JPH02307443A - Sampling of impression and impression material - Google Patents

Abstract

PURPOSE:To make an operation simple and to shorten a manufacturing time by making a model from an impression after sampling and transferring a wax artificial tooth made of the model as personal tray to an occluding impression. CONSTITUTION:An impression material is a resin with a relative viscosity of 1.15-2.80 wherein a polycaprolactone resin is a main component and is used by heat-melting. A heater 18 is a product wherein hot plates 19a and 19b furnished inside with each a heating member by energizing electricity are faced each other and are opened and closed around a hinge 21 as a center and it is heated up to max. 105 deg.C so as to heat rapidly the shape molding material at 72-82 deg.C. A tray contg. a required amt. of the impression material 27 is put in the heater 18 and dry heating is performed by closing the hot plates 19a and 19b. The powdery shape molding material is melted by heating in a body. The impression material is taken out and is made into a rod-like shape along the tray 20. The tray is inserted in a mouth and is abuted to a specified position under pressure. After curing, the impression material is taken out from the mouth and whether the abuted position under pressure of the tray is proper or not is judged. In addition, excess impression material is removed, while a supplementary filling is performed to an insufficient area.

Description

[Detailed description of the invention] [Purpose of the invention] "Industrial application field" The present invention relates to a method for taking impressions for dentures and an impression material.

In particular, the present invention relates to a method for producing an impression for a denture, which is difficult to obtain with any of the impression materials currently used in clinical dentistry, and an impression material that allows a complete denture impression to be accurately taken using a simple method.

``Conventional technology'' A conventional example is ``Impression taking of an edentulous jaw,'' by Takashi Sato, published November 1, 1986, Publisher: Jishi Dental Industry Co., Ltd., ``What is required of a complete denture manufacturing model?''"Dental Technique Tube 16 Volume 6, 4 No. 3, pages 274 to 293,
There are pages 398 to 408 of issue 4. With reference to these, an example of a conventional method for taking an impression for a denture will be described below for a mandibular impression.

(1) Tray selection and correction are performed. This selection is made by measuring the distance between the posterior molar tuberosities on both sides using a divider, etc.
Measure the distance between the median alveolar crest and the posterior edge of the posterior molar tubercle using a dental mirror handle, and use these measurement results to select the most suitable tray. To correct the tray, insert the selected tray into the oral cavity, check the fit, mark the appropriate length, cut and remove the appropriate length using scissors, and smooth the cut surface with a paper cone. Then bend the edges of the tray using Gorton pliers to equalize the gap between the tray and the mucosa. Insert the tray into the oral cavity, check the fit, and prepare for placing the impression material.

(2) Prepare modeling compound. Conventional modeling compounds are mixtures of natural resins, synthetic resins, waxes, and fillers. Natural resins include copal, rosin, and shellac, synthetic resins include glyptal resin, L-wax resin, and wax. Examples include stearite, paraffin, beeswax, etc., and fillers include talc, mica powder, pigments, etc. One to several of these substances are selected and mixed. The modeling compound has a softening temperature of 75°C and a curing temperature of 42°C.
℃ and those with a softening temperature of 61°C and a hardening temperature of 44°C are often used.

(3) Place modeling compound in water bath and soften. If the softening temperature is too high, the impression material will stick to wet hands, and if it is too low, it will harden while being placed on a tray, so heat it to a high level so that it does not stick to your fingers.

(4) Make the softened modeling compound into a stick and place it on a tray. At this time, perform an abduction operation with your fingers so that the wrinkles gather on the tray side, and place the tray while referring to the fit of the tray to the oral cavity described above. At this time, it is important that no wrinkles remain on the top surface.

(5) Using an alcohol torch, soften the entire surface of the modeling compound on the tray. Since heating with an alcohol torch results in uniform wood, tempering is performed in a water bath in order to equalize the temperature and prevent it from sticking to the mucous membranes and skin.

(6) Insert the tray into the oral cavity and press it against the lower jaw. The intraoral pressure contact temperature of the modeling compound is lower than 55°C, but the temperature at the time of pressure contact, that is, the plasticity, depends on the degree of heating with an alcohol torch, the immersion time in the water bath, and the time until insertion into the oral cavity after removal from the water bath. Adjust according to the time etc. After pressing, wait for the modeling compound to harden.

(7) After the modeling compound has hardened, remove the tray from the oral cavity and check the appropriateness of the pressure contact position of the tray, that is, the deviation between the tray and the modeling compound, and the excess or deficiency of modeling compound at the edges of the impression. Delete part. However, if the above deviation, undersizing, or foot is large, start over from applying the modeling compound to the tray.

(8) Section deleted using alcohol torch again
- Soften the modeling compound in the area corresponding to the tuberosity area of the posterior molars, temper it in a water bath, insert it into the oral cavity and press it, and create the mouth opening, debulk, protrusion of the tongue,
Have the patient repeatedly make movements such as touching the left and right corners of the mouth or buccal mucosa with the tip of the tongue and lifting the tongue. This checks the suitability of the impression.

(9) Remove the tray from the oral cavity, use an alcohol torch to soften the excess area at the edge of the impression, add modeling compound to the area that is too small, insert the tray into the oral cavity again, press it, and make an impression. Repeat steps (8) above until the edges have a suitable size.

Formation of such an impression form is performed, for example, in the following order.

■ Remove excessive modeling compound from the right buccal area, buccal distal area, and posterior molar tubercle area, soften the removed area with an alcohol torch, and use a water bath to pick up the softened area and insert it into the oral cavity. , and have the patient repeatedly perform movements such as opening the mouth, sucking the cheeks, and closing the mouth. This forms the margin of the impression corresponding to the intraoral area.

■ Perform the left side edge formation in the same manner as in ■.

■ Remove the modeling compound corresponding to the labial area on both sides and the labial side of the lower lip area, soften the removed area with an alcohol torch, temper the softened area in a water bath, and insert the tray into the oral cavity. Apply pressure and repeatedly raise the lower lip or suction the lips.

■ Similarly, the modeling compound for the edges of the left cheek band, right cheek band, and lower lip band is formed by softening, tempering, pressing, and oral movement.

(10) Using the general impression completed through the above steps, plaster is removed to create a mandible.

(11) Create a personal tray for the lower jaw using the above plaster mold (detailed explanation omitted).

(12) Create a final impression using the individual tray.

As the impression material used for the final impression, in addition to the above-mentioned modeling compound, a two-component material such as an alginic acid base, a silicone base, a rubber base, etc. is used. The impression creation method is to mix the two components, knead them, arrange them on the inner surface of the tray, put the tray filled with the impression material into the oral cavity, press it together, and wait until the plasticity of the impression material has decreased before opening the mouth. , move the tongue forward, touch the left and right corners of the mouth or buccal mucosa with the tip of the tongue, lift the tip of the tongue, use the masseter closing muscle, suck the cheek, raise the lower lip, or suck the lips to respond to the tray. move it.

After waiting for the impression material to harden, the impression is removed from the oral cavity.

(10) Once the completed impression is completed, place a soft impression material on the completed impression and take an occlusal impression before starting the denture preparation.

Regarding the impression of the upper jaw, the impression is made using roughly the same method as described above, although some differences are made.

"Problem to be solved by the invention" In the above conventional example, (1) there are many steps from the general impression to the formation of the completed impression;
It takes an extremely long time and requires a lot of perioral movements during the short curing time, and is complicated because it is performed in several sessions, requiring many hospital visits for the patient and requiring a lot of time for doctors and dental technicians. The process is interrupted between the two, making management time-consuming.

(2) The fluidity (FLOW) of the outline impression is small, so the interbones are clearly visible, and there is no layer of mucous membrane on top of the hard bone.
It is difficult to obtain an impression of the mucous membrane in a properly deformed and adsorbed state, and the time from the softened state to the hardened state is short, so unless you are a skilled dentist, the part corresponding to the mylohyoid muscle line, for example, can be properly formed. difficult to create an impression of

(3) Even when looking only at the production of a general impression, it is difficult to produce it because the molding time of the modeling compound is short.

(4) Modeling compound softens in a water bath, but it is difficult to control the temperature to soften the modeling compound, and if left in a softened state, it will contain evaporation and deteriorate in quality, so it must be ready for use whenever a patient comes. cannot be maintained.

(5) Because it is a wet heating method, it feels hot to the hands and fingers, and it takes patience to handle it with hands and fingers during the initial heating.

(6) Modeling compound is not very strong, so it needs to be placed thickly on the tray.

(7) Both the modeling compound and the secondary impression material undergo deformation after curing, so a plaster model must be created as soon as possible.

(8) Adding modeling compound to missing areas is difficult as it may distort the impression of the manufacturing process, and it may be necessary to start over from the beginning.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the above-mentioned conventional examples and to provide a method for taking impressions for dentures that is easy to operate and takes a short time to create, and an impression material.

[Structure of the invention]

"Means for Solving the Problem" The first invention of the present application provides a method for taking an impression used in a denture manufacturing process, which has a relative viscosity of 1.15 to 2. Impression material whose main component is polycaprolactone resin with BO is (a) softened by heating and placed on a tray, (b) the tray is inserted into the oral cavity and pressed, and if necessary, slight movement around the oral cavity is performed. (c) remove the impression from the oral cavity after hardening, (d) remove the excess part of the impression and replenish the missing part, (e) reheat the desired part of the impression, and (f) insert the tray into the oral cavity. The impression is taken by repeatedly applying pressure and applying slight perioral movements if necessary. A model is made from the taken impression, and the wax denture made from this model is used as a personal tray for chewing. This is a method of taking impressions that is characterized by being able to transfer to sitting impressions.

The second invention of the present application is an impression material characterized by using a mixture whose main component is a polycaprolactone resin having a relative viscosity of 1.15 to 2.80, which is heated and melted.

“Example” An example of the present invention will be described below with reference to the drawings.

The process of making an impression in the present invention is characterized by selecting a tray, adding pressure to the impression material, placing the impression material on the tray, and making an impression using the impression material placed on the tray.
Creation of a general (-next) impression 1. The process proceeds to the occlusal impression in one impression creation process, rather than the three steps that are broadly divided into the creation of an individual tray and the creation of a final impression.

The impression material of the present invention is suitable for creating impressions of edentulous jaws, but can also provide suitable results for impressions of edentated animals.

The examples will mainly describe the creation of an impression of an edentulous mandible, which is the most difficult task, but before that, the names of various parts of an edentulous jaw will be described below.

FIG. 6 is a plan view of the inside of the mandible of an edentulous jaw, with the lower side of the figure being the opening of the oral cavity and the upper side being the throat side.

In the figure, % 1 is the lower lip subband, 2 is the labial area, 3 is the buccal subband, 4 is the clavicular area, 5 is the anterior edge of the mandibular attachment, 6 is the clavicular distal area and the posterior molar tuberosity area, 7 are the lingual distal region and the posterior mylohyoid fossa region, 8 is the anterior lingual alveolar sulcus region, 9 is the lingual subband, and 10 is the median alveolar crest, and the symmetrical parts with respect to the left and right have the same name.

FIG. 7 is a plan view of the inside of the edentulous upper jaw.

The upper part of the figure is the oral cavity opening, and the lower part is the throat.

In the figure, 11 is the upper lip subzone, 12 is the labial area, 1s is the buccal subband, 14 is the clavicular area, 15 is the clavicular distal area and the pterygomaxillary notch area, and 16 is the posterior ridge area.

FIG. 6 is a perspective view showing the mylohyoid muscle line. Mylohyoid line 1
7 is the origin of the mylohyoid muscle.

FIG. 9 is a perspective view of the alveolar ridge seen from the chain side, and 25 is an external diagonal line.

In the following explanation of the impression creation process, the same name as each name of the jaw may be used for impressions without specifically stating that they are impressions.

Impressions were taken as follows. Special items prepared in the present invention include an impression material and a heating device.

It is a resin whose main component is polycaprolactone resin having a relative viscosity of 1.15 to 2.80, and is used after being heated and melted.

The relative viscosity as used in the present invention is the viscosity measured using a capillary viscometer (Ubbelohde viscometer).

The measurement method was performed according to JIS K6726.

However, the value is measured at a concentration of toluene as a solvent of 1% and a temperature of 25°C plus or minus 0.05°C.

The polycaprolactone resin used in the present invention has a softening point of 50~
A thermosetting polycaprolactone resin having a temperature of 80°C and being solid at room temperature is produced as follows.

That is, it is obtained by ring-opening addition polymerization of a lactone monomer such as 8-caprolactone monomer in the presence of an initiator and a catalyst having an active hydrogen group.

The catalyst used in this reaction is generally an organic tin compound, an organic titanium compound, an organic tin halide compound, etc., and the amount used is 0.1 to 50% of the starting material.
00 ppm, preferably 10-100 ppm.

The reaction temperature is suitably 100 to 230°C, and preferably carried out in an inert gas atmosphere.

Commercial products of the above-mentioned impression materials include those manufactured by Daicel Chemical Industries, Ltd. (PCL-H series), for example. Polycaprolactone resin is characterized by good fluidity in a softened state. These products are usually in pellet form.

The physical properties of the above impression material are as follows.

(2) Softening temperature: 57-58°C (90% shortening rate) This is the softening temperature when the temperature of the sample is raised from 1 to 1.

■ Measurement of shortening rate at 45~50℃ A short cylindrical sample with a round bar of IQII and a length of 6t
When dry heating was carried out at 82°C and a load of 2 to f was applied for 10 minutes, the dimensional change rate was as follows: measured temperature (°C), shortening rate (chi).

■ Strength test results Impression material of the present invention Modeling compound compressive strength Vc
Wri 219±20 80±2 Yield strength (Kan-)7
8±747±1 Elastic modulus (x1o'Kp/i) 2.5f0.4
Regarding the strength of s, 2±a, and s, the values of the conventional modeling compound were used for comparison.

■ Comparing the curing time from 55°C to 40°C after heat conduction heating, impression material of the present invention: Modeling compound wet heating 252 seconds 145 seconds dry heating
It was 352 seconds. The wet method is when the sample is heated in a water bath, and the dry method is when the sample is heated without adding moisture. Dry heating of the modeling compound is impossible because it sticks to the heater and fingers. This curing period is the time during which the surgeon can handle the impression material, and since the present invention is mainly performed in a dry manner as described later, it takes more than twice as long to create an impression in one heating process compared to conventional modeling compounds. It can be used.

The resin used in the present invention described above may be used as it is, or may be colored with a coloring agent such as a pigment or dye, if necessary.

Figure 10 shows the heater.

The heater 18 includes a hot plate 19a equipped with an energized heating member inside;
19b facing each other and opening and closing centering on the hinge 21, the temperature can be raised up to a maximum of 105°C so that the impression material can be rapidly heated to 72 to 82°C.

Hereinafter, taking an impression of the lower jaw will be explained as an example. As shown in Figure 1 fa), (b), and (c), (1
) Select a tray. Select tray 20 using divider 2
The distance between the tuberosity areas 6 of the posterior molars is measured using a tool such as No. 2, and the distance between the median alveolar crest 10 and the edge of the tuberosity area 6 of the posterior molars is measured using a handle 23 of a dental mirror or the like. Based on the measurement results,
Select the optimal tray 20. In the present invention, tray 2
0 is used without modification.

Because of the fluidity of the impression material, it is possible to not only obtain a highly faithful impression of the mandible by taking two impressions;
This is because the impression margin can also be formed at the same time. In addition, impression materials have high strength after hardening and high fluidity when softened, so
There is no need for the tray to have such great strength.

(2) Place the required amount of impression material 27 (numerals omitted hereinafter) into the tray as shown in FIG. 10 in the heater 18ζζ.

The hot plates 19a and 19b are closed and dry heating is performed. As already mentioned, when the impression material of the present invention is dry-type, it takes a long time to harden and the operator can perform the treatment for a long time to obtain the desired impression, which is advantageous because the impression can be completed in a small number of times. By heating, the powder impression material melts and becomes a single piece. Unlike a water bath, which raises the water temperature and heats it up, it takes only a short time to complete the cooling process.

It is also possible to keep the impression material in a softened state by heating it in advance.

(3) Take out the impression material from the heater 18 and place it on the tray 2.
Make it into a bar shape along the 0 line. Unlike the modeling compound, the impression material of the present invention is less likely to wrinkle, so there is no need for manual manipulation to wrinkle the impression material inwardly (lower side) while abducting. Furthermore, since it has a low tendency to stick to fingers, molding can be started at a higher temperature, and in the case of a dry method, it is convenient because even at a higher temperature, the fingers do not feel hot.

(4) Arrange on tray 20 (Figure 2). Even after finishing the plating, the impression material has not hardened, so proceed to the next step.

(5) As shown in FIG. 3, insert the tray into the oral cavity and press it at a predetermined position 6ζ. Because the impression material has good fluidity, the shape is similar to that of a layer of mucous membrane on top of bone.
Mylohyoid muscle line 17 and others are transcribed as faithful numbers. At the same time, each area of the impression margin, lower lip subzone 1, lip side area 2, cheek subzone 5,
The margins of the clavicular region 4, the clavicular distal region and the posterior molar tuberosity region 6, the lingual distal region and the posterior mylohyoid muscle fossa region 7, and the anterior lingual alveolar sulcus region B1 and the lingual subband 9 are also formed.

Incidentally, depending on the form of the impression margin, a slight movement around the oral cavity may be added if necessary.

(6) After hardening, remove the impression material from the oral cavity and
0, and the excess or deficiency of the impression material at each part of the edge of the tray 20 mentioned above. The excess impression material on the lingual side of the fossa region 7 is removed (Fig. 4(a)), and the missing part is filled with replenishment. In the impression material of the present invention, the impression material of the replenishment plate and the impression material serving as the base material are easily fused and integrated, so the replenishment plate is easy. After refilling, each of the areas 7 and 8 deleted above
．． Alcohol torch 24 from 9 to posterior molar tuberosity area 6
(Fig. 4(b)).

(7) Press the tray 20 to a predetermined position in the oral cavity.

Then, depending on the shape of the impression margin, slight perioral movement is added as necessary. If the morphology of the surrounding tissue is not sufficiently transferred to the impression margin, the impression is softened and pressed repeatedly.

Unlike modeling compounds, there is no need for the patient to repeatedly open their mouth wide, bend down, protrude the tongue, touch the left and right corners of the mouth or the buccal mucosa with the tongue tip, and hold the tongue tip up.

(8) By repeating the same operations as above, the impression is completed when the edge of the impression material becomes the shape shown in FIG. 6.

In the present invention, there is no need to create individual trays between the first and second (final) impressions, and a plaster model (completed model) is made from the second impression (machine board impression), and wax dentures made from this melon are made. Proceed to take occlusal impressions as individual trays.

The above impression formation has been described for the lower jaw, but the same applies to the upper jaw.

Figure S (each figure) is the final completed model created using one impression of the lower jaw created as described above. As shown in FIG. 5(a), the mylohyoid muscle line 17 is clearly visible. Therefore, in models using conventional modeling compounds, it is difficult to clearly show the mylohyoid muscle line 17 and it is often difficult to determine the lingual edge; however, the length of the edge of the mylohyoid muscle line 17 is Can judge appropriately.

As shown in FIG. 5(b), part A of the chain side region 4 is visible using the external diagonal line 25 as a guide. Since the buccinator muscle runs back and forth, even if the denture base is slightly expanded, it will not directly cause the denture to lift, but it is desirable to have a model with a sufficient impression of this area. It has become.

As shown in FIG. 5(c), the small cheek area 3 is avoided. If this buccal subband δ is unclear and protrudes, it may cause not only an obstruction to tongue movement but also a decubitus ulcer. If conventional modeling compounds are used, the model after taking the occlusal impression may not be clear.

As shown in FIG. 5(d), since the tongue subband 9 that regulates tongue movement attaches to the tongue bulge, it is necessary to avoid it sufficiently so as not to interfere with tongue movement, but this is clearly shown. There is.

As shown in Fig. 5(c), it is considered desirable to cover half to thirds of the white open triangle 26 with the denture base, and when making a complete denture, the white open triangle 26 is removed on top of the denture. If not,
It cannot be said that it is a very impressive model. Therefore, it is one of the criteria for determining whether a model is good or not, and according to the present invention, it is easy to clearly express it.

〔Effect of the invention〕

The first invention of the present application is (1) making a model from the impression taken in the -th treatment,
Since the wax denture made from this model can be used as a personal tray and transferred to the occlusal impression, a model for making the personal tray is required as in the past, and a secondary impression (final impression) is taken using the personal tray. The treatment is simplified and the impression completed faster. Therefore, dentures can be manufactured more quickly, communication between doctors and dental technicians is reduced, and the number of hospital visits for patients is also reduced.

(2) Less discomfort is caused to the patient during the procedure.

(3) Because the curing time is long, intraoral manipulation is easy and highly accurate impressions can be taken. In addition, after the material has hardened, only the area to be adjusted is softened again using an alcohol torch, and unlike the conventional example, there is no possibility that the area to be adjusted cannot be immersed in a water bath.

(4) The impression that the back side is clearly visible and the impression that there is suction can be easily obtained.

(5) No special techniques are required.

(6) It is only necessary to select the tray, so the preparation time for impression taking is short.

(7) The impression material can always be prepared in a softened state, and the treatment can be performed in accordance with the patient's visit.

(8) It is not difficult to take impressions even in difficult cases where the alveolar ridge is severely contracted.

The impression material of the second invention of the present application (1) has low water absorption, so it does not deform even if left after operation (conventional examples deform due to water absorption, so a model must be prepared early).

(2) It can be mixed with some polymeric materials and has a wide range of applications.

(6) Good 4-shape (high fluidity when softened).

(4) The impression surface is rich and highly accurate impressions can be taken. Therefore, a model with abundant Ishiki model surfaces can be created.

(5) Peeling of the impression and plaster model is easy.

(6) - The next impression gives the impression that the back surface is clearly visible and that there is adhesion.

(7) Due to its high fluidity, the outer edge of the denture, which is necessary for wearing the denture, can be confirmed by impression.

(8) Dry heating does not stick to hands and fingers, so you won't feel hot at high temperatures.

(9) It is economical and can be used any number of times by reheating and can be sterilized by heating.

(10) The amount of material required for impression taking can be easily increased or decreased.

There are other effects.

[Brief explanation of drawings]

Figure 1 (al), Figure 1 (b), Figure 1 (c), Figure 2,
6, 4fa) and 4(b) are respectively perspective views of the embodiment of the present invention, FIGS. 5(a), 5(b), and 5(c1, Figure (d) and Figure 5 (e) are from Figure 1 (a) to
Figure 4(b) is a perspective view of a model created using the impression taken by the method; Figure 6 is a plan view of the edentulous mandible; Figure 7 is a plan view of the edentulous mandible;
The figure is a plan view of the edentulous upper jaw, Fig. 8 is a perspective view of the alveolar region seen from the lingual side, and Fig. 9 is a perspective view of the alveolar region seen from the chain side.
FIG. 10 is a perspective view of the heater. 1. Lower lip small band 2. Lip side area 3. Cheek small band 4
...Clavicular region 5..Anterior edge of mandibular attachment surface 6..Clavicular distal region and posterior molar tubercle region 7.φLingual distal region and posterior mylohyoid muscle fossa region 8..Anterior lingual alveolar sulcus region 9・・Tongue subband 10・・
Median alveolar crest 11... Upper lip small band 12... Labial area 1
3. Buccal subband 14. Lateral area 15. Distal area on the side of the chain and pterygomaxillary notch area 16. Posterior crest area 17. Mylohyoid muscle line 18. Heater 19a. 19b - Hot plate 20... Tray 21... Hinge 2
2. Divider 23.-Dental aluminum 5-4) Handle 24
・・Alcohol torch 25・・Outside diagonal line 26・・White triangle 27・・Impression material. Patent applicant: Daicel Chemical Industries, Ltd. M.D.E. Co., Ltd.

Claims (1)

[Claims] 1. In a method for taking an impression used in a denture manufacturing process, an impression material whose main component is a polycaprolactone resin having a relative viscosity of 1.15 to 2.80 is (a) softened by heating, Place it on a tray, (b) insert the tray into the oral cavity and press it, and if necessary, make slight movements around the oral cavity (c)
) Remove the impression from the oral cavity after hardening, (d) remove the excess part of the impression and replenish the missing part, (e) reheat the desired part of the impression, and (f) insert the tray into the oral cavity and mainly apply pressure. ,
The impression method is to repeatedly add slight perioral movements as necessary, and a model is made from the impression after taking, and the wax denture made from this model can be used as a personal tray and transferred to the occlusal impression. A method of taking impressions characterized by: 2. An impression material characterized by being used by heating and melting a mixture whose main component is a polycaprolactone resin having a relative viscosity of 1.15 to 2.80.