With the progress of the society, more and more materials for oral shell making dentures, metal, plastic, composite resin, ceramic etc..
The metal material used for making dentures are mainly co Cr alloy, Ni Cr alloy, near alloy, this year and the emergence of pure titanium and Titanium alloy valve.
Titanium is a metal having a high degree of chemical activity. However, it emerged in many corrosive media particularly excellent corrosion resistance. The reason is titanium and has a good affinity for oxygen, react with oxygen to produce highly strong and dense layer of oxide film on the surface of the blunt.
没有评论:
发表评论