JP2000245749A - Base of work model for dental technician - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base for work model capable of providing the sure and easy cutting of a tooth form block, and certainly judging a position of a dowel pin. SOLUTION: A base is formed by a base member 10 and a connection pin member 20 engaged with the base member 10, the connection pin member 20 is formed by integrating a plate 22 and a pin 24, and a recess 23 corresponding to the pin 24 is formed on a lower surface of the plate 22. On the other hand, a land 12 having the shape approximately same as the plate 22 is formed on an upper surface of the base 11 of the base member 10, and a projection 13 formed on an upper surface of the land 12 is closely fitted in the recess 23. An impression model A is fixed to an upper surface of the plate 22, and the plate is cut to the land 12 along a cut line C, so that the plate 22 is surely cut off and the tooth form block can be cut down.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working model base used for producing a dental prosthesis or the like.

[0002]

2. Description of the Related Art Conventionally, when a dental prosthesis is manufactured, an impression model (tooth model) is formed with gypsum based on a negative shape of a tooth taken from a patient's mouth, and the lower surface of the impression model is flattened to form a hole. Open the dowel pin, fix it with an adhesive, form an anti-rotation groove if necessary, apply a mold release agent (for example, a surfactant) to the lower surface of the impression model and the dowel pin, and prepare a gypsum paste in advance. Is pressed into a silicone rubber mold for a base filled with, and after the gypsum paste is hardened, the mold is removed to produce a working model for dental technology.

[0003]

As described above, in order to produce a working model, an impression model is perforated, dowel pins are aligned and embedded,
Since many manual operations require skill and time, such as formation of rotation prevention grooves and integral molding with the base, and poor workability, an intermediate member in which a large number of dowel pins are arranged and arranged in advance between the impression model and the base. It has been proposed to intervene (for example, JP-A-6-22988 and JP-A-10-201774).

However, when cutting out a tooth block for a molding die for producing a prosthesis from a working model, it is impossible to separate only the tooth block from the working model unless it is completely separated from an adjacent tooth profile. However, since the intermediate member is very thick or the intermediate member is buried in the gypsum of the base, the intermediate member cannot be reliably separated without cutting deep into the base when cutting with the cutter. There is. Further, since the pin is hidden in the base, the position of the pin is not known at the time of cutting, and the pin may be cut.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a work model base in which a tooth block can be cut out reliably and easily, and the position of a pin can be clearly identified.

[0006]

In order to solve the above-mentioned problems, the present invention relates to a working model for dental technics in which a number of pins formed on the lower surface of a plate are inserted into a base member so that the plate can be engaged with the base member. On the base, lands having substantially the same shape as the plate are formed on the upper surface of the base member, and irregularities are formed on the lower surface of the plate and the upper surface of the land, which are closely fitted to each other in correspondence with the positions of the pins. And a configuration formed at the front edge of the land. In particular, the plate and the base member are integrated so as not to be separated during handling.

[0007] The irregularities may be formed on the front and rear edges of the plate and the land pin. Further, it is preferable that the shape of the unevenness is such that the depth or height is reduced in the direction of the pin, or the tip is narrowed in the direction of the pin, and the cross section of the unevenness is formed in a semicircular shape. Is good. In addition, if the colors of the plate and the base member are different, the identification is easy.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIGS. 1 to 4, the base of the present invention includes a base member 10 and a connecting pin member 20 engaged with the base member 10. Base member 10
Is attached to an articulator (not shown)
A substantially horseshoe-shaped land (step portion) 12 is formed on the upper surface of a substantially semi-elliptical base 11 having a certain thickness, and a protrusion 13 is provided at a front edge of the land 12. A pin insertion hole 14 is formed.
It is sufficient that the land 12 has a thickness (height) of about 1 to 2 mm.

The connecting pin member 20 is connected to the land 12
A number of pins 2 are provided on the lower surface of
4 is provided integrally, and a concave portion 23 into which the projection 13 of the base member 10 just fits is provided on a front edge of the plate 22 on the lower surface of the plate 22. Therefore, the position of the concave portion 23 corresponds to the position of the pin 24.
The upper surface of the plate 22 is flat, but is preferably roughened. The thickness of the plate 22 is 2 to
It is about 3 mm.

The material of the base member 10 may be synthetic resin or light metal other than gypsum, and the material of the connecting pin member 20 may be synthetic resin or light metal such as aluminum.
The members 10 and 20 are both integrally molded products. First, the connecting pin member 20 is integrally molded, a mold release agent is applied thereto, and then the base member 10 is molded in the manner of insert molding. The projection 13 is formed by
, A pin insertion hole 14 is formed. In order to prevent the connecting pin member 20 from being easily detached from the base member 10 due to an impact at the time of handling such as transportation, display, or production of a working model, both are engaged so that they are lightly tight-fitted or lightly pressed. Is preferred. Of course, after cutting out a tooth-shaped block to be described later, it is necessary to make the block easily removable from the base 11.

As shown in FIG. 3 and FIG.
When a pair is provided before and after each pin insertion hole 14, the effect of preventing rotation is further enhanced. Then, as shown in FIG. 3, it is preferable that each of the protrusions 13a and 13b is inclined toward the pin insertion hole 14, that is, so that the height thereof decreases inward. In response to this inclination, the recess 23
a and 23b are also reduced in depth in the direction of the pin 24. The planar shapes of the projections 13a, 13b and the recesses 23a, 23b are also tapered in the direction of the pin 24, and have a semicircular shape such as a semicircular or semielliptical cross-sectional shape. When the projections 13a and 13b and the recesses 23a and 23b are formed in this manner, the connecting pin member 20 can easily adhere to the base member 10 easily, and after the cut-out tooth-shaped block is pulled out from the base 11, it is fitted again. Since no misalignment occurs during handling, the occlusion of the dental prosthesis or the like does not change.

When the above-mentioned base is used, as shown in FIG. 5, an impression model A whose bottom is trimmed flat is fixed to the upper surface of the plate 22 of the connecting pin member 20 with an adhesive. At this time, since the bottom surface of the impression model A and the plate 22 have substantially the same shape, the plate 22 and the bottom surface of the impression model A just overlap. This can be achieved by designing the shape and size of the mold of the plate 22 in advance as such in advance. Of course, it is also possible to prepare a base having several types of plates 22 and select an appropriate size. Then, when cutting is performed along a cut C shown by a chain line in FIG. 5, the plate 22 is reliably cut off, and a tooth block B as shown in FIG. 6 is cut out.
The cut C does not need to be made up to the base 11 portion. When the cut C reaches the land 12, it can be visually determined that the plate 22 has been completely cut. In particular, plate 2
If the colors of the land 2 and the land 12 are made different from each other, it can be more easily determined. Further, since the projection 13 and the concave portion 23 are provided on the front edges of the plate 22 and the land 12,
There is no danger of cutting the position. As shown in FIG. 6, the cut-out tooth block B has a plate cut piece 22a having the same shape as the bottom surface of the gingival portion D of the impression model, and is integrated therewith, and it is guaranteed that the pin 24 stands on the lower surface thereof. . This is because the pins 24 are provided corresponding to the recesses 23a.

In the embodiment shown in FIGS. 1 to 5,
Although the anterior tooth model base has been described, it goes without saying that the present invention is also applicable to a base for a full-jaw model, a one-jaw model shown in FIG. 7, and a general-purpose model shown in FIG. In addition, the projection 13 and the recess 23 are
The land 12 may be provided with a projection, and the land 12 may be provided with a recess. Further, the base member 10 can be subjected to various processes for facilitating attachment to the articulator.

[0014]

According to the present invention, as described above, the integrally formed base member and the integrally formed connecting pin member are engaged to form a base, and the engaging portions of the two are provided with irregularities. Correspondingly, a pin is provided on the plate of the connecting pin member,
The tooth block can be cut out by checking the position of the pin, and the pin is not damaged by the cutter. Further, by providing the irregularities before and after the pin, the effect of preventing the cut tooth block from rotating is further enhanced, and the irregularities are inclined in the pin direction so that the height or the depth becomes smaller, so that the base of the tooth block is reduced. This has the advantage that the adhesion to the dental prosthesis can be increased and the accuracy of the completed dental prosthesis is increased.

[Brief description of the drawings]

FIG. 1 is a plan view showing a base of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is an exploded sectional view of the above.

FIG. 4 is an exploded plan view of the above.

FIG. 5 is a front view of a working model.

FIG. 6 is a perspective view of a cut-out tooth block.

FIG. 7 is a plan view showing another example of the base.

FIG. 8 is a plan view showing still another example of the base.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Base member 11 Base 12 Land 13, 13a, 13b Projection 14 Pin insertion hole 20 Connection pin member 22 Plate 22a Plate cut piece 23, 23a, 23b Depression 24 Pin A Impression model B Tooth block C Cut D Gingival part

Claims (7)

[Claims] 1. A base for a working model for dental technics wherein a plurality of pins formed on a lower surface of a plate are inserted into a base member so that the plate can be engaged with the base member. Lands having substantially the same shape are formed, and irregularities are formed at the front edges of the plate and the land on the lower surface of the plate and the upper surface of the land so as to fit in close contact with each other in accordance with the positions of the respective pins. Base. 2. The work model base according to claim 1, wherein the plate having the pins and the base member are engaged and integrated by means of light interference fit or light press-fitting. 3. The work model base according to claim 1, wherein the unevenness is formed at front and rear edges of the plate and the land pin. 4. The work model base according to claim 1, wherein the shape of the unevenness is such that the depth or height decreases in the direction of the pin. 5. The work model base according to claim 1, wherein the tip of the unevenness is narrowed in the direction of the pin. 6. The work model base according to claim 1, wherein a cross section of the unevenness has a semicircular shape. 7. The work model base according to claim 1, wherein the plate and the base member have different colors.