A text-book of dental histology and embryology, including laboratory directions . An occlusal defect in a worn tooth. The fissure is filled with coronal cementum. The crown was sawed through from buccal to lingual, asshown in Fig. 81, and the piece marked 1 is shown inFigs. 82 and 83. The grooves are open two-thirds of thedistance to the dento-enamel junction, and show slightaction of caries. Suppose caries had started in the centralpit, and a small round filling had been made, open defectswould be left at the margin where every groove radi- STRUCTURAL DEFECTS IN THE ENAMEL 119 ated from the c
A text-book of dental histology and embryology, including laboratory directions . An occlusal defect in a worn tooth. The fissure is filled with coronal cementum. The crown was sawed through from buccal to lingual, asshown in Fig. 81, and the piece marked 1 is shown inFigs. 82 and 83. The grooves are open two-thirds of thedistance to the dento-enamel junction, and show slightaction of caries. Suppose caries had started in the centralpit, and a small round filling had been made, open defectswould be left at the margin where every groove radi- STRUCTURAL DEFECTS IN THE ENAMEL 119 ated from the central cavity, and these would be just asliable to recurrent decay as it was originally, and, if cariesoccurred, it would progress at the depth of the groove,reach the dento-enamel junction, and progress in the dentine, Fig. 85. Higher magnification of Fig. 84. The fissure filled with granular calcified the direction of the bands of Retzius around the fissure. until the occlusal enamel was so undermined that it wouldbreak in under the force of mastication. On the other hand,if the grooves are cut out to a point where the cavity margin 120 STRUCTURAL DEFECTS IN THE ENAMEL will be on a smooth surface, there is no possibility of recur-rent caries if the filling material is properly inserted. Thisone illustration, which might be duplicated a thousand times,
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectteeth, bookyear1912
