Principles and practice of operative dentistry . paces (Figs. 292 and 293), and exposure of the pulp takes placebefore lateral spreading has progressed to any great extent. This is espe-cially true of teeth of the best development, for observation proves thatexposure of the pulp will occur in this class of teeth with the least destruc-tion of tissue. The more perfect the development the more completelywill the penetration be confined to the direction of the tubules. (Black.) CARIES OF CEMENTUM. The etiology of caries of ceinentuin is so nearly like that of decay ofdentin that it hardly needs a
Principles and practice of operative dentistry . paces (Figs. 292 and 293), and exposure of the pulp takes placebefore lateral spreading has progressed to any great extent. This is espe-cially true of teeth of the best development, for observation proves thatexposure of the pulp will occur in this class of teeth with the least destruc-tion of tissue. The more perfect the development the more completelywill the penetration be confined to the direction of the tubules. (Black.) CARIES OF CEMENTUM. The etiology of caries of ceinentuin is so nearly like that of decay ofdentin that it hardly needs a special description, except that which growsout of the difference in the histologic structure. Decalcification is causedby the same micro-organisms that produce caries of dentin. The fungi firstattack the calcified rods known as Sharpeys fibres, and penetrate to thecement-corpuscles and their canaliculi, decalcifying the surrounding tissueas in decay of dentin. The organic substance is then liquefied by thesaprophytic bacteria and washed 290.—Longitudinal section of infected human dentin, showing the pipe-stem appearance of thetubules described by Tomes. (R. R. Andrews.)
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectdentist, bookyear1901
