A longitudinally fixed substitute prosthesis for maxillofacial

Abstract

The invention discloses a structure design of a vertically fixed substitute prosthesis for an occlusalf surface. Screw pores for vertically fixing the substitute prosthesis are formed on the section of the prosthesis, and matched with drill bushings and screws, the drill bushings and the screw pores are in clearance fit, and the drill bushings and the screws are in clearance fit. The traditional extender fixing technology is changed by the vertically fixed prosthesis, so that the periosteum and soft tissues are prevented from being peeled in a large area in the fixing process, and the possibility of prosthesis cracking is reduced. More importantly, the vertical fixing method does not change the main stress mode of lower jawbone of a patient, and the stress shielding effect of the extender on the lower jawbone covered by the extender in the transverse fixation can be avoided, and post-operation bone atrophy can be effectively prevented.

Description

technical field [0001] The invention belongs to the technical field of substitute prosthesis, and relates to a structural design of a longitudinally fixed substitute prosthesis of the maxillofacial region. Background technique [0002] The shape of the human mandible varies greatly among individuals. For large bone loss caused by trauma, tumors, and congenital bone defects, the fundamental method is to implant artificial substitutes through surgery. Because the shape of the traditional artificial implant is very different from that of the original bone, which seriously affects the aesthetics of the patient's face and brings great physical and mental pain to the patient, the design and manufacture of substitute prostheses are increasingly attracting people's attention. An important problem faced by surrogate prostheses in practical application is the issue of fixation. [0003] The traditional fixation method of the substitute prosthesis mainly relies on the fitting of the e...

AI Technical Summary

Problems solved by technology

However, stress concentration tends to occur at the connection part of the extension plate, which leads to fracture at the connection point; the lateral fixation of the extension plate changes the main force-bearing mode of the mandible, and makes its force nature change from the initial tension-compression stress to shear stress; The stress shielding effect prevents the covered mandibular area from receiving proper mechanical stimulation, resulting in atrophy of the connecting part of the mandible

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