. The Dental cosmos. dentinal fibrillar for a shortdistance into the enamel is also evident,as before mentioned. Fig. 2 presents a picture of a toothaffected with both abrasion and each area a change in the den-tin is notable, extending to the pulpalwall. This change is apparent in thesection because of its difference in refrac-tion to light, produced by the increaseddensity of these areas due to secondarycalcifications of the dentinal tubuli. Oncomparison of the two areas, it will beseen that the zone of calcification beneaththe abrasion is much denser than thatbelow the erosi
. The Dental cosmos. dentinal fibrillar for a shortdistance into the enamel is also evident,as before mentioned. Fig. 2 presents a picture of a toothaffected with both abrasion and each area a change in the den-tin is notable, extending to the pulpalwall. This change is apparent in thesection because of its difference in refrac-tion to light, produced by the increaseddensity of these areas due to secondarycalcifications of the dentinal tubuli. Oncomparison of the two areas, it will beseen that the zone of calcification beneaththe abrasion is much denser than thatbelow the erosion. The pulp has alsothrown up a small amount of secondarydentin at a point opposite the former,while none is visible beneath the bears out the statement that thesesecondary changes are more readily andmore completely formed under areas of abrasion than under those of erosion,other things being equal. It is likelythat the irritation of the acids of erosionare so severe that degenerations are pro- Fig. duced in the pulp, rather than construc-tive changes. The resistance which the transparentzone offers against acids is seen in , in which there is shown a section ofdentin a portion of which has undergone Fig. 10.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentist, bookyear1912
