. The Röntgen rays in medical work . ed by a faint shadow at the neck of the crown. Thiscurious pathological condition, the cause of which is not exactlyknown, is in its usual site partly above and partly beneath gum. 8. Upper bicuspid: eccentric distortion of fang. This shape isthe result of pressure of neighbouring teeth in process of develop-ment. Absorption going on in centre of single fang is indicatedby the darker area; that is, the thin plate of tooth substance hasoffered little resistance to the rays. 9. Upper central incisor : half the fang absorbed ; small carious MEDICAL AND SURGICA
. The Röntgen rays in medical work . ed by a faint shadow at the neck of the crown. Thiscurious pathological condition, the cause of which is not exactlyknown, is in its usual site partly above and partly beneath gum. 8. Upper bicuspid: eccentric distortion of fang. This shape isthe result of pressure of neighbouring teeth in process of develop-ment. Absorption going on in centre of single fang is indicatedby the darker area; that is, the thin plate of tooth substance hasoffered little resistance to the rays. 9. Upper central incisor : half the fang absorbed ; small carious MEDICAL AND SURGICAL APPLICATIONS 177 cavity. This tooth is extremely opaque, shown by its relativewhite look and absence of dental canal tracing, a conditionprobably due to its necrosis. 10. Lower molar, with large amalgam stopping reaching nearlyto apex of fang; that is to say, the filling is nearly all beneaththe level of the gum. The metal shown by dense white this absolute density to the Eontgen rays with that ofthe preceding Fig. 90.—Skiagram of Teeth, showing Various Pathological Conditions. 11. Permanent upper molar: fangs absorbed by pressure ofwisdom tooth, which was impacted between them. 12. Wisdom tooth : fangs sharply hooked. 13. Lower molar, showing convergent fangs and carious crown,rendering extraction difficult. Mr. Frank Harrison published some of the earlier radiogramsof teeth in situ. In the Journal of the British Dental Associationfor September, 1896, he has an excellent photograph of a portion 15—2 178 THE RONTGEN RAYS IN MEDICAL WORK of the lower maxilla of a girl of seven. The milk-teeth withtheir pulp-cavities and fangs are clearly visible, while below theroots of the first and second temporary molars are the permanentfirst and second bicuspids enclosed in their respective bony internal dental structures of the lower jaw were displayedwell-nigh as distinctly as would have been done in a dissectedspecimen. Mr. Harrison observes : The
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