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Periodontal Disease And Dental: Many independent investigators were studying plaque, the deposit always present on all surfaces of the teeth, except those areas cleaned by mastication. Because plaque plays an important role in both dental caries (cavities) and calculus (tartar) deposition, a thorough knowledge of plaque formation and composition is essential to an understanding of the causes of both periodontal disease and dental caries.
Mycoplasmosis is a respiratory disease caused y the bacteria Mycoplasma gallisepticum. It is Iso known as air sac disease or chronic respira-jry disease. Those affected with the disease may how nasal discharge, watery eyes, and respira-)ry difficulty. This disease is often associated /ith other respiratory diseases. It is transmitted hiefly from infected hens to their chicks through le eggs. The disease can also be transmitted by ontact with infected individuals, but it spreads ery slowly in this manner. The disease can best e controlled by maintaining breeding flocks free f the disease by strict measures of isolation and mitation. Chicks hatched from such flocks can egin life free of the disease.
A deficiency of zinc in the diets of men in certain Middle Eastern countries was a surprising but valuable finding. Those suffering from this deficiency had retarded growth and sexual development as well as certain diseases that caused a loss of blood. The role of fluorine in preventing dental decay was firmly established and, in addition, this element appeared to be needed in the diet for proper hardening of bones. (See Year in Review: MEDICAL SCIENCES, Dental Science, Other Developments in Dental Science.) New studies also indicated the importance of magnesium in human nutrition for, among other things, normal nerve function and bone structure.
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