A text-book of dental histology and embryology, including laboratory directions . 4 t^^^mw% WW0W ?????^???? wma ?- ••.?:•??? Hypertrophy of the cementum on the side of the root of a lower molar near theneck of the tooth. From a lengthwise section, man: a, dentine; 6, cementum; c,fibers of peridental membrane. From b to c the cementum is normal and the incre-mental lines fairly regular, but at d one of the lamellae is greatly thickened. At cthis lamella is seen to be about equal in thickness with the others. The next twolamellae are thin over the greatest prominence, but one is much thickened a
A text-book of dental histology and embryology, including laboratory directions . 4 t^^^mw% WW0W ?????^???? wma ?- ••.?:•??? Hypertrophy of the cementum on the side of the root of a lower molar near theneck of the tooth. From a lengthwise section, man: a, dentine; 6, cementum; c,fibers of peridental membrane. From b to c the cementum is normal and the incre-mental lines fairly regular, but at d one of the lamellae is greatly thickened. At cthis lamella is seen to be about equal in thickness with the others. The next twolamellae are thin over the greatest prominence, but one is much thickened at g, andboth at h. These latter seem to partially fill the valleys which were occasioned bythe first irregular growth. (1 in. obj.) Fig. 148. waWMiSliilSm Hypertrophy from root of cuspid, man, in which the irregularity is confined tothe first lamella: o, dentine; b, thickened first lamella; c, subsequent lamellae, whichare seen to be fairly regular. (1 in. obj.) 192 THE CEMENTUM instance, a number of layers may be formed within a shorttime, and again, a considerable time may elapse between theformation of one layer and the next. The time, however,does not seem to determine the thickness of the laver. Fig. $&Mlfe: mm W$&K* Apex of root of an upper bicuspid tooth with irregularly developed cementum:a, a, dentine; b, b, pulp canals. The lamelte of cementum are marked 1, 2, 3, 4, 5,6, 7, 8, 9; d, d, d, absorption areas that have been refilled with cementum. It willbe seen that the apices of the roots were originally separate, but became fused withthe deposit of the second lamella of cementum, and that in this the irregular growthbegan and was most pronounced. It has continued through the subsequentlamellae, but in less
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectteeth, bookyear1912
