How Well Do You Know Your Dental Alloys?
On July 2, 2020, a Colombian customer released an inquiry form for nickel-chromium dental alloys on Alibaba. After detailed quotation, confirm the material, size and quantity, and finally confirm this order. On July 4th, we shipped nickel-chromium dental alloys to customers.
What are the materials of the dental alloy?
Dental alloys containing nickel, cobalt and/or chromium are widely used for dental restorations. Ni-Cr alloys usually contain 69-81% nickel, while Co-Cr alloys mainly contain less than 1% nickel. The main components of these alloys are Co (60–65%), Cr (27–30%) and Mo (5–6%). Another group of non-precious metal dental alloys is stainless steel with about Cr. 18% Cr and 8% Ni.
With the continuous advancement of casting porcelain technology, medical alloys are playing an increasingly important role. The currently used nickel-chromium dental alloy and its processing technology are safe.
1.1 Compositions, Forms, and Uses Dental alloys are diverse in composition, ranging from nearly pure gold and traditional gold-based alloys to alloys based on silver, palladium, nickel, cobalt, iron, titanium, tin, and other metals (Table 1). The types of dental alloys available to the dental practitioner have increased dramatically since the start of the 1980s in response to changes in the market price of gold and palladium, the need for increasingly specialized physical properties, and an increase awareness of biological properties. Dental alloys are commonly custom precision-cast for restoration of missing tooth structure, but wrought forms (shaped by the manufacturer or the clinician) are also common, and dental amalgam is an alloy that forms in situ in a tooth cavity preparation after mixing of a Ag–Sn alloy with mercury.
Table 1. Common types of alloys in dentistry and their major component elements.
|Alloy type||Uses in dentistry||Other major elements|
|Gold-based||Cast restorations, solders||Ag, Cu, In, Pd, Pt, Zn|
|Palladium-based||Cast restorations||Ag, Ga, Cu|
|Silver-based||Cast restorations, solders||Pd|
|Cobalt-based||Cast restorations||Cr, Mo, Fe, C, Si, Mn|
|Nickel-based||Cast restorations, orthodontic materials||Mo, Fe, C, Be, Mn|
|Titanium-based||Implants||O, N, C, Fe, H|
|Iron-based||Implants, orthodontic materials, instrumentation||C, Ni, Cr|
|Mercury-based||Amalgam (direct restorations)||Ag, Sn, Pd, Cu, In|
Dental alloys are used in a variety of applications, ranging from restorations (either permanent or temporary) to files, instruments, and burs for tooth modification or to guide tooth movement. Because of these many uses, the environments in which the alloys must function are diverse, as are the physical requirements of the alloys. For example, an orthodontic wire is required to have a relatively high flexibility (a low modulus) and the ability to be bent and shaped. However, the alloy for a dental restoration should have almost no flexibility (a high modulus) and be hard and difficult to deform. Alloys may be used outside of the mouth, inside the mouth, or may be implanted into the bone or soft tissue. Alloys may be present for only a few minutes, as in the case of an endodontic file, or may be permanently cemented for decades. The biological requirements for each of these uses may vary considerably.
Eternal Bliss Alloy Casting & Forging Co, Ltd.
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