Dental

Vitamin Dj has m.p. 115-117°C and D, m.p. 82 83 "C. Both vitamins, which have almost identical actions, are used for the prevention and cure of infantile rickets they are essential for the normal development of teeth, and are used for treating osteomalacia and dental caries. They are necessary for the absorption of Ca and P from the gut. 

The metal is slowly oxidised by air at its boiling point, to give red mercury(II) oxide it is attacked by the halogens (which cannoi therefore be collected over mercury) and by nitric acid. (The reactivity of mercury towards acids is further considered on pp. 436, 438.) It forms amalgams—liquid or solid—with many other metals these find uses as reducing agents (for example with sodium, zinc) and as dental fillings (for example with silver, tin or copper). 

Ethylene when deeply inhaled produces temporary anaesthesia which is almost devoid of unpleasant after-effects hence it has been used for dental surgery, minor operations, etc. 

The presence of fluorine as a soluble fluoride in drinking water to the extent of 2 ppm may cause mottled enamel in teeth, when used by children acquiring permanent teeth in smaller amounts, however, fluorides are added to water supplies to prevent dental cavities. 

It is used in coinage and is a standard for monetary systems in many countries. It is also extensively used for jewelry, decoration, dental work, and for plating. It is used for coating certain space satellites, as it is a good reflector of infrared and is inert. 

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