31 has a shape having an artificial conical surface with a metallic luster except for the top 31t. Therefore, it can be said that the rough shape is an “artificial truncated cone having an unevenness (may be described as a petal) by meshing adjustment” on the top (see FIG. 6).
As a matter of course, the inner surface 11 i of the ring body 11 is also tapered so as to match the tapered surface 31 s of the toothed hook 31.
In most cases, the material of the tooth cover 31 is a metal from the viewpoint of ease of manufacture, durability, and the like, and the metal may be anything as long as it is a normal dental casting alloy. Platinum alloy, gold silver palladium alloy, other alloys, etc. can be used. Of these, platinum plating is most desirable.

As described above, the toothed hooks K covered with the metal covering 31 are fitted into the ring body 11 in such a form as to protrude through the ring body 11. The same number 11 is used for the fitting body and the ring body. Needless to say, the fitting body 11 is provided (fixed) to the partial denture 10. The ring body 11 is in contact with the lower portion of the side peripheral surface of the metal covering 31 and surrounds the root portion of the toothed hook K. For this reason, irrespective of the ring body 11, the top part 31t of the metal covering 31 can be an occlusal surface.
The material of the ring body 11 is also usually a metal from the standpoint of ease of manufacture, durability, etc., and the metal can be anything as long as it is a normal dental casting alloy. Platinum alloy, gold silver palladium alloy, other alloys, etc. can be used. Of these, platinum added is preferable.

In FIG. 2, the bottom 11 b of the ring body 11 is drawn so as to contact the ridge ridge mucosa 8. Such an end may form a surface to make a surface contact. Further, it may be separated (floating) from the ridge mucosa 8 by, for example, about 0.5 mm to 1 mm. Furthermore, the end of the bottom 11b of the ring body 11 may be tapered so that the outer surface approaches the inner surface toward the end so as to form a single blade. As a result, the bottom 11b of the ring body 11 may be linear without forming an end face. Further, the outer tapered surface may be planar or convex.
The description of the bottom 11b of the ring body 11 and the denture base 35 on the cheek side also applies to the mounting structure 50 thereafter.

FIG. 3 is a perspective view of the partial denture 10 shown in FIG. 1 as viewed from the front surface side. As described in FIG. 1, the ring bodies (not visible in FIG. 3) are arranged at the locations L ₇ , R ₃ , R ₅ corresponding to the toothed teeth.
FIG. 4 is a perspective view of the partial denture 10 shown in FIG. 3 as viewed from the back side. The denture base 35 surrounds the ring body 11 and fixes the ring body 11. That is, the denture base 35 is also turned to the cheek side, and the fixation of the ring body 11 to the denture base 35 is strengthened. Since there are no artificial teeth on the back side, the bottom end 11b and the inner surface 11i of the cylindrical fitting body 11 can be clearly seen. The bottom end 11b is aligned with the back surface 35b of the denture base 35. By extending the ring body 11 to the back surface 35 b of the denture base 35, the force from the ring body 11 can be reliably applied to the root portion of the toothed hook 31. As a result, the moment around the tooth root 5b of the tooth 5 can be reduced compared to the case where the entire tooth including the top portion of the toothed hook 31 is applied in the conventional conus telescope partial denture. 5 and the load on the tooth root 5b can be greatly reduced. Thereby, durability can be improved. Moreover, since the fitting body is the ring body 11 and a stress is applied to the lower portion of the toothed teeth in cooperation with the lower tapered shape, the burden on the tooth root portion is further reduced and the discomfort in the tooth is greatly reduced. Furthermore, since the fitting body is the ring body 11 at the time of mounting, the air between the teeth does not hinder the mounting.
Compared to this, in the conventional conus telescope partial denture, the fitting body was an outer crown of a completely covered object, so a large force was added to the top of the tooth decay, causing damage to the root of the tooth, etc. . In addition, there is a case where air between the outer crown and the tooth is difficult to escape during the mounting.

  FIG. 5 is a diagram showing the ring body 11. FIG. 5 (a) shows a normal ring body 11, and an inner surface 11i has a taper that is broader corresponding to the taper of the outer surface of the metal covering 31 shown in FIG. Although the shape of the ring body 11 shown in FIG. 5 (a) may be used, the protrusion 11g is provided on the outer peripheral surface as shown in FIG. Act as an anchor. That is, when the rebase material integrated with the denture base 35 is solidified, the embedded ring body 11 is not easily detached from the denture base 35. As a result, it is possible to contribute to the firm fixation of the ring body 11 to the denture base 35.

FIG. 6 is a diagram showing a toothed tooth K (31) in the plaster model M of the patient. The remaining tooth 5 is located in the toothed tooth K (31) with the root 5b. The toothed hooks K (31) are covered with the metal covering 31 as described above. The top 31t of the metal covering 31 is adjusted so as to be an occlusal surface. The top portion 31t of the metal covering 31 penetrates the portion (hole) to which the ring body of the partial denture 10 shown in FIG. 3 is fixed and protrudes upward from the ring body 11 to become an occlusal surface. . Since the toothed hook K is covered with the metal covering 31, the tooth 5 can be reinforced and the overall strength can be maintained. For this reason, a partial denture can be firmly and stably hold | maintained with a small number with the ring body 11. FIG. And about a tooth decay, since the burden to a tooth root part is reduced greatly as mentioned above, a tooth decay itself is also protected.
The metallic covering 31 and the ring body 11 in the toothed hook K are geometric except for the meshing surface 31t, and do not require much fine adjustment. Further, as will be described later, the meshing can be adjusted when the metal covering 31 is produced regardless of the ring body 11. For this reason, the partial denture 10 can be produced relatively easily without the need for a highly skilled dental intuition and sense. In particular, after the metal covering 31 is fixed, the upper and lower occlusal relations are determined and it is sufficient to concentrate only on the toothed teeth K, so that it is easy to obtain the occlusion at the dental clinic.
In addition, when forming a tooth decay in a deactivated tooth, as shown in FIG. 6, you may cover the whole from a deactivated tooth with the metal coating 31, or only the side peripheral surface of a deactivated tooth It may be covered with a metal covering 31 so as to surround.

FIG. 7 is a flowchart for explaining a method of producing the partial denture 10 and its mounting structure 50 in the present embodiment. First, the tooth 5 is processed in order to form the tooth decay K (31) in the patient's oral cavity. Thereafter, an impression is taken, the mold of the tooth 5 is taken, and a mold is produced. The mold of the metal covering 31 is preferably formed by using a manufacturing apparatus such as a milling machine for tapering the inner crown so that a highly accurate tapered surface is formed on the outer surface. At this time, both the metal covering 31 and the ring body 11 are produced using the produced mold. Both the metal covering 31 and the ring body 11 are preferably made of platinum metal as the metal, and the thickness of the side surface and the top is equal to that of a conventional crown or the like. Further, as described above, the outer surface of the metallic covering 31 is tapered with a taper angle of 1 ° to 8 °. A taper corresponding to the inner surface 11 i of the ring body 11 is attached.
The metal coating 31 produced by casting is processed with a dental cutting machine or the like so as to cover the tooth 5 and then fixed to the tooth 5 using an adhesive such as cement. Then, the ring body 11 is fitted to the metal covering 31. At this time, the metal covering 31 is fixed to the tooth so as to constitute the toothed hook K, and the ring body 11 is fitted to the toothed hook K.
On the other hand, based on the obtained impression, a denture portion including the denture base 35 and the artificial tooth 16 fixed to the denture base 35 is manufactured. That is, the fitting body or the ring body 11 is not yet attached to the denture base 35. The ring body 11 is fitted to the toothed hook K in the patient's mouth. In the denture base 35, the denture base 35 extends at a place where the fitting body (ring body) 11 is to be attached.
Here, in the denture base 35, a hole is provided in a technical laboratory at a place where the ring body 11 is to be attached. This hole is naturally provided when a wax pattern (wax denture) is produced. In a dental clinic, a partial denture is manufactured using the denture part provided with such a hole, according to a patient's oral condition.
That is, in the dental clinic, a rebase material such as an immediate polymerization resin is applied to the hole portion, and then the portion of the denture base including the rebase material application portion is poured into hot water at about 85 ° C. It is assumed that the denture base 35 is made of a heat polymerization resin. The denture base type may be a type including a metal plate or a resin floor type. Since it is softened with a moderate viscosity by passing it through hot water at 85 ° C, and has a film that is convenient for operability on the surface, it is easy to increase the thickness by rebase treatment in practice in the dental clinic, and the thickness adjustment is also possible It becomes easy. In addition, since moderate softening can be obtained by blanching, for example, the ring body 11 can easily enter the denture base around the hole through the rebase material. And the unnecessary surplus part or the part which protruded will be in the state which can be easily removed before solidifying completely. From another point of view, in order to obtain an appropriate softening and an appropriate viscosity after pouring and a film is applied to the surface, it does not flow like a liquid and can be handled as a single object. The immediate polymerization resin or the room temperature polymerization resin is solidified with time and increases its strength rapidly. Due to this rapid increase in strength, for example, the ring body 11 can be firmly fixed in a state where it is embedded in the denture base 35. If the ring body 11 is provided with a convex portion 11g as shown in FIG. 5B, the convex portion 11g functions as an anchor in the denture base 35 and contributes to strong embedding and fixing.
After the rebase material is solidified, when the denture base 35 is detached from the toothed teeth K, the ring body 11 is embedded and fixed in the denture base 35, so that the denture base is pulled out from the fitting to the toothed tooth K (31). Follow 35. Thereafter, the occlusal adjustment can be performed on the metal covering 31 of the toothed hook K regardless of the ring body 11. Thus, the partial denture 10 and the partial denture mounting structure 50 are completed.
The above manufacturing method is a special one of the manufacturing methods. The partial denture and its mounting structure of the present invention do not necessarily have to be manufactured by the one special manufacturing method described above. One special manufacturing method described above is one of the manufacturing methods that can greatly shorten and simplify the process as an invention of the manufacturing method.

The method for manufacturing the partial denture 10 and its mounting structure 50 has been dramatically shortened and simplified, and is easy to understand. After taking the impression, the patient does not have to make adjustments at the dental clinic many times, and the partial denture 10 and its mounting structure 50 can be completed with a single adjustment. Moreover, since it is adjusted on-site and in the oral cavity, it is accurate and can be produced with little deviation.
Since the epoch-making shortening and simplification of this manufacturing method is an important point, it will be explained again while summarizing. First, based on taking an impression from the patient's mouth, a denture base with artificial teeth (denture part) is formed, and after preparing the tooth cover 31 and the ring body 11, the tooth cover 31 and the ring body 11 are formed. A denture base is made on the attached model. Thereafter, the partial denture mounting structure can be finished on-site immediately by only one adjustment as described below. First, in the dental clinic, the dental caries covering 31 is fixed to the dental caries (residual tooth or artificial tooth of the implant) in the patient's oral cavity (onsite). Next, the ring body 11 which is a fitting body is fitted to the toothed tooth covering 31. In the denture base 35 made of the heat-polymerized resin, a large hole is formed at a position corresponding to the tooth K, and then a rebase material is applied around the hole. Thereafter, the portion of the denture base 35 including the hole portion to which the rebase material is applied is poured into hot water at 75 ° C. or higher, for example, about 85 ° C. As a result, the rebase material becomes easy to handle as described above. Therefore, the toothed tooth K fitted with the ring body 11 is aligned with the hole, and the denture base 35 is pushed in so that the toothed hook K penetrates the hole and the ring body 11 is embedded in the denture base. As it is, the rebase material solidifies and suddenly increases its strength when a predetermined time period of several minutes elapses. As a result, the ring body 11 is firmly embedded and fixed in the denture base 35. When the denture base 35 is detached from the tooth decay K, the ring body 11 is pulled out from the tooth decay K while being fixed to the denture base 35. If the ring body 11 is a type with the convex part 11g as shown in FIG.5 (b), the convex part 11g will exhibit an anchor effect and a firm embedding fixation will be implement | achieved. Thereby, in the partial denture 10, the ring body 11 which is a fitting body is firmly embedded and fixed, and is almost finished. Thereafter, the entire rebasing process (using a soft rebasing material and blanching) is performed to achieve final adjustment.
In the above manufacturing process, if the denture base 35 with artificial teeth 16, the tooth cover 31 and the ring body 11 can be formed by taking an impression, then the partial denture 10 and the mounting structure 50 thereof are on-site at the dental clinic. Finished. This has been dramatically shortened and simplified in the manufacture of partial dentures and their mounting structures. As a result, the burden on the patient and the burden on the dental clinic and the laboratory can be greatly reduced.

The partial denture has the following characteristics <F1> to <F5>.
<F1>: The manufacturing method 50 of the partial denture 10 and its mounting structure can be dramatically shortened and simplified. This dramatically reduces the burden on patients, dental clinics, and technical laboratories. The shortening and simplification of the manufacturing method is based on the following technical contents.
(I) The fitting body is the ring body 11 (ii) The denture base 35 is formed of a heat-polymerized resin, a room-temperature polymerization resin or an immediate-polymerization resin is used as the rebase material, and the rebase material is boiled. Applying the method <F2>: The burden on the tooth decay K can be reduced. This is because the fitting body fitted to the toothed hook K is used as the ring body 11, and stress is applied only to the root part of the toothed hook K, so that the moment around the tooth root 5b is greatly reduced. By setting it as the ring body 11, there was no possibility of stress being applied to the top of the toothed hook K. As a result, the durability of the tooth decay and the teeth in the tooth decay can be improved. Further, as described above, since the burden on the tooth root portion is reduced as described above, durability can be obtained.
<F3>: It is possible to produce even relatively inexperienced dentists without the need for skilled dental intuition. This is due to the following reasons (i) and (ii).
(I) Since the fitting body is the ring body 11, there is no possibility of stress being applied to the top of the toothed hook K, and there is almost no fine adjustment in fitting the ring body 11 to the root part of the toothed hook K. No longer needed.
Further, the shape of the covering 31 covering the toothed teeth K is a truncated cone as shown in FIG. 6, and the outer surface is a conical surface with a loose geometric taper angle. In addition, the inner surface 11i of the ring body 11 is also a conical surface having a gentle geometric taper angle. For this reason, it is not necessary to adjust the delicate shape like a conventional C-shaped clasp.
Since there is a conventionally used milling machine for forming the taper of the inner crown, the metal coating 31 of the toothed tooth K or the taper of the outer surface of the tooth of the implant is used in a technical laboratory. An accurate tapered surface can be formed.
(Ii) The meshing adjustment can be performed regardless of the fitting body 11. In the conventional Conus telescope partial denture, the outer crown that completely covers the inner crown including the apex is used as the fitting body, so that the occlusal surface for meshing is formed on the outer crown (fitting body). For this reason, the inner fit and the outer crown had to be produced while considering the meshing adjustment. That is, in the conventional conus telescope partial denture, it is necessary to perform occlusal adjustment in the final outer crown while considering all the total heights of (patient's teeth / inner crown / outer crown). For this reason, a high level of skill is required in the production of conventional conus telescope partial dentures. However, in the present invention, since the fitting body is a ring body, the meshing adjustment may be performed only on the top surface of the toothed hook K, that is, on the occlusal surface of a limited narrow range regardless of the fitting body. For this reason, since the meshing adjustment can be performed regardless of the fitting body, the entire manufacturing including the meshing adjustment can be clearly understood. It should be noted that the meshing adjustment itself does not change that fine adjustment is necessary.
Due to the above reasons (i) and (ii), it can be easily prepared by a dentist with little experience.
<F4>: The durability of the partial denture is high. This can prevent a portion where a large stress is concentrated on a thin metal like a conventional clasp, and thus can improve the durability of a partial denture.
<F5>: Others Decrease in discomfort of teeth or oral cavity during wearing and facilitating wearing. In the case of a conventional conus telescope partial denture, there is a case where air between the toothed hook and the fitting body is difficult to escape during mounting.

(Modification 1 of Embodiment 1)
FIG. 8A is a cross-sectional view of the partial denture mounting structure 50 according to the first modification of the first embodiment, and FIG. 8B is a dimension example or an angle example, which is one example of the present invention. is there. According to FIG. 8, the metal covering 31 is formed with the tapered surface 31 s having a taper angle of 1 ° to 8 ° from the upper portion as described above, but the base portion extends with the same taper angle. In other words, the taper angle becomes smaller or the taper surface 31k having a straight taper angle is formed. Correspondingly, the inner surface 11i of the ring body 11 which is a fitting body is provided with a two-step tapered surface. That is, a two-step lower tapered surface is attached, with the lower tapered surface standing higher than the upper one.
The upper tapered surface 31 s is not extended as it is, and by providing a small tapered angle or a straight bottom tapered surface 31 k, stress can be more reliably concentrated on the root portion of the toothed tooth 31. It becomes like this. As a result, it becomes possible to further reduce the burden on the toothed teeth K or the teeth 5.

(Modification 2 of Embodiment 1)
FIG. 9 is a cross-sectional view of the partial denture mounting structure 50 in Modification 2 of Embodiment 1, and is one example of the present invention. According to FIG. 9, a white coating 31 f is stuck to the top 31 t of the metal coating 31. The covering 31f is preferably white resin or ceramic. By using the white covering 31f, the top 31t of the metallic covering 31 appears white in appearance, and the aesthetics can be improved.

(Embodiment 2)
FIG. 10 is a perspective view showing a partial denture mounting structure 50 according to Embodiment 2 of the present invention. In the first embodiment, the metal teeth 31 covering the toothed teeth K including the top surface cover the remaining teeth 5. However, in the present embodiment, as shown in FIG. 11, the apex surface of the toothed hook K has the apex portion 5 t of the remaining tooth 5 exposed from the cylindrical fitting body. For this reason, the top 5t of the tooth decay is not covered with metal.
11 is a cross-sectional view taken along the line XI-XI in FIG. 10 and corresponds to FIG. 2 of the first embodiment. The difference from the first embodiment is that, as described above, the metal covering 31 on the tooth decay K covers only the side surface 5s without covering the top 5t of the patient's tooth 5. . Thereby, when the remaining tooth which becomes the tooth decay K is a vital tooth, it can be used for the tooth decay without removing the nerve. Living teeth that make the most of nerves are more healthy than inactivated teeth and can maintain a normal state for a long time. As a result, the durability of the toothed teeth 31 and the teeth 5 of the main column can be greatly improved.
In the case of living teeth, a small amount of grinding of the tooth side surface part is also conceivable in order to make it easy to produce a coating on the side surface part. As a result, the subsequent production on the side of the laboratory is greatly facilitated, and greatly contributes to the production at the laboratory.
Features <F1> to <F5> in the first embodiment can be ensured as they are. In addition, since the occlusion in <F3> (ii) has already been adjusted in the living tooth 5, and only a small amount of occlusal adjustment is performed in an abnormal case, it is almost necessary to adjust the occlusion. Therefore, the adjustment to the extent of the conventional partial denture is required.

(Modification 1 of Embodiment 2)
FIG. 12 is a cross-sectional view of the partial denture mounting structure in Modification 1 of Embodiment 2, which is also one example of the present invention. According to FIG. 12, the metal covering 31 is provided with the taper 31s having a taper angle of 1 ° or more and 8 ° or less from the upper portion as described above, but the base portion is extended with the same taper angle. Instead, a straight bottom taper 31k is formed at the base. Correspondingly, the inner surface 11i of the ring body 11 which is a fitting body is provided with a two-step tapered surface. That is, a two-step lower tapered surface is attached, with the lower tapered surface standing higher than the upper one.
The upper taper is not extended as it is, and the straight bottom taper 31k is provided, so that the stress can be more reliably concentrated on the root portion of the toothed hook 31. As a result, it becomes possible to further reduce the burden on the toothed teeth 31 or the teeth 5.

(Embodiment 3)
FIG. 13 is a sectional view showing a partial denture mounting structure 50 according to Embodiment 3 of the present invention. The present embodiment is characterized in that the artificial tooth 21 on the implant is used for the tooth decay K. The implant is an artificial tooth root, and is fixed to a bone (jaw bone or cheekbone) 23 with a metal fixture 22 such as a titanium alloy. The fixture 22 has a sharp drill shape and is fixed by being screwed into the bone. An abutment 25 that holds the artificial tooth 21 is fixed to the fixture 22. The artificial tooth 21 is firmly fixed in the oral cavity of the patient by the bone 23 / fixture 22 / abutment 25. An occlusal surface is formed on the top 21 t of the artificial tooth 21.

In the present embodiment, the toothed teeth K are formed on the artificial tooth 21 of the implant. Further, the artificial tooth 21 constituting the toothed hook K is not provided with a metal coating. That is, the ring body 11 which is a fitting body is directly fitted to the artificial tooth 21, and the artificial tooth 21 penetrates the ring body 11. The artificial tooth 21 can be molded without being restricted as compared with the remaining tooth. In particular, it is easy to attach a lower taper 21 s to the side peripheral surface of the artificial tooth 21. It is also easy to attach the bottom tapered surface 21k to the root portion.
The ring body 11 is fitted to the root portion of the artificial tooth 21. The artificial tooth 21 has a tapered surface 21 s that extends downward from the top. The taper surface 21s has a taper angle of 1 ° or more and 8 ° or less, but is not extended with the same taper angle at the bottom, and a straight bottom taper 21k is formed at the base. The inner surface 11i of the ring body 11 has a taper corresponding thereto.
The upper taper is not extended as it is, and by providing the straight bottom taper 21k, in cooperation with the ring body 11, the stress is more concentrated on the root of the toothed hook K. To be able to. As long as the taper at the bottom is smaller than the taper angle of the upper tapered surface 21 s (a taper that stands up), it may not be straight (at an inclination angle of 0 °).
With implants, there is a high risk of periodontal disease, and when a large moment is applied to the root, such diseases are promoted. As shown in FIG. 13, the moment at the artificial tooth roots 25, 22, and 23 can be limited to be small by raising the slope of the tapered surface of the side peripheral surface of the artificial tooth 21 at the bottom. As a result, diseases such as periodontal disease can be prevented while the artificial tooth 21 in the implant is used for the tooth decay K.

  Above all, the implant can increase the degree of freedom of placement of the dental caries in the oral cavity. For example, even in the case of a total tooth loss (14 tooth loss), a single denture artificial tooth is provided without using a full denture, and this is used as a toothed tooth K to form a partial denture mounting structure. Can do. In this case, the partial denture is, of course, a partial denture with 13 missing teeth. By using the artificial tooth 21 of such only one implant for the toothed tooth K, it is possible to enjoy the taste of food by performing a stable bite without suffering from the disadvantages associated with total dentures. A denture can be obtained.

(Modification of Embodiment 3)
FIG. 14 is a cross-sectional view of a partial denture mounting structure 50 according to a modification of the third embodiment, and is one example of the present invention. According to FIG. 14, the point that the implant is used for the tooth decay K is the same as the example shown in FIG. 13, except that the artificial tooth 21 constituting the tooth decay K is provided with a metal coating 31. To do. That is, the side peripheral surface of the artificial tooth 21 is covered with the metal covering 31, and the cylindrical fitting body 11 is fitted to the toothed teeth. The metal covering 31 constituting the toothed teeth is formed with a tapered surface 31s extending downward from the top. The taper surface 31s has a taper angle of 1 ° or more and 8 ° or less, but is not extended with the same taper angle at the root portion, and a straight bottom taper 31k is formed at the root portion. The upper taper is not extended as it is, and by providing the straight bottom taper 31k, the stress can be more concentrated on the root portion of the toothed hook K.
As a result, the moments in the artificial tooth roots 25, 22, and 23 can be limited to be small. As a result, diseases such as periodontal disease can be prevented while the artificial tooth 21 in the implant is used for the tooth decay K.

(Embodiment 4)
FIG. 15 is a perspective view of a partial denture mounting structure 50 according to Embodiment 4 of the present invention. In FIG. 15, the upper jaw of the patient wearing the partial denture 10 is shown on the plaster model M. The feature of this embodiment is that one tooth is a toothed tooth K. FIG. 16 is a view showing a state in which the one remaining tooth is covered with a metal coating 31 to form a toothed tooth K. FIG. In FIG. 15, the ring body 11 is fitted to the single toothed hook K.
As shown in the cross-sectional view of FIG. 17, the metal covering 31 is formed with a tapered surface 31s having a taper angle of 1 ° or more and 8 ° or less from the upper portion as described above. The taper angle is not extended by the taper angle, and the taper angle becomes smaller or a taper surface 31k having a straight taper angle is formed. The upper tapered surface 31 s is not extended as it is, and by providing a small taper angle or a straight bottom tapered surface 31 k, the fitting body is made more reliable in cooperation with the ring body 11. Stress can be concentrated on the root portion of the toothed hook 31. As a result, it becomes possible to further reduce the burden on the toothed teeth K or the teeth 5. In FIG. 17, the metal covering 31 that is the toothed covering is formed of white ceramic 31f at the top 31t. However, it is needless to say that there is no such white ceramics and only the metal covering 31 may be used.

  In the case of a single remaining tooth, the partial denture tends to move, and if stress is applied laterally to the upper part of the toothed hook K, the moment at the tooth root increases, and the toothed tooth K There is a tendency to increase the burden. However, it is difficult to apply stress to the upper part of the remaining teeth or toothed teeth K, and a ring body and a taper configuration (taper that has two lower stages) that makes it easy to apply stress to the root part, one remaining tooth or The burden on the tooth decay is reduced, and a partial denture mounting structure with excellent durability can be obtained.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

According to the present invention, a partial denture mounting structure that is highly durable, can be easily adjusted, and does not require special dental intuition and skill in production while reducing the burden on the tooth decay. Etc. can be obtained. In particular, by applying a ring body having a height of less than 4 mm to the part corresponding to the outer crown in the cornus telescope partial denture, stress is applied only to the root portion of the tooth decay. For this reason, the moment around a tooth root can be reduced and the burden of a tooth can be reduced greatly. In addition, the shape of the toothed teeth and the cylinder (corresponding to the outer crown) is geometric and does not require much fine adjustment. The taper of the outer surface of the toothed hook can be formed with high accuracy at a technical laboratory using a dedicated taper forming device (milling machine). Furthermore, since the meshing adjustment can be performed on the toothed hook regardless of the fitting body (corresponding to the outer crown), the meshing adjustment can be easily performed. For this reason, it is possible to clearly understand the entire manufacturing including the meshing adjustment. In a special case, it can be used without removing the nerve of the living tooth for the tooth that becomes the tooth decay, which can contribute to the improvement of the durability.
The point to be noted is in one manufacturing method. In this manufacturing method, (1) using a ring body having a low height as a fitting body, (2) forming a denture base with a heat polymerization resin, and using a unique handling method such as blanching, shortening and simplifying However, the manufacturing method which can be made epoch-making can be acquired. According to this manufacturing method, a great burden reduction can be obtained in any of patients, dentists, and technical laboratories.
In particular, when the number of remaining teeth is one (13 missing teeth), the difficulty can be solved by the partial denture of the present invention. Further, even in a case where a full denture is formed, a partial denture having an excellent wearing feeling can be provided by using one implant as a foothold and using the one implant as a tooth decay.
From these, it is expected to make a significant contribution to the field of partial dentures.

  5 Tooth that becomes a tooth, 5b Tooth root, 5s Tooth side surface, 5t Tooth top, 8 Jaw ridge, 11 Fitting body (ring body), 11b Bottom end of ring body, 16 Artificial teeth, 21 Artificial tooth of implant, 22 Implant Fixtures, 23 bones (maxillary or mandibular), 25 abutments, 31 tooth decay or metal coating, 31s (upper) tapered surface, 31k lower surface, 31t apex (top surface) of dental caries, 35 denture base , 35b Back surface of denture base, 50 partial denture mounting structure, K toothed tooth.

Claims (17)

A partial denture mounting structure comprising an artificial tooth, a denture base that holds the artificial tooth, and a fitting body that is fixed to the denture base and is fitted to a tooth,
The fitting structure for a partial denture, wherein the fitting body has a ring shape with a height of less than 4 mm, and the ring-like fitting body is fitted to a root portion of the toothed tooth.   The denture base of the partial denture covers the outer peripheral side of the ring-shaped fitting body, and covers the side peripheral surface of the toothed tooth on the top side from the portion where the ring-shaped fitting body is fitted. The partial denture mounting structure according to claim 1.   3. The partial denture according to claim 1, wherein a convex portion is provided on an outer peripheral surface of the ring-shaped fitting body, and the periphery of the denture base is surrounded and fixed to the denture base. Mounting structure.   The tooth decay is formed on a remaining tooth or an artificial tooth on an implant (artificial tooth root), and the artificial tooth on the remaining tooth or the implant covers only the periphery of the side surface or the entire surface including the top. The mounting structure for a partial denture according to any one of claims 1 to 3, wherein:   The remaining tooth in which the tooth decay is formed is a deactivated tooth without nerves, and a tooth covering covering the entire surface including the top of the inactivated tooth is provided, or only around the side surface of the inactivated tooth The mounting structure for a partial denture according to claim 4, wherein a toothed tooth covering is provided.   The partial denture according to claim 4, wherein the remaining tooth on which the tooth decay is formed is a vital tooth having a nerve, and a tooth decay covering covering only the periphery of the side surface of the vital tooth is provided. Mounting structure.   The tooth decay is obtained by processing an artificial tooth on an implant (artificial tooth root), does not have a tooth covering, and the fitting body is fitted to the artificial tooth of the implant. The attachment structure of the partial denture of any one of Claims 1-3.   The tooth cover or the artificial tooth of the implant in the tooth is provided with a taper angle in a range of 1 ° to 8 ° so as to spread downward from at least the upper part to the middle part of the outer surface. The partial denture mounting structure according to any one of claims 1 to 7.   The taper angle of the tooth cover is such that (2) the taper angle is small, and (3) straight (no taper angle) at the root part of the tooth decay ((1) the upper taper angle remains the same) The partial denture mounting structure according to claim 8, wherein the mounting structure is a partial denture.   The mounting structure for a partial denture according to any one of claims 1 to 9, wherein the top portion of the toothed teeth exposed from the ring-shaped fitting body is adjusted for meshing.   The mounting structure for a partial denture according to any one of claims 1 to 10, wherein ceramic or resin is disposed at least in an exposed portion of the tooth cover of the tooth decay.   12. The device according to claim 1, wherein the number of the toothed teeth is only one, and the ring-shaped fitting body is fitted to the one toothed tooth. Mounting structure for partial dentures. A partial denture comprising an artificial tooth, a denture base holding the artificial tooth, and a fitting body fixed to the denture base,
The fitting body has a ring shape with a height of less than 4 mm, and is fitted into a root portion of a toothed tooth.   The denture base of the partial denture covers the outer peripheral side of the ring-shaped fitting body and covers the side peripheral surface of the toothed tooth on the top side from the portion where the ring-shaped fitting body is fitted. The partial denture according to claim 13.   The partial denture according to claim 13 or 14, wherein a convex portion is provided on an outer peripheral surface of the ring-shaped fitting body, and a periphery is surrounded by the denture base and is fixed to the denture base.   The inner peripheral surface of the ring-shaped fitting body is characterized by comprising a single step of a lower tapered surface, or two steps of a lower tapered surface where the lower taper surface stands above the upper step, The partial denture of any one of Claims 13-15. A method of manufacturing a partial denture mounting structure comprising: an artificial tooth; a denture base formed of a heat-polymerized resin that holds the artificial tooth; and a fitting body that is fixed to the denture base and fitted into a tooth. ,
Forming a dental carcass covering the patient's caries original body to form the caries;
A step of forming a ring-shaped fitting body having a height of less than 4 mm for fitting to the toothed teeth;
In the patient's oral cavity, fixing the dental caries covering to the caries body,
A step of fitting the ring-shaped fitting body to a tooth formed by covering the toothed tooth covering;
Applying a rebase material to a hole location where the fitting body is to be fixed in a denture base that holds the artificial tooth, and pouring the applied hole location into hot water at 75 ° C. or higher;
Pushing the denture base with artificial teeth and allowing it to stand still for a predetermined time so that the toothed teeth penetrates the hole where the application is made and the fitting body is embedded in the denture base;
And a step of detaching the denture base from the tooth decay while fixing the ring-shaped fitting body to the denture base after being stationary for the predetermined time. Production method.

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