A text-book of dental histology and embryology, including laboratory directions . Transverse section of enamel rods. (About 80 X)Fig. 13. Enamel showing direction of cleavage. (About 70 X) 48 THE STRUCTURAL ELEMENTS OF THE ENAMEL Relative Solubility of Enamel Rods and Cementing Sub-stance.—If a thin section of enamel cut parallel with thedirection of the enamel rods is mounted in water and hydro-chloric acid (2 per cent.) is allowed to run under the cover-glass and the action observed, it will be seen to attack thecementing substance more rapidly, dissolving it out frombetween the enamel rods
A text-book of dental histology and embryology, including laboratory directions . Transverse section of enamel rods. (About 80 X)Fig. 13. Enamel showing direction of cleavage. (About 70 X) 48 THE STRUCTURAL ELEMENTS OF THE ENAMEL Relative Solubility of Enamel Rods and Cementing Sub-stance.—If a thin section of enamel cut parallel with thedirection of the enamel rods is mounted in water and hydro-chloric acid (2 per cent.) is allowed to run under the cover-glass and the action observed, it will be seen to attack thecementing substance more rapidly, dissolving it out frombetween the enamel rods and attacking their sides. If theaction is stopped the ends of the rods will be seen pro-jecting like the pickets of a fence, as shown in the photograph(Fig. 14). The more dilute the acid the greater will be thedistance to which the cementing substance is removed beforethe rods are destroyed. Fig. 14 > The effect of acid on a section of enamel. Etching.—If a section of enamel is ground at right anglesto the direction of the rods, mounted in glycerin and photo-graphed, the outline of the rods will be seen with difficulty(Fig.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectteeth, bookyear1912
