Preparation method of biological gradient coating on surface of dental implant

Abstract

The invention discloses a preparation method of a biological gradient coating on the surface of a dental implant. The method is used for performing operation of the following steps on the dental implant: polishing a titanium sheet by SiC metallographic abrasive paper, cleaning, drying, and setting the dried titanium sheet on the surface of the dental implant to form a titanium substrate layer; preparing an La-HA / TiO2 composite coating on the surface of the titanium substrate layer; preparing an HA coating on the surface of the La-HA / TiO2 composite coating; and setting the dental implant in an apatite / collagen solution containing La, thus forming the apatite / collagen coating on the surface of the dental implant. According to the invention, the La-HA / TiO2 composite coating is prepared on the titanium surface, so that the excessively high solubility of the HA coating is effectively lowered, the problem of instability between original HA and a metal interface is solved, and the chemical stability and the bonding force of the coating are improved; with the novel coating design, the biological activity and the solubility are improved in a gradient way from inside to outside, and the chemical stability and the bonding strength are improved in a gradient way from outside to inside.

Description

technical field [0001] The invention relates to the field of biomedicine, in particular to a method for preparing a biogradient coating on the surface of a dental implant. Background technique [0002] Titanium has good mechanical properties and biocompatibility, and is a commonly used metal implant material in biomedicine. However, the biological activity of titanium is poor, and the combination with the surrounding bone tissue after implantation in the body is only a mechanical fit, which cannot form effective osseointegration, and it is prone to loosening and falling off after implantation in the body. Therefore, the modification of the surface of titanium implants has become a hot spot in the research of biomaterials in recent years. Among them, hydroxyapatite bioceramics (hydroxyapatite, referred to as HA), which has similar chemical composition and crystal structure to human bone inorganic substances, is widely used on the surface of titanium metal due to its excellen...

AI Technical Summary

Problems solved by technology

However, these studies have not changed the essence of single-character coatings, and cannot meet the requirements of coatings in terms of binding strength, biological activity, and solubility.

With the increasing clinical requirements for implants and the continuous development of biomaterials research, a single coating can no longer meet clinical needs. It is necessary to obtain ideal biological activity, solubility, Mechanical properties and bond strength are almost impossible

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