Tooth-surface-membrane-forming powder containing sintered apatite

Abstract

In order to provide a film-forming powder using hydroxyapatite which is a main component of teeth, or hydroxyapatite in which a color tone adjuster is blended, the powder being used in a jet-device for forming a film on a surface of a tooth by spraying the powder on the tooth, and being suitable for forming a film having a high hardness and extremely low solubility in acid in a short period of time, and suitable for forming a film of a powder conforming to the color tone of a tooth in a short period of time; a hydroxyapatite powder calcined in an inert gas atmosphere at 600 to 1350° C., a powder obtained by applying to the hydroxyapatite powder calcined at 600 to 1350° C. plasma irradiation, or plasma irradiation and mechanical energy, and additionally a film-forming powders obtained by blending color tone adjusters into these hydroxyapatite powders are produced.

1 . A method for producing a film-forming powder for forming a film on a surface of a tooth for use in a jet-device for a tooth, the powder having a mean particle size of 0.5 to 30 μm, comprising calcining an apatite represented by Ca 10-X .M X (ZO 4 ) 6 Y 2  (wherein X represents 0 to 10; M represents a metal or hydrogen; ZO 4  represents PO 4 , CO 3 , CrO 4 , AsO 4 , VO 4 , SiO 4 , SO 4  or GeO 4 ; and Y represents a hydroxyl group, a halogen element or a carbonate group) is fired at 600 to 1350° C., and then performing grinding and classification, and thereafter performing plasma irradiation. 
     
     
         2 . The method for producing a film-forming powder according to  claim 1 , wherein the apatite is hydroxyapatite. 
     
     
         3 . The method for producing a film-forming powder according to  claim 1 , wherein the film-forming powder is calcined in an inert gas atmosphere at 600 to 1350° C. 
     
     
         4 . The method for producing a film-forming powder according to  claim 3 , wherein the inert gas is argon gas or nitrogen gas. 
     
     
         5 . The method for producing a film-forming powder according to  claim 1 , comprising further blending a color tone adjuster for adjusting a color tone of a tooth crown. 
     
     
         6 . The method for producing a film-forming powder according to  claim 5 , wherein the color tone adjuster of a tooth crown is at least one selected from titanium oxide, zinc oxide, and ultramarine blue and a red pigment. 
     
     
         7 . The method for producing a film-forming powder, according to  claim 1 , comprising further applying mechanical energy. 
     
     
         8 . The method for producing a film-forming powder according to  claim 7 , wherein plasma irradiation is performed after applying mechanical energy. 
     
     
         9 . The method for producing a film-forming powder according to  claim 1 , wherein the plasma irradiation is plasma irradiation in which helium gas is used as an irradiation gas. 
     
     
         10 . The method for producing a film-forming powder according to  claim 1 , wherein a film thickness of a formed film is 30 μm or more, and Vickers hardness is 340 Hv or more when the powder is sprayed on a substrate under conditions of an inner diameter of a handpiece tip nozzle of 0.5 to 5.0 mm, a spray pressure of 0.2 to 0.8 MPa, a distance between a spray nozzle tip and a substrate of 0.1 to 3.0 cm, and a moving speed of the spray nozzle of 0 to 10 mm/s. 
     
     
         11 . The method for producing a film-forming powder according to  claim 2 , wherein the film-forming powder is calcined in an inert gas atmosphere at 600 to 1350° C. 
     
     
         12 . The method for producing a film-forming powder according to  claim 2 , comprising further blending a color tone adjuster for adjusting a color tone of a tooth crown. 
     
     
         13 . The method for producing a film-forming powder, according to  claim 2 , comprising further applying mechanical energy. 
     
     
         14 . The method for producing a film-forming powder according to  claim 2 , wherein the plasma irradiation is plasma irradiation in which helium gas is used as an irradiation gas. 
     
     
         15 . The method for producing a film-forming powder according to  claim 2 , wherein a film thickness of a formed film is 30 μm or more, and Vickers hardness is 340 Hv or more when the powder is sprayed on a substrate under conditions of an inner diameter of a handpiece tip nozzle of 0.5 to 5.0 mm, a spray pressure of 0.2 to 0.8 MPa, a distance between a spray nozzle tip and a substrate of 0.1 to 3.0 cm, and a moving speed of the spray nozzle of 0 to 10 mm/s. 
     
     
         16 . The method for producing a film-forming powder according to  claim 3 , comprising further blending a color tone adjuster for adjusting a color tone of a tooth crown. 
     
     
         17 . The method for producing a film-forming powder, according to  claim 3 , comprising further applying mechanical energy. 
     
     
         18 . The method for producing a film-forming powder according to  claim 3 , wherein the plasma irradiation is plasma irradiation in which helium gas is used as an irradiation gas. 
     
     
         19 . The method for producing a film-forming powder according to  claim 3 , wherein a film thickness of a formed film is 30 μm or more, and Vickers hardness is 340 Hv or more when the powder is sprayed on a substrate under conditions of an inner diameter of a handpiece tip nozzle of 0.5 to 5.0 mm, a spray pressure of 0.2 to 0.8 MPa, a distance between a spray nozzle tip and a substrate of 0.1 to 3.0 cm, and a moving speed of the spray nozzle of 0 to 10 mm/s. 
     
     
         20 . The method for producing a film-forming powder according to  claim 4 , comprising further blending a color tone adjuster for adjusting a color tone of a tooth crown.