KR0120544B1 - Dental plaster powder - Google Patents
Dental plaster powderInfo
- Publication number
- KR0120544B1 KR0120544B1 KR1019930026968A KR930026968A KR0120544B1 KR 0120544 B1 KR0120544 B1 KR 0120544B1 KR 1019930026968 A KR1019930026968 A KR 1019930026968A KR 930026968 A KR930026968 A KR 930026968A KR 0120544 B1 KR0120544 B1 KR 0120544B1
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- KR
- South Korea
- Prior art keywords
- powder
- ceramic powder
- dental
- added
- dental ceramic
- Prior art date
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/08—Artificial teeth; Making same
- A61C13/082—Cosmetic aspects, e.g. inlays; Determination of the colour
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/08—Artificial teeth; Making same
- A61C13/083—Porcelain or ceramic teeth
- A61C13/0835—Ceramic coating on metallic body
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- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Dentistry (AREA)
- Epidemiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Dental Preparations (AREA)
Abstract
Description
본 발명은 작업성이 개선된 치과용 도재분말에 관한 것이다. 더욱 상세하게는 금속 또는 귀금속틀에 원하는 형상으로 축성하여 치아형태를 정교하게 만들기 위하여 응집제를 첨가하여 작업성을 개선시킨 치과용 도재분말에 관한 것이다.The present invention relates to a dental ceramic powder having improved workability. More specifically, the present invention relates to a dental ceramic powder which is improved in workability by adding a flocculant in order to refine a tooth shape by forming a metal or precious metal frame in a desired shape.
일반적으로 인공치아 제작을 위한 치과용 도재분말은 금속 또는 귀금속 틀위에 축성하는 순서에 따라 오페이크(opaque)도재, 덴틴(dentine)도재, 에나멜(enamel)도재로 구분되며, 인공 치아 제작방법을 금속틀 위에 우선 오페이크 도재를 0.1내지 0.2㎜로 균질하게 입혀서 소성한 후, 그 위에 상아질 도재와 에나멜 도재를 도재 축성 전용액 또는 증류수로 혼합하여 크림상으로 만든 다음 붓으로 정교한 치아형태로 축성한 후 소성하여 만들어지게 된다.Generally, dental ceramic powder for artificial tooth manufacturing is divided into opaque ceramic, dentine ceramic, and enamel ceramic according to the order in which it is built on the metal or precious metal frame. First of all, the opaque porcelain is coated homogeneously with 0.1 to 0.2mm on the mold and then fired.The dentin porcelain and enamel porcelain are mixed with porcelain layering solution or distilled water, and then made into a cream form. It is made by firing.
상기와 같이, 도재분말을 붓으로 축성시 액체로 혼합된 분말이 모양을 유지하지 못하고 흘러내리거나 무너지게 되면, 정교한 모양의 치아형태를 제작하기 어려우므로 붓으로 슬러리상의 분말을 금속틀 위에 입힐 때, 원하는 형태로 유지하게 할 필요가 있다.As described above, when the powder mixed with the liquid does not maintain its shape when the ceramic powder is made with a brush and flows down or collapses, it is difficult to produce a precisely shaped tooth shape. You need to keep it in the form you want.
이러한 축성시의 작업성을 향상시키기 위하여 종래의 알려진 방법으로는 도재분말의 평균입경, 입도분포만을 조절하였으나, 이 방법만으로는 한계가 있으며, 금속틀 위에 축성시 작업이 크게 향상되지 않으므로 붓으로 정교한 모양의 인공치아를 제조하기가 어려웠다.In order to improve the workability at the time of layering, conventionally known methods control only the average particle size and particle size distribution of ceramic powder, but this method has its limitations. It was difficult to manufacture artificial teeth.
그 이유는 분말과 액체 혼합계에서 유동특성 및 점토특성은 주로 입자의 표면특성, 즉 표면 전하에 따른 입자들의 분산, 응집현상에 좌우되기 때문이다.This is because the flow characteristics and clay characteristics in the powder and liquid mixing system depend mainly on the surface characteristics of the particles, that is, the dispersion and aggregation of the particles due to the surface charge.
따라서, 본 발명은 이와 같은 종래의 문제점을 해소시키기 위하여 통상의 방법으로 제조된 도재분말에 응집제 성분을 첨가시켜 분말의 유동성을 감소시킴으로써 인공 치아제조시 흘러내리지 않아 정교하게 원하는 모양으로 쉽게 제조가 가능한 치과용 도재분말을 제공하는데 그 목적이 있다.Therefore, the present invention can be easily manufactured in a precisely desired shape by adding a flocculant component to the ceramic powder prepared by a conventional method to reduce the fluidity of the powder to reduce the fluidity of artificial teeth in order to solve such a conventional problem. The purpose is to provide dental ceramic powder.
이하 본 발명을 상세히 설명하기로 한다.Hereinafter, the present invention will be described in detail.
본 발명은 통상의 방법으로 제조된 치과용 도재분말에 틱소트로피특성을 나타내는 황산 알루미늄, 황산 마그네슘, 황산 칼슘, 염화 암모늄, 염화칼슘, 수산화칼슘 및 염산으로 이루어진 그룹으로부터 선택된 적어도 하나의 응집제를 0.01 내지 0.25중량%, 바람직하기로는 0.04 내지 0.08중량%를 첨가하여서 된 작업성이 개선된 치과용 도재분말인 것이다.The present invention is 0.01 to 0.25% by weight of at least one flocculant selected from the group consisting of aluminum sulfate, magnesium sulfate, calcium sulfate, ammonium chloride, calcium chloride, calcium hydroxide and hydrochloric acid exhibiting thixotropic properties to the dental ceramic powder prepared by a conventional method %, Preferably 0.04 to 0.08% by weight of the dental ceramic powder improved workability.
이와 같은 본 발명을 더욱 상세히 설명하면 다음과 같다.Referring to the present invention in more detail as follows.
본 발명을 작업성이 개선된 금속 소부용 치과용 도재분말에 대한 것으로, 종래와 같이 작업성의 개선을 위해 도재분말의 평균입경 및 입도분포만을 조절하는 방법 이외에 추가로 틱소트로피 특성을 보이는 응집제를 첨가시킴으로써 도재분말과 액체의 슬러리 상태에서 입자들이 부드럽게 뭉쳐진 상태로 존재하게 되고, 분말의 유동성이 감소하게 되며, 그로 인해 도재축성시 흘러내리지 않으므로 정교하게 원하는 형상의 치아제작이 가능하게 된다.The present invention relates to a dental ceramic powder for metal working with improved workability, and in addition to a method of controlling only the average particle diameter and particle size distribution of the ceramic powder to improve workability as in the prior art, a flocculant showing thixotropy is added. By doing so, the particles are present in a smoothly aggregated state in the slurry state of the ceramic powder and the liquid, and the flowability of the powder is reduced, thereby allowing the manufacture of a precisely desired tooth because it does not flow down during the ceramic veneering.
본 발명에 따르면, 응집제로는 2가 양이온 또는 강한 음이온성 응집제를 선택사용하며, 예를들어, 황산 알루미늄, 황산 마그네슘, 황산 칼슘, 염화 암모늄, 염화칼슘, 수산화 칼슘 및 염산으로 이루어진 그룹으로부터 선택된 적어도 하나가 바람직하다. 이중에서 특히 바람직한 응집제로는 황산 알루미늄, 황산 마그네슘 또는 수산화 칼슘이다.According to the present invention, as the flocculant, a divalent cation or a strong anionic flocculant is selected and used, for example, at least one selected from the group consisting of aluminum sulfate, magnesium sulfate, calcium sulfate, ammonium chloride, calcium chloride, calcium hydroxide and hydrochloric acid. Is preferred. Particularly preferred flocculants among these are aluminum sulfate, magnesium sulfate or calcium hydroxide.
본 발명에서의 응집제는 틱소트로피 특성을 보이게 되는데 이에 대해 설명하면 다음과 같다.In the present invention, the flocculant shows thixotropy characteristics, which will be described below.
즉, 액체내에서 입자들의 침강속도는 스토크의 법칙(storke's Law)에 따라 중력의 영향하에서 입자크기가 침강속도에 영향을 미치게 된다.In other words, the sedimentation velocity of the particles in the liquid affects the sedimentation velocity of the particle size under the influence of gravity according to Stork's Law.
미세한 입자들은 입자표면에 이온을 흡착하며, 흡착된 이온의 형태(음이온 또는 양이온)에 따라 표면특성이 달라지게 되며, 이에 따라 같은 이온을 갖는 인접 입자들끼리 서로 반발하여 몰어지게 되고, 다른 이온을 갖는 입자들끼리는 서로 끌어당겨 달라붙게 된다. 즉 해교제(Deflocculant)를 첨가하면 입자들간에 서로 반발력을 갖게 되어 액체내에서 입자들이 균질하게 분산되고, 웅집제(Flocculant)를 첨가하면, 반대현상을 나타내어 미세한 입자들이 뭉쳐서 침전물을 형성하게 되며, 형성된 침전물은 치밀하지 않은 상태에서 유동성이 저하된다. 응집된 분말은 전단응력을 가할수록 점도가 최소값으로 떨어지게 되고, 응력을 제거하면 점도가 점점 증가하여 원래의 값으로 되돌아가는 틱소트로피(Thixotropy)특성을 갖게 된다.Fine particles adsorb ions on the surface of particles, and the surface characteristics of the adsorbed ions vary depending on the type of adsorbed ions (anion or cation). Particles are attracted to each other and stick together. In other words, if the addition of a deflocculant has a repulsive force between the particles, the particles are homogeneously dispersed in the liquid, and if a flocculant is added, the opposite phenomenon occurs and the fine particles aggregate to form a precipitate. The precipitate formed is less fluid in the less dense state. The agglomerated powder has a viscosity dropping to a minimum value as the shear stress is applied, and the thixotropy property is gradually increased to the original value when the stress is removed.
본 발명에 따른 응집제의 첨가량은 약 0.01내지 약 0.25중량%, 바람직하기로는 약 0.04 내지 0.08중량%범위로서, 분말의 입도에 따라 조정하며, 첨가량을 증가시키면, 작업성은 향상되지만, 상기 범위를 초과할 경우에는 분말이 과도하게 응집되어 건조시간이 길어지게 된다.The amount of the flocculant added according to the present invention is in the range of about 0.01 to about 0.25% by weight, preferably about 0.04 to 0.08% by weight, and is adjusted according to the particle size of the powder. In this case, the powder is excessively aggregated and the drying time becomes long.
대부분 치과용 도재분말은 평균입경이 약 20㎛, 최대입경이 90㎛정도의 입도를 가지므로 건조시간을 적당히 할 수 있고, 작업성이 우수한 치과용 도재분말을 제조하기 위해서는 상기 범위로 첨가량을 설정하는 것이 바람직하다.Most dental ceramic powders have an average particle diameter of about 20㎛ and a maximum particle size of about 90㎛, so that the drying time can be appropriately set, and in order to manufacture dental ceramic powder having excellent workability, the addition amount is set within the above range. It is desirable to.
[실시예(비교예)]EXAMPLE (Comparative Example)
덴틴 도재를 분쇄한 후 170 매시의 나일론체로 체가름하여 평균입경이 약20㎛, 최대입경이 90㎛가 되도록 분말입도를 조절하고, 덴틴도재분말에 응집제로서 황산 알루미늄, 황산 마그네슘, 수산화 칼슘을 각각 중량비로 0.02, 0.04, 0.06, 0.08% 첨가하고, 균질하게 혼합한 다음 증류수를 분말 : 증류수=4g : 2g의 비율로 혼합하여 크림상으로 만들어 각각 유동성을 측정 비교하였다.After crushing the dentin ceramics, the sieves were sieved with a nylon sieve of 170 meshes to adjust the particle size so that the average particle diameter was about 20 µm and the maximum particle diameter was 90 µm. 0.02, 0.04, 0.06, 0.08% by weight ratio was added, homogeneously mixed, and distilled water was mixed at a ratio of powder: distilled water = 4 g: 2 g to make a creamy form.
유동성의 측정방법은 내경 12㎜, 길이 16㎜인 튜브형 용기를 유리판 위에 세우고, 상기에서 제조한 혼합분말을 넣은 다음에 용기를 들어 올리면 혼합분말이 유리판 위에 남아 옆으로 퍼지게 된다.In the method of measuring fluidity, a tubular container having an inner diameter of 12 mm and a length of 16 mm is placed on a glass plate, the mixed powder prepared above is put in, and then the container is lifted, and the mixed powder remains on the glass plate and spreads laterally.
이 상태에서 1분 지난 후에 퍼진 직경을 측정한 결과를 각 시료의 유동성으로 판정하였으며, 그 결과는 다음 표 1과 같다After 1 minute in this state, the result of measuring the diameter spread was determined as the fluidity of each sample, and the results are shown in Table 1 below.
상기 실시예에와 비교하기 위하여 도재분말에 응집제를 첨가하지 않고 상기 실시예와 같이 유동성을 측정한 결과, 옆으로 퍼진 직경이 7cm 정도로 상기 표 1과 비교해 보면, 응집제를 첨가한 경우 유동성이 감소한 것을 알 수 있다. 이에 따라 본 발명에서와 같이 응집제를 적정량 첨가한 치과용 도재분말은 우수한 작업성을 가지게 된다.As compared with the above embodiment, the flowability was measured as in the above example without adding the coagulant to the porcelain powder, and compared with Table 1, the diameter of the side spreading was about 7 cm. Able to know. Accordingly, the dental ceramic powder to which the coagulant is added in an appropriate amount as in the present invention has excellent workability.
Claims (1)
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KR1019930026968A KR0120544B1 (en) | 1993-12-09 | 1993-12-09 | Dental plaster powder |
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KR1019930026968A KR0120544B1 (en) | 1993-12-09 | 1993-12-09 | Dental plaster powder |
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KR0120544B1 true KR0120544B1 (en) | 1997-10-22 |
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KR100596482B1 (en) * | 2004-08-12 | 2006-07-03 | 주식회사 한울로보틱스 | Climbing Structure for Mobile Robot with Suction Assembly |
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