Tooth-surface-membrane-forming powder containing sintered apatite
a technology of surface membrane and film layer, which is applied in the direction of impression caps, coatings, chemistry apparatuses and processes, etc., can solve the problems of not being able to directly coat teeth in the mouth, long time to form a film, and methods that have not been put into practical use, so as to reduce the solubility of the formed film layer, prevent tooth decay, and reduce the effect of tooth decay
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example 1
[Synthesis of Apatites]
1-1 Synthesis of Hydroxyapatite
[0067]A suspension of an apatite was produced by dropping an aqueous 0.3 M phosphoric acid solution (2 L) into an aqueous 0.5 M calcium hydroxide suspension (2 L) at room temperature. The pH of the reaction solution was adjusted to 10.5 by using aqueous ammonia solution. It is confirmed that the solution has been mixed thoroughly, and thereafter, this suspension was aged overnight. The obtained precipitate was filtered, and the solid matter was dried at 80° C.
1-2 Synthesis of Fluorine Apatite
[0068]An aqueous solution (2 L) was prepared by mixing 0.3 mol of phosphoric acid and 0.1 mol of hydrogen fluoride with 0.25 M calcium hydroxide suspension (2 L). The mixed aqueous solution of phosphoric acid and hydrogen fluoride was dropped into this calcium hydroxide suspension for 2 hours at room temperature. After the dropping was finished, the suspension was aged at 80° C. for 5 hours with the suspension stirred. The obtained precipitat...
example 2
[Preparation of Film-Forming Powders]
[0071]As an atmosphere furnace for calcining, a vacuum purge atmosphere furnace 2024-V (MARUSHO DENKI CO., LTD.) was used. As a device for grinding and classifying, the fluidized bed counter jet mill Counter Jet Mill 100 AFG (HOSOKAWA MICRON CORPORATION) was used.
2-1 Film-Forming Apatite Powders
[0072]Hydroxyapatite, fluorine apatite, carbonate apatite and magnesium-solid solution apatite synthesized as described above were ground with a mortar and calcined in the air, an argon gas atmosphere or a nitrogen gas atmosphere at 200 to 1350° C. or 600 to 1350° C. The calcined samples were ground and classified with a counter air flow mill to obtain hydroxyapatite powders of the respective samples, having a mean particle size of 0.5 to 30 μm.
2-2 Film-Forming Hydroxyapatite Powders in which Silica was Blended
[0073]As an ingredient other than apatites, 1% by weight of silica was added to the film-forming apatite powders synthesized in the above 2-1, and t...
example 3
[0075][Plasma Irradiation Treatment and / or Mechanical Energy Applying Treatment]
[0076]As a plasma irradiating device, the self-manufactured plasma generator was used. A 300 cc beaker was fixed on a slanted electric-powered turntable T-AU, rotated and used as a powder mixer used at the time of plasma irradiation.
[0077]The plasma generator is illustrated in FIGS. 1 and 2. In the Figures, the reference numeral 1 indicates AC / DC converter (AC 100 V→DC 24 V), the reference numeral 2 indicates a cold-cathode tube inverter (DC 24 V→AC 1000 V), the reference numeral 3 indicates a booster circuit (Cockcroft-Walton circuit, AC 1000 V→AC 10 kV), the reference numeral 4 indicates a plasma nozzle, and the reference numeral 5 indicates a gas flowmeter. Mechanofusion AMS-MINI (HOSOKAWA MICRON CORPORATION) was used as a device for applying mechanical energy, and a Nanocular NC-ALB (HOSOKAWA MICRON CORPORATION) was used as a device that enables application of mechanical energy and plasma irradiation...
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