Principles and practice of operative dentistry . Fig. 276.—Dentinal tubules from infected dentin, showing enlargement of the tubules and thepresence of micro-organisms within them. (Tomes.) DENTAL CARIES. 157 It is still, however, an open question as to whether the transparentzone is or is not a real zone of resistance to the encroachment of the dis-ease and effective in retarding its progress. Clinical observation and ex- Fio. Longitudinal ground-section of crown of an inferior molar of a negro. This figure is drawn from aground and polished section mounted in Canada balsam. (Gysi.) E,
Principles and practice of operative dentistry . Fig. 276.—Dentinal tubules from infected dentin, showing enlargement of the tubules and thepresence of micro-organisms within them. (Tomes.) DENTAL CARIES. 157 It is still, however, an open question as to whether the transparentzone is or is not a real zone of resistance to the encroachment of the dis-ease and effective in retarding its progress. Clinical observation and ex- Fio. Longitudinal ground-section of crown of an inferior molar of a negro. This figure is drawn from aground and polished section mounted in Canada balsam. (Gysi.) E, enamel; D, dentin ; C, cement; p,pulp-chamber; a, large decay, from the grinding surface; b, small decay, from the mesial surface; cs,7one of septic invasion and discoloration; e, partially decalcified and discolored enamel around thecarious cavity ; 2, dark zones ; s, clearer zones; zp, oldest zones, where putrefaction of the tooth-cartilage begins ; c, outer transparent zone, or zone of Tomes ; sd, secondary dentin, caused by irritation ;sd, secondary dentin deposited by normal physiological process, recession of the pulp. perience would seem to indicate that it has an effect upon the dentinwhich renders it more resistant to the progress of the disease. Expansion of the Tubuli,—Sections of carious dentin cut parallelwith the long axis of the tubuli, which have been stained with fuchsin or 158 OPERATIVE DENTISTRY gentian v
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectdentist, bookyear1901
