Problems with Cobalt Alloy Powder Currently Used in Dentistry

Cobalt Alloy porcelain teeth Advantages: Cobalt alloy was first used for implant materials. Later, in Europe and the United States, in order to solve the allergic problem of nickel-containing metals, a cobalt-chromium alloy dedicated to porcelain restoration was developed, which does not appear alloy in the patient’s mouth. Discoloration. Cobalt-chromium alloy was first used in transplant medical treatment and used as a hip joint. This is also a sign of its biocompatibility, which is still in use today.

Metal additive manufacturing applications in dental processing require the use of metal powders that match the processing technology.

However, the cobalt-chromium alloy powder currently used in the manufacture of dental additive has the following problems:

1. Most of the cobalt-chromium alloy powders are processed by gas atomization method. The produced powder has poor sphericity, and there are many satellite spherical particles and poor fluidity, which directly affects the processing quality of additive manufacturing. Moreover, the cobalt-chromium powder prepared by gas atomization has a high oxygen content and a high nitrogen content, and the hollow ball is also present in the powder, resulting in pores inside the final molded part, which affects the use performance.

2. In order to ensure the subsequent mechanical properties, the current Stellite Plate powder will contain elements such as bismuth, cadmium and nickel, and the presence of these elements will affect the biocompatibility of the cobalt-chromium alloy. When the prosthesis is installed in the patient’s mouth, it will affect the patient’s health due to the precipitation of harmful metal ions.

3. The current cobalt-chromium alloy powders are basically produced for industrial production, so the physical and chemical parameters such as the particle size range and bulk density of the powder cannot be well matched with the additive manufacturing requirements.

Therefore, there is an urgent need for a method for preparing a cobalt-chromium alloy powder for dental additive manufacturing, which enables the prepared powder to meet the strict requirements of additive manufacturing and dental restoration.

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