3D-printed short implant with gradient and porous outer layer and preparation method for 3D-printed short implant

Abstract

The invention discloses a 3D-printed short implant with a gradient and porous outer layer and a preparation method for the 3D-printed short implant. The short implant is used for being implanted into an alveolar bone implantation pit of a sufferer and comprises a head part and a somatic part connected with the bottom surface of the head part; the somatic part comprises a dense core and a porous layer arranged outside the dense core; the porous layer has pores; along a direction from the dense core to an alveolar bone, the porosity of the porous layer is improved gradually, and the elastic modulus of the porous layer is decreased gradually from that close to or equal to that of the dense core; and the global mean modulus of elasticity of the porous layer is the same as the mean bone modulus of elasticity of the sufferer. The short implant is prepared through integrated molding by a 3D printing technology; and due to the porous layer, the bone binding area is increased, the binding between the short implant and the alveolar bone is facilitated, the long-term stability of the short implant is facilitated, and more loads can be born even if the height of the alveolar bone is insufficient. Simultaneously, the porous layer can load drugs to induce rapid growth of bone tissue, and the short implant is applied to hypodontia-suffered sufferers with insufficient bone mass of upper and lower molar regions.

Description

technical field [0001] The invention relates to the technical field of oral implants, in particular to a 3D printed short implant with gradient outer layers and a preparation method thereof. Background technique [0002] At present, oral implant restoration has become one of the routine repair methods for dentition defects and missing. In the process of oral implant restoration, the doctor needs to drill holes in the edentulous area of ​​the patient's alveolar bone to prepare a suitable implant socket, and then place the implant into the prepared implant socket. However, in clinical work, doctors usually need to use bone grafting to increase the height of the bone or implant short implants due to insufficient alveolar bone volume or limitations of the cavity, sinus, neural tube and other factors. The application of short implants avoids the risks, time, and money costs of bone grafting, and has obvious advantages over conventional implants for patients with insufficient alv...

AI Technical Summary

Problems solved by technology

The existing short implants have the following problems: (1) The elastic modulus of titanium alloy is much higher than the elastic modulus of bone, and the stress shielding effect is easy to occur at the interface between the implant and bone tissue. Dislocation; (2) The implant cannot support the denture function for a long time due to its short length, less osseointegration area, and low strength

However, most of the existing porous implants have a uniform pore structure, and their structure and mechanical properties are uniform in space. The elastic modulus of the part of the porous structure close to the dense core is low, and it is difficult to stably support the dense core; The elastic modulus on both sides of the dense core contact interface is quite different, which will cause stress concentration

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