Method for forming complete mandible prosthesis with variable-density porous structure

Abstract

The invention discloses a method for forming a complete mandible prosthesis with a variable-density porous structure. For an injured mandible, head CT and MRI data are obtained respectively, and a three-dimensional model of a mandible bone structure and three-dimensional models of articular cartilage, ligament and muscle tissue of the mandible are respectively established; through three-dimensional image fusion and mirror repair, a complete three-dimensional reconstruction model of the mandible is obtained; the stress distribution of the mandible is obtained; according to the stress distribution of the mandible, the three-dimensional model of the mandible bone structure is taken as an object of optimization design, a circular hole is taken as a filling unit, a topology optimization designis carried out, and finally a complete mandible prosthesis model with a variable-density porous structure is obtained; and titanium alloy powder is processed, cleaning, annealing heat treatment, wirecutting and de-supporting, sandblasting and polishing treatment are carried out, and the final complete mandible prosthesis with the variable-density porous structure is obtained. The variable-densityporous structure obtained by the method is closer to the mechanical properties of natural bones, and the biocompatibility is better.

Description

technical field [0001] The invention relates to a method for forming a full mandibular prosthesis with variable-density porous structure, and belongs to the technical field of artificial metal bone formation. Background technique [0002] The mandible is located in the middle and lower third of the face. Together with the maxilla, it forms and maintains normal chewing and language functions. It is the only movable bone in the face, and its anatomical shape and position are special. Segmental defects of the mandible caused by congenital deformities, tumor resection, trauma, etc., result in the destruction of the integrity and continuity of the mandible, which not only causes functional obstacles such as chewing and swallowing, but also easily leads to facial deformities. , It is necessary to restore the function and appearance through repair and reconstruction. At present, for large-scale segmental defects of the mandible, especially for defects of any length on one side of ...

AI Technical Summary

Problems solved by technology

The three-dimensional model of the printed titanium alloy mandibular prosthesis is mainly derived from CT scan data. These data cannot clearly show the structure and positional relationship of the mandibular condyle, articular disc and glenoid socket. The formed prosthesis fits the patient's mandibular joint Not ideal; the biomechanical model information comes from the standard model or other normal mandibular structures, which cannot fully reflect the stress on the patient's own mandible; in order to reduce the weight of the prosthesis, a lattice hollow + skin structure is adopted, and a uniform lattice structure cannot Precisely control the stress conduction of the bone, and the sealed skin cannot allow the implantation and growth of muscles and nerves

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