JPS607837A - Metal denture impression floor, method for molding same and flash for performing same - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coined metal denture base, a method for molding the same, and a flask for carrying out the same, and particularly relates to an improvement in the process of molding a coined denture base for using metal adhesive resin as gingiva. .

(Background Art) A coined denture base (simply referred to as a coined base) is an alternative to a cast denture base, which has various defects such as the formation of cavities, a complicated process, and the generation of harmful gases during the process. Although it is very superior in that it has no floor defects and is thin, light, and durable, it has traditionally had some manufacturing difficulties.

The denture l shown in Figure 1 has a resin layer as the gingival part on the metal coining base 2! It is made by gluing together and embedding artificial teeth into it. Since this is an edentulous jaw, the coining base consists of a smooth and gently curved adhesive surface 'S' A and a continuous alveolar part 2B. Although this seal part λB is slightly curved, It is made of a relatively gentle continuous curved surface as a whole, and this is considered to be sufficient, but if the adhesiveness of the metal-adhesive resin is not perfect, wrap the resin layer j all the way to the back surface *j" :v, In addition, by forming protrusions 3 and 4t called maintenance devices along the alveolar crest line A, and embedding resin in a series in those recesses on the back side to increase the adhesive strength, the resin layer j is firmly maintained on the coining bed 2.Furthermore, rather than a simple one with one line, a complex practical technique 6 may be given as shown in the Oko diagram.

Coining beds for edentated jaws can have a complex shape with roughness overall, and the coining beds must be manufactured to fit closely and snugly within the oral cavity, which has traditionally been extremely difficult to manufacture. Met. Furthermore, if a stainless steel plate is used as a substrate material for a coining bed that is intended to have the inherent properties of being thin, light, and durable, manufacturing becomes even more difficult.

For this reason, casting beds have been the mainstream in the past, but the present inventor has developed a series of systems, including a molding method and equipment for carrying out the method, as disclosed in Japanese Patent Application Laid-Open No. 1993-110033. and open the way to press plate production.
It has already received great acclaim.

This molding method involves making a silicone rubber mold from a plaster model, creating a Yin-Yang metal mold from the silicone rubber mold, and preforming the silicone rubber mold and metal mold before molding with the Yin-Yang metal mold. This was the basic idea and led to a breakthrough in coining bed production.

However, after that, the situation changed slightly in two respects, and it became rice. The first is that I became familiar with the work and that the implementation was on track, and I found that the molding method incorporating the above-mentioned preforming was surprisingly superior. Another reason is that the metal-adhesive resin that was developed subsequently was greatly improved as a raw material, and its adhesion properties became very good. Projection 3 shown in
It has been found that it is also possible to omit the protrusion (however, from another point of view, as described later, it is better not to omit the protrusion).

In particular, we will discuss the former aspect in more detail: A model that is the basis for press forming of a zero coining bed (hereinafter referred to as the original model)
is provided by the dentist, on the basis of which the coining bed is manufactured by molding, but at the same time when the finished coining bed is delivered, the original model must be returned to the dentist in its original state. The original model must not be destroyed or even damaged in the slightest. Although it is a matter of course that it is better to use the most accurate original model as the mold for the final press molding, the reason for not doing so is as stated above. The idea of using the original plaster model as a press mold was out of the question and unthinkable.

However, since the coining bed produced through the series of preforming and main forming described above has excellent precision, it is unlikely that the coining bed will be damaged even if the original model is used as a mold for the highly accurate coining bed9. It turns out that it is rice.

Furthermore, in order to achieve accurate molding, it is sufficient to use a substrate as thin as possible, but this poses a problem in terms of strength. In order to increase the strength by using a thinner substrate, it is also desirable to improve the flask of the production tool by eliminating the possibility of damage to the original model in advance. .

(Purpose, Seinari) The first invention provides a method for molding a metal denture coining base, which is characterized in that after preliminary molding using a silicone rubber mold, final molding is performed using a basic model and a silicone rubber mold. The purpose of this is to further improve molding accuracy.

The second invention further achieves the object of the first invention by providing a metal denture coining base characterized by a concave protrusion on the adhesive side extending between the alveolar parts on both sides. Aim to achieve well.

A third invention provides a flask for making a coining bed, characterized in that the flask has a conical hole, and a bottom is provided on the narrow side of the hole, and a bottom plate is fitted into the bottom. The purpose of this invention is to eliminate obstacles to the implementation of the first and second inventions.

;゛〉 (Theory M of a case of actual use) Fig. 3, an og figure, shows a plaster cast 0 on which an impression was taken at the dentist's office. Although this is shown for the edentulous maxilla, the following explanations still apply to the edentated one. In these figures, 10 is a part that corresponds to the alveolar region (hereinafter referred to as the alveolar part), and 2 is a part corresponding to the palate (hereinafter referred to as the palatal part).
It is. You can use this as it is as an original model, but
・To make the final product shown in Figure 7, 9 wax filaments with a triangular cross section are placed on the boundary line between the alveolar part and the palate part.
Put on. As shown in FIGS. 3 and 26, the wax filament ♂ has a U-shape as a whole. The wax filament does not reach the edge 7 of the alveolar portion lθ so that the final product is different from that shown in Fig. 2 and is shown in Fig. 27. Therefore, in the final product, as shown in Figure 16, the protruding ridges are closed (4t'a) without opening at the tips. The points along the tribute tank peak line A are the same. The original model, including the model that has undergone such modifications or the modifications described below, is hereinafter referred to as the basic model.

Figure ♂ shows a device called a flask used for mold making 9, 12 is a cylindrical flask with a truncated conical hole 13 drilled inside it, but the difference from the conventional one is that The base/g is given to this narrow 13,000 fil. This bottom/4t is in the shape of a ring that goes around once, but it may be provided as protrusions at several locations.

A hole /j is made in this bottom lug. It is not a large hole as shown in the figure, but may be a small hole.Ol is a bottom plate that presses against the bottom 14t of the truncated conical hole 13, and it is preferable that a surface that matches the conical surface is provided on the side periphery. , which is completely settled at the bottom. 4t0 is a collar provided on the bottom side. The basic model 0'' shown in Fig. 26 is placed on top of this bottom plate l. When shaving, a gap is created between the bottom plate 16, the model 0°, and the circular edge of the flask saw, so the gap is filled with plaster 3θ and only the area around the basic model 0' is buried in the flask 12 with plaster. Hereinafter, the flask will be referred to as a submerged flask.

Nine flasks 17 are also placed above the buried flask 12 in this state. This flask/7 also has a truncated conical hole l♂, and when both flasks 12 and 17 are stacked one on top of the other, the conical surface is preferably continuous. It is also good that the two are facing each other vertically. This is to prevent the silicone rubber that will be added later from entering the N7'A area of both flasks. Reference numeral 19 designates a lid plate that is fitted into the flask 17 and has a conical side circumferential surface, and is provided with indentations θ in some places. The flask 12 is slightly below this lid plate 12.
For example, in the center ((a thick hole (not shown) )
Silicone rubber may be press-fitted from the flask 17.
fRemove, bury, and immerse Silicone rubber mixed with a curing agent is packed into the flask 12 from above the basic model 0°0 Then, when the flask 17 is placed and the lid plate 19 is pressed down, the excess silicone rubber is pushed out from the hole 2θ. In this way, a shade of silicone rubber is formed. Note that the basic model O' is defined as attached.Furthermore, since the flask 12 is used for searching, it will be referred to hereinafter as the sampling ring flask.The silicone rubber negative mold thus made is indicated by A(L).

The silicone rubber mixed with a curing agent and press-fitted between the two flasks in the shape of an irregular shape hardens in about 7 to 10 minutes.After curing, when the molding 9-ring 2-screw 17 is separated from the immersion flask 12, the silicone rubber The negative mold A(-) is separated from the flask 12 and the basic model 0'' together with the ring flask 17. Silicone rubber negative mold A after separation (-)
will not fall off from the flask 17 due to the undercut 21.

Apply a mixed powder of zinc white and Merck (for example, Sikkaroll, Babyno (Fugu, etc.)) to the surface of the cured silicone rubber negative mold A (-) along with the mold making Schilling flask 17, remove the wetness on the surface of the silicone, and heat and dry. Then, put it in a dryer and dry it under heat for about 10 minutes. After drying, turn the dust ring flask 17 upside down from the state shown in Figure 1 and place it on the workbench (not shown) as shown in the diagram. ) Place the other flask on top of the ring flask 17, U
Place. This flask has a dome-shaped ceiling surface,
There is a spout 23 in the center of the dome ceiling. Further, the flask n is provided with a flange J, which is useful during press molding as shown in the figure. This flask n will be hereinafter referred to as a rubber press flask in view of the nature of the preforming described later.

fang? As shown in the figure, a rubber press flask n is placed on top of the mold ring flask 17, and a low-melting metal that melts at low temperatures is injected from the pouring spout 23, and is used for preforming I described later. Metal positive type A(+)f: Create.

Waiting for a cluster of low-melting metal, both flasks / 7.22
spaced apart. When separating, the negative metal mold A (→ is integrated with the rubber press flask n and the silicone rubber negative mold mA (
−) to leave.

Next, place a flask of the same shape as rubber press flask n on top of the flask 17, as shown in Figure 10, and make another negative metal mold B. +), but the usage is different as will be explained later.

If necessary, make three negative metal type B(+).

Since this flask 2j is also used when performing multi-piece molding using metal molds, it is hereinafter referred to as a metal press flask. It is convenient to prepare two or three metal press flasks 2j in accordance with the preparation of spaced gold mud ff1B(+)t-2,3. Separate it from the ring flask 17, turn it upside down and place it on the workbench, place a pair of flasks J (not shown) of the same shape on top of the metal press flask B (not shown), and place the flask 2 on top of the metal press flask B. Inject low-melting metal from the pouring spout to create negative metal type B(-) f:. This is also the same number of 2,
Make 3 pieces. In other words, metal yin and yang type B(+), B(-)
Make a ft2.3 set.

Turn the previously described metal press flask 3 containing the negative mold B(+) upside down, place the stainless steel plate d which has been preformed (described later) as shown in Fig. , the rubber pieces 29 and 31 shown in FIG. 13 are combined and placed.

The rubber piece 2 is horseshoe-shaped and has an appropriate thickness. The rubber piece 31 is U-shaped and also has an appropriate thickness. The former is positioned at a position corresponding to the roof of the mouth, and the posterior dissemination is positioned at a position corresponding to the alveolar area, and they are placed at the corresponding positions above the metal mold B(-) so as to sandwich the plate u. These rubber pieces are relatively soft, so their shape can be approximately any shape, but as shown by the dotted line in FIG.
In some cases, the top and bottom surfaces are appropriately rounded.

A metal press flask 2j containing fragments 2wa + 3i as described above is covered with gold over the cylinder 33 shown in the figure with O14, and O1 is covered with gold.
4, disk-shaped rubber P(1) and P(2) of appropriate size and thickness are placed and pressed with a piston 32 operated by hydraulic pressure or the like. This molding is called preforming I.

It should be noted that the plate I used in this preforming I has already been processed from a flat plate.
As explained in ♂3Wa No. 53, ``Simply put, as shown in Fig. 13, it is a disc plate with a hollowed-out middle dog part in the shape of a horseshoe. The outer shape may be a rectangular shape such as a pentagonal shape, and the apex of the corner may be used as the reference position.

Three types of such preformed grade 1 are mass-produced.

When such preforming I is performed, the alveolar part around the horseshoe-shaped recess that has already been elongated is well elongated and molded, making the next preforming I more effective.

Next, a rubber press flask containing metal positive star type A (+),
Place the plate that has been preformed I in the U by fitting it tightly into the mold A (+), lower the silicone negative mold A (-) on top of the plate, and place the O/4 as shown in the figure. As shown, cover the cylinder 33, and as before, use the rubber plates P(1) and P(2) to form by lowering the piston 3.2.This forming is called preforming I. .

Regarding the device shown in Fig. 14, the hydraulic press device consists of a hydraulic device that raises and lowers an elevating piston, and a table on which the elevating piston is placed. A crescent moon-shaped positioning stopper is provided for positioning and placing, and the flask U that is positioned and placed is directly below the lifting piston. As such an elevating piston, a piston 32 is shown in Fig.
The cylinder 33 is not a cylinder for the piston 3.2).

Next, the metal press flask 2 of the 1θ diagram was turned upside down, and the raw product formed by preforming I was mixed with gold B.
Insert into the positive type B (+) and place the metal inmeiya B (-
) and perform molding as shown in the diagram. This molding by the metal molds is called main molding.

Finally, set the immersion flask 12 and 14 as shown in the figure. The coining bed molded in this molding is finally molded using a basic mold O° and a silicone rubber layer A(-). This is called 't-final forming.

Although the full-course molding process has been described above, the preliminary molding 1 and 1 can be omitted, and the main molding can also be omitted in some cases.

Alternatively, the preliminary forming and the main forming may be repeated.

For example, when using a thin metal plate, preformability (Rfi forming) may be sufficient. In this case, only preforming and final forming may be sufficient. By using silicone rubber with good hardness,
In some cases, it may be better to omit the main molding.

If the forming process is summarized in a table, the typical ones are as follows.0 The above was described for the edentulous forehead, but the forming of the coining bed in the case of edentulous animals shown in Fig. 16 is as follows. It could be improved a little. This is the case in the upper jaw where the large front teeth are symmetrically crooked and the large back teeth are present. In this case, the coining bed does not have a U-shaped alveolar part, and the bottom part 33 of the U shape is missing, and a part of the palate (adhesive surface part, 2A) that is continuous from the missing alveolar part is also missing, resulting in three dents. In such a coining bed, a portion of the protruding ridge ′ along the alveolar crest line is also missing. In addition to this protrusion, the left and right alveolar parts 10. As a bridge across /θ, the protrusion 3
j is given. In the Olj diagram, this protrusion 3! is convex on the visible side and concave on the non-visible adhesive surface side, which is the same as the protruding bar 5. This protrusion 3j
is sometimes given two stripes, and is the same as the U-shape of the alveolar part, which is an inverted U-shape in plan view, that is, in Fig. 16,
It is oriented so that the protrusion is on the A, 2 side, but on the other hand, it may be made to be protruding on the AI side, so 2 protrusions 3! Zo (Explanation of function 9 function) Even if it is divided into several times, satisfactory molding cannot be achieved with metal molds. This type of coining bed is disliked because of its elasticity. The molded product must not be deformable. Therefore, it is molded with strong press pressure. Moreover, it is strict to the basic model, and it must be the same shape.
~For pre-ash form l, the pre-forming grate shown in the O/j diagram is used. This has a horseshoe-shaped indentation in advance, and a strong sword has already been added and drawn. Preforming I mainly involves forming the shape of the alveolar portion. Of course, at this stage, the locally uneven curved surface of the alveolar part is already almost the same shape as the basic model.However, "almost the same shape" is not a satisfactory coining bed.

In preforming l, the curved surfaces with small curvatures are exactly the same between the metal mold and the silicone rubber mold for both the alveolar part and the palate part.
It is reproduced as something identical to the basic model. Strong pressure is applied to the whole during preforming, and stress is applied to prevent deformation, so Pre-III! In molding ■,
Areas with small curvature are reproduced in the same shape as the basic model without any slight difference, and areas with locally large curvature are not completely isomorphic, but a large stress is applied to them. This is where the advantage of using Creecone rubber comes into play.

By the actual forming of the metal molds together, the areas with thick curvature, especially in the alveolar region, are completely formed. 0. Local elongation is given and large stress is applied. 0. If only the metal molds are used together, the local molding is done faithfully. Given the above, there is a risk that the connection at the boundary between a local area with a large curvature and a local area with a small curvature will not be smooth, but by performing final molding with the basic model and a silicone rubber mold9, the uneven connection will become smooth and , the finish is the same as the basic model 9, and the elasticity is taken.

Even if elasticity is maintained, the coining bed, especially the coining bed of an edentulous jaw, has a spherical or parabolic palate, which is strong against bending in any direction, and is not deformable. Furthermore, the alveolar part also has a U-shaped cross section, and the alveolar part surrounds the palate part in a U-shape. Enhanced deformation resistance.

The coining bed, which inherently has excellent deformation resistance, therefore only needs to be molded with excellent precision. For this reason, it is preferable to use a material substrate that is as thin as possible. Using a thinner substrate not only improves accuracy but also has the advantage of being lighter. If it is too thin, the deformation resistance will be poor, especially the deformation resistance of the flat part of the mouth.
This more than compensates for the poor deformation resistance caused by the thinner layer.

The protrusion 3j exhibits an excellent function in an 8-jaw coining bed. In Figure 116, the resistance to bending around the line B/-B2 is U-shaped at the palate and inverted U-shaped at the alveolar section on a cross section including that line. Although very strong, it has weak resistance to bending about the A/-- line. However, protrusion 3! When bridged between the alveolar parts on both sides, it becomes extremely strong. Since the toothed type shown in Fig. 116 has a lower molding precision than the edentulous type, a thicker substrate can be used. Since the protrusions 3j are provided on the thick substrate, the deformation resistance is extremely excellent.

Such protrusions 3! By applying a single preform with high precision using a thin substrate, the basic model will not be unduly distorted in the final forming stage, so the plaster of the basic model will not be damaged.

In the final forming, as shown in the figure, the flask/2Vζ is provided with a bottom/g, so when strong pressure is applied, the bottom plate/o will not sink into the conical surface. The inner surface of the flask 12 was formed into a conical surface so that the bottom plate 16 could be easily removed from the flask 12 by tapping it from the back side, and since the final shaping concept was not to have a glans, a bottom/g was not provided. If the final molding is performed without the bottom/4t, the bottom plate will be slightly tilted and the conical surface will be wedged, and there is a risk that the basic model will be damaged due to a slight misalignment between the basic model and the silicone rubber mold A (=). However, since the bottom lug is provided, the bottom plate 16 will not tilt even slightly.

(Effects) According to the first invention, since the final molding is performed after the preforming with high precision, it is possible to perform the molding with extremely high precision while preventing damage to the basic model.

According to the 22nd invention, since a thin plate material can be used, the effect of the 1st invention can be further exhibited.Moreover, the chamber effect of the protrusion allows the viscous surface of the coining bed to be applied to the roof of the mouth. 0 Note that the tongue is applied to the part There's nothing wrong with 3j in terms of texture.

According to the third invention, since the basic plaster model is not damaged, the technique for realizing the object of the first invention can be further established.

[Brief explanation of drawings]

The OFF view is a sectional view of the preceding coining denture base, the OFF view is a slope view of the coining base, FIG. 3 is a plan view of the basic model, the OG view is a front sectional view of FIG. 3, and FIG. 6 is a front sectional view of the basic model, FIG. 6 is a plan view of FIG. 5, FIG. 2 is a front sectional view of a part of the coining bed according to the present invention, and FIG. 1 is a front sectional view showing a rubber press flask, etc. , the off view is a front sectional view showing a rubber press flask, etc., FIG. 10 is a front sectional view showing a metal press flask, etc., FIG. 311 is a front sectional view showing a spare dish type I, and FIG. FIG. 13 is a front view thereof, FIG. FIG. 0”...Basic model 11...Gier 12...Coin-floor, 1!A, ,Adhesive surface part, 2B, ,Rice tank part, DA°0
0. Projection, g800. Being closed, 12.9.
Buried flask, 13. ,, hole, /4t+1. Bottom, /4.
,,bottom plate, 3j. 6. Projection, A(-), , Silicone rubber negative mold, A(10)10. Metal type device, B(-) , , Metal type negative type, B
(+)...Metal type device. Applicant Mura 1) Tomi male agent Yoshio Nagaishi 30 29 30 ／φ ／6 ／仝

Claims (1)

[Scope of Claims] (1) A method for molding a metal denture coining base, which is characterized in that after preforming using a silicone rubber mold, final molding is performed using a basic model and a silicone rubber mold. (2) A metal denture coining base characterized by having a concave protrusion on the adhesive side extending between the alveolar parts on both sides. (8) A flask for making a coining bed, which has a conical hole, and is characterized in that a bottom is provided on the narrow side of the hole, and a bottom plate is fitted into the bottom.