JPH0696020B2 - Gingival exfoliation device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a gingival exfoliation device in the field of dentistry, and in particular, it is capable of excavating gingiva in a short time without causing pain to a patient, and gingiva. The present invention relates to a gingival exfoliation device suitable for accurately making an impression even to a root portion (a part of a tooth buried in the gingiva) under the margin.

(Prior Art) Among dental prosthesis (manufacturing and mounting crowns, bridges, dentures, etc.) treatments, crown restoration, denture (crown,
The impression for making a bridge is to make a crown impression (the act of scraping teeth) according to the purpose first, and make an overall impression with an emphasis on making a clear impression of the formation limit (tooth formation margin). There must be. However, in the impression method when the gingiva is formed under the gingival margin (the part of the tooth embedded in the gingiva), the diameter of the
The gingival retraction methods such as the "Zinpack method" in which a 1.0 mm cotton thread is pushed along the tooth surface to the root part or the "temporary attachment method" in which a temporary crown is worn for one or two days are adopted.

The former has the technical difficulties of press-fitting cotton threads and the pain of the patient, and the latter has the problems of manufacturing temporary fittings and increasing the number of visits to the hospital. The subgingival impression is often unclear and inaccurate.

This means that a defective prosthesis, which is predicted to be incompatible (the product will not last long), must be produced unavoidably,
It can be said that there is an inherent problem in the quality control of dentistry due to the unestablished gingival exclusion technology.

(Problems to be Solved by the Invention) The present invention has been made in order to provide a gingival exfoliation device capable of reliably and easily performing gingival exfoliation without suffering pain or damage to the gingiva.

(Means for Solving the Problem) The gingival excluding device of the present invention is a novel device that solves the above-mentioned problems, and has been completed as a result of various inquiries by the present inventor.

The gingival excluding device of the present invention comprises a tray having a groove-shaped cross section with or without through holes in the wall layer filled with a rubber compound having a yield property, or having or without through holes in the wall layer. A tray having a groove-shaped cross section, which is not provided, is provided with a rubber compound having a yield characteristic in a tray in which a strip-shaped protrusion is provided on the side wall inwardly along the length direction.

Among the above, as the tray having the groove-shaped cross section, any of well-known dental impression trays having or without through holes can be used.

Although a rubber compound having a yielding property per se is known, the present inventor found for the first time about the fact that this compound is suitable for gingival retraction and that an excellent effect can be obtained by combining it with a tray having a groove-shaped cross section. It is a thing. Here, the yield property is a well-known concept in the theory of physical properties, and when an external force is applied to an object, it shows elasticity if the stress is within the elastic limit, and if it exceeds the elastic limit, plastic deformation (in other words, flow) occurs. It refers to the property that causes it. Regarding this yield property, it is known that the elastic limit (the limit at which flow occurs, that is, the yield point) changes when the deformation rate (strain rate) of an object is changed, and the rubber compound used in the present invention also has such a property. It is a thing. Specific examples of the rubber compound having such characteristics include silicone-based bouncing putty, but it is desirable to select it in consideration of harmlessness to the human body. [For example, as a silicone-based commercial product, manufactured by Shin-Etsu Chemical Co., Ltd., trade name X-65-
There are 242. Next, a tray having a groove-shaped cross section with or without a through hole is provided with strip-shaped projections along the length direction inside the side wall. Regarding the shape and dimensions, the strip-shaped projections are provided. It may be of a known dental impression tray except for the above. The present inventor first discovered the effectiveness of this band-shaped projection. A strip-shaped protrusion having a triangular cross-section with a base of about 2 to 3 mm and a height of about 2 to 3 mm is suitable. The strip-shaped protrusions are usually provided one by one on one side wall of the tray over the entire length of the tray, and the center of the bottom side of the protrusion cross section is preferably about 5 to 6 mm from the edge of the side wall. Further, the tips of the band-shaped projections can be rounded as needed.

The material of this tray is not particularly limited as long as it does not easily deform and is harmless and can be disinfected, and various metals and plastics are used. In the case of metal, press molding method or casting method, plastic In this case, injection molding may be used for molding. An example of the tray provided with the strip-like protrusions is shown in FIG.

As the rubber compound having a yielding property for filling the tray provided with the band-shaped projections, the above-mentioned ones can be used in the same manner.

It should be noted that it is optional to prepare several kinds of sizes as needed with the tray having the groove-shaped cross section and the tray provided with the band-shaped projections, and the filling amount of the rubber compound may be appropriately determined depending on the size of the tray. . In addition, the rubber compound can be used in different types of hard and soft depending on the state of the periodontal tissue (presence or absence of periodontal disease and symptoms), and can be mixed with a hemostatic agent.

An embodiment of the gingival excluding device of the present invention is shown in FIG.

When using the gingiva excluding device of the present invention, grasp the bottom of the tray with a fingertip and apply a pressing force until the rubber compound is pressed against the tooth to be impressed until the state shown in FIG. The gingiva is opened by resting for about a minute, so that the gingiva-removing device may be removed, and the impression may be made by a known method within about 5 minutes thereafter.

When using a tray having a band-shaped protrusion, a tray having a size such that the protrusion does not directly contact the gingiva should be selected, and one example of its usage is shown in FIGS. 3 to 5.

(Operation and effect) When the gingival excluding device of the present invention is used, the gingiva is freely opened due to the repulsive force (elasticity) of the rubber compound, and the fluidity of the rubber compound causes press fitting into the details, which locally makes it impossible. Gingival retraction can be performed easily and reliably without being overwhelmed. By the way, conventional impression compounds have no repulsive force at all, and because they are thermoplastic, they do not show fluidity at room temperature (body temperature). And, it cannot be used as a substitute for the rubber compound using the gingival excluding device of the present invention.

When the tray is provided with a protrusion, the protrusion promotes the flow of the rubber compound in the tooth direction, and the gingiva portion is largely opened, which is particularly effective when the free gingiva is hard. Furthermore, when there is no through hole in the wall layer of the tray, it also promotes the flow of the rubber compound, so that the presence of the protrusion increases the action of the protrusion. That is, depending on the hardness of the free gingiva, the presence or absence of the protrusions of the tray and the presence or absence of the through holes may be properly used, and it is possible to cope with a wide range of states of the gingiva.

In comparison with the conventional technique, when the gingival excluding device of the present invention is used, it is possible to extrude for a long time with a hard solid like a temporary crown without pushing in a specific shape such as cotton thread with tweezers. There is no gingival damage because there is no problem. This is a remarkable progress as compared with the conventional method in which excessive gingival separation or long-term gingival retraction may delay or disable gingival recovery, which is a problem.

Further, since the process is greatly shortened and the work is facilitated, it is possible to shorten the medical treatment time and to delegate the work to an unskilled person, and the productivity is dramatically improved.

That is, with the gingival retraction device of the present invention, gingival retraction can be performed easily and surely without suffering pain or gingival damage, and it is also possible to reduce the number of hospital visits, so that productivity and quality of dentistry Will be realized together.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a tray having a strip-shaped projection provided along the lengthwise direction on the inside of a side wall, and FIG. 2 is a perspective view showing an example of a gingival excluding device according to the present invention. FIG. 3 to FIG. 5 are explanatory views showing a situation when applying a gingival excluding device using a tray having band-shaped projections. FIG. 3 is before pressing, FIG. 4 is at the end of pressing, and FIG. Shows the situation immediately after removing the gingival excluding device after the end of pressing. 1 ... Tray, 1a ... Strip-shaped projection, 1b ... Through hole, 2 ...
Rubber compound with yield characteristics, 3 ... Crown-formed teeth, 4 ... Gingiva, 5 ... Formation limit

Claims (2)

[Claims] 1. A gingival excluding device in which a tray having a groove-shaped cross section with or without through holes in a wall layer is filled with a rubber compound having a yielding property. 2. A tray having a groove-shaped cross section with or without through holes in the wall layer, wherein a tray provided with strip-shaped protrusions along the lengthwise direction inside the side wall is filled with a rubber compound having a yield property. Gingival expulsion device