Identifier: textbookofdent00noye (find matches)
Title: A text-book of dental histology and embryology, including laboratory directions
Year: 1912 (1910s)
Authors: Noyes, Frederick Bogue
Subjects: Teeth
Publisher: Philadelphia and New York, Lea & Febiger
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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colony on the surface has been intermittent (PlatesV, VI, VII). The boundary between the perfect and the disintegratedarea is usually marked by a darker area, the significanceof which is not now understood. If the disease progressescontinuously the affected tissue always appears white byreflected light, but if the progress has been intermittent,especially if there have been considerable periods in whichno colony has been attached to the surface, the area darkens,becoming brownish or almost black. This is produced byorganic materials filling the space between the enamel rodsand decomposing, with the probable formation of sulphidesof dark color in the spaces. If immunity to caries is attainedbefore the effect upon the tissue has penetrated to the dento-enamel junction, this will occur, and the spot changes froma white to a brownish or black color. Such spots will befound in some places on most teeth extracted from immunepersons. Work of Dr. Miller has indicated that such spots Fig. 119
Text Appearing After Image:
A section through a white spot in the first period of attack: X, disintegratedenamel; E, sound enamel; D, dentine. STAGES IN THE PROGRESS OF CARIES 155 are more resistant to the progress of caries than perfectenamel surfaces. At any time during the first period, there-fore, the destruction may be arrested by the coming of Fig. 120

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