Metal titanium to form titanium ore is hidden in the earth's crust, its rich reserves, about 1.52 billion tons. The reserves of titanium occupy the ninth place among the elements, and are ranked fourth in the metal element after aluminum , iron and magnesium . China's titanium reserves are about 480 million tons, ranking first in the world. This is the application of titanium in China, especially for the oral restoration of titanium.
Industrial titanium has pure titanium and titanium alloys. Pure titanium has 4 grades (Chinese grades have TA0, TA1, TA2, TA3). There are more than 20 kinds of titanium alloys, and new titanium alloys are constantly available according to the needs of the application.
Pure titanium is used for oral restoration to maintain excellent biocompatibility and has a certain strength. It is suitable for making denture base, mast, tongue and full crown. A certain width and thickness should be ensured when making the snap ring and the support, otherwise it will be easy to break.
In order to increase the strength of the titanium material, lower the melting point, and ensure the quality of the denture bracket, a titanium alloy can be selected. The most commonly used titanium alloys are Ti-6Al-4V, in addition to Ti-13Cu, Ti-25Pd-5Cr, Ti-20Cr-0.2Si and the like. Ti-6Al-7Nb, Ti-18.6Co and Ti-25Ag developed in the United States, and Ti-Zr-Al-Mo (Ti-75) developed by the Northwest Institute of Nonferrous Metals in China have good biocompatibility. However, the above alloys still contain elements Al and V which are harmful to the human body. The most promising titanium alloy is Ti-Zr alloy, and the Zr element is also harmless to the human body.
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