Symmetrical character maxillofacial prosthesis producing method based on three-dimensional visual sensation measurement

Abstract

A symmetrical characteristic face prosthesis preparation method based on three-dimensional vision measurement belongs to the technical field of mechanical engineering and medical engineering. The present invention constructs a face triangular surface patch according to the point cloud data of a measured position of the patient face. An initial mirror image surface of the face triangular surface patch is obtained by a mirror image of an initial mirror surface to be optimized and jogged to obtain an optimized mirror surface; then a corresponding perfect part images at a defect part along the optimized mirror surface to be faired with the surrounding triangular surface patch to pick up a required prosthesis surface and a locating explorator surface is manufactured at the same time; the prosthesis surface and the locating explorator surface are respectively stretched into the data of a prosthesis surface patch and a locating explorator surface patch with certain thicknesses, and a selective laser sintering fast forming machine is used for manufacturing the prosthesis surface patch and the locating explorator surface patch; the prosthesis surface patch is used for fitting the face of the patient to manufacture a prosthesis fast mould; a medical silica gel prosthesis is manufactured inside a vacuum mould-duplicating machine. The method of the present invention can be used for obtaining exact defect area information and improves the manufacturing efficiency and the manufacturing precision of the prosthesis obviously.

Description

technical field [0001] The present invention relates to a method for preparing a facial prosthesis, in particular to a method for preparing a symmetrical facial prosthesis based on three-dimensional visual measurement, which uses the integrated technology of non-contact three-dimensional vision measurement, reverse engineering and rapid prototyping for facial restoration , belonging to the field of mechanical engineering and medical engineering technology. Background technique [0002] Due to the special anatomical shape, tissue structure and other influencing factors of maxillofacial organs, large-area facial defects can sometimes not achieve satisfactory repair results through surgical methods. Proportion. However, in recent decades, the production technology of facial prostheses has been stuck in the traditional stage of impression making and manual engraving by technicians, that is, using various impression materials to obtain the defect status of the patient's defect a...

AI Technical Summary

Problems solved by technology

This traditional method has some disadvantages: the impression material will irritate the tissue to a certain extent, and may cause soft tissue displacement, resulting in model deviation; the traditional mechanic operation method has complex production process, long production cycle, poor aesthetic effect, etc. A series of problems, the production of prosthesis depends largely on the technician's personal art ability; in addition, the traditional method has problems in the positioning of the prosthesis, fitting with the tissue surface, edge processing, and morphology lacking

In terms of obtaining defect facial data, the methods currently used are: 1. CT and MRI, which have the disadvantages of low spatial resolution and poor measurement accuracy, especially for soft tissue reconstruction; Radiation has certain damage to the human body, and the measurement method takes a long time to obtain data, and the cost of clinical use is high; 2. Laser scanning technology, its shortcomings are: the measurement speed is slow, and it cannot meet the requirements of human body posture and expression changes during the measurement process. The requirement of quickness and the potential damage of laser light source to human eyes limit the application of this method in anthropometry and facial remodeling

Therefore, there is still a gap in the entire facial defect repair system, and there is still a considerable distance from clinical application.

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