. The Dental cosmos. 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. secondary calcification. As an experi-ment the section was placed in acid untildecalcification took place. Note that thiscalcified area (see a) has been decalcifiedto a lesser extent than the surroundingdentin, showing a marked retarding ac-tion on the part of the solidified dentin. 162 THE DENTAL COSMOS. In many cases of caries, then, when itsprogress has
. The Dental cosmos. 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. secondary calcification. As an experi-ment the section was placed in acid untildecalcification took place. Note that thiscalcified area (see a) has been decalcifiedto a lesser extent than the surroundingdentin, showing a marked retarding ac-tion on the part of the solidified dentin. 162 THE DENTAL COSMOS. In many cases of caries, then, when itsprogress has been slow, the pulp has beenhealthy, and the dentinal calcificationshave been complete, these secondarychanges have a marked effect upon theadvance of the carious process, inhibitingits progress toward the pulp. This maybe illustrated by Fig. 4, in which we seea cavity of caries in the occlusal surface ofa molar, the cavity having extended some face of the tooth to the pulp. Consider-able irritation is set up in the pulp bya large number of filling materials whichwe commonly use in the repair of cariousteeth. All the metals conduct heat moreor less readily, and a filling with a highconductivity, if placed in a cavity whichapproaches
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentist, bookyear1912
