JP3403183B2 - Fixing structure of partial denture and its manufacturing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a partial denture fixing structure and a manufacturing method thereof.

[0002]

2. Description of the Related Art Generally, a partial denture fixing structure is manufactured by a metal wire (clasp wire) or a cast clasp as described in JP-A-61-185263. Therefore, it is used only for the crown part.

[0003]

As described above, since the conventional fixing structure uses the metal holding angle (one), it has strength, but since the metal fittings can be seen from the outside, it does not look good and is attached to a natural tooth. There is a resistance to it.

[0004] Further, since the metal-made sandwiching angle has a structure in which the crown portion is sandwiched from the outside and the inside, when the gingiva portion is sandwiched, it cannot be applied. Furthermore, there is a risk of accidentally puncturing the gingiva and gums when inserting and removing the partial denture into and out of the oral cavity.

When there are partial dentures on both sides of the natural tooth, both the partial dentures are connected by a connecting means called a metal bar, a rod or a connector, or the partial dentures are connected on the opposite side by natural means. Although it is connected and fixed to the teeth, there are some patients who feel uncomfortable or have metal allergies because it is much larger than the holding angle. Moreover, in the case of Co or Ni, some patients may feel an unpleasant taste. As a result, some patients have abandoned their use and are unable to wear partial dentures, resulting in disability. Metal also has a problem that it takes a long time to polish it, resulting in high cost of the product.

Further, not only partial dentures and full dentures, but if the part of the alveolar ridge that is in contact with the gingiva after tooth extraction is hard, it is disliked to wear due to pain and discomfort, so a soft material that does not irritate the gingiva should be used. desired.

Generally, a denture base is manufactured by pressure-polymerizing acrylic resin, but if it is made thin, its strength is unreasonable, and if it is not handled properly, it has the drawback of being deformed or broken. .

[0008] The technical problem of the present invention is to realize a denture which can solve such problems all at once. That is, dentures that look bad and do not use metals that cause metal allergies, can be more reliably and stably fixed by using an inconspicuous transparent plastic material, are lightweight and are not bulky, and can also reduce irritation to the gums. To realize the fixed structure and its manufacturing method.

[0009]

The technical problem of the present invention is solved by the following means. Claim 1, the partial denture to a structure for fixing in the oral cavity, which is fixed to the denture base that secures the artificial tooth has a pair of inner and outer clamping angle of teeth, at least the outer of which Is a fixing structure for a partial denture in which the holding angle is made of transparent plastic and is shaped to contact the outer surface of the crown portion of the natural tooth.

In this way, in the case of the conventional metal clasp, since at least the outer holding angle of the pair of inner and outer holding angles of the dentition fixed to the denture base is made of transparent plastic. Unlike, it is hard to stand out. As a result, it can be mounted without resistance.

Further, since the transparent holding angle made of plastic is in contact with the outer surface of the crown portion of the natural tooth, the partial denture can be reliably fixed as long as the natural tooth is strong.

A second aspect of the present invention is a partial denture fixed in the oral cavity, which is supported by a denture base fixing an artificial tooth .
Has a pair of inner and outer clamping means of teeth, the portion has a concave surface composed of at least the outside of the holding means Gapu plastic of which, moreover encapsulating the outer convex surface of the crown portion of the natural tooth It is a denture.

The outer side surface of the tooth often bulges like a drum, but as described in claim 2, the outer side of the tooth row is clamped.
It consists Gapu plastic, and since the outer convex surface of the crown portion of a natural tooth has a concave surface encapsulating the outer convex surface of the natural tooth is fitted into the concave surface of the clamping means. As a result, the partial denture can be more reliably and stably fixed using the natural tooth. Moreover, since it also has a function of preventing the partial denture from moving vertically with respect to the natural tooth, it can also serve as a rest for preventing the partial denture from sinking.

A third aspect of the present invention is a structure for fixing a partial denture in the oral cavity, which has a pair of inner and outer pinching means of a dentition fixed to a denture base fixing an artificial tooth. Is a fixing structure for a partial denture in which at least the outer clamping means is made of transparent plastic, and is shaped so as to abut at least the outer surface of the gingiva of the natural tooth.

In this way, in the case of the conventional metal clasp, since at least the outer gingival cover of the pair of inner and outer clamping means of the dentition fixed to the denture base is made of transparent plastic. Unlike, it is not conspicuous and can be worn without resistance.

Further, since the transparent gingival cover made of plastic is in contact with the outer surface of the gingiva or the natural tooth, if it is inconvenient to fix the gingiva to the natural tooth, the gingiva should be used to ensure the use. Can fix partial dentures.

According to a fourth aspect of the present invention, there is provided a structure for fixing a partial denture in the oral cavity, wherein the denture base fixing the artificial tooth has a pair of sandwiching means inside and outside the dentition . at least the outer clamping means are extending from the denture base itself, yet abut against the outer surface of the gingiva so that it can sandwich the gingiva natural teeth of which
It is a structure for fixing partial dentures, which has a surface shape for covering .

[0018] In this way, the outside of the gum cover, it is extended from the denture base itself. As a result, since the gingival cover is made of the same material as the denture base and has the same color, unlike the conventional metal clasp, it is less noticeable and can be attached without resistance.

[0019] Moreover, denture and gingiva cover of the same color in the same material is in contact on the outer surface of the gingiva natural teeth have a cover faces shaped <br/> shape, for clamping the gingival, natural tooth When it is inconvenient to fix the partial denture, it is possible to securely fix the partial denture by sandwiching the gingiva.

Further, as described above, the holding angle, the gingival cover,
Since the denture base is made of plastic and is elastic and flexible, it does not undergo permanent deformation like a conventional metal clasp when attaching and detaching a partial denture, and can withstand repeated attachment and detachment for a long period of time. . Moreover, since it is made of plastic and light, the burden on the user is light and unlike the metal clasp, there is no danger of piercing the meat in the mouth.

A fifth aspect of the present invention is a partial denture in which the sandwiching means according to the first, second, third or fourth aspect has a length that spans a plurality of adjacent natural teeth. .

As described above, since the sandwiching means such as the sandwiching angle and the gingival cover has a length that spans a plurality of adjacent natural teeth, the partial denture is fixed by using two or more natural teeth. it can. As a result, it can be more reliably and stably fixed as compared with the case of fixing to one natural tooth.

According to a sixth aspect of the present invention, the denture base according to any one of the first to fifth aspects is supported on an occlusal surface of an adjacent natural tooth together with a holding means such as a holding angle and a gingival cover. It is a partial denture with a transparent rest formed. In the case of a structure having a rest that supports the occlusal surface of the adjacent natural teeth, as in claim 6, the denture base has a structure in which a transparent rest is formed together with a holding means such as a holding angle or a gingival cover. Then, it is possible to prevent the partial denture from settling down, and since it is transparent, it is inconspicuous.

A seventh aspect of the present invention is that partial dentures on both sides of a natural tooth are
Connecting bar, a partial denture formed by a transparent thermoplastic. Thus, the bar connecting parts denture each other on both sides of the natural tooth is formed of a transparent thermoplastic, inconspicuous as in the case of the metal, yet does not use metal, as well as lighter ,
It does not cause metal allergies.

[0025] Claim 8 is baseplate of defects alveolar ridge portions denture is formed by a thermoplastic plastic, a moiety denture deer have also been molded in pressed <br/> lifting means or rest integral . When a sandwiching means such as a sandwiching angle is later integrated with the foundation floor of the partial denture deficient jaw ridge, that portion swells or becomes bulky, which is unnatural and uncomfortable, but according to claim 8, If it is integrally molded with the foundation floor from the beginning, the outer dimensions can be almost the same as those of natural teeth, and it is lightweight and comfortable to use.

According to a ninth aspect of the present invention, there is provided a pair of inner and outer sandwiching angles of the dentition and a gingival cover, which are fixed to the denture base to which the artificial tooth is fixed. It is made of transparent plastic and the gum gum
The outer surface of the gingiva so that the bar can clamp the gingiva of the natural tooth
A method of manufacturing a fixing structure for a partial denture , which has a surface shape that abuts against and covers the denture base, wherein the clamping angle and the extension portion protruding from the gingival cover are embedded when the denture base is manufactured. It is a method for manufacturing a partial denture, which is characterized by being integrated.

As described above, when the denture base is manufactured, the extension portion projecting from the sandwiching means is embedded and integrated in the denture base, so that the transparent and plastic outer sandwiching means can be easily and robustly formed. Can be integrated with the denture base.

According to a tenth aspect of the present invention, there is provided a pair of inner and outer sandwiching angles of the dentition and a gingival cover, which are fixed to the denture base to which the artificial tooth is fixed. Made of transparent plastic, and the gums
The outside of the gingiva so that the cover can clamp the gingiva of the natural tooth
A method for manufacturing a fixing structure for a partial denture , which has a surface shape that abuts against a surface and covers it, and an extension portion protruding from the holding angle and the gingival cover is bonded to the denture base manufactured earlier. Alternatively, it is a method for manufacturing a partial denture, which is characterized in that it is detachably integrated.

As described above, according to the method of adhering the extension portion protruding from the sandwiching means to the previously manufactured denture base so as to be integrated, the extension portion can also be integrated so that it can be integrated, so that it is transparent and plastic. The outer clamping means can be easily and robustly integrated with the denture base. Further, in the case of the detachable type, when the clamping means or the like is damaged, the clamping means can be separated from the denture base and only the clamping means can be replaced or repaired.

As described above, the thermoplastic used in the present invention is more elastic than conventional acrylic resins, has a high strength, and is not easily broken, so that it is used in the base part of the denture base. In this case, the wall thickness can be reduced.

Further, since the sandwiching means and the part of the foundation floor are transparent, the dentures are not conspicuous and are aesthetically excellent, and the dentures can be used without resistance without the unpleasant taste of metal.

[0034]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of how the fixing structure for partial denture and the manufacturing method thereof according to the present invention are practically embodied will be described. FIG. 1 is a side view (buccal side view) viewed from the outside, which is a first embodiment of a partial denture fixing structure according to the present invention. FIG. 2 is a plan view (occlusal surface view) taken along the line AA in FIG. 1.

In the figure, n1, n2 and n3 are natural teeth. f1 and f2 are artificial teeth, and d is the denture base. That is, the artificial teeth f1 and f2 and the denture base d form a partial denture.

Reference numerals 1 and 2 are the holding angles, and 1 is the outer side (cheek side).
2 is an inside (lingual side) holding angle. Both the outer sandwiching angle 1 and the inner sandwiching angle 2 are integrated with the denture base d and are held by the denture base d.

That is, both the extension portion 1a extending from the outer holding angle 1 and the extension portion 2a extending from the inner holding angle 2 are integrated with the denture base d.

The denture base d is usually made of acrylic resin,
It has a bright reddish purple color like the gingiva 3. On the other hand, the holding angles 1 and 2 and the extension portions 1a and 2a are made of a transparent synthetic resin resin material.

The holding angles 1 and 2 are formed so as to be held from both inside and outside of the root of the natural tooth n1 almost like the conventional clasp. Moreover, in the state where the partial denture is mounted in the oral cavity and the natural tooth n1 is sandwiched at the sandwiching angles 1 and 2,
A suitable shape is such that the sandwiching angles 1 and 2 are elastic enough to press the roots of the natural teeth n1.

Therefore, in the state where the partial denture is installed in the oral cavity, the natural teeth n are held at the inner and outer holding angles 1 and 2 as shown in the figure.
The partial denture is held and fixed to the natural tooth n1 by sandwiching the thin portion of the root of the tooth 1 from both inside and outside with some elasticity. That is, since the root portion of the natural tooth n1 is thin, it is blocked by the bulging portion on the upper side and cannot be separated on the upper side. I cannot move to the lower side because I have gums on the lower side. Further, since the natural tooth n1 has a shape in which the center is swollen, the denture base d is also fixed in the horizontal direction by making the inner and outer sandwiching angles 1 and 2 also have such a shape. It

Since the holding angles 1 and 2 are made of plastic, they are highly elastic. Therefore, when the holding angles 1 and 2 of the partial denture are attached to and detached from the natural tooth n1, even if the holding angles 1 and 2 are opened, the original state is reliably restored. As a result, it is possible to prevent the fixing force for the natural tooth n1 from decreasing even after being repeatedly attached to and detached from the oral cavity for many years.

The holding angles 1 and 2 are not transparent, and various colored or semi-transparent materials can be used so as to correspond to a patient who desires coloring. Further, the inner holding angle 2 which is difficult to see from the outside can be a metal clasp as in the conventional case.

FIG. 5 is a cross-sectional view at the position of the natural tooth n1. (1) FIG. 5 shows an example in which both the inner and outer sandwiching angles 1 and 2 are transparent, and (2) shows the outer sandwiching angle 1 being transparent. An inner holding angle of 2 m in the body is an example of a metal clasp.

Since the elasticity of the plastic can be easily adjusted, a soft touch that does not cause pain even when pressed against the gingiva is possible. FIG. 3 is an example of holding and fixing a partial denture using gingiva rather than natural teeth, and is a side view (buccal side view) viewed from the outside. FIG. 4 is a BB plan view (occlusal view) thereof.

The gingival covers 4 and 5 having a relatively wider surface than the sandwiching angles 1 and 2 are made of a plastic material having a high elasticity, and the portions 4a and 5a extended toward the denture base d side.
Is integrated with the denture base d.

Therefore, when the partial denture is mounted in the oral cavity, the gingival covers 4 and 5 integrated with the denture base d are pressed against the gingiva of the natural tooth n1 adjacent to the artificial tooth f2 with a wide surface. In this manner, since the wide surfaces of the gingival covers 4 and 5 are pressed against the gingiva with a soft touch, the partial denture can be held and fixed to the gingiva without feeling pain in the gingiva.

In the case of holding and fixing using the gingiva, it is important to make use of the soft elasticity of the gingival covers 4 and 5. Therefore, unlike the case of the holding angle, the inner gingival cover 5 is also preferably made of plastic. There is. Also in this case, the gum cover 4,
5 can be colored or translucent.

However, the gingiva covers 4 and 5 are also preferably the same color as the denture base d, that is, the same color as the gingiva 3, because the gingiva covers 4 and 5 are superposed and supported on the gingiva.

In the above embodiment, the extension angles 1a, 2a, 4a and 5a from the holding angles 1 and 2 and the gingival covers 4 and 5 are used.
In order to integrate the denture base d with the denture base d, there are a method of insert-molding the extensions 1a, 2a, 4a, 5a inside the denture base d and a method of adhering the extensions 1a, 2a, 4a, 5a when molding the denture base d.

For insert molding, when the gingiva part of the artificial teeth f1, f2 is insert-molded on the denture base plate d, the extension parts 1a, 2a, 4a, 5a are simultaneously insert-molded.

In the case of gluing, the gluing surface of the denture base d molded beforehand is ground. That is, the extension portions 1a, 2a, 4
Make sure that parts a and 5a are protruding, and that you don't feel uncomfortable.
The recesses are formed by cutting the extension portions 1a, 2a, 4a, 5a by the thickness and the adhesion amount. If possible, it may be formed during molding of the denture base d.

In the recess thus formed, the extension portions 1a, 2
When a, 4a, and 5a are fitted and adhered, they are integrated with the denture base d, and the outer surfaces of the extension portions 1a, 2a, 4a, and 5a and the outer surface of the denture base d can be flush with each other.

When the extensions 1a, 2a, 4a, 5a are colored, it is natural to consider the harmony with the color of the denture base d. Therefore, the gingival cover 4 of the same color as the denture base d,
When 5 is used, the bonded portion is less noticeable.

As shown in FIGS. 5 (3) and 5 (4), the sandwiching angle 2 can be used on the inside of the natural tooth n1 instead of the gingival cover 5. That is, the holding angle 2 in FIGS. 1 and 2 is used for the inner root of the natural tooth n1.

When fixing with the gingival cover as described above,
As shown in FIG. 5C, both the outer gingival cover 4, the inner holding angle 2 and the gingival cover 5 can be made of transparent plastic. Further, as shown in FIG. 5 (4), the outer gingival cover 4
Only the transparent plastic may be used, and the inner clamping angle 2m may be a metal clasp similar to the conventional one.

FIG. 6 shows an embodiment in which the gingival covers 4 and 5 cover the gingiva and the crown portion. (1) As shown in the figure, the gingival covers 4 and 5 on both the inner and outer sides may cover both the gingiva 3 and the natural tooth n1.
The structure may be such that only the outer gingival cover 4 as in (2) or only the inner gingival cover 5 as in (3) covers the gingiva 3 and the natural tooth n1. Also in this case, the inner holding angle 2 and the gingival cover 5 may be made of metal.

When both the inner and outer gingival covers 4 and 5 are made of the same material, the extension portions 4a and 5a may be previously integrated as shown in FIG.

FIG. 7 shows an embodiment in which the gingival covers 4 and 5 are formed by the denture base d itself. In FIGS. 3 and 4, the gingival covers 4 and 5 which are separate bodies are integrated with the denture base d, whereas in FIG. 7, the denture base d is extended to above the gingiva of the natural tooth n1. Then, as in the case of the gingival covers 4 and 5, the elastic force of the extended gingival covers 4d and 5d is pressed onto the gingiva 3 of the natural tooth n1.

In this case, the material of the denture base d is a problem, and it is suitable as the denture base d, and the gingival cover 4,
As with item 5, select a material that can be pressed against the gingiva with a soft touch. For example, a polycarbonate resin or a vinyl resin processed material is suitable.

FIG. 8 is a view showing an embodiment using a holding means having a concave curved surface. (1) As shown in the figure, the outer surface of most of the natural teeth n is a convex or drum-shaped curved surface 6. In the case of front teeth, the inside may be dented,
The inside is also swollen except for the front teeth.

Therefore, as shown in (2), the holding means 7
If the shape is such that it has a concave curved surface 8 that exactly covers the convex curved surface 6, it becomes difficult for the holding means 7 to move upward or downward with respect to the natural tooth n. Convex curved surface 6
Is fitted into the concave curved surface of the holding means 7, and therefore acts as a catch.

If the inner side 6i of the illustrated natural tooth n is recessed, it is preferable to form the convex surface 8i so that the inner holding surface of the holding means 7i fits into the recess 6i.

A horizontal sectional view of the position of the convex curved surface 6 of the natural tooth n is shown in (3). As is clear from this figure, the natural teeth n
As for the shape of the horizontal section, the central portion is also swollen, so that the concave curved surface 8 can be reliably fixed in the horizontal direction by forming the concave curved surface 8 in the horizontal direction.

The sandwiching angle 1 and the gingival cover 4 are structured to be fixed to only one adjacent natural tooth n1, but in the case of (3), two adjacent natural teeth n1, n
It is fixed by using 2. That is, the inner and outer sandwiching means 7 are extended to the second natural tooth n2 to form a continuous sandwiching means.

Since a plurality of natural teeth are used for fixing in this way, the partial denture can be fixed stably and more firmly. Further, as in (2), since it also has a function of preventing the partial denture from moving in the vertical direction with respect to the natural tooth n, it can also serve as a rest for preventing the partial denture from sinking. In this case also, at least the outer sandwiching means 7
Is made of transparent plastic so that it is not conspicuous.

Further, on the same principle as that of the gingival cover of FIGS. 3 and 4, as shown in (4), the inner and outer concave curved surface-shaped holding means 7,
7 may be extended downward, and the gingiva of the gum may also be clamped by the extension portions 7a, 7a.

As for the holding means 7 having the concave curved surface 8 and the double-shaped holding means 7, the extension portion is embedded or adhered to the denture base in the same manner as the holding angle and the gingival cover shown in FIGS. You can also

FIG. 9 is a plan view showing a method of manufacturing a fixing structure for a partial denture in the order of steps. (1) is a model of the dentition on the upper jaw side, which is molded based on a mold taken from a patient. Then, assuming that n1, n2, n3 ... Are natural teeth remaining in the patient, a case of forming a concave curved surface clamping means for clamping two natural teeth n1, n2 will be described. In this case, two natural teeth n1 and n2 and a defective ridge (F1,
Place one transparent thermoplastic sheet 9 over F2). The thickness of this sheet 9 is arbitrary. It should be noted that F1 and F2 are the traces of the tooth extracted from the natural tooth in the defect ridge.

In each of the figures (1) ... (4), A of the natural tooth n1 is shown.
The cross-sectional views at the -A position and the BB position of the defect ridge (F1) are also shown.

Next, the model and the sheet 9 are set in a molding apparatus, and, under the condition that heat of about 100 to 150 ° C. is applied, for example, pressurized air is applied from above the sheet 9 or a vacuum is applied from below the model. When sucked, the sheet 9 is thermally softened, and the sheet 9 in (2) is
Like a, it adheres to the entire surfaces such as the upper surfaces and side surfaces of the natural teeth n1 and n2, and also to the upper surfaces and side surfaces of the defective ridge (F1, F2) of the model.

In this state, if it is taken out from the molding apparatus and the excess portion is cut and removed, it becomes as shown in (3). That is, the inner and outer concave curved surface-shaped holding means 7, 7
And the rest part 10 remain, and the defect ridge (F1, F)
The part which becomes the foundation floor 11 remains above 2). Next, (3)
As shown in FIG.
2) A portion d corresponding to a denture base, that is, a gum, is formed on the upper base plate 11 by overlapping. This denture base is formed using a resin such as an acrylic resin or a polycarbonate resin. Naturally, a resin colored pink is used so as to have the same color as the natural gums.

[0072] Next Ide, as in (4), on the denture d, when fixing the artificial tooth f1, f2, partial denture is completed. Inner / outer clamping means 7, 7, foundation floor 11 and rest 10
The part of is transparent. The thus completed partial denture is removed from the model, the natural teeth n1 and n2 of the patient are sandwiched by the inner and outer clamping means 7 and 7, and the rest 10 is attached so as to be hooked on the occlusal surface of the natural tooth n1 of the patient.

In this embodiment, the foundation floor 11 has a single layer, but it may have a two-layer structure. That is, using a transparent sheet that is softer in material than the base floor 11 and does not stimulate the ridge gum of the patient after tooth extraction,
(1) The clamping means and the foundation floor are molded by the method of (2). In this way, after forming a soft sheet, cover the thermoplastic sheet 9 as described above,
(1) The clamping means and the foundation floor are molded by the method of (2).

Thereafter, as in (3) and (4), unnecessary portions are removed, a denture base d is formed, and artificial teeth f1 and f2 are fixed thereon. As described above, since the portion of the base of the partial denture that is in contact with the gingiva of the patient's ridge is made of a soft material, it is less irritating to the patient and can be worn without resistance. If there is a sheet that has a two-layer structure of a transparent and elastic thermoplastic and a transparent and soft resin from the beginning, molding with a two-layer structure will result in steps (1) and (2). To be simplified.

When it is desired to make the base bed 11 the same color as the gum like the denture base d, it is preferable to use a sheet in which only half is transparent and the other half is colored gum. The sandwiching angle and the gingival cover shown in FIGS. 1 to 4 can also be manufactured by the method shown in FIG.

The manufacturing method of FIG. 9 can be applied to a partial denture having a bar structure and a complete denture. FIG. 10 shows a partial denture having a bar structure, in which the partial dentures are arranged on both sides of the natural teeth n1 to n6. In the case of such a bar structure, the bar 12 is conventionally made of metal, but in the case of the present invention, it is made of a transparent thin plate.

Both ends 12a, 12b of the bar 12 of the transparent plate made of this thermoplastic may be embedded in the denture bases d1, d2 of the left and right partial dentures as in the case of FIGS. 1 to 4, or both ends 12a. , 12b on the denture base d1,
You may overlap and adhere d2.

However, according to the manufacturing method of FIG. 9, when the base plates of the left and right partial dentures are first formed from the thermoplastic sheet, the bar portion 12 is also formed together. That is, the left and right foundation plates of the partial denture and the bar portion 12
With large sheets such as to cover the <br/> pressure or by vacuum suction as, after molding, removal of excess area, the bar portion 12 and the inner and outer clamping means 7, 7, The areas of the left and right foundation floors 11 remain.

Next, as in the case of FIG. 9, denture bases d1 and d2 are formed on the left and right base beds 11, 11 and artificial teeth f1, f2, ... The bar portion 12 at the time of forming the base bed 11 functions as a bar connecting the completed left and right partial denture bases d1 and d2. However, since the bar portion 12 is implemented according to the patient's request, it is sufficient to separately manufacture the left and right denture bases d1 and d2 by the manufacturing method of FIG. 9 and mount them separately. The reason for this is that the sandwiching means 7, 7 inside and outside the respective partial dentures can sufficiently fix the partial dentures.

In FIG. 10, since the denture base d is formed on the entire surface of the base floor 11, the base floor 11 is almost invisible, but in FIGS. 8 and 9 and the next FIG. Since the denture base d is formed smaller, the outer periphery of the base plate 11 is partially exposed from the outer periphery of the denture base d. Which one is adopted is free.

The manufacturing method of the present invention is also suitable for a complete denture. That is, in the model of FIG. 11 (1), the model shown in FIG.
In the same manner as in (1), a large sheet 9 made of a transparent and highly elastic thermoplastic is overlaid, and pressurized or vacuum sucked while heating, and the base floor 1 as shown in (2).
1 is formed and unnecessary portions are removed, then a denture base d of the same color as the gum is formed on the base bed 11, and finally human teeth f1, f2 ...
Is fixed on the base floor d, a complete denture as shown in FIG. 11 (2) is completed. The base plate 11 of the complete denture is fitted and attached to the alveolar ridge after the patient's tooth extraction.

The illustrated example uses a sheet 9 having a two-layer structure in which a transparent and elastic thermoplastic layer 92 is laminated on a transparent and soft resin layer 91 from the beginning, but in this case as well. , As described in FIGS. 9 (1) and 9 (2),
It is also possible to mold with a soft resin layer 91 and then laminate and mold the thermoplastic layer 92 thereon.

That is, first, the transparent and soft sheet 91 is overlaid and molded on the whole ridge (F1, F2 ...) After the natural teeth have been lost, and the transparent and elastic thermoplastic sheet 91 is formed thereon. When the base sheet 11 having a two-layer structure is formed by stacking and molding the plastic sheets 92, the base sheet 11 is soft-touched with the ridge and gingiva of the patient, and can be mounted without resistance.

The complete denture of the present invention is rich in elasticity, and since the denture base made of a soft material or the denture base made of a thermoplastic material is in contact with the ridge of the alveolar ridge, , Adhesion to the ridge of the ridge is good, and it is firmly adsorbed and fixed to the ridge by saliva. Therefore, the palate portion 13 can be largely removed as shown in FIG.

Reference numeral 11a denotes a portion extending from the base floor 11, which is a soft resin layer or a thermoplastic resin rich in elasticity. Since this portion also adheres to the palate with saliva, the area may be small. . As a result, the exposed area of the palatal mucosa is enlarged, so that there is no discomfort during wearing and the burden on the patient is reduced. As a result, it is easily accepted by patients who dislike wearing full dentures.

In the case of the two-layer structure, if the reinforcing core material is overlaid on the soft layer and then the transparent layer of thermoplastic resin is overlaid, the pinching means can be prevented from being broken. Further, it is easy to manage the denture by using a soft layer to engrave or fill in the name of the patient and then laminate and mold a transparent thermoplastic layer on the patient's name.

In the case of a sheet having a two-layer structure, or even a single sheet, if a commercially available product containing a core material is available, it may be used.

The thermoplastics used in the present invention include polycarbonate, polystyrene, polyethylene, polyurethane, vinyl chloride and the like.

[0089]

According to the first aspect of the present invention, at least the outer holding angle of the pair of inner and outer holding angles of the dentition, which is fixed to the denture base , is made of transparent plastic. Unlike the case, it is hard to stand out. As a result, it can be mounted without resistance.

Further, since the transparent holding angle made of plastic is in contact with the outer surface of the crown portion of the natural tooth, the partial denture can be reliably fixed as long as the natural tooth is strong.

The outer side surface of the tooth often bulges like a drum, but as in claim 2, the holding means on the outer side of the tooth row.
It consists Gapu plastic, and since the outer convex surface of the crown portion of a natural tooth has a concave surface encapsulating the outer convex surface of the natural tooth is fitted into the concave surface of the clamping means. As a result, the partial denture can be more reliably and stably fixed using the natural tooth. Moreover, since it also has a function of preventing the partial denture from moving vertically with respect to the natural tooth, it can also serve as a rest for preventing the partial denture from sinking.

According to a third aspect, the denture base is fixed ,
Since at least the gingival cover of the pair of inner and outer clamping means of the dentition is made of transparent plastic, unlike the conventional metal clasp, it is less noticeable and can be mounted without resistance.

Further, since the transparent gingival cover made of plastic is in contact with the outer surface of the gingiva or the natural teeth, if it is inconvenient to fix the gingiva or the natural teeth on the gingiva, the gingiva should be used to make sure. Can fix partial dentures.

According to the fourth aspect, the outer gingival cover is
It is extended from the denture base itself. As a result, since the gingival cover is made of the same material as the denture base and has the same color, unlike the conventional metal clasp, it is less noticeable and can be worn without resistance.

[0019] Moreover, denture and gingiva cover of the same color in the same material is in contact on the outer surface of the gingiva natural teeth have a cover faces shaped <br/> shape, for clamping the gingival, natural tooth When it is inconvenient to fix the partial denture, it is possible to securely fix the partial denture by sandwiching the gingiva.

Further, as described above, the holding angle, the gingival cover,
Since the denture base is made of plastic and is elastic and flexible, it does not undergo permanent deformation like a conventional metal clasp when attaching and detaching a partial denture, and can withstand repeated attachment and detachment for a long period of time. . Moreover, since it is made of plastic and light, the burden on the user is light and unlike the metal clasp, there is no danger of piercing the meat in the mouth.

As described in claim 5, since the sandwiching means such as the sandwiching angle and the gingival cover has a length that straddles a plurality of adjacent natural teeth, it is possible to use two or more natural teeth as partial dentures. Can be fixed. As a result, it can be more reliably and stably fixed as compared with the case of fixing to one natural tooth.

In the case of a structure having a rest for supporting the occlusal surfaces of adjacent natural teeth, a denture base is provided with a transparent rest together with a holding means such as a holding angle and a gingival cover. With this structure, it is possible to prevent the partial denture from sinking, and it is transparent so that it is inconspicuous.

When the connector for the partial dentures on both sides of the natural tooth is made of transparent thermoplastic as in claim 7, it is inconspicuous as in the case of metal, and no metal is used. Not only is it light, it does not cause metal allergies.

[0100] When a sandwiching means such as a sandwiching angle is later integrated with the foundation floor of the partial denture deficient jaw ridge, that portion swells or becomes bulky, which is unnatural and uncomfortable.
As described above, if it is integrally molded with the foundation floor from the beginning, the outer dimensions can be almost the same as those of natural teeth, there is no discomfort, and the weight and usability are good.

When the denture base is manufactured as described in claim 9, the extension part projecting from the sandwiching means is embedded and integrated in the denture base so that the transparent sandwiching means made of plastic can be easily used. In addition, it can be firmly and firmly integrated with the denture base.

According to the tenth aspect of the present invention, in the method of adhering the extension part projecting from the sandwiching means to the denture base which has been manufactured previously and adhering it to the denture base, the extension part can also be adhered to the denture base. The transparent and plastic outer clamping means can be easily and robustly integrated with the denture base. Further, in the case of the detachable type, when the clamping means or the like is damaged, the clamping means can be separated from the denture base and only the clamping means can be replaced or repaired.

As described above, the thermoplastic resin used in the present invention is more elastic than the conventionally used acrylic resin, has a high strength, and is not easily broken, so that it is used for the base part of the denture base. In this case, the wall thickness can be reduced. In addition, because it is made of plastic and light, it can be fixed to the ridge of the jaw with stability only by the suction force of saliva.

Further, since the sandwiching means and the base floor are transparent, the dentures are not conspicuous, are aesthetically excellent, do not have the unpleasant taste of metal, and dentures can be used without resistance.

[Brief description of drawings]

FIG. 1 is a side view of a first embodiment of a partial denture fixing structure according to the present invention, as viewed from the outside.

FIG. 2 is a plan view taken along the line AA in FIG.

FIG. 3 is a side view of an example of holding and fixing a partial denture using gingiva, as viewed from the outside.

FIG. 4 is a plan view taken along line BB in FIG.

FIG. 5 is a sectional view at a position of a natural tooth n1.

FIG. 6 is a cross-sectional view of an embodiment of covering the gingiva over the gingiva and the crown portion.

FIG. 7 is an embodiment in which a gingival cover is formed by an extension portion of the denture base itself, (1) is a plan view, and (2) is a side view seen from the outside.

FIG. 8 is a diagram showing an embodiment using a holding means having a concave curved surface shape.

FIG. 9 is a diagram showing a method of manufacturing a partial denture fixing structure in the order of steps.

FIG. 10 is a plan view of a structure in which partial dentures on both sides are connected by a bar.

FIG. 11 is a view showing an embodiment for manufacturing a complete denture by the manufacturing method of the present invention.

[Explanation of symbols]

n1, n2, n3 natural teeth f1, f2 artificial teeth d, d1, d2 denture base 1 Outside clamping angle 1a extension 2 Inside clamping angle 2a extension 3 gingiva 4 gum cover 4a extension 5 gum cover 5a extension 4d, 5d Extension from denture base (gingiva cover) 6 Drum-shaped convex curved surface 7 clamping means 8 concave surface 9 Transparent thermoplastic sheet 10 Rest part Traces of natural teeth on the ridge of the F1 and F2 defects 11 foundation floor 12 bars 12a, 12b Both ends of bar 13 palate

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) A61C 13/26

Claims (10)

(57) [Claims] 1. A partial denture fixed in the oral cavity,
The artificial teeth are fixed to the denture base and have a sandwiching angle as a pair of inner and outer sandwiching means of the dentition , of which at least the outer sandwiching angle is made of transparent plastic and is a natural tooth. A partial denture, which is shaped so as to come into contact with the outer surface of the crown portion. 2. A partial denture fixed in the oral cavity,
Fixed to the denture base that secures the artificial tooth has a pair of inner and outer clamping means of the dentition, consisting of at least the outside of the holding means Gapu plastic of which, moreover outer crown portion of the natural tooth Partial denture, which is a concave curved surface that covers the convex curved surface of. 3. A partial denture fixed in the oral cavity,
It has a pair of clamping means inside and outside the dentition, which is fixed to the denture base fixing the artificial tooth, at least the clamping means on the outside of the dentition is made of transparent plastic, and at least outside the gingiva of the natural tooth. A partial denture having a shape that abuts against a side surface. 4. A partial denture fixed in the oral cavity,
The denture base fixing the artificial tooth has a pair of inner and outer clamping means of the dentition, at least the outer clamping means extending from the denture base itself, and the gingiva of the natural tooth
Portion, characterized in that it is a surface <br/> shape that covers come into contact with the outer surface of the gingiva so that it can be clamped dentures. 5. The sandwiching means has a length that spans a plurality of adjacent natural teeth, and the sandwiching means has a length that spans a plurality of adjacent natural teeth. Partial denture. 6. The denture base is provided with a sandwiching means and a transparent rest for supporting an occlusal surface of an adjacent natural tooth, according to any one of claims 1 to 5. Partial denture described in paragraph. 7. A connecting portion denture each other on either side of a natural tooth
The partial denture according to any one of claims 1 to 6, wherein the bar is made of transparent thermoplastic. 8. baseplate of defects alveolar ridge portions denture is formed by a thermoplastic, yet according claim 1, characterized in that it is molded into clamping means or rest integral with the Item 7. The partial denture according to any one of items 7 to 7. 9. A plastic having a pair of inner and outer clamping angles of a dentition and a gingival cover fixed to a denture base fixing an artificial tooth, of which at least the outer clamping angle and the gingival cover are transparent. And the gingival cover is
Abut on the outer surface of the gingiva so that the gingiva of the natural tooth can be pinched.
A method of manufacturing a fixing structure for a partial denture , which has a surface shape to cover, and embeds and integrates the holding angle and the extension portion protruding from the gingival cover when manufacturing the denture base. A method for producing a partial denture, which is characterized by the following. 10. A plastic having a pair of inner and outer clamping angles of a dentition and a gingival cover fixed to a denture base fixing an artificial tooth, of which at least the outer clamping angle and the gingival cover are transparent. And the gingival cover is
Abut on the outer surface of the gingiva so that the gingiva of the natural tooth can be pinched.
A method for producing a fixing structure for a partial denture , which has a surface shape to be covered, by adhesively or detachably attaching the holding angle and the extension protruding from the gingival cover to the denture base produced earlier. A method for manufacturing a partial denture, characterized by being integrated.