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

Abstract

An asymmetrical 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 alternative facial form is selected from a standard facial form library according to personal requirement, the triangular surface patches of the face and the alternative face form are jointed for comparing the comprehensive gap between the face and a plurality of alternative face forms, the alternative face form with minimum gap value is selected as an optimized alternative face form; a corresponding standard characteristic body is faired with the surrounding triangular surface patch to pick up a required prosthesis surface; the prosthesis surface is stretched into the data of a prosthesis surface patch with certain thickness, and a selective laser sintering fast forming machine is used for manufacturing the prosthesis surface patch; the prosthesis surface patch is used for fitting the patient face 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 the optimized standard characteristic body, realizes the exact positioning of the prosthesis 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 non-contact three-dimensional visual measurement, reverse engineering and rapid prototyping integrated technology for facial restoration based on three-dimensional visual measurement for the preparation of an asymmetric feature facial prosthesis The method belongs to the technical fields of mechanical engineering and medical engineering. 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 are...

AI Technical Summary

Problems solved by technology

This traditional method has some disadvantages: the impression material will be irritating to the body tissue, and may cause soft tissue displacement, resulting in model deviation; the traditional mechanic operation method has complex production process, long production cycle, and poor aesthetic effect For a series of problems, the production of prosthesis largely depends on the technician's personal art ability; in addition, the traditional methods are difficult in the positioning of prosthesis, fitting with tissue surface, edge processing, and morphology. there is a lack

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 affects the human body with the development of computer technology. New technologies such as computer-aided design and manufacturing (CAD / CAM), reverse engineering (RE), and rapid prototyping (RP) are applied to the field of prosthetics for facial defects.

This method replaces the original model taking method to obtain accurate defect area information to determine the damage, and the measurement method takes a long time to obtain data, and the cost of clinical use is high; 2. The disadvantage of laser scanning technology is that the measurement speed is slow , can not meet the requirements of rapid measurement for changes in human body posture and expression during the measurement process, and the potential damage of the laser light source to the human eye limits the application of this method in anthropometric measurement and facial remodeling

These studies are all in the exploratory stage. For example, in the production of nasal prostheses, the standard face shape is selected according to the comparison between the measurement parameters of the patient's face and the standard face shape. accumulated into the modeling process

Therefore, the entire facial defect repair system still has certain defects, and there is still a considerable distance from clinical application.

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