Image from page 34 of "Oral Roentgenology : a Roentgen study of the anatomy and pathology of the oral cavity" (1917)
Authors: Thoma, Kurt H. (Kurt Hermann), 1883-
Publisher: Boston, Mass. : Ritter & Company
Contributing Library: West Virginia University Libraries
Digitizing Sponsor: LYRASIS Members and Sloan Foundation
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on, the diameter is aboutequal to one-half of the crown, the root-canal being widest at the apicalpart, where it presents a funnel-shaped opening (see Figure 30). Afterthe apical part is completely formed there is still a good-sized root canal 28 ORAL ROENTGENOLOGY (see Figure 31), but all through life a gradual reduction in size goes on,due to the deposit of new dentine by the odontoblasts. This process ishastened by certain conditions such as decay and the presence of largemetal fillings, probably as a protective measure. In old age, and some-times earlier, on account of conditions such as those just mentioned, weoften find the canals of minute size and even obliterated entirely (seeFigure 32). Roentgenology of Tooth Development Figure 10. Specimen: Fetus, six months old. Roentgen Examination: Note Meckels cartilage, bone formation of thejaws and small tooth plates indicating the beginning of calcification ofthe temporary teeth. ROEXTGENOGFLiPIIIC STUDY OF THE XORMAL ORAL TISSUES 29
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Figure 10. 30 ORAL ROENTGENOLOGY Roentgenology of Tooth Development Figure ii. Patient: A. H., girl three years old. Roentgen Examination: All the temporary teeth have erupted.The calcification of the permanent cuspid and first molar has reachedabout two-thirds of the crowns. The tip of the first bicuspid is seenbetween the roots of the first temporary molar in the lower jaw. Figure 12. Patient: H. S., girl four years old. Roentgen Examination: Here we find further progress in toothdevelopment. The roots of the first temporary molar have been con-siderably absorbed. Calcification of the cuspid, first bicuspid and firstpermanent molar has further advanced. ROEXTGEXOGRAPIITC STUDY OF THE XORMAL ORAL TLSSUES 31
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