JPH0311774B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a so-called wax spatula for dental technology, and specifically relates to improvements in its shape and structure. Hereinafter, the wax spatula according to the present invention will be referred to as a wax pen spatula or simply a wax pen in view of its shape, structure, and function.

[Prior art]

In order to manufacture crowns, bridges, or metal denture bases by casting, a wax pattern must first be created.

Indirect methods, direct methods, and others are known as techniques for this purpose, but excellent impression materials and tooth mold materials have been developed and introduced, and they have been improved in terms of dimensions, morphology, and surface conditions. It is highly accurate in terms of
Nowadays, extremely good working models for the indirect method can be easily produced and used, and it can be said that the indirect method is the mainstream. This indirect method includes pressure welding, wax coating, and wax bathing, but in recent years,
Of these, the wax coating method seems to be the most commonly used.

By the way, regarding this wax coating method, for example, in ``Wax Up'' published in 1978 as a separate issue of the monthly magazine ``Dental Technique'' published by Ishiyaku Publishing Co., Ltd., there is an article that states, ``The wax coating method uses heated instruments. Scoop out a small amount of wax and apply it to the tooth mold, or
Or, there is a way to liven it up. In this case, in order to reduce deformation due to shrinkage, it is necessary to apply a small amount of wax, wait for it to sufficiently harden and release the distortion, and then gradually add more wax on top of it. ...(Omitted)...This technique is easy to deform both in terms of materials and operation, and is inferior to the pressure welding method in terms of the strength and precision of the wax mold obtained, but it is easier to form. This method seems to have been widely used in recent years because it is easy. There is a statement to that effect.

Furthermore, ``The anatomical wax formation method, which is one of the dental crown preparation methods, involves a. application of a separation agent to the tooth mold, b. raising of the axial surface, c. raising of the occlusal surface, and d. dentition model. Return to the original position and add more contact points, e. Close the articulator and regulate the height, f. View the model from the front and adjust it to harmonize with the front and rear crowns,... (omitted)...i .Formation of minor grooves and minor ridges,...(omitted)...k. Taking out the tooth pattern and modifying the axial surface form, l. Forming raised areas at contact points, m. Finishing the crown edge, n. Surface finishing It is made up of a complex work process that takes the following order.

In the series of technical operations to form even a single crown on a plaster model made by taking impressions directly in the patient's mouth using silicone rubber, etc., the above-mentioned wax-up work requires extremely high skill. In addition, in the restoration of tooth morphology and prosthesis of defective areas, it is necessary to take into consideration the occlusal relationship, jaw/muscle movement, adjacent left tooth, and periodontal structure from a comprehensive perspective. Crown restoration is required, and it is no exaggeration to say that this series of dental techniques begins and ends with wax-up, and is extremely important work. ” can also be seen in the explanation of the gist.

As mentioned above, waxing, which is part of a series of dental techniques, takes a considerable amount of time and has physiological, functional, and aesthetic requirements. In order to perform the technique faster and more accurately, highly accurate equipment is required.

For this purpose, the wax spatula for dental techniques that have been prepared traditionally are spoon-shaped,
There are various shapes such as needle-shaped and knife-shaped, and each can be modified and improved with different sizes and dimensions, such as size, length, thickness, etc.

The reality is that each technician selects a number of waxes and spatulas available on the market and either uses them as is or makes slight improvements to their own, but at present. Although there are differences in size and dimensions, rod-shaped or spoon-shaped spatulas are often used.

Hold the tip of the wax spatula over a dental Bunsen lamp to heat it, scoop out the wax, and pass the melted wax through the spatula.
The wax builds up, but in relation to the heating temperature, the solidification rate of the wax, the amount of wax collected in the spatula, etc., there are specific problems such as overheating, scooping out too much wax, etc. Due to this, inconveniences such as wax dropping outside the target area are likely to occur.In short, in order to perform the desired wax up work smoothly and efficiently, dental technicians must carefully select the appropriate spatula. It can be said that one has no choice but to rely on the skill and intuition of the master.

In each wax-up job, technicians must quickly select a large number of prepared spatulas and use them while exchanging them, but they also have to move their hands diagonally, sideways, and up and down. The fingers of a skilled practitioner are even called gold fingers because they need to be operated freely and appropriately, and truly require artistic skill.

Even when done by such a skilled technician, in the past, excess wax melted from the tip of the spatula would drip onto the model due to surface tension, so it was necessary to scrape off that amount. This often happened. For example, even if you use a rod-shaped spatula, the amount of molten wax that becomes spherical at the tip will not go below a certain value, so it is almost impossible to raise the amount below this certain value. In short, there is still a lot of room for improvement in the conventional wax spatula, which seems to have been cultivated over a long tradition and has been improved over time.

[Problem that the invention seeks to solve]

The present invention has been made in view of the current situation, and not only eliminates the inconvenience of melted wax dripping onto the model from the tip of the wax spatula in an amount greater than the required amount during wax-up work, but also It is possible to hold a larger amount of wax than before so that the wax scooped into the spatula does not run out in a short time, and with some skill, it is possible to pour out the appropriate amount of wax as desired each time. It's easy to do. The purpose is to provide improved wax spatula for dental techniques.

The wax pen spatula of the present invention has a flow surface for melted wax at the pen tip, an upwardly projecting bulge, and a wax reservoir for holding the molten wax connected by a concave curved surface. Further, the wax flow surface is characterized in that a thin groove is carved from the wax reservoir to the tip of the pen. Further, it is desirable that the overhang has a small hole for introducing outside air that opens into the wax reservoir.

〔Example〕

The present invention will be explained below using examples. 1 to 5 show a first preferred basic form of the present invention.
This shows the main part of the embodiment, in which a wax reservoir 4 is provided at an appropriate distance from the tip 3 of the pen nib 1 to the root 5 side of the nib. This wax reservoir 4 for holding melted wax protrudes from the base 5 of the pen nib 1 in the direction of the pen tip 3, and is provided on the lower surface of the overhang 6 and on the surface side of the pen nib 1. is connected to the melt flow surface 2 by a concave curved surface. In this embodiment, a concave portion 9 is formed in the flow surface 2 located near the wax reservoir 4, and an overhang 6 is formed to expand the area of the wax reservoir 4 and to apply air pressure from above the wax reservoir 4. A small hole 8 for introducing outside air is provided at the back of the wax reservoir 4. A small hole 9a is bored approximately in the center of the recess 9 included in the area of the wax reservoir 4, and this small hole and the tip 3 of the nib portion 1 are connected by a thin groove 10 carved therebetween. There is. The recess 9 may not be provided in some cases.

The small holes 9a are extremely convenient and useful for setting the base end position of the groove 10 and for carving grooves each having a desired appropriate small gap (width).

Also, the back wall 11 of the wax reservoir 4 is shown in Figure 2~
As shown in FIG. 5, both the left and right sides have smooth curved surfaces and come together toward the tip, forming a leading line 12 that resembles the shape of the bow of a ship, for example. This not only makes it possible to increase the amount of melted wax liquid held, but also makes it easier to flow out against the surface tension.
Moreover, it is possible to effectively prevent the undesirable phenomenon of too much wax gathering at the top of the wax reservoir 4 and resulting in too much flowing out. For the same reason, the ceiling surface 13 of the overhang 6 may also be a curved surface that rises toward its leading end 7.

Figures 6 and 7 show the wax reservoir 4 as 4(1).
and 4(2), which shows a second embodiment constructed from two parts. In this case, like the overhang 6 in which the wax reservoir 4 was formed in the first embodiment shown in FIGS. The wax reservoir 4(1) is formed on the lower surface side of the overhang 6a, which is not a tapered parabolic shape but is formed of a part of a convex curved surface included in a cylindrical or spherical surface, for example.

In order to smoothly flow and outflow the wax melt in the wax reservoir 4(1) toward the pen tip 3 side, the projection 6 is placed on the center line of the projection 6a in the first embodiment. Small hole 8 provided
For the same purpose, an air hole 8a is bored at a suitable location near the base 5 of the pen nib 1, and a strip groove 14 is carved from this air hole to the tip edge of the overhang. .

Further, at a position where most or completely protrudes from the lower surface side of the overhang 6a (see FIG. 6), a recessed portion having a small hole 17 in the center is provided in the wax flow surface 2 as a wax reservoir 4(2). Furthermore, a groove 10 having a desired small gap (width) is cut from this small hole 17 to the pen tip 3.

As is clear from the first and second embodiments described above, in the wax pen spatula according to the present invention, a wax reservoir 4 is formed on the wax flow surface 2.
(including recess 9 and small hole 9a), 4(2) including small hole 17) to pen tip 3 with an appropriate small gap (width). 10 is engraved.

The melted wax held in the wax reservoirs 4 and 4(2) does not flow down under normal conditions due to surface tension, but by slightly moving the wrist holding the pen spatula, the tip of the wax can be removed. When lowered, a certain amount can be reliably flowed out and transferred toward the pen tip 3 through this groove 10. Note that this outflow amount can be adjusted and controlled as desired by the width of the gap between the grooves provided on the spatula used and the downward inclination angle of the tip thereof.

In FIG. 6 showing the second embodiment, the wax melt stored in the wax reservoir 4(1) is sucked by the lower surface 13a of the overhang (ceiling) 6a, etc.
Because it is under tension, it is usually held in a state that makes it difficult to eject. However, as explained later,
If necessary, by slightly shaking the pen spatula in its length (vertical) direction, an appropriate amount can be transferred to the wax reservoir 4(2).

The form of the wax reservoir 4 has been described above with reference to two different embodiments. In the second embodiment illustrated in FIG. Since it has a tapered shape when viewed from above, the boundaries and ring spacing of the area of the wax reservoir 4 are unclear, but which embodiment is better depends on their configuration. It doesn't matter, it depends on the purpose and how you use it. In summary, the second embodiment can be applied to rough molding which requires a large amount of wax, and the first embodiment can be applied to precision molding where a large amount of wax would be inconvenient. For example, in precision wax-up work, there may be cases where the projection 6 is required to be thin as a whole, and the pen tip portion 1 is also required to be thin as a whole.

In the second embodiment, when the pen tip 1 is heated with a burner and pressed onto a lump of wax, the molten wax flows through the small hole 17.
Wax accumulates in the recessed part of the wax reservoir 4 (2), so if you tilt it so that the wax reservoir 4 (1) is lower,
The wax liquid in the wax reservoir 4(2) is sucked into the wax reservoir 4(1) and flows into the wax reservoir 4(1).

When the pen tip 1 is tilted so that the tip 3 of the pen is downward, in the case of the first embodiment, the wax pool 4
The liquid held in is pulled towards the recess 9,
The liquid that has flowed into the recess 9 is pulled by the tension of the groove 10, which is stronger than the force that pulls it back backwards.
It is continuously guided to the tip 3 of the pen. In this way, when the liquid reaching the tip 3 of the pen is consumed, the groove 10 is immediately replenished by that amount. The melt in the wax reservoir 4(1) is transferred to the lower surface 1 of the overhang 6a.
3a, etc., so unless the pen tip 3 comes into contact with another object and the liquid is taken away by that object, it will not drip down on its own.

The wax pen spatula shown in the second embodiment has a large amount of wax, but can also use a large amount at one time. Due to the imbalance between gravity and surface tension, the melt flows out through the groove 10, but in this example, the amount held is large and the gravity is proportionally large, so the amount that flows out is small. There are also many.

Although it is recognized that skill is required in adjusting the way to tilt the pen tip 1, how long the pen tip 3 is in contact with the object, and the amount of wax liquid stored, compared to conventionally known wax spatula of this type. And since the amount of wax melt flowing out and transferring is quantitative,
The easier it is to handle, the more its handling,
The more accustomed one becomes to the operation, the more one's natural skill will be utilized.

9 to 14 are exemplified to demonstrate the superior performance of the pen spatula according to the present invention, and FIGS. 9 to 11 illustrate the first embodiment of the present invention shown in FIGS. 1 to 5. FIGS. 12 to 14 are plan views of several loci drawn with a wax melt on graph paper using a pen spatula and a conventionally known spatula, respectively.

That is, Fig. 9 was obtained by pressing the tip 3 of the pen at small intervals on the surface of the graph paper while occasionally warming the pen tip 1 with a burner, without replenishing the wax. It is something.

On the other hand, when using the conventional type of narrow spatula, as is clear from Fig. 13,
The inconvenience that the molten liquid ran out quickly and could not be continued was unavoidable.

Therefore, if a large amount of wax was placed on the spatula in order to prevent the liquid held in the spatula from being consumed too quickly, it was impossible to draw a small circle as shown.

FIG. 10 shows a fine line drawn using the pen spatula according to the present invention. On the other hand, when using a conventional spatula, only the lines shown in FIG. 12 could be drawn.

Further, the difference between the pen spatula according to the present invention and the conventional spatula when similar spirals are drawn is clearly shown in FIGS. 11 and 14 in contrast, and here FIG. Needless to say, it is based on Pen Spatuyura.

As is clear from the explanation with reference to FIGS. 9 to 14 above, in the wax pen spatula according to the present invention, remarkable quantitative properties are observed in the amount of wax melt flowing out and transferring, and the law of gradual decrease is also applied very well. It will be understood that wax-up work will be very easy if this is used.

[action, effect]

As described above, according to the present invention, by simply moving the wrist and appropriately adjusting the inclination of the pen spatula, a predetermined amount of molten liquid is poured from the wax pool through the groove. This allows the pen to flow smoothly and reliably down to the tip of the pen, and allows visual observation of the state in which the pen is transferred from the tip onto the target model.

Therefore, once you have some skill, you can apply layers of wax to any desired thickness just like drawing lines with a pen, which prevents wax from dropping into unnecessary areas and creates fine details. It becomes possible to accurately and easily perform microscopic wax-up on parts.

With the conventional spatula, it was often necessary to scrape off the excess amount of wax after curing because too much melt came out, but according to the present invention, such inconvenience hardly occurs.

In the unlikely event that there is a little too much wax, simply heat the tip of a clean pen and touch it to the area, and the spatula will absorb it through capillary action, removing the unnecessary amount. Because it can be easily removed, it is convenient for forming dental crowns.

As clearly shown in Figures 4 and 7,
Both left and right end edges 18 on both sides of the back side of the groove 10, including the pen tip 3 that follows them, are formed in a knife edge shape, so they can be used for scraping off hardened wax or engraving a tooth pattern.

If you install a temperature-controlled and adjustable heater near the base 5 of the pen nib 1 so that you can accurately know the melting temperature of the wax, you will avoid heating the wax more than necessary. As a result, undesirable changes in the composition of the wax can be prevented and the wax-up work can be carried out efficiently.

A large pen with a heater integrally attached near the base of the pen tip is especially convenient for forming the gingiva on the denture base, but if it is made large, heat will be generated throughout the pen tip and even the tip of the pen. Since it tends to become difficult to turn sufficiently, it is necessary to make some modifications to its shape and structure, as in the third embodiment shown in FIG.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the essential parts of the first embodiment of the wax pen spatula according to the present invention, FIG. 2 is a front view thereof, FIG. 3 is a plan view thereof, and FIG. 4 is the same as that in FIG. 5 is a left side view of the cross section taken along the - line; FIG. 5 is a front view of the cross section taken along the line - in FIG. 3;
FIG. 6 is a perspective view showing a main part of a second embodiment of the present invention, FIG. 7 is a right side view of a cross section taken along the line - in FIG. 6, and FIG. 8 is a main part of a third embodiment of the present invention. FIGS. 9 to 14 are perspective views showing the pen according to the present invention.
FIG. 2 is a plan view illustrating the locus of a similar figure drawn on graph paper with a wax melt using a spatula and a conventionally known spatula. 1... Pen tip, 2... Wax melt flow surface, 3... Tip of pen, 4, 4(1), 4(2)... Wax reservoir, 5... Root of pen tip, 6,6a...
... Overhang, 8, 8a ... Small hole for introducing outside air, 9
... recess, 9a ... small hole, 10 ... split groove, 13 ...
...Ceiling surface of overhang 6, 13a... Overhang 6a
Bottom surface of 14... split groove, 17... small hole.

Claims (1)

[Claims] 1. The pen tip has a flow surface of melted wax,
An overhang extending upward and a wax reservoir for holding wax melt connected by a concave curved surface are provided, and the wax flow surface has a thin strip extending from the wax reservoir to the tip of the pen. Wax pen spatula for dental technology, characterized by having grooves cut into it. 2. The wax pen spatula according to claim 1, wherein the overhang has a small hole for introducing outside air that opens into the wax reservoir.