BIBBY, BASIL. G.: School of Medicine and Dentistry, University of Rochester, Rochester, N. Y. (May 5, 1938).

On the enamel surface, accumulations of filamentous organisms and Gram- positive and Gram-negative cocci are prominent, some of them producing high concentrations of acids from carbohydrates, and therefore may be considered potential causes of enamel decalcification. There are great variations in per­centages of the various types of microorganisms in carious cavities, indicating absence of a specific bacterial cause of caries. The organic structures of enamel resist bacterial destruction. Characteristic formations of acid-resist­ant material—most marked in old teeth—are present in the superficial layers of the enamel surface of caries-resistant teeth. A certain type of pigmented plaque on teeth is associated with lessened susceptibility to caries.

References: J. Den. Res., 1931, 1932, 1934; J. Am. Den. Assoc., 1933, 1935; J. Am. Col. Den., 1935 ; A study of the filamentous bacteria of the mouth, Ph.D. Thesis, University of Rochester, 1935.

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