General and dental pathology with special reference to etiology and pathologic anatomy; a treatise for students and practitioners . Fig. SS.—Area of normal dentin and enamel, a, dentin; b, enamel; c, c, dentoenameljunction; e, dentinal tubuli; /, series of interglobular spaces faintly reproduced. ENAMEL, DENTIN, AND CEMENT! M 219 The components ! enamel are the enamel rods and the confut-ing or interprismatic substance, the latter being the binding ma-terial which holds the rods together. This substance, like theenamel rods, of ectodermic origin, is a calcified stratified-squa- limus epitheliu
General and dental pathology with special reference to etiology and pathologic anatomy; a treatise for students and practitioners . Fig. SS.—Area of normal dentin and enamel, a, dentin; b, enamel; c, c, dentoenameljunction; e, dentinal tubuli; /, series of interglobular spaces faintly reproduced. ENAMEL, DENTIN, AND CEMENT! M 219 The components ! enamel are the enamel rods and the confut-ing or interprismatic substance, the latter being the binding ma-terial which holds the rods together. This substance, like theenamel rods, of ectodermic origin, is a calcified stratified-squa- limus epithelium. The rods are five- or six-sided and from threeand one-half to four and one-half microns in Length. Some ofthe rods may he traced from the dentoenamel junction to thesurface of the crown of the tooth. The cementing substance is. Fig. 89.—Area of normal dentin and enamel from ground section of area near apexof incisor of man. a, dentin, showing dentinal tubules; b, enamel; c, crack in enamelmade in grinding. more susceptible to the action of dilute acids than the enamelrods, so that if a section of enamel be subjected to dilute hy-drochloric or lactic acid, until the cementing substance is in partdissolved, a clear differentiation between enamel rods and ce-menting substance will be obtained. This is due to the factthat upon the removal of the cementing substance a greater dif-ference in the indices of refraction of the enamel rods and thedecreased cementing substance between them will have been es- 220 DENTAL PATHOLOGY tahlished Fiy. Examination of a ground section of a toothwith a 16 mm. objective does not render possible the detectionof the physical peculiarities of the individual rods or of the ce-menting substance. With a higher magnification, in a longi-tudinal section the individual rods appear
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpathology, bookyear19
