Principles and practice of operative dentistry . Fig. 274.—Undermining caries of enamel, showing transparent zone of Tomes at ^-1. (R. R. Andrews.). Fig. 276.—Dentinal tubules from infected dentin, showing enlargement of the tubules and thepresence of micro-organisms within them. (Tomes.) DENTAL CARIES. 173 In cases of rapid caries, Williams found streptococci almost alwayspresent, while in caries of slow progress (backward decay) the largecocci and diplococci were always found. In the direct caries of enamelthe cavities are lined with leptothrix and thread-like forms. The leptothrix Buccalis
Principles and practice of operative dentistry . Fig. 274.—Undermining caries of enamel, showing transparent zone of Tomes at ^-1. (R. R. Andrews.). Fig. 276.—Dentinal tubules from infected dentin, showing enlargement of the tubules and thepresence of micro-organisms within them. (Tomes.) DENTAL CARIES. 173 In cases of rapid caries, Williams found streptococci almost alwayspresent, while in caries of slow progress (backward decay) the largecocci and diplococci were always found. In the direct caries of enamelthe cavities are lined with leptothrix and thread-like forms. The leptothrix Buccalis maxima and the bacillus Buccalis maximus ofMiller are nearly always found, the latter more sparingly. Beneath the felt-like masses of thread-forms, and lying in contact withthe decomposing enamel in direct decay, and also in deep cracks and fis-sures in backward decay, there is invariably found a short, thick bacillus,usually constricted in the centre. Williams suggests that possibly the variety of the organism found inthese forms of enamel decay may be the governing factors in the rapidityof the progress with which dissolution of the ename
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdentist, bookyear1920
