Principles and practice of operative dentistry . ace,and particularly at the angles of the crown, numerous short rods are found,which extend only a little distance from the surface, and fill in the inter-spaces between the longer rods caused by the increase in the circumfer-ence of the outer surface and the turning of the angles. A section of enamel viewed from the ends of the rods or prisms has theappearance of a finely tessellated pavement (Fig. 133). The rods are hex-agonal in outline (Fig. 131, A), and are separated from each other by aninterprismatic substance, the nature of which has for
Principles and practice of operative dentistry . ace,and particularly at the angles of the crown, numerous short rods are found,which extend only a little distance from the surface, and fill in the inter-spaces between the longer rods caused by the increase in the circumfer-ence of the outer surface and the turning of the angles. A section of enamel viewed from the ends of the rods or prisms has theappearance of a finely tessellated pavement (Fig. 133). The rods are hex-agonal in outline (Fig. 131, A), and are separated from each other by aninterprismatic substance, the nature of which has formed a subject formuch discussion (Fig. 131, B). The individual enamel-rods appear under the higher powers of themicroscope to be regularly varicosed, the varicosities not interdigitating asformerly taught, but opposite each other, and the interspaces filled withthe interprismatic substance (Fig. 135). Transverse Striations.—With the exception of faint transverse stria-tions, the enamel-rods seem to be structureless. Hertz claimed this appear-. Fig. 130.—Dentinal sheaths, the residue which remains after decalcification of dentin with strong acids. X 70.
Size: 1378px × 1813px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectdentist, bookyear1920
