. The science and practice of dental surgery. Fig. i2H.—ihotograph of a cross-soctiuii of a pre-molar, showing broad whitened areas of caries ofenamel on the approximal surfaces. (G. V. Black :Operative Dentistry.) decalcification is greater under the olderzoogloea formation in the centre of the opacjuespot than under the more recent i^eripheralportion. Owing to the softening of the dentineand to consec|uent secondary caries of enamel, ^iiiiiiiiiiiiiiiiiiiuiijDjjjjg- / ViiiSiJSSiiSilSffllli^Fig. Fig. 430. A diagrammatic representation of caries of the buccasurfaces, Fig. 429, and of cros
. The science and practice of dental surgery. Fig. i2H.—ihotograph of a cross-soctiuii of a pre-molar, showing broad whitened areas of caries ofenamel on the approximal surfaces. (G. V. Black :Operative Dentistry.) decalcification is greater under the olderzoogloea formation in the centre of the opacjuespot than under the more recent i^eripheralportion. Owing to the softening of the dentineand to consec|uent secondary caries of enamel, ^iiiiiiiiiiiiiiiiiiiuiijDjjjjg- / ViiiSiJSSiiSilSffllli^Fig. Fig. 430. A diagrammatic representation of caries of the buccasurfaces, Fig. 429, and of cross-sections of thecrowns. Fig. 430, of tlie lower first and secondpremolars and first and second molars, showingthe location of caries and tendency to spread ina direction aroimd the crowns of the teeth,following the free margin of tlie gingivae. InFig. 429 the dotted line represents the gingivalline, or Ime of the attachment of the gum tissueto the teeth. The continuous dark line representsthe line of the free margin of the gingivae, whicharches toward tlie occlusal surface in passingbetween the teeth. The double Ime representsa saw-cut dividing the crowns through the areasof carious enamel. Fig. 430 represents the areasof carious enamel exposed by cutting away thecrowns. The portions darkened represent theparts of the enamel most liable to caries, whilethe areas left white at the medio- and disto-buccalangles of the teeth represent areas that are almostalways immune to caries. (G. V. Black :
Size: 3217px × 777px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentistry, bookyear19
