Principles and practice of operative dentistry . dmasses scattered through the substance of the pulp, par-ticularly in the teeth of adults. They may be found inany part of the pulp-tissue, but most often in the coronalportion. In form they are irregularly nodulated, appear-ing to be made up of an aggregation of smaller structure they appear to be masses of calcific materialcomposed of the same elements as dentin, but lacking itspeculiar structure. Embedded within the calcific materialare numerous bodies made up of concentric rings, which are calcosphe-rites. Various irregular lines
Principles and practice of operative dentistry . dmasses scattered through the substance of the pulp, par-ticularly in the teeth of adults. They may be found inany part of the pulp-tissue, but most often in the coronalportion. In form they are irregularly nodulated, appear-ing to be made up of an aggregation of smaller structure they appear to be masses of calcific materialcomposed of the same elements as dentin, but lacking itspeculiar structure. Embedded within the calcific materialare numerous bodies made up of concentric rings, which are calcosphe-rites. Various irregular lines are seen running through the mass, whichmay be tubules or only faults in the structure. The formation of pulp-nodules is thought to be due to the depositionof masses of calcoglobulin within the pulp, and which is known to formthe base of the pulp-nodule,—the calcospherite, enamel, dentin, and bone,—the lime-salts entering into combination with the calcoglobulin to formcalcospherites, and these uniting in larger masses form the 392 OPERATIVE DENTISTRY. Wedl, Salter, Black, and other writers look upon their presence in thetissues of the pulp as a result of some form of peripheral irritation of thedentinal fibres, as, they are found in increasing numbers in the teeth ofthose who have suffered from caries, abrasion, erosion, inflammatory con-ditions of the pericementum, or other injury or disease. Figs. 491 and 492,which show a pulp-nodule in situ, are made from a pulp removed from atooth which was the subject of pyorrhoea alveolaris. Tomes does not quiteagree with this view, as he found globular masses in three out of five speci-mens of perfectly sound molar teeth removed post mortem from subjectsin the hospital morgue. Eobin and Magi tot called attention to the pres-ence of isolated calcareous granules of globular form which were scatteredthrough the substance of the pulp in the early stages of dentin and others have likewise described them as p
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