Method for preparing alginate impression material

Abstract

To prevent a suction failure occurring when using a hardening material pack hardened by being stored for a long period of time in an unused state or in a use interrupted state in a method of preparing an alginate impression material by setting, in a kneading device, a base material pack formed by enclosing a base material paste containing an alginate and the hardening material pack formed by enclosing a hardening material paste containing a hardening agent, sucking a prescribed amount of the paste from each pack with a pump, and then mixing both pastes.SOLUTION: A preparation method of an alginate impression material includes: using a vibration imparting device including a housing configured to be held with one hand and a vibration motor stored inside the housing, where a part of the housing is composed of a diaphragm with a convex curved surface, the vibration imparting device vibrating the diaphragm by driving the vibration motor; moving the diaphragm in a vibrating state while pressing it against an outer surface of the hardening material pack; and transmitting the vibration to a hardening material paste inside the hardening material pack to fluidize the paste.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention provides a method for preparing an alginate impression material using a kneading device that sets a base paste pack and a hardener paste pack and kneads the base paste and hardener paste in these packs. to Regarding. [Background technology]

[0002] Alginate impression materials are commonly used to take impressions of teeth for dental restoration. Alginate impression materials utilize the fact that a gel-like hardened body is obtained when the base material, alginate, and the hardener, calcium sulfate, are kneaded with water. A kneading device for preparing alginate impression materials by kneading a base paste and a hardener paste enclosed in separate packs has also been put to practical use (see Patent Documents 1 and 2). Such kneading devices for preparing alginate impression materials (hereinafter also referred to as "kneading devices") generally have a structure as shown in Figures 1 and 2 (corresponding to Figures 1 and 3 in Patent Document 1, respectively). A hardener pack and a base pack, both in the form of "spout-equipped pouch packaging," are set in a holder, and the pastes enclosed in each pack are quantitatively sucked and discharged by a first pump and a second pump, respectively, and kneaded in a stirring section. The kneaded alginate impression material is then discharged from a discharge nozzle onto a dedicated tray.

[0003] Base pastes typically contain alginate as the main component, to which diatomaceous earth and water are added. Hardener pastes typically contain hardeners such as calcium sulfate and water-insoluble liquid compounds such as liquid paraffin, which are necessary for forming the paste, as well as components for adjusting the hardening time and improving storage stability. Specifically, preferred pastes include hardeners such as calcium sulfate and magnesium oxide to shorten the hardening time; potassium fluorotitanate, phosphates, and zinc oxide to finely adjust the hardening time; surfactants to maintain a constant hardening time; bulking agents such as diatomaceous earth, silica, titania, and alumina, which are inactive inorganic powders with an average particle size of 0.5 μm or more; and anti-settling agents such as ultrafine inorganic powders with an average primary particle size of 0.1 μm or less, such as silica, titania, and zirconia, which prevent the settling of powder particles during long-term storage (see Patent Document 3: JP-A-9-315924). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6054610 specification [Patent Document 2] International Publication No. 2013 / 187415 Brochure [Patent Document 3] Japanese Patent Application Publication No. 9-315924 Summary of the Invention [Problem to be solved by the invention]

[0005] The hardener paste disclosed in Patent Document 2 has excellent storage stability, in that the hardening time does not delay when kneaded with alginate, which is the base material, even when stored for a long period of time.

[0006] However, according to the studies of the present inventors, due to long-term storage or storage conditions of the hardener pack, for example, high temperatures, (1) when the hardener pack is stored unused for a long period of time and then used, or (2) when the pack that has been stored in this manner is opened and set in the kneading device and used, and then stopped for a while, and then used again after a long interval, for example, more than one week, it has become clear that there may be cases where the hardener paste is difficult to aspirate and kneading does not go well (see the comparative example described below).

[0007] Therefore, an object of the present invention is to provide a technique that enables the alginate impression material to be prepared satisfactorily using the kneading device even in the cases of (1) and (2) above. [Means for solving the problem]

[0008] The present invention solves the above problems, and shape The device comprises a "first holder" for holding a base pack consisting of a spouted pouch package in which a base paste containing a salt of alginic acid with a monovalent cation and water is sealed inside a flexible bag having a spout; a "second holder" for holding a hardener pack consisting of a spouted pouch package in which a hardener paste containing a hardener made of calcium sulfate and a poorly water-soluble liquid compound is sealed inside a flexible bag having a spout; an "agitator main body" and an "agitating unit" having "first and second inlets" provided on the upstream side of the agitator main body and an "exhaust outlet" provided on the downstream side of the agitator main body; a "exhaust nozzle" connected to the outlet of the agitator unit; and a "second holder" held by the first holder. The aforementioned a "first pipe" connecting the spout of the base pack and the first inlet of the stirring unit; and a "second pipe" held by the second holder. The aforementioned A "second pipe" that connects the spout of the hardener pack and the second inlet of the stirring unit; a "first pump" that is disposed in the first pipe and sucks and discharges the base paste in the base pack; and a "first pump" that is disposed in the second pipe, The aforementionedA "second pump" that sucks and discharges the hardener paste in the hardener pack; and a "kneading device" having The base material pack and the hardener pack are set in the first holder and the second holder, respectively, and the first pump, the second pump, and the agitator body are driven to mix the base material and the hardener pack. Pa A method for preparing an alginate impression material, comprising: supplying a base paste in a pack and a hardener paste in the hardener pack to the stirring section; kneading the supplied pastes in the stirrer body to prepare an alginate impression material; and discharging the prepared alginate impression material from the discharge nozzle. Before driving the first pump, the second pump, and the agitator body, The device has a housing that can be held in one hand and a vibration motor housed inside the housing, and a part of the housing is configured as a vibration plate having a convex curved surface. Using a vibration device The vibration motor is driven to vibrate the vibration plate, and the vibration plate in the vibrated state is brought into contact with the flexible bag of the hardener pack, thereby transmitting vibration to the flexible bag and the hardener paste therein. hand, before This is a method for preparing an alginate impression material, characterized in that a vibration treatment is carried out to apply vibration to the hardener paste.

[0009] In the method for preparing the alginate impression material of the above form (hereinafter also referred to as "the preparation method of the present invention"), it is preferable that the base paste further contains diatomaceous earth and water, and the hardener paste contains magnesium oxide; at least one selected from the group consisting of potassium fluorotitanate, phosphoric acid, phosphates, and zinc oxide; a surfactant; an inorganic powder having an average particle size of 0.5 μm or more, which is at least one selected from the group consisting of diatomaceous earth, silica, titania, and alumina; and silica powder having an average primary particle size of 0.1 μm or less.

[0011] Furthermore, in an aspect in which the vibration imparting device is used, it is preferable that the vibration imparting process be carried out by: a first vibration imparting process in which the vibrating vibrating plate of the vibration imparting device is pressed against the flexible bag of the hardener pack while moving over the entire area or almost the entire area of the surface of the flexible bag to impart vibration to the entire or almost the entire hardener paste; and a second vibration imparting process in which, after the first vibration imparting process, the vibrating plate of the vibration imparting device is brought into contact with a position on the surface of the flexible bag far from the spout and pressed against it while moving the vibrating plate toward the spout, thereby imparting vibration to the hardener paste in the hardener pack and moving the hardener paste toward the spout.

[0012] In addition, A vibration imparting device for imparting vibration to paste inside a spouted pouch package in which paste is sealed inside a flexible bag having a spout, the vibration imparting device comprising: a housing that can be held in one hand; and a vibration motor housed inside the housing; a part of the housing is configured as a vibration plate having a convex curved surface; the vibration imparting device is characterized in that the vibration plate is vibrated by driving the vibration motor; and the vibration is transmitted to the flexible bag and the paste therein by bringing the vibration plate in a vibrated state into contact with the flexible bag. of Hereinafter, this will also be referred to as the "vibration imparting device of the present invention." 。 [Effects of the Invention]

[0013] According to the preparation method of the present invention, even in the cases of (1) and (2) described above, an alginate impression material having a desired curing time can be easily and reliably prepared using a kneading device for preparing an alginate impression material. Furthermore, the vibration imparting device of the present invention makes it possible to easily perform the vibration imparting process in the preparation method of the present invention. [Brief explanation of the drawings]

[0014] [Figure 1]This figure is a front perspective view of a kneading device that is preferably used in the preparation method of the present invention. [Figure 2] This figure is a schematic diagram of the main parts of the kneading apparatus shown in Figure 1. [Figure 3] 1 is a front perspective view showing an embodiment of a vibration imparting device of the present invention. [Figure 4] This figure is an assembly drawing (schematic drawing) of the vibration imparting device shown in FIG. [Figure 5] This figure is the first diagram for explaining how to use the vibration imparting device shown in FIG. [Figure 6] This figure is the second diagram for explaining how to use the vibration imparting device shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] The inventors conducted research to solve the above-mentioned problems and found that when the hardener paste becomes difficult to suck in as in (1) and (2) above, the hardener pack (the paste contained therein) feels slightly hard, that if the hardener pack is removed from the kneading device and then thoroughly kneaded by hand (hereinafter, kneading by hand will also be referred to simply as "hand kneading") and then reattached and used, it becomes possible to prepare an alginate impression material, and that if an attempt is made to continue using the pack after wearing it in this way, it will again become difficult to suck in the next day (interval: 1 day), and that to resolve this, it will be necessary to knead it by hand again (see the reference example described below).

[0016] Further research was conducted into ways to extend the duration of the above-mentioned effects, and it was discovered that if vibrations generated by a vibration motor were applied to the hardener pack (and thus the paste contained therein) instead of kneading by hand, not only would it be possible to prepare an alginate impression material in a short period of time, but the duration of the effects would also be extended, leading to the completion of the present invention.

[0017] The reason for this effect is not entirely clear, but it is presumed to be due to the following reasons. Specifically, regarding the cause of the poor suction described above, even when the hardener pack was stored for a long period of time, once the hardener paste inside was fluidized by applying an external force, its viscosity remained the same as before storage. Therefore, it is believed that the ultrafine inorganic powder particles (average primary particle diameter of 0.1 μm or less) added as an anti-settling agent aggregated during long-term storage and lost their function, causing the dispersion state of the powder components to change, resulting in a decrease in the fluidity of the paste and making it difficult to suction the hardener paste. Furthermore, it is believed that the vibration generated by the hand kneading or vibration motor homogenized the powder components of the paste, restoring the fluidity of the hardener paste and making it possible to suction it. Furthermore, while hand kneading does not provide a long-lasting effect, using a vibration motor improves the long-lasting effect. This is because the former (hand kneading) does not break down the agglomerates of ultrafine particles that have aggregated once, and the powder components are not fully dispersed and restored, causing the powder components to become non-uniform in a short period of time. On the other hand, the latter (use of a vibration motor) allows the ultra-fine particle agglomerates to be broken down (partially, if not completely) and re-dispersed as ultra-fine particles, which makes it possible to suppress the non-uniformity of the powder components for a certain period of time, thereby prolonging the duration of the effect.

[0018] The preparation method of the present invention is a conventional method for preparing an alginate impression material using a kneading device, characterized in that before starting the kneading device, a vibration imparting device is used to apply vibration to the hardener paste inside the flexible bag of the hardener pack from the outside. Therefore, the kneading device, base paste and its pack, and hardener paste and its pack used can be those that have been conventionally used without any particular restrictions.

[0019] Therefore, first, these will be briefly explained, and then the vibration imparting device (including the vibration imparting device of the present invention) used in the vibration imparting process and the vibration imparting method using the same will be described in detail below. In this specification, unless otherwise specified, the notation "x to y" using numerical values x and y means "greater than or equal to x and less than or equal to y." In such notation, when a unit is assigned only to the numerical value y, the unit is also applied to the numerical value x.

[0020] 1. Kneading device A kneading apparatus 1 suitable for use in the preparation method of the present invention is shown in Figures 1 and 2. The kneading apparatus 1 shown in Figure 1 includes a base 1a having a generally triangular shape in side view with the upper surface inclined upward and forward, and a hardener pack 2 containing a hardener paste and a base pack 3 containing a base paste, which are installed in the center of the upper surface of the base 1a and tilted so as to face diagonally upward and rearward. A pack mounting section 4 is attached to the front of the base 1, and the outer peripheral surface excluding the upper surface of the base 1 is covered with a removable cover 5. As shown in the schematic diagram of FIG. 2, inside the base 1, which has an opening at the front, there is a first pump 6 for discharging the hardener paste, a first motor 7 for driving the first pump 6, a second pump 8 for discharging the base paste, a second motor 9 for driving the second pump 8, and a stirring unit 10 for kneading the base paste and hardener paste fed by the first and second pumps 6 and 8, and a stirring motor 11 for driving a bladed stirring rod (not shown) housed in the stirring unit 10 (the bladed stirring rod and the stirring motor 11 constitute the mixer body). In the kneading apparatus shown in the figure, the first (2) pump 6 (8) has a structure in which its drive shaft 13 is connected to the rotating shaft 22 of the first (2) motor 7 (9) by a belt 23, thereby being driven by a motor, but the drive system is not limited to this.

[0021] The first pump 6 and the second pump 8 are gear pumps such as a Trochoid Pump (registered trademark), and the pumps 6 and 8 are attached to the upper front portions of the inner surfaces of the left and right side plates of the base 1a so that they are aligned on the left-right axis and face each other across the agitator 10. The suction holes 14 formed in the first pump 6 and the second pump 8 are connected to the lower ends of paste injection pipes 16, which are attached to the front portion of the top surface of the base 1, and into which outlets (pouring spouts) 15 at the lower ends of the hardener pack 2 and the base material pack 3 are inserted.

[0022] The first motor 7 and the second motor 9 are mounted symmetrically on the inner surfaces of the lower rear portions of the left and right side plates 1b so as to be parallel to the first and second pumps 6 and 8 in a plan view, and so as to be aligned on the left-right axis.

[0023] To produce an alginate impression material using such a kneading device, first, the upper and lower ends of the hardener pack 2 and the base pack 3 are held and set by two upper holders 24 and two lower holders 25 provided on the front side of the pack mounting unit 4, and then the spouts (pouring spouts) 15 at the lower ends of each pack 2, 3 are inserted into the paste injection tube 16 attached to the front of the upper surface of the base 1. Next, when the start switch (not shown) is operated to start the operation of the kneading device, the first motor 7 and the second motor 9 are operated, and the first pump 6 and the second pump 8 driven by both motors 7 and 9 are operated simultaneously. Then, the hardener paste and the base paste enclosed in the hardener pack 2 and the base pack 3 are sucked from the suction hole 14 by the first pump 6 and the second pump 8, respectively, and discharged from the discharge hole 19 into the paste feed path 18 in the left and right piping blocks 17, and fed to the stirring chamber 20 of the stirring unit 10 to join together. The feed amounts of the hardener paste and base paste, i.e., their mixing ratio, are appropriately set in advance by electrically controlling the rotation speed or operating time of the first motor 7 and the second motor 9 using a control means.

[0024] The hardener paste and base paste fed to the stirring unit 10 are mixed in the stirring chamber 20 by rotating a bladed stirring rod with a stirring motor 11. The impression material produced by this mixing is pushed downward and discharged from a discharge nozzle 10a at the bottom of the stirring unit 10, and is used as a dental alginate impression material.

[0025] 2. Base paste and its pack, and hardener paste and its pack As described above, the base paste generally used is one that contains alginate as the main component and to which diatomaceous earth and water are added. Furthermore, the hardener paste generally contains a hardener such as calcium sulfate, and a poorly water-soluble liquid compound such as liquid paraffin required for pasting, as well as components for adjusting the hardening time and improving storage stability. Such base pastes and hardener pastes can also be used without any particular restrictions in the preparation method of the present invention.

[0026] Among these, from the viewpoint of ease of availability and ease of handling, a base paste containing 3.0 to 9.5 parts by mass of sodium alginate and / or potassium alginate and 13 to 20 parts by mass of diatomaceous earth per 100 parts by mass of water is preferably used, and a hardener paste containing 180 to 250 parts by mass of calcium sulfate (gypsum), 20 to 40 parts by mass of magnesium oxide, 2 to 30 parts by mass of at least one selected from the group consisting of potassium fluorotitanate, phosphoric acid, phosphates, and zinc oxide, 13 to 20 parts by mass of a surfactant, 25 to 45 parts by mass of at least one inorganic powder selected from the group consisting of diatomaceous earth, silica, titania, and alumina, and having an average particle size of 0.5 μm or more, and 8 to 15 parts by mass of silica powder having an average primary particle size of 0.1 μm or less per 100 parts by mass of liquid paraffin is preferably used.

[0027] Preferably, the at least one selected from the group consisting of potassium fluorotitanate, phosphoric acid, phosphates, and zinc oxide contains phosphoric acid or a phosphate, and the surfactant preferably contains polyoxyethylene phenyl ether, polyoxyethylene oleyl ether, decaglyceryl oleate, or the like.

[0028] These base pastes and hardener pastes are commercially available as spouted pouch packages sealed inside flexible bags with spouts for use in kneading devices, and packs made of such packages are preferably used in the present invention.

[0029] 3. Vibration imparting device (vibration imparting device of the present invention) As a vibration imparting device for performing the vibration treatment in the preparation method of the present invention, the vibration imparting device of the present invention, i.e., a vibration imparting device for applying vibration to the paste inside a spouted pouch package in which paste is sealed inside a flexible bag with a spout, characterized in that it has a housing that can be held in one hand and a vibration motor housed inside the housing, a part of the housing is formed of a vibration plate with a convex curved surface, the vibration motor is driven to vibrate the vibration plate, and the vibration is transmitted to the flexible bag and the paste inside it by abutting the vibration plate in the vibrated state against the flexible bag.

[0030] The vibrating device of the present invention will be described below with reference to the drawings. Fig. 3 shows a perspective view of a vibrating device 100 of the present invention that can be used in a preferred embodiment, Fig. 4 shows a (schematic) assembly diagram, and Fig. 5 shows a schematic diagram illustrating a usage mode. The vibrating device 100 shown in these figures includes a housing 110 that can be held in one hand and a vibration motor 130 that is supported and housed within an internal space 120 of the housing. The housing 110 is composed of a front cover 111 and a back cover 113, which are screwed together to form the housing. The front cover 111 is composed of a diaphragm 111a having a convexly curved main surface, and two finger restraints 111b are provided on the sides as concave recesses with a moderate curvature (having a non-slip mechanism on the front) facing each other to be held between fingers when holding the device in the hand (see the photograph on the left side of Fig. 5). Furthermore, a switch mounting portion 112, which is a notch for mounting a switch 140, is provided near one of the cover members. On the other hand, rear cover 113 has a structure in which a flat body having an opening and battery box 121 with an opening at the top are integrated (so that the opening becomes the opening of the battery box), and the opening is covered by flat battery box cover 114 that can be slid and attached / detached. A battery (not shown) installed in battery box 121 can supply driving power to vibration motor 130 via switch 140 by internal wiring.

[0031] The shape of the convex curved surface of diaphragm 111a constituting the main surface of front cover 111 is not particularly limited, but is preferably a hemispherical egg-like shape (the curved surface shape when an egg is cut in half lengthwise). The overall shape of housing 110 of vibration imparting device 100 shown in the figure resembles the appearance of a so-called "mouse" for operating a computer, which has two finger restraints facing each other on its sides. When the "mouse" is turned over and held in one hand with fingers placed on the two finger restraints (corresponding to finger restraint 111b) so that the sliding surface faces the palm, the hemispherical egg-like convex curved surface (which would normally contact the palm of a mouse) exposed (facing away from the palm) corresponds to diaphragm 111a. Note that resins such as polycarbonate, ABS, and polyacetal are preferably used as materials for the components constituting housing 110, due to their ease of molding processability.

[0032] Vibration motor 130 includes a motor body and a vibrating arm fixed to the output shaft of the motor body, and vibrations generated by eccentric rotation of the vibrating arm vibrate diaphragm 111a. Vibration motor 130 has the motor body housed in a cylindrical vibration-proof cover 131 and fixed to support member 115 integrally molded on the back surface of diaphragm 111a (the surface facing main body internal space 120), so that vibrations caused by rotation of the vibrating arm are reliably transmitted to diaphragm 111a.

[0033] Any commercially available vibration motor having the above structure can be used as the vibration motor 130, for example, one that can generate vibrations of about 2500 times per minute or more, without any particular restrictions. However, from the standpoint of effectiveness, it is preferable to use one that can generate vibrations of about 4500 to 9000 times per minute, and particularly about 6000 to 8000 times per minute.

[0034] 4. Vibration treatment (vibration application) method The vibration treatment in the preparation method of the present invention is preferably carried out by driving the vibration motor of the vibration imparting device to vibrate the vibration plate, and then abutting the vibrating plate in the vibrated state against the flexible bag of the hardener pack to transmit the vibration to the flexible bag and the hardener paste inside it.

[0035] In this case, because the effect can be more reliably obtained, it is preferable to perform the vibration treatment by (1) a first vibration treatment (see FIG. 5) in which the vibrating plate of the vibration treatment tool is pressed against the flexible bag of the hardener pack and moved over the entire or substantially entire surface of the flexible bag to vibrate the entire or substantially entire hardener paste, and (2) a second vibration treatment (see FIG. 6) in which, after the first vibration treatment, the vibrating plate of the vibration treatment tool is brought into contact with a position on the surface of the flexible bag far from the spout and pressed against it while moving the plate toward the spout, thereby vibrating the hardener paste in the hardener pack and moving the hardener paste toward the spout. The treatment time for each of the vibration treatments can be set appropriately, but good effects can be obtained by performing each treatment for about 5 to 10 seconds.

[0036] The vibration treatment, including the first and second vibration treatments, not only enables the suction and discharge of hardener paste from a hardened hardener pack, but also serves as a means of squeezing hardener paste from a hardener pack with only a small amount remaining. For example, when a hardener pack is used infrequently and left for a long period of time with only about one-third of the remaining paste remaining, squeezing it has traditionally required removing the pack from the device, plugging it, kneading it by hand, and then scraping the flexible bag surface with a spatula or the like toward the spout to collect it, which was time-consuming and took several minutes. In contrast, the vibration treatment described above makes it possible to perform the treatment in just a few tens of seconds while the pack is still attached to the device. The reduction in processing time is essentially the same for squeezing a base pack (base paste) with only a small amount remaining. [Example]

[0037] The present invention will be explained in more detail below with reference to examples, but the present invention is not limited to these examples.

[0038] Comparative Example 1 An attempt was made to prepare an alginate impression material using a kneading device (Tokuyama Dental Co., Ltd. AP Mixer III) having a structure similar to that shown in FIG. 1, and a base material pack and a hardener pack (Tokuyama Dental Co., Ltd. Tokuyama AP-1). At this time, four hardener packs manufactured on the same day and stored in a warehouse for 300 days after manufacture were prepared as hardener packs. Two of them were sequentially attached to the kneading device and preparation was attempted, but the hardener paste was not aspirated and discharged from the hardener pack, and the preparation of the alginate impression material could not be adjusted. At this time, the two hardener packs used (No. 1 and 2) were removed from the device after confirming the preparation state and used in Reference Examples 1 and 2. Then, the remaining two hardener packs (No. 3 and 4) were attached to one of the two kneading devices prepared and preparation was attempted. In either case, the hardener paste was not aspirated and discharged, so the kneading device was stopped, and Examples 1 and 2 described below were performed.

[0039] Example 1 For the No. 3 hardener pack, after attempting preparation in Comparative Example 1, the kneading apparatus was temporarily stopped, and the vibration imparting device shown in FIG. 3 was used to perform the first vibration imparting process shown in FIG. 5 and the second vibration imparting process shown in FIG. 6 at a vibration of 7500 times / min for 15 seconds, and then the kneading apparatus was started and the preparation of the alginate impression material (preparation on the day of treatment) was attempted, and it was possible to adjust without any problems. In addition, after preparation, the apparatus was stopped and left as it was for one day, and the kneading apparatus was started again to prepare the alginate impression material. When this cycle was repeated, it was possible to adjust without any problems up to three days after treatment, but after four days of treatment, pulsation was observed in the discharge state and stable preparation could not be performed.

[0040] Example 2 For the No. 4 hardener pack, after attempting preparation in Comparative Example 1, the kneading device was temporarily stopped, and the vibration imparting device shown in Figure 3 was used to perform the first vibration imparting process and the second vibration imparting process at a vibration of 2500 times / min for 5 seconds each, and then the kneading device was started and the preparation of the alginate impression material (preparation on the day of treatment) was attempted, and adjustment was possible without problems. In addition, after preparation, the device was stopped and left as it was for 1 day, and the kneading device was started again to prepare the alginate impression material. When this cycle was repeated, adjustment was possible without problems until 1 day after treatment, but 2 days after treatment, pulsation was observed in the discharge state and stable preparation could not be performed.

[0041] Reference example 1 Regarding the No. 1 hardener pack used in Comparative Example 1 and removed from the kneading device, the lid was put on and then kneaded by hand for 30 seconds, and then reattached to the kneading device to attempt preparation of the alginate impression material (preparation on the day of treatment). Pulsation was observed in the discharge state, and although the preparation itself was possible, stable preparation could not be performed. After that, the device was stopped and restarted the next day, and an attempt was made to prepare the alginate impression material (preparation one day after treatment). The hardener paste was not suctioned and discharged, and preparation could not be performed.

[0042] Reference example 2 The No. 2 hardener pack used in Comparative Example 1 and removed from the kneading device was kneaded by hand for 90 seconds after the lid was closed, and then reattached to the kneading device to prepare an alginate impression material (preparation on the day of treatment). When this was attempted, preparation was possible without any problems. After that, the device was stopped and restarted the next day to attempt preparation of an alginate impression material (preparation one day after treatment). Pulsation was observed in the discharge state, and stable preparation was not possible. [Explanation of symbols]

[0043] 1: kneading device, 1a: base, 2: hardener pack, 3: base material pack, 4: pack mounting part, 5: cover, 6: first pump, 7: first motor, 8: second pump, 9: second motor, 10: stirring part, 10a: discharge nozzle, 11: stirring motor, 13: drive shaft, 14: suction hole, 15: outlet, 16: paste injection pipe, 17: piping block, 18: paste delivery path, 19: discharge hole, 20: stirring chamber, 2 2: Rotating shaft, 23: Belt, 24: Upper holder, 25: Lower holder, 100: Vibration imparting device, 110: Housing, 111: Front cover, 111a: Vibration plate, 111b: Finger restraint, 112: Switch mounting portion, 113: Back cover, 114: Battery box cover, 115: Support member, 120: Main body internal space, 121: Battery box, 130: Vibration motor, 131: Anti-vibration cover, 140: Switch

Claims

1. a first holder for holding a base pack comprising a spouted pouch package in which a base paste containing a salt of alginic acid with a monovalent cation and water is sealed inside a flexible bag having a spout; a second holder for holding a hardener pack comprising a spouted pouch package in which a hardener paste containing a hardener made of calcium sulfate and a poorly water-soluble liquid compound is sealed inside a flexible bag having a spout; and a stirring unit having a stirrer body, first and second inlets provided on the upstream side of the stirrer body, and a discharge port provided on the downstream side of the stirrer body; a discharge nozzle connected to the discharge port of the stirring unit; a first pipe connecting the spout of the base pack held by the first holder to the first inlet of the stirring unit; a second pipe connecting the spout of the hardener pack held by the second holder to the second inlet of the stirring unit; a first pump disposed in the first pipe and configured to suck and discharge the base paste in the base pack; A kneading apparatus having a second pump disposed in the second piping and sucking and discharging the hardener paste in the hardener pack, In a method for preparing an alginate impression material, the base material pack and the hardener pack are set in the first holder and the second holder, respectively, and the first pump, the second pump, and the agitator main body are driven to supply the base material paste in the base material pack and the hardener paste in the hardener pack to the agitator, and the supplied pastes are kneaded by the agitator main body to prepare an alginate impression material, and the prepared alginate impression material is further discharged from the discharge nozzle. Before driving the first pump, the second pump, and the agitator main body, a vibration imparting device is used, which has a housing that can be held in one hand and a vibration motor housed inside the housing, with a part of the housing being a vibration plate with a convex curved surface, and the vibration motor is driven to vibrate the vibration plate, and the vibration plate in the vibrated state is brought into contact with the flexible bag of the hardener pack, thereby transmitting vibration to the flexible bag and the hardener paste therein, thereby performing a vibration imparting process to impart vibration to the hardener paste. A method for preparing an alginate impression material, comprising:

2. 2. The method for preparing an alginate impression material according to claim 1, wherein the base paste further contains diatomaceous earth and water, and the hardener paste contains magnesium oxide; at least one selected from the group consisting of potassium fluorotitanate, phosphoric acid, phosphates, and zinc oxide; a surfactant; an inorganic powder having an average particle size of 0.5 μm or more, the inorganic powder consisting of at least one selected from the group consisting of diatomaceous earth, silica, titania, and alumina; and a silica powder having an average primary particle size of 0.1 μm or less.

3. The method for preparing an alginate impression material according to claim 1, wherein the vibration treatment is carried out while the hardener pack is set in the first holder.

4. a first vibration application process in which the vibrating vibration plate of the vibration application tool is pressed against the flexible bag of the hardener pack and moved over the entire or substantially entire surface of the flexible bag to apply vibration to the entire or substantially entire hardener paste; After the first vibration application process, the vibrating plate of the vibration application device is brought into contact with a position on the surface of the flexible bag far from the spout, and the vibrating plate is moved toward the spout while pressing the surface, thereby vibrating the hardener paste in the hardener pack and moving the hardener paste toward the spout. A second vibration application process is performed. The method for preparing an alginate impression material according to claim 1, wherein the vibration treatment is carried out by

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