Method for manufacturing metal carcasses coated with gold to be revetted with ceramics or composite material
FIELD: medical engineering.
SUBSTANCE: method involves carrying out electrochemical degreasing metal prosthesis carcass surface, anodic etching and cathodic etching and then coating with 0.1-0.3 mcm thick primary gold layer from acid electrolyte. Next to it, 40-50 mcm thick basic gold layer is deposited from alkaline electrolyte.
EFFECT: improved esthetic properties; lowered toxic properties of alloy.
The invention relates to medicine, namely dentistry, and can be used in the manufacture of dental prostheses for applying gold coatings on metal frames.
A known method of manufacturing a metal frame dentures, on which the ceramic mass with several layers (minimum - 3) is applied on the layer of oxide film (Vigabatrin, Lamar. Prosthodontic appliances. M.: Medicine, 1985 s.204).
The disadvantages are the counterpart insufficient aesthetic properties of the prosthesis, because the ceramic material is applied to the layer of oxide film, and in places smooth transition from ceramic to metal oxide film is looking through a thin layer of ceramic. In addition, in some cases, it becomes possible course of the process of corrosion in the oral cavity with the formation of Nickel hydroxide and chromic acids. Because of the potential allergiesthe Nickel included in the composition of the alloy, a number of patients recorded cases of inflammation and swelling of the gums in places of contact of the metal with the periodontal tissues.
Known method of applying a thin layer of gold coating on which gold in the form of a paste consisting of pure gold or alloy with a very high proportion of pure gold in the form of powder and liquid products containing organic constituents (SAP, resin, lacquer solutions), heat(EP No. 0360848, IPC And 61 With 13/00, 12.07.2000). When heated organic integral part of the burnt and powder particles are joined by sintering. The gold is applied before the burning of the ceramic material with a brush on a metal frame. Then gold is sintered to the core material in a ceramic kiln at a temperature of 800-1050°C. When heated organic integral part of the burnt and powder particles are joined by sintering. For a homogeneous layer covering gold after sintering is crucial shape, size and distribution of the particles of metal powder. Significantly influenced by the fluidity of covering-gold paste on the frame of the prosthesis. Defects shall be eliminated as follows: tokatlian or perforated details metal frame before applying the gold enclose the platinum foil. In conclusion, implementing the additional application of a gold coating (extension "potlacene") unconfined parts of the metal frame after annealing of the ceramic material. Thanks to the application of gold on the palladium foil, which was adapted to the tooth stump, made the frames for ceramic single crowns.
The disadvantages are the counterpart of the occurrence of air bubbles, the impossibility of applying a layer of uniform thickness over the entire surface, so what. the gold is applied with a brush, inability to obtain strong coupling covering the metal based on the level of the crystal lattice.
The task of the claimed invention is to improve the aesthetic properties of the prosthesis and reduce toxicity of alloy.
This object is achieved in that in the method of manufacturing a metal frame dentures, coated with gold under the veneer porcelain and composite, in which a metal frame is applied a layer of gold, unlike the prototype produce electrochemical degreasing the surface, then carry out the anodic and cathodic etching etching, after which put the primary layer of gold, a thickness of 0.1-0.3 microns from the acidic electrolyte, then put a base layer of gold 40-50 μm of the alkaline electrolyte.
A specific example of implementation of the method
As the material for the cover was selected gold (AU) high purity not less than 99% because of the affordability and good damping properties due to the ability of the alignment of the mechanical stresses between the frame and the facing material. In addition, gold has a high aesthetic properties and is inert with respect to oxygen and nitrogen at high temperatures, has corrosion resistance, high biocompatibility and the possibility of obtaining a solid with the unity with the facing layer. Also the coating at the respective methods of surface preparation can be applied to cobalt-chromium alloys and stainless steel.
It is essential to apply the coating to a carefully prepared surface, to avoid delamination of the coating, as well as education in the future of gas bubbles and stains.
First, processing is carried out in a sand blasting apparatus with the smallest grain size (aluminium oxide), then the processing produces a jet of steam under pressure or in an ultrasonic bath, to clean the rest of abrasive material.
Next produce electrochemical degreasing. The anode is a stainless steel HT in solution composition, g/l: sodium hydroxide NaOH - 20, soda Na2CO3- 40 threatreport PA3RHO4- 35. The cathode is the workpiece. The process was carried out at a voltage of U=5 V, temperature t°=20°during the time T=3-5 minutes
Then produce anodic etching under the following conditions: cathode material - stainless steel HT, the anode is the workpiece in a solution containing, g/l: ethylene glycol - 730, phosphoric acid, H3RHO4- 100, sulfuric acid, H2SO4- 60, ethyl alcohol 96% - the rest (up to 1 l) at voltage U=12 V, temperature t=20-30°C for time T=1 min
Next, perform the cathode baiting is their a 25%solution of hydrochloric acid Hcl, the anode is platinized titanium or graphite in the following mode: voltage U=5 V, temperature t°=20-30°S, time T=2 minutes
The subsequent operation is the application of the primary layer of gold with a thickness of 0.1-0.3 μm from the acidic electrolyte in solution, g/l: dicyanoaurate potassium KAu(CN)2- 2, citric acid6H8O7- 50. The graphite anode, the voltage U=4, the item constantly shake. Applying a primary layer of gold continues until the visible bright yellow color over the entire surface, then put the main layer of gold 40-50 μm of the alkaline electrolyte.
Thus, the claimed invention can significantly improve the aesthetic properties of the prosthesis, thanks to the warm Golden hue of the teeth and to reduce the toxicity of the alloy, using cobalt-chromium alloys and stainless steel.
A method of manufacturing a metal frame dentures, covered with gold, under the veneer porcelain and composite, in which a metal frame is applied a layer of gold, characterized in that the produce electrochemical degreasing the surface, then carry out the anodic and cathodic etching etching, after which put the primary layer of gold with a thickness of 0.1-0.3 μm from the acidic electrolyte, then put a base layer of gold 40-50 μm of the alkaline electrolyte.
SUBSTANCE: tooth root canal filling composition effective in cases of periodontitis and parodontosis contains zinc oxide, resorcinol, formalin, and additionally thymol, all taken is specified proportions. Composition allows treatment of periodontitis and parodontosis with elevated tooth mobility and without change in solid dental tissue color.
EFFECT: increased treatment efficiency and simultaneously antiseptic and bactericidal properties.
FIELD: medical engineering.
SUBSTANCE: device has partial removable palatine plate prosthesis bearing artificial temporary. The palatine plate has an anterior and two lateral segments connected to each other by means of screw in the anterior palatine fornix region allowing autonomous displacement. Cramp iron members are set on the fangs and on the boundary separating the anterior and lateral segments and on the second temporary molars. Shield for moving upper lip aside is placed in the area of dental arch defect along alveolar process with anterior segment. The shield forms slit between shield surface and gingiva. The shield is stretched to contact point of fang to the first permanent molar. Shield edge is made oval and congruent to transit fold contour.
EFFECT: cosmetically full-valued substitution of upper dental arch defect.
SUBSTANCE: method involves basic and auxiliary horizontally arranged surfaces joined by means of additional frontal, back and two lateral vertically arranged surfaces with a plane being formed. The frontal and back vertically arranged surfaces have recesses as retention grooves. Reference notches are made in the nose area on auxiliary surface. The alveolar process is manufactured base and wall. The base has reference notches. The wall has openings for reducing process weight. Teeth are mounted on the wall. Three openings arranged as triangle which base is turned towards pharynx are produced in auxiliary surface of the obturator prosthesis. Metal containers having matrices pressed into them are introduced into the openings. Three openings arranged as triangle which base is turned towards pharynx are produced on the base bottom. Pedicles (flow gates) having retention notches are mounted in the openings. Each flow gate ends in patrix engageable with corresponding matrix.
EFFECT: simplified and reliable method for fixing alveolar process.
3 cl, 3 dwg
SUBSTANCE: method involves applying preparative endodontic treatment, fixing reinforcing net in prepared cup-like tooth cavity formed and produced in root base zone. The cup-like tooth cavity is formed after having temporarily fixed crown part walls along the fracture line using enveloping composite ring, gingiva retraction and preparing demineralized tissues. The crown part walls are formed from composite material keeping to anatomical shape of tooth under restoration after having fixed root fracture with glass ionomer cement being used. The net is shaped in advance to make it congruent to cavity of tooth under restoration and fixed in the cavity by means of fluid composite. The formed cavity is filled with microfilled composite. Macrofilled composite is used for building tooth crown part and tubercles.
EFFECT: high strength of the structure; long service life.
SUBSTANCE: method involves carrying out odontopreparation, forming cylindrical tooth stump to gingival level, forming a projecting part on this place and fixing net carcass on the stump followed by crown part restoration using composite material. When forming stump, occlusion surface is filed off by 0.9-1.2 mm and additional retention zones like 0.2-0.3 mm deep horizontal grooves are formed on the aproximal surfaces. The carcass is produced from gold-plated metal wire net having 0.4 mm large meshes to fit the stump. Before being fixed, the net carcass is treated twice with masking agent leaving meshes open. Final crown part restoration follows with anatomical tooth shape being taken into account.
EFFECT: fully restored anatomical tooth shape; high strength of tooth walls; long service life; high esthetic quality.
SUBSTANCE: method involves using metal or gold-plated square net having side not longer than root canal. The net is shaped as a surface coupled with root base cavity surface and fixed with cement. Wires located in the net square perimeter zone are used for reinforcing the crown part. Wires are not as long as twice the crown part height. The wires are fixed on the internal surface of artificial enamel layer produced in advance in conformance with anatomical tooth shape. Their free ends are bent placed in root part cavity in artificial dentine layer. The artificial enamel layer and chewing tooth surface are produced from macrofilled composite and artificial dentine from microfilled composite.
EFFECT: high strength of restored tooth; enhanced effectiveness of restoration in the cases when pin structures are not indicated; long service life under chewing loading.
SUBSTANCE: method involves reinforcing crown part defect with wave-shaped wires. The wires are taken in advance from gold-coated metal network, Ѕ tooth root length long wire portion is twisted and fixed in the canal. Free ends of the wires are distributed along vestibular surface of tooth cutting edge and bent towards vestibular tooth surface 1-1.5 mm below the cutting edge. Free ends of the wires are fixed in oval tooth cavity on the vestibular tooth surface side. Artificial enamel layer is produced from macrofilled composite material anatomically matching in shape the incisor crown part, fixing the wave-shaped wires in composite material. Artificial dentine is produced from microfilled composite material.
EFFECT: high strength of incisor walls; long service life under chewing loading.
FIELD: medical engineering.
SUBSTANCE: device has perforated plate or metal wire network plate. Pin has reinforcing part manufactured as curve plate and fixing part matching root base cavity in shape and fastening member. The reinforcement pin is fixed in root canal with a fastening member manufactured from twisted metal threads passed through fixing part of the pin. The crown tooth part is formed on the reinforcing pin part from composite material.
EFFECT: retained anatomical natural tooth shape and appearance; retained crown part.
FIELD: medical engineering.
SUBSTANCE: method involves preparing dental supraradical part and canal, taking double imprint, molding gypsum model, modeling the pin and insert with wax on the model, substituting the wax pin insert with metal one, fitting and fixing the insert on the tooth. Tooth root bottom is prepared as hemisphere and the pin tip is modeled from wax of the same shape. Stump part of the insert is modeled to give it lateral surface convergence angle from 5 to 10° towards the median tooth axis.
EFFECT: facilitated modeling process.
2 cl, 4 dwg
FIELD: medical engineering.
SUBSTANCE: device has base bearing artificial teeth, clasp and cramp iron members joined to bases provided with flexible envelope. The flexible envelope, rotatable when taking off or setting prosthesis, is fastened to cramp iron member and fixed in longitudinal direction by means of thickenings on cramp iron hook tips which sizes are not greater than external diameters of flexible envelope or internal flexible envelope surface prominence and counterpart grooves on the cramp iron members.
EFFECT: excluded anchorage teeth loosening.