An intraosseous dental implant resistant to fretting damage

Abstract

The invention discloses a fretting-resistant intraosseous dental implant, which consists of a foundation post (3), a neck (1) and a body (2) with external threads, wherein the neck (1) of the implant The peripheral surface of the body is divided into four regions: lingual area (A), buccal area (B), mesial area (C), and distal area (D); the mesial area (C) and the distal area (D) are Coated with hydroxyapatite / tetragonal zirconia composite ceramic coating, lingual area (A) and buccal area (B) are coated with hydroxyapatite coating; the thread teeth of the external thread of the body (2) Both the crest (2a) and the thread bottom (2b) are arc-shaped, and the two arcs are connected smoothly, and the curvature radius of the thread crest (2a) is 1 / 4-1 / 6 of the radius of the body (2) , the arc radius of the thread bottom (2b) is 1 / 3-1 / 4 of the arc radius of the thread crest (2a). The implant has good anti-fretting damage performance, a high success rate of the dental implant, and a long service life.

Description

technical field [0001] The invention relates to a dental implant for oral cavity restoration, in particular to an intraosseous dental implant. Background technique [0002] Due to diseases, trauma and natural aging, hundreds of millions of patients in China alone need to receive oral restoration treatment. At present, the main method of restoration is to use dental implants for restoration. Among dental implants, intraosseous implants are the most effective and widely used. An intraosseous dental implant consists of two parts: a dental implant implanted in the human jawbone for support and retention, and a crown for mastication. When implanting, the cylindrical dental implant with external thread made of pure titanium and other metals is first implanted into the alveolar bone, and the dental implant and the alveolar bone are connected to each other through thread fit. (Generally about 3 months), and then a crown is mounted on the foundation post above the neck of the dent...

AI Technical Summary

Problems solved by technology

However, the peripheral surface structure and mechanical properties of the existing dental implant neck are the same, which cannot match the anisotropic properties of the cortical bone tissue in direct contact with it, so that the cortical bone that the implant turns over is prone to fretting damage. And the degree of damage in the mismatched area is more serious, which seriously affects the service life of the implant

[0004] On the other hand, because the thread shape of the existing dental implant is a shape with a straight line such as a triangle or a zigzag, a flat surface appears at the connection interface between the body of the implant and the cancellous bone of the alveolar bone. When the implant is stressed, the plane contact area is prone to tangential micro-movement along the connection plane direction, resulting in furrow damage and delamination damage of bone tissue; at the same time, the sharp turning point between the connection planes is also prone to stress Concentration, forming shear damage, accelerating the loosening and failure of dental implants

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