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dental tartar
dental tartar precipitate of saliva that accumulates around teeth at the gum line. Composed primarily of calcium salts, tartar forms as a hard brownish substance that irritates gums and causes them to recede. Inflammation of this tissue may lead to the recession and infection of the bones in whic...
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D
D fourth letter of the alphabet . It corresponds to the Greek delta. It is a usual symbol for a voiced dental or, as in English, alveolar stop. The capital represents in musical notation a note in the scale and in Roman numerals the number 500.
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N
N 14th letter of the alphabet . It is a usual symbol for a voiced alveolar (or dental) nasal, as in the English not. The diagraph ng represents a different sound, a voiced velar nasal, as in the English sing. The corresponding Greek letter is nu. In chemistry N is the symbol for the element ...
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William John Gies
William John Gies , 1872-1956, American biological chemist, b. Reisterstown, Md., grad. Gettysburg College (B.S. 1893; Ph.D. Yale, 1897). He began teaching at Columbia in 1898 and served as secretary of the faculty of the College of Physicians and Surgeons (1905-21). He was instrumental in establish...
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biofeedback
biofeedback method for learning to increase one's ability to control biological responses, such as blood pressure, muscle tension, and heart rate. Sophisticated instruments are often used to measure physiological responses and make them apparent to the patient, who then tries to alter and ultimatel...
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gingivitis
gingivitis , inflammation of the gums. It may be acute, subacute, chronic, or recurrent. The gums usually become red, swollen, and spongy, and bleed easily. Chronic gingivitis is the usual form, resulting from irritating bacteria or debris, food impaction, or poor dental restoration. It can also acc...
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South Charleston
South Charleston city (1990 pop. 13,645), Kanawha co., W W.Va., on the Kanawha River, in a highly industrialized area; settled 1782, inc. 1917. Machinery, electrical products, chemicals, transportation and dental equipment, and foods are manufactured. A large Native American mound is in the city.
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dentistry
dentistry treatment and care of the teeth and associated oral structures. Dentistry is mainly concerned with tooth decay, disease of the supporting structures, such as the gums, and faulty positioning of the teeth. Like medicine and surgery, it is practiced in specialized fields: oral surgery, or...
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George Eastman
George Eastman 1854-1932, American inventor, industrialist, and philanthropist, b. Waterville, N.Y. By mass production of his photographic inventions, Eastman enormously stimulated the development of photography as a popular hobby. He invented a dry-plate process and established (1880) a factory at...
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University System of Maryland
University System of Maryland state-supported system of higher education in Maryland, est. 1988 as the University of Maryland System, renamed 1997. It includes all but two of the publicly supported colleges and universities in the state: Bowie State Univ; Coppin State College; Frostburg State Univ....
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