General and dental pathology with special reference to etiology and pathologic anatomy; a treatise for students and practitioners . nt two-thirds the distance from the neck of the tooth to thecutting or occlusal surface. In the teeth of the uncivilized racesin which dental caries is so much less frequent than in the teethof the modern races, the imbrication lines are less marked. In ENAMEL, DENTIN, CEMENTUM 225 fact, he says, the enamel of the teeth of the primitive races ismore lustrous, and the imbrication Lines arc so feeble that they.•an qo1 be out by the graphite method of s
General and dental pathology with special reference to etiology and pathologic anatomy; a treatise for students and practitioners . nt two-thirds the distance from the neck of the tooth to thecutting or occlusal surface. In the teeth of the uncivilized racesin which dental caries is so much less frequent than in the teethof the modern races, the imbrication lines are less marked. In ENAMEL, DENTIN, CEMENTUM 225 fact, he says, the enamel of the teeth of the primitive races ismore lustrous, and the imbrication Lines arc so feeble that they.•an qo1 be out by the graphite method of staining. In-asmuch as the more susceptible to caries a tooth is, the moremarked arc the imbrication lines and the deeper are the fur-rows between them, the conclusion is reached that the characterof the external surface of the enamel as to the presence of mi-croscopic <ni<l macroscopic unevennesses is one among many factorswhich determines the susceptibility of the tooth to dental caries. Theless smooth the surface of the enamel, the more difficult it be-comes to maintain these surfaces free from food deposits, saliva. Pig. 95_—Calcarine fissures on the surface of a malacotic molar (Pickerill). or salivary mucin. In addition to these imbrication lines uponthe surface of the enamel which are apparently external mani-festations of the thickness, the uneven lengths and numberof the bands of Retzius, the enamel also presents fissures whichare short and numerous, and which run more or less at rightangles to the horizontal imbrication lines. These should be des-ignated as Picket-ills calcarine fissures. They are present ingreatest numbers on the mesial and distal surfaces and on thosepoints Avhere the ridges are most marked, , at a point one-halfthe distance between the cervix and the occlusal surface (). Shallow long fissures and deep fissures, which may run eitherparallel with or at right angles from the long axis of the tooth, 226 DENTAL PATHOLOGY are also pres
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpathology, bookyear19
