METHOD FOR DENTAL BRIDGES MANUFACTURE Russian patent published in 2018 - IPC A61C13/09 

FIELD: medicine.

SUBSTANCE: method for dental bridges manufacture, comprising manufacture of individual bridge parts from ceramic material, in particular ZrO₂, or ZrO₂ with addition of up to 10 mol % of Y₂O₃, and interconnection of the individual parts of the bridge by molten glass applied on them. A patient's tooth impression is made, which is used to make a plaster model from which the shape of the prepared teeth is read by a scanner, this copy of the patient's teeth model is saved in a separate computer program that simulates the desired shape of the frame of future dental crowns from zirconium, crown-frame bases are made in accordance with the computer program, using a milling machine, after which the crown frame is fixed to the axis of the rotary device placed in the vacuum chamber of electronically pulsed accelerator, vacuum of 10^-2-10^-3 Pa is created in the accelerator vacuum chamber and the crown is irradiated with pulsed electron beams accelerated up to 15 keV - 20 keV, the duration of which lies in the range from 100 μs to 200 μs, at beam current (100-200) A, pulse repetition rate (0.2-0.4) s^-1, and the diameter D of the electron beam in the region of the irradiated elements satisfying the inequality D≥L, where L is the maximum linear dimension of the irradiated bridge elements. To uniformly irradiate the entire treated surface of dental bridge parts, they are rotated relative to the electron beam, for which the ball bearing is pressed onto the rotary device axis, the outer part of which is mechanically fixed to the vacuum chamber wall. At that, an irradiated part of the dental bridge is fixed at one end of the axis facing the inside of the vacuum chamber and a permanent magnet, which is fed to the sealed partition of the vacuum chamber made of non-magnetic material, is fixed at the other end of the axis. At that, from the outside of the vacuum chamber, a similar permanent magnet is fed to the said partition, which is fixed to the end of the stepper motor shaft. They are installed magnets so that the polarities of the magnets fixed on the rotating axis and end face of the stepper motor shaft have mutually opposite poles. After each next irradiating electron pulse, current pulses are applied to the stator winding of the stepper motor in pauses between these irradiating pulses, thereby rotating the rotary device axis to an angle corresponding to the rotation angle of the stepping motor axis after feeding one or more current pulses to the stator winding, providing its turn-by-turn rotation. The process of bridge elements irradiation is completed after the rotary device axis with the dental bridge elements fixed on it makes 8-10 complete revolutions, after which the manufactured elements of the dental bridge are installed to the patient and fastened by means of molten glass deposited on them.

EFFECT: invention allows to provide a degree of aesthetics of a permanent dental prosthesis with its greatest approximation to the natural form.

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