JPH04174662A - Material and method for gum exclusion - Google Patents

Abstract

PURPOSE:To provide a gum exclusion agent expanded and set by water kneading for a short time and having so excellent fluidity as to flow in and get to fit the tooth forming surface and gum crevice by setting the agent with water kneading and composing the agent of alginate impressing material expanded during setting and a foaming agent. CONSTITUTION:A muddy gum exclusion material kneaded with water is adapted to flow into a gum crevice 6, cover the periphery of an abutment tooth or teeth and surround the side edge gum 5 from the inside and outside of the gum crevice 6. After left as it is for some time, the gum exclusion material excludes the side edge gum 5 outward downward while expanding and completes the setting after 2-3 minutes. After this condition is further left as it is for 2-3 minutes, the side edge gum 5 is excluded sufficiently. An effect of excluding the gum is sufficiently kept during an operation by the viscoelasticity proper to the side edge gum 5 even after the removal of the gum exclusion material 7. Also, the set gum exclusion material 7 can be very simply removed in a body by tweezers or fingers without giving any pains to a patient since it has proper elasticity.

Description

Detailed Description of the Invention (Field of Industrial Application) This invention relates to a gingival exclusion material used in dental treatment, and also to a gingival exclusion method for excluding marginal gingiva using the gingival exclusion material. be.

(Prior Art) In dental treatment, there are many opportunities to set the edge of the tooth forming surface below the gingival margin due to the presence of caries over a wide area. For example, in the case of cast crown restoration (crown/inlay) treatment, when performing the impression-taking operation, the marginal gingiva should be sufficiently retracted and the margin of the tooth preparation surface should be clearly defined. This is important in improving the precision of restoration of the tooth preparation surface margin and preventing the occurrence of dental caries and periodontitis.

However, conventionally, the method shown in FIG. 4 has been the only method for excluding marginal gingiva in clinical practice. That is, Fig. 4 is a cross-sectional view of the tooth portion in the tooth ring direction showing the conventional method of gingival retraction, in which (1) is the abutment tooth or tooth, (2) is the alveolar bone, and (3) is the pulp. , (4) is the gingiva,
(5) is the marginal gingiva which is the edge of the gingiva (4), (6) is the gingival sulcus between the abutment tooth or tooth (1) and the marginal gingiva (5), and (10) is the gingival sulcus. (6) Cotton thread press-fitted inside;
(11) is a cotton thread press-fitting instrument for press-fitting the cotton thread (10) into the gingival sulcus (6). As shown in Figure 4, the conventional method of excluding the gums involves using cotton thread of an appropriate thickness (
10) into the gingival sulcus (6) using the cotton thread press-fitting instrument (11).
) was press-fitted with manual finger pressure.

(Problems to be Solved by the Invention) The conventional method of gingival exclusion using cotton thread uses artificial force during exclusion, which causes pain to the patient and may damage the marginal gingiva and cause bleeding. In addition, there are disadvantages such as the complicated and time-consuming press-fitting operation, and the lack of stability and certainty for gingival evacuation. An alternative method has been awaited.

This invention was made in order to eliminate the drawbacks of the above-mentioned conventional method of press-fitting a cotton thread into the gingival sulcus by artificial force, and provides a completely new material for gingival retraction, as well as a material for gingival retraction. The purpose of the present invention is to provide a novel method for excluding gingiva using a material.

(Means for Solving the Problems) The gingival exclusion material according to the present invention is a material that hardens by mixing with water and expands by itself during hardening. This material consists of a mixture of an alginate impression material and an intumescent material, and the intumescent material may be a water-absorbing intumescent material such as seaweed, which expands when it absorbs water, in powder form, or a foaming agent such as hydrogen carbonate. A substance that generates a gas when it reacts with water, such as sodium and an acidic substance, is used.

The gingival retraction method according to the present invention involves mixing the above-mentioned gingival retraction material with water, covering the marginal gingiva, waiting for it to expand and harden, and then removing the gingival retraction material from the marginal gingiva. It is characterized by this.

(Function) The gingival exclusion material of the present invention expands and hardens in a short time when mixed with water and has good fluidity, so it blends well and flows into the tooth forming surface and gingival sulcus.

Further, in the gingival exclusion method of the present invention, the gingival exclusion material surrounds the marginal gingiva from the inside and outside of the gingival sulcus, and expands and hardens over time, thereby spreading the marginal gingiva. As a result, the gingival sulcus becomes enlarged and its base becomes clear.

(Example) Examples of the present invention will be described in detail below.

The gingival exclusion material according to the present invention is hardened by mixing with water,
A mixture of an alginate impression material and a powdered water-absorbing swelling material, such as powdered seaweed such as wakame, or a mixture of an alginate impression material and a blowing agent, such as sodium bicarbonate, which expands on its own during hardening. Mixtures of materials consisting of powdered acids, or mixtures of alginate impression materials and powdered water-swelling materials, such as powdered seaweed such as seaweed, and blowing agents, such as sodium bicarbonate and powdered acids. It is formed from a mixture.

Alginate impression material is a fluid impression material that hardens in a short time when mixed with water, and it blends well into the tooth forming surface and the details inside the gingival sulcus and flows into it. On the other hand, the powdered water-absorbing and expanding material added to this alginate impression material expands approximately 14 to 15 times by weight in an extremely short period of time when water is added to it, and the powdered foaming agent When moisture is added, a reaction starts and hydrogen dioxide is generated in a very short period of time, and together these act to increase the volume of the alginate impression material.

Therefore, in this material, that is, a material made of an alginate impression material with a powdered water-absorbing and expanding material and/or a powdered foaming agent, by blending the ingredients in appropriate proportions and kneading with water, one of these ingredients was added. All of these materials expand and harden within a short period of time, ie, within 2 to 3 minutes. As a result of examining this compounding ratio from a clinical perspective, we found that the compounding ratio of alginate impression material and powdered water-absorbing and expanding material should be approximately 10:1 by weight in order to obtain the actually required displacement amount and operability. It was confirmed that the mixing ratio of the alginate impression material and the foaming agent was approximately 20.1 by weight. In addition, the temperature of the water during kneading affects the curing time and amount of expansion, but in any case, as with the case of kneading ordinary alginate impression materials, water with not very high humidity, such as ice water, At the same time, it was confirmed that the intended purpose could be fully achieved by using something like this.

Furthermore, depending on the type of expanding material used, there are cases where a powdered material that expands when it absorbs water, such as wakame seaweed, is used as an expanding material, and cases where it reacts with water and becomes a gas, such as sodium bicarbonate and acidic materials. It was also observed that there was a slight difference in the properties of the gingival retraction material when a powdered foaming agent was used as the expansion material. This is because a gingival retraction material that uses a foaming agent as an intumescent material starts engraving earlier after mixing with water than a gingival retraction material that uses a water-absorbing and expanding material such as seaweed as an intumescent material, but This means that the strength of the material is slightly lower.

Therefore, when making a gingival exclusion material, if the above two types of expanding materials are mixed in an appropriate ratio as an engraving agent to be added to the alginate impression material, the result will be different from when each expanding material is applied alone. Also, different properties can be obtained. In this case, when we applied the mixture at a ratio of about 3 parts of the water-absorbing and expanding material to 1 part of the foaming agent, the gingival exclusion material started to expand when it had good fluidity, and its physical strength increased. A favorable result was obtained in which the effect of gingival retraction was further enhanced.

Next, the method and operation of gingival retraction in this invention will be specifically described based on FIGS. 1 to 3.

That is, each of FIGS. 1 to 3 is a cross-sectional view of a tooth portion in both axial directions showing the state of gingival retraction according to the present invention, and FIG. 1 shows an embodiment of the present invention at the time of restoration of a cast tooth crown. , FIG. 2 shows an embodiment of the present invention during a filling procedure, and FIG. 3 shows an embodiment of the present invention when performing a tartar removal procedure, which is the same as FIG. 4 showing the conventional case described above. Or corresponding parts are given the same reference numerals.

After mixing the gingival retraction material with water, the slurry is poured into the gingival sulcus (6) and placed around the abutment tooth or tooth (1) to cover the marginal gingiva (5) with the gingival structure. (6) from the inside and outside (see Figures 1a to 3a). When left in this state for some time, the gingival exclusion material excludes the expanded marginal gingiva (5) outward and downward, and hardening is completed after 2 to 3 minutes. If this state is then left for another 2 to 3 minutes, the marginal gingiva (5) will be sufficiently retracted (see Figures 1b to 3). The gingival retraction effect is maintained sufficiently during the surgery even after the gingival retraction material (7) is removed due to the inherent viscoelasticity of the marginal gingiva (5).

In addition, the hardened gingival retraction material (7) is very easy to remove, and because it has moderate elasticity, it can be removed in one piece with tweezers or fingers without causing pain to the patient. The hemostatic effect (5) was also observed.

In the above examples, it is clear that the gingival retraction material is an alginate impression material and powdered seaweed, or powdered material that meets the purpose and effect of the present invention.

Next, an example of clinical application will be explained.

Mu” Island” Autumn” Casting dental crown restoration (crown/inlay)
Regarding treatment (see Figure 1) When performing a cast restoration treatment that includes the subgingival margin of the tooth formation surface, it is recommended to retract the marginal gingiva (5) before taking an impression ( Figure 1a), the edge of the tooth preparation surface is clearly defined (Figure 1b), and bleeding is also prevented, giving a clear impression of the edge of the preparation surface of the abutment tooth or tooth (1). It is possible to obtain a cast body with excellent precision.

viX! ! Li: Regarding filling treatment (see Figure 2) When filling the subgingival cavity (8), if the marginal gingiva (5) is excluded in advance (Figure 2a), the cavity The edges of (8) are clearly defined (FIG. 2b) and bleeding is also prevented, allowing reliable filling operation.

1.1: When performing tartar removal treatment, see Fig. 3) When removing tartar (9), if the marginal gingiva (5) is excluded (Fig. 3 a), the subgingival It becomes easier to visually recognize the presence of tartar (9) (Fig. 3b), and the hemostasis effect on the marginal gingiva (5) due to exclusion reduces the amount of bleeding when the marginal gingiva (5) is damaged by the scaler. is significantly reduced, making stone removal operations easier.

(Effects of the Invention) As described above, according to the gingival exclusion material and the gingival exclusion method of the present invention, gingiva can be excluded depending on the viscoelasticity inherent to the gingiva.

As a result, the depth of the gingival sulcus is not increased by artificial forcing, and the material and method of the present invention can truly be said to be a new gingival exclusion technique that emphasizes living tissue. This will make it easier and more reliable to perform the gingival retraction operations required in major dental clinics such as fillings, impressions, and stone removal, which will greatly contribute to improving the quality of dental care as a whole. The effect is extremely large.

[Brief explanation of the drawing]

1 to 3 are all cross-sectional views of the tooth portion in the self-axis direction showing the state of gingival retraction according to the present invention, and FIG. The figure shows an embodiment of the present invention during a filling treatment, and Fig. 3 shows an embodiment of the present invention when performing tartar removal. This shows the state of gingival retraction where the material has been engraved and hardened. FIG. 4 is a sectional view of a tooth portion in the autoaxial direction showing a conventional method of gingival retraction. In addition, the same reference numerals in the figures indicate the same or equivalent parts, and (1
) is the abutment tooth or tooth, (5) is the marginal gingiva, (6) is the gingival sulcus, (7) is the gingival retraction material, (8) is the cavity, (9)
(10) is a cotton thread, and (11) is a cotton thread press-fitting device.

Claims (7)

[Claims] (1) A gingival exclusion material characterized by being made of a material that hardens by mixing with water and expands during hardening. (2) The gingival exclusion material according to claim 1, wherein the material is composed of an alginate impression material and a water-absorbing expansion material. (3) The gingival exclusion material according to claim 1, wherein the material is composed of an alginate impression material and a foaming agent. (4) The gingival retraction material according to claim 1, wherein the material is composed of an alginate impression material, a water-absorbing swelling material, and a foaming agent. (5) The gingival exclusion material according to claim 2 or 4, wherein the water-absorbing and expanding material is made of powdered seaweed. (6) The gingival exclusion material according to claim 3 or 4, wherein the foaming agent comprises sodium hydrogen carbonate and an acidic substance. (7) A method for gingival exclusion, characterized in that the above-mentioned gingival exclusion material is kneaded with water, applied to the marginal gingiva, and removed from the marginal gingiva after waiting for the gingival exclusion material to harden.