A text-book of dental histology and embryology, including laboratory directions . The dentition of a young adult. The third molars have not erupted.(About fifteen years.) THE GROWTH OF THE JAWS 403 the relation of the permanent incisors and cuspids to the tem-porary ones. In the lower jaw the temporary centrals havebeen lost and the permanent ones are forcing their waybetween the temporary laterals. The crowns of the centrals Fig. 313. Adult dentition. Note the distance from the apices of the incisors to the lowerborder of the mandible and the floor of the nose. are wider than those of the tee
A text-book of dental histology and embryology, including laboratory directions . The dentition of a young adult. The third molars have not erupted.(About fifteen years.) THE GROWTH OF THE JAWS 403 the relation of the permanent incisors and cuspids to the tem-porary ones. In the lower jaw the temporary centrals havebeen lost and the permanent ones are forcing their waybetween the temporary laterals. The crowns of the centrals Fig. 313. Adult dentition. Note the distance from the apices of the incisors to the lowerborder of the mandible and the floor of the nose. are wider than those of the teeth that were lost, and theyconsequently exert pressure upon the mesial surfaces of thelaterals, pushing them apart and carrying them upward andforward. Study the relation of the lower centrals, laterals, and 404 THE TEETH AND DEVELOPMENT OF THE FACE cuspids in the development of the arches at from six to tenyears. Notice that the roots of the central are not fullyformed, that the lateral lies to the lingual of the temporarylateral root, and with its mesio-occlusal angle below thedistal surface of the central. The development of the cuspidhas pushed the crypt floor through the cancellous boneuntil it has reached the solid cortical plate, and still the for-mation of the crown is not quite completed. The six teeth Fig. 314
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectteeth, bookyear1912
