A text-book of dental histology and embryology, including laboratory directions . Section ground from 2, Fig, 92 (About 30 X) 130 AREAS OF WEAKNESS FOR ENAMEL MARGINS Fig. 95. Section ground from 3, Fig 92, through distal marginal ridge. (About 20 X) AREAS OF WEAKNESS FOR ENAMEL MARGINS 131 4 Fig. 96 ?jj ;•.. * *^«]i%3^0S6^M. H ^^^Bwr Section ground from Fig. 92, through mesial part and marginal ridge. If carieshas extended at the dento-enamel junction to A, the wall may be in the axial plane;if it has reached B, the wall must be inclined as indicated by the dotted line.(About 30 X) 132 AREAS
A text-book of dental histology and embryology, including laboratory directions . Section ground from 2, Fig, 92 (About 30 X) 130 AREAS OF WEAKNESS FOR ENAMEL MARGINS Fig. 95. Section ground from 3, Fig 92, through distal marginal ridge. (About 20 X) AREAS OF WEAKNESS FOR ENAMEL MARGINS 131 4 Fig. 96 ?jj ;•.. * *^«]i%3^0S6^M. H ^^^Bwr Section ground from Fig. 92, through mesial part and marginal ridge. If carieshas extended at the dento-enamel junction to A, the wall may be in the axial plane;if it has reached B, the wall must be inclined as indicated by the dotted line.(About 30 X) 132 AREAS OF WEAKNESS FOR ENAMEL MARGINS Figs. 98, 99, and 100 show the distal marginal ridge in a sec-ond molar. Notice the inclination of the rods from the tip ofthe dentine ridge. If decay has reached this point the wall Fig. 97 ;;^xv: JwKK <«»,afliBg^B Br. ? *jP- r • -?? ^•^^wHHpUte - iff A higher magnification of Fig. 96, showing enamel rod directions in the regionof the marginal ridge. must be inclined distally, so as to reach the rod direction,or a frail margin will be left and one which will not sustainthe force of mastication. Neglected caries in the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectteeth, bookyear1912
