A method of manufacturing orthopedic products from titanium alloy

 

(57) Abstract:

The method is intended for use in prosthodontics and maxillofacial prosthetics and other medical and obsesiones spheres of human activity. In preparation for the forming and the forming of the prosthesis or element of the prosthesis, such as a basis for a removable dental prosthesis, first perform hot rolling the billet of titanium alloy to a thickness of 3-15 mm and spend a tempering temperature of 950-1150oC. At 700-800oC the workpiece to deform the sheet thickness of 0.5 to 2.5 mm, which is then placed on a refractory ceramic matrix. Then on one side of the sheet creates a pressure from 0.1 to 2.0 MPa, and on the other side - discharge from 0.7 to 7.0 PA. The temperature is set from 750 to 1000oC. the Technical result of the invention is economically rational obtaining high-precision thin-walled bases of titanium alloys for comfortable dentures and other prostheses, the surface of which is an exact copy of the prosthetic field of the patient.

The invention relates to medicine, namely to prosthodontics, maxillofacial prosthetics, and other medical and obligations removable dentures (bases), according to which the Foundation of the get method for the casting of titanium alloy (Rogozhnikov, I., Sochnev C. L., Olenev L. M. and other Titanium bases dentures, Perm, LLP "Printing "Book" 1994, page 270).

However, this method is very labor intensive to manufacture, expensive special equipment and does not allow to obtain high-precision thin-walled bases of titanium alloys. The lack of fidelity of the microrelief palatal surfaces of the base when casting leads to the need for additional mechanical processing (milling, grinding). Furthermore, the method does not allow to receive oral surface of a base made of titanium alloy, the corresponding individual relief palate of the patient. All these shortcomings lead to a reduction in the functional qualities of removable dentures in General.

The closest technical solution is a method of manufacturing bases removable dental prostheses according to which the base is obtained by pressing of titanium or titanium alloy (Application N 62-32942, Japan, MKI 4 A 61 C 13/1, publ. 17.07.87).

Meanwhile, it is known that titanium and its alloys are to difficult-to-deform materials. This premutico in terms of individual production, what is the production bases of the dental implants and other orthopedic products. This method is also practically impossible to reproduce the relief of the mucous membranes of the oral cavity of the patient and other geometrically-complex thin-walled products with the required accuracy, which ultimately depend on the functional properties of the prostheses and the quality of treatment.

The proposed method of manufacture of orthopedic products from titanium alloy, such as a basis for a removable dental prosthesis that is free from the above drawbacks, which is achieved by the use of blanks from a sheet of titanium alloy with a thickness of 0.5 to 2.5 mm, obtained according to the special regulations, as well as optimization techniques molding.

This method also provides a high capacity for deformation of the titanium billet. Expensive metal matrix is replaced by a much cheaper industrial refractory ceramics. As a forming element instead of a complicated and expensive punches used a slight excess pressure of inert gas.

Technical result achieved economically rational obtaining high-precision thin-walled bases of titanium alloys for comforta field of the patient.

It is achieved by the fact that in the process of preparing materials for forming deform it to hot rolling to a thickness of 3-15 mm and spend a tempering temperature of 950-1150oC, and then, using the operations of rolling, annealing and pickling, get a sheet thickness of 0.5 to 2.5 mm, which is placed on a refractory ceramic matrix, which is placed on the pallet or in a housing of heat-resistant material and molded at a temperature of 750 to 1000oC, with one side creates a pressure from 0.1 to 2.0 MPa, on the other hand - discharge from 0.7 to 7.0 PA.

The method is as follows.

At the first stage on the best modes of preparing a sheet of titanium alloy with a thickness of 0.5 to 2.5 mm with specified properties, guaranteeing reception of the (playback) exact imprint surface with all features and details of micro - and macro-relief on the subsequent stages of the process model, made of refractory ceramics. To do this, the original hot rolled billet thickness of 3-15 mm titanium alloy is heated in a furnace to a temperature of 950-1150oC and cooled in cold water.

Then, the workpiece is deformed at a temperature of 700-800oC to the desired thickness, stop oxidation) and then cut-to-length harvesting.

In a second step, plaster prints make models of refractory ceramics by casting. Then these models are placed on a pallet or in a metal holder made of heat-resistant alloy, which has a special cut, the size and shape which allow you to place in it the imprint of the oral surface of any patient or another model. The number of simultaneously forming parts may vary from 1 to N and depends on the size of the stamp and economic feasibility. Then on the ceramic models top lay a sheet of titanium alloy with a thickness of 0.5 to 2.5 mm, heat the pan or holder with a sheet to a temperature of 750 to 1000oC, then under the sheet creates a negative pressure (vacuum) of 0.7 - 7.0 PA, and the top to create the pressure of the inert gas, such as argon, from 0.1 to 2.0 MPa, after 15-40 minutes exposure model is cooled to room temperature. Bases or other products desired profile cut along the contour, for example, by a laser beam, obtochuyut the edge of the abrasive wheel, remove the dross in sand-blast apparatus, and, if necessary electropolished surface.

The production basis for a removable dental prosthesis tested in the clinic of orthopedic dentistry, Moscow medical Stomatologiya titanium bases for removable dentures.

Practically the method of manufacturing a base for a removable dental prosthesis and other products can be implemented, for example, as follows.

Sheet billet of titanium alloy is clamped between the flanges of the two halves of the form, in the lower proforma are models on the pallet or in the cage, shape and topography which you want to play from a titanium alloy. The alignment of the half-form, their mixing and dilution, the creation of the efforts of the clamp on the edge of the sheet between the half-form is forging system. After the clamp plate of the mold halves form a sealed chamber, separated by a sheet into two parts, each of which has a channel of communication with the gas system and can be independently of the other or vakuumirovannoj or filled with inert gas under a certain pressure.

The sealed mold halves are placed in the oven where it is heated to a predetermined temperature. Upon reaching the desired temperature between the top and bottom of the camera creates a differential pressure of inert gas, such as argon, so that the sheet sags into the vacuum side of the mold halves and "blown" located in her ceramic matrix (model), obliga her relief. In this period of time and the program is removed from the oven snap to accelerate its cooling, tightness same half-form is supported by the pressure to temperature, precluding oxidation of recoverable items. Then equalize the pressure in both semi-molds to normal and remove the workpiece from the mold, cut out, bases or other items and expose them to the final mechanical and electrochemical processing.

A method of manufacturing orthopedic products from titanium alloy, such as a basis for a removable dental prosthesis, which consists in the fact that the billet of titanium alloy is prepared by molding, and is then formed, characterized in that in the process of preparing materials for forming deform it to hot rolling to a thickness of 3-15 mm and spend a tempering temperature of 950-1150oC, and then, using the operations of rolling, annealing and pickling, get a sheet thickness of 0.5 to 2.5 mm, which is placed on a refractory ceramic matrix feature matrix on a pallet or in a housing of heat-resistant material and molded at 750-1000oC, with one side creates a pressure from 0.1 to 2.0 MPa, on the other hand - discharge from 0.7 to 7.0 PA.

 

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