. A system of instruction in X-ray methods and medical uses of light, hot-air, vibration and high-frequency currents : a pictorial system of teaching by clinical instruction plates with explanatory text : a series of photographic clinics in standard uses of scientific therapeutic apparatus for surgical and medical practitioners : prepared especially for the post-graduate home study of surgeons, general physicians, dentists, dermatologists and specialists in the treatment of chronic diseases, and sanitarium practice . ed to a compai*atively small portion of the body,are of rather wide range and


. A system of instruction in X-ray methods and medical uses of light, hot-air, vibration and high-frequency currents : a pictorial system of teaching by clinical instruction plates with explanatory text : a series of photographic clinics in standard uses of scientific therapeutic apparatus for surgical and medical practitioners : prepared especially for the post-graduate home study of surgeons, general physicians, dentists, dermatologists and specialists in the treatment of chronic diseases, and sanitarium practice . ed to a compai*atively small portion of the body,are of rather wide range and will require as much skill on the partof the operator as work upon thicker tissues. For instance, the den-tist must be able to so manipulate his tube and technique as to differ-entiate between the roots of the tooth and the bone which surroundsthem, a task equal to any which confronts the physician. This isdifficult, because as the root grows smaller toward its apex the boneproportionately thickens about the socket. Or, on the other hand,the dentist may have before him simply the location of a brokenbroach or a pus-cavity, tasks which are comparatively easy. The most frequent uses for the X-ray in dentistry, as broughtout by Kells, Rollins, Price, and Clapp, are for locating uneruptcd DENTAL SKIAGRAPH byDr, C. Edmund Kells^ Jr. No. Ddz. m Age Examined for SMake of Plate. Time instance Deueloper Tube Remarks Plate 137.—Plate S of the text, showing form of envelope for tiling and recording denta] DENTAL SKIAGRAPH.


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