WO2024070323A1 - 歯科用の石膏組成物 - Google Patents

歯科用の石膏組成物 Download PDF

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Publication number
WO2024070323A1
WO2024070323A1 PCT/JP2023/029929 JP2023029929W WO2024070323A1 WO 2024070323 A1 WO2024070323 A1 WO 2024070323A1 JP 2023029929 W JP2023029929 W JP 2023029929W WO 2024070323 A1 WO2024070323 A1 WO 2024070323A1
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WO
WIPO (PCT)
Prior art keywords
gypsum
dental
gypsum composition
slurry
model
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2023/029929
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English (en)
French (fr)
Japanese (ja)
Inventor
璃奈 小原
成泰 熊谷
秀平 黒岩
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yoshino Gypsum Co Ltd
Original Assignee
Yoshino Gypsum Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yoshino Gypsum Co Ltd filed Critical Yoshino Gypsum Co Ltd
Priority to KR1020247035871A priority Critical patent/KR20240167893A/ko
Priority to JP2024549869A priority patent/JP7811411B2/ja
Publication of WO2024070323A1 publication Critical patent/WO2024070323A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C11/00—Dental articulators, i.e. for simulating movement of the temporo-mandibular joints; Articulation forms or mouldings
    • A61C11/08—Dental articulators, i.e. for simulating movement of the temporo-mandibular joints; Articulation forms or mouldings with means to secure dental casts to articulator
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24—Macromolecular compounds
    • C04B24/38—Polysaccharides or derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
    • C04B28/145—Calcium sulfate hemi-hydrate with a specific crystal form

Definitions

  • the present invention relates to a dental gypsum composition that is used, for example, when placing and fixing a dental model on an articulator.
  • Gypsum powder is highly safe and functional, and is widely used, for example, as a dental material for obtaining various models required for making so-called dentures.
  • One of the uses of dental gypsum compositions is to place and fix dental models in an articulator.
  • An articulator is a device that reproduces the jaw movement and bite position by attaching plaster models made by taking impressions of the upper and lower teeth.
  • prosthetic devices such as dentures to treat missing teeth
  • it is used to check whether the bite of the prosthetic device is in good condition. Specifically, the dentures being made are actually bitten down using an articulator to check the condition, and then the prosthetic device is fine-tuned to improve the bite.
  • Patent Document 1 a dental gypsum powder capable of preparing a gypsum slurry with high consistency and excellent buildability is proposed, stating that a gypsum slurry with high consistency and excellent buildability is desired in order to reproduce the details of the oral cavity and to create a three-dimensional model.
  • a dental gypsum powder containing 0.5 to 3 parts by mass of gypsum dihydrate, 0.05 to 3 parts by mass of potassium sulfate, and 0.1 to 1 part by mass of a water-soluble saccharide per 100 parts by mass of gypsum hemihydrate has been proposed.
  • a gypsum slurry with high consistency and excellent buildability can be prepared.
  • the gypsum slurry is said to exhibit thixotropy, which shows low fluidity when left to stand and high fluidity when vibration or load is applied.
  • the present inventors recognized that it is important to develop a dental gypsum composition with unprecedented properties suitable for applications such as those described below, and that this would be an effective means of contributing to the advancement of dental technology.
  • an articulator is used to reproduce the jaw movement and bite position, and fine adjustments are made to the prosthetic device depending on the condition.
  • One of the tasks that dental technicians and others need to perform in this case is to attach a model of the patient's teeth taken from the articulator and reproduce the bite in the mouth.
  • a gypsum composition When mounting a model on the articulator, a gypsum composition is also used.
  • the following two performances are required for dental gypsum compositions used to mount a model on an articulator.
  • the gypsum composition in order to mount the model in the correct position, the gypsum composition is required to have a hardness that prevents the model from sinking until the slurry hardens when the model is placed in the specified position on the articulator using a slurry made by adding water to the gypsum composition.
  • the gypsum composition is required to have a slurry obtained by adding water that has the desired hardness and appropriate fluidity (working time).
  • the object of the present invention is therefore to provide a dental gypsum composition that overcomes the above-mentioned problems, for example, a gypsum composition for use in dentistry when a model is attached to an articulator.
  • a gypsum composition for use in dentistry when a model is attached to an articulator.
  • water is added to the gypsum composition to form a slurry, which is used to place a model or the like in a desired position, the model or the like does not sink and has a hardness that allows it to be stably placed in the desired position, and at the same time, the slurry has the desired hardness and appropriate fluidity (working life) to achieve good workability.
  • a dental gypsum composition comprising gypsum hemihydrate and pregelatinized starch.
  • the above-mentioned dental gypsum composition preferably has the following composition.
  • a dental gypsum composition that has a hardness that allows the model, etc. to be maintained in a stable position without sinking when the gypsum composition is made into a slurry by adding water to the gypsum composition, which is required for a dental gypsum composition when a model is attached to an articulator, and when the model, etc. is placed in a desired position using the slurry, the slurry has a desired hardness and appropriate fluidity (working time) that allows good workability.
  • FIG. 1 is a schematic diagram showing a state in which a slurry 1 made by adding water to the dental gypsum composition of the present invention is piled on a base 2 of an articulator 10.
  • FIG. 2 is a schematic diagram showing a state in which a model is placed on the articulator 10 in the state of FIG. 1, and a slurry 1 made by adding water to the dental gypsum composition of the present invention is hardened to set a model 3.
  • the present inventors have been studying dental gypsum compositions that have a hardness that allows the model, etc. to remain stably placed in the desired position without sinking when the slurry 1 is used to place the model 3 in the desired position by adding water to the gypsum composition, and at the same time, allow the slurry to have the desired hardness and appropriate fluidity (working life) to achieve good workability, and have arrived at the present invention.
  • the pregelatinized starch that characterizes the present invention may be, for example, one made from at least one selected from the group consisting of potato, corn, wheat, and tapioca.
  • Pregelatinized starch is a starch obtained by rapidly dehydrating and pulverizing a liquid in which starch has been gelatinized without aging.
  • Pregelatinized starch is also called ⁇ -starch, pregelatinized starch, pregel, and instant starch. When starch is heated with water, the starch molecules lose their regularity and become pasty (alpha-like). This is called gelatinization (gelatinization).
  • Pregelatinized starch has the characteristic of dissolving in water and reproducing a viscous paste.
  • the pregelatinized starch used in the present invention is preferably made from potato, corn, wheat, or tapioca. Among them, pregelatinized starch made from potato is particularly preferable because excellent effects can be obtained with a small amount added.
  • the amount of pregelatinized starch added is preferably within the range of 0.01 to 0.3 parts by mass per 100 parts by mass of hemihydrate gypsum.
  • the desired properties aimed at in the present invention can be obtained more effectively and stably in the range of 0.01 to 0.1 parts by mass, or even in the range of 0.03 to 0.1 parts by mass, per 100 parts by mass of hemihydrate gypsum.
  • the desired properties aimed at in the present invention can be obtained more effectively and stably in the range of 0.05 to 0.3 parts by mass per 100 parts by mass of hemihydrate gypsum.
  • pregelatinized starch made from potato it is desirable to add as little pregelatinized starch as possible, so from the standpoint of economy, it is preferable to use pregelatinized starch made from potato.
  • the dental gypsum composition of the present invention is characterized in that it uses hemihydrate gypsum in combination with the above-mentioned pregelatinized starch.
  • hemihydrate gypsum either ⁇ -type hemihydrate gypsum or ⁇ -type hemihydrate gypsum can be used, and both may be appropriately mixed and used.
  • the ⁇ -type hemihydrate gypsum has the advantage that the amount of water required for hardening is less than that of ⁇ -type hemihydrate gypsum, and the strength is high when hardened.
  • the dental gypsum composition of the present invention it is preferable to use the hemihydrate gypsum (both ⁇ -type and ⁇ -type) after pulverization so that the specific surface area of the hemihydrate to be used is about 1000 to 9000 cm 2 /g.
  • the specific surface area is the value of the specific surface area measured with a Blaine air permeation device specified in JIS R 5201.
  • the dental gypsum composition of the present invention is used as a slurry by adding mixing water, and therefore, in addition to gypsum hemihydrate, a setting time adjuster may be added as necessary.
  • a setting time adjuster may be added as necessary.
  • general hardening accelerators such as gypsum dihydrate and potassium sulfate can be added to accelerate the hardening of gypsum.
  • general hardening retarders such as sodium citrate and potassium tartrate can be added to delay the hardening of gypsum.
  • a known setting time regulator was appropriately mixed to adjust the basic performance so that the pot life of the slurry would be about 5 to 10 minutes.
  • the above "pot life" was determined as follows. The gypsum composition was mixed with mixing water to create a slurry, which was then left to stand for 15 seconds in a rubber bowl and mixed for 15 seconds, and the process was repeated. The pot life was determined as the time when the fluidity decreased, that is, the viscosity of the slurry increased, and it became impossible to use it for dental work. Specifically, in this study, the pot life was determined as the time from when the worker added water to the gypsum composition to prepare the slurry to when it became impossible to pile the slurry 1 onto the base 2 of the articulator 10 as shown in Figure 1.
  • the gypsum composition used in the study was mixed with mixing water (the point at which water was added is considered "wet") to produce a slurry that was mixed under the following set of conditions to prevent differences in the amount of water that would affect the consistency, or differences due to the mixing conditions. Specifically, a set amount of water for mixing was measured out into a dental rubber bowl, the gypsum composition powder was added to it over 30 seconds, and the mixture was mixed (stirred) for 60 seconds (up to 1 minute and 30 seconds after the start of adding the gypsum composition powder). A special spatula with a blade tip of 13-20 mm and a blade length of 95-105 mm was used for mixing, and the stirring speed was kept constant at 100 rpm.
  • each mixed slurry was weighed into a ring with an inner diameter of ⁇ 40 mm and a height of 60 mm placed on the top surface of glass plate A (the operation was to be completed within 2 minutes after contact with water), and then the ring was lifted to gently pour the slurry onto the top surface of glass plate A (2 minutes 30 seconds). Then, 3 minutes after contact with water, a square glass plate B with a length and width of 11 cm and a weight of 150 g was placed on the slurry poured onto glass plate A, and the size of the hardened gypsum body that was spread into a circle was measured and used as the consistency.
  • the arithmetic mean value of the maximum and minimum diameters of the hardened body in contact with the top surface of glass plate A was used as the consistency.
  • the consistency obtained as described above is shown in Table 1.
  • a product with a consistency of less than 70 mm was considered to be a pass product and indicated with a circle.
  • a product with a consistency of 70 mm or more was considered to be a fail product and indicated with a cross.
  • the “pot life” in Table 1 is a value measured by the following method. That is, mixing water was added to the gypsum composition under study, and the slurry was mixed under the above conditions. The slurry was left to stand for 15 seconds in a rubber bowl, and then mixed for 15 seconds. This process was repeated until the fluidity decreased (the viscosity of the slurry increased) and it became impossible to pile the slurry onto the base of the articulator. This was taken as the pot life.
  • the blending amount of pregelatinized starch was changed stepwise from 0.01 parts by mass to 0.30 parts by mass relative to 100 parts by mass of hemihydrate gypsum, and tests were conducted. In order to adjust the consistency, the amount of mixing water was increased as the blending amount of pregelatinized starch increased, as shown in Table 2.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Epidemiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Dentistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Dental Preparations (AREA)
PCT/JP2023/029929 2022-09-26 2023-08-21 歯科用の石膏組成物 Ceased WO2024070323A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020247035871A KR20240167893A (ko) 2022-09-26 2023-08-21 치과용 석고 조성물
JP2024549869A JP7811411B2 (ja) 2022-09-26 2023-08-21 歯科用の石膏組成物

Applications Claiming Priority (2)

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JP2022152300 2022-09-26
JP2022-152300 2022-09-26

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WO2024070323A1 true WO2024070323A1 (ja) 2024-04-04

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JP (1) JP7811411B2 (https=)
KR (1) KR20240167893A (https=)
TW (1) TW202415352A (https=)
WO (1) WO2024070323A1 (https=)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08107906A (ja) * 1994-10-11 1996-04-30 Kiyotaka Osato 咬合器及びその石膏型取付方法
JP2010515605A (ja) * 2007-01-10 2010-05-13 ズィー コーポレイション 改良された色、物品性能及び使用の容易さ、を持つ３次元印刷材料システム
WO2014034525A1 (ja) * 2012-08-27 2014-03-06 吉野石膏株式会社 高膨張石膏組成物の製造方法および該製造方法で得られた高膨張石膏組成物
CN112194446A (zh) * 2020-09-27 2021-01-08 荆门千年健医疗保健科技有限公司 石膏铸造成型方法、石膏成型产品及应用

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6120547A (ja) * 1984-07-06 1986-01-29 而至歯科工業株式会社 歯科鋳造用埋没材
JPS63141906A (ja) * 1986-12-03 1988-06-14 G C Dental Ind Corp 歯科鋳造用埋没材
JP2017055850A (ja) 2015-09-14 2017-03-23 大成歯科工業株式会社 歯科用石膏粉末

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08107906A (ja) * 1994-10-11 1996-04-30 Kiyotaka Osato 咬合器及びその石膏型取付方法
JP2010515605A (ja) * 2007-01-10 2010-05-13 ズィー コーポレイション 改良された色、物品性能及び使用の容易さ、を持つ３次元印刷材料システム
WO2014034525A1 (ja) * 2012-08-27 2014-03-06 吉野石膏株式会社 高膨張石膏組成物の製造方法および該製造方法で得られた高膨張石膏組成物
CN112194446A (zh) * 2020-09-27 2021-01-08 荆门千年健医疗保健科技有限公司 石膏铸造成型方法、石膏成型产品及应用

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JP7811411B2 (ja) 2026-02-05
KR20240167893A (ko) 2024-11-28
JPWO2024070323A1 (https=) 2024-04-04
TW202415352A (zh) 2024-04-16

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