METHOD FOR MANUFACTURING A REMOVABLE PLATE DENTURE WITH A POLYMER MESH FOR REINFORCING THE BASIS OF REMOVABLE DENTURES IN THE UPPER JAW Russian patent published in 2023 - IPC A61C13/01 

FIELD: medical equipment.

SUBSTANCE: invention used to improve the strength (reinforcement) of the bases of removable laminar dentures replacing partial and complete absence of teeth. During implementation of the method on a virtual model of the jaw in a denture modelling software, the first layer of the basis for the future prosthesis is modelled with a thickness of 0.5 mm. The boundaries of the first layer correspond to the boundaries of the tissues of the prosthetic bed. On top of the first layer of the virtual basis a reinforcing mesh is modelled congruent to the prosthetic bed. The boundaries of the mesh are 5 mm away from the boundaries of the basis of a complete removable laminar denture along the entire perimeter. Mesh stoppers are modelled on the mesh surface facing the prosthetic bed in the form of truncated inverse cones 0.5 mm high with a base section of 2 mm and a truncated top of 1 mm. Stoppers are placed along the perimeter of the mesh, 2 mm away from the outer borders of the mesh, at a distance of 10 mm from each other and 5 mm away on the left and right along the median line of the hard palate. Perforations 2 mm in diameter are formed over the entire surface of the virtual mesh model. In the intervals between the stoppers and along the top of the alveolar process of the upper jaw, on top of the virtual mesh model, the second part of the base of the removable denture is modelled. The boundaries of the denture along the perimeter are connected to the boundaries of the first layer of the future basis and correspond to the boundaries of the tissues of the prosthetic bed. Obtained virtual model of the basis, consisting of two layers and a virtual reinforcing mesh located between them, is furnished with artificial denture teeth set according to the individual characteristics of anatomical and topographic features of the prosthetic bed and field, as well as facial aesthetics. The resulting virtual model of a complete removable laminar denture is analysed in CAE-module software for mathematical analysis for possible breakages under cyclic and static loads, that, if determined, cause changes in perforation topography on the virtual model of the reinforcing mesh until the stress diagrams in the basis of the denture disappear. After verifying the effectiveness of the reinforcing mesh, its virtual model is converted into a physical model by means of 3D printing from a dental polymer with physical and mechanical parameters characterizing strength, fracture strain, and elastic modulus. Further, the polymer mesh is used for personalized reinforcement of the basis of complete removable lamellar dentures, manufactured using analog technology.

EFFECT: manufacturing of a removable laminar denture with a reinforcing mesh, fabricated as per economically available 3D printing technology from a personally selected structural polymer material according to physical and mechanical characteristics adequate to multidirectional static and cyclic functional loads developed by the dentoalveolar apparatus of a particular patient.

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