A text-book of dental histology and embryology, including laboratory directions . thestriation rendered more apparent. In caries of great inten-sity but low liability the reduction in the diameter of theenamel rods is rapid, and they are soon destroyed, whilethe area of the surface attacked is small (Fig. 122). In caries of low intensity but great liability the diameterof the rods is slowly reduced, while the area of surfaceattacked, and consequently the area of disintegration, islarge (Fig. 123). These conditions should be studied in themacroscopic appearance of caries at the chair. The decal
A text-book of dental histology and embryology, including laboratory directions . thestriation rendered more apparent. In caries of great inten-sity but low liability the reduction in the diameter of theenamel rods is rapid, and they are soon destroyed, whilethe area of the surface attacked is small (Fig. 122). In caries of low intensity but great liability the diameterof the rods is slowly reduced, while the area of surfaceattacked, and consequently the area of disintegration, islarge (Fig. 123). These conditions should be studied in themacroscopic appearance of caries at the chair. The decalcified dentine matrix shrinks and more or lessof a space is formed under the enamel. The action of the acid follows the tubules of the dentinetoward the pulp, and spreads through their branches later-ally near the dento-enamel junction so that the form of thedisintegrated dentine is always that of a cone, with the baseat the dento-enamel junction and the apex toward the pulpchamber. It is important, however, to remember that in 158 THE EFFECT OF CARIES ON THE EX A MEL Fig. 122. A tooth split through a spot, showing great intensity but low liability Fig. 123
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectteeth, bookyear1912
