tartar

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tartar

or

argol

(är`gəl), impure potassium hydrogen tartrate deposited as a crust in fermenting vessels during wine making. When purified, it yields cream of tartarcream of tartar,
white crystalline powder. Chemically it is potassium hydrogen tartrate, KC4H5O6, the acidic potassium salt of tartaric acid. It is used as the leavening agent in baking powders.
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. Tartar is the chief natural source of tartaric acidtartaric acid,
HO2CCHOHCHOHCO2H, white crystalline dicarboxylic acid. It occurs as three distinct isomers, the dextro-, levo-, and meso- forms.
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Tartar

 

solid deposits on the teeth of organic bases and salts (predominantly calcium phosphate) that have an irritating effect on the gums. Tartar appears on the necks of the teeth, but may also cover a considerable part of the crowns and roots; tartar can be deposited on dental prostheses when they are not cared for properly. Tartar forms when teeth are not cleaned sufficiently, fostering settlement on them of dental plaque (mucus, desquamated epithelium, microbes, food, and so on), which is then permeated with calcium salts that precipitate from the saliva. Tartar should be removed by a dentist to avoid gingivitis. It can be prevented by the normal act of chewing, the conscientious care of the teeth, and periodic examination by a stomatologist.

tartar

[′tärd·ər]
(medicine)

tartar

1. Dentistry a hard crusty deposit on the teeth, consisting of food, cellular debris, and mineral salts
2. a brownish-red substance consisting mainly of potassium hydrogen tartrate, present in grape juice and deposited during the fermentation of wine