. Dental and oral radiography; a textbook for students and practitioners of dentistry . endicularly to aplane which lies midway between the plane of the teethdesired and the plane of the film. The result is a radio-gram in which the images of the teeth desired are im-posed upon the film in their correct proportions. It will be noted upon a close examination of this lastradiogram (C) that an abscess is present upon the rootof the right central incisor. By examining the otherradiograms {A and B) it will be seen that this conditionis not apparent in them, which lends emphasis to theimportance of
. Dental and oral radiography; a textbook for students and practitioners of dentistry . endicularly to aplane which lies midway between the plane of the teethdesired and the plane of the film. The result is a radio-gram in which the images of the teeth desired are im-posed upon the film in their correct proportions. It will be noted upon a close examination of this lastradiogram (C) that an abscess is present upon the rootof the right central incisor. By examining the otherradiograms {A and B) it will be seen that this conditionis not apparent in them, which lends emphasis to theimportance of an exact technic. The technic illustrated (by C of Fig. 38) is indicatedfor all of the upper teeth. Occasions may arise, however,where it will not suffice for the upper molar teeth owingto the fact that the buccal roots and the lingual roots may *Technic of Dr Weston Price, ])ENTAL AND OJIAI. JtADJOGKALJl Y TECJIXIC ) diverge to the extent of assuming different planes. Inthis event, it may be necessary to make more than oneradiogram, if information of an exacting character is de-. Fig. 39.—Technic for the upper molar teeth. sired concerning an upper molar. The plan of procedureis shown in Fig. 39, A, B, and a general picture of the molar is desired (shown by 8b DENTAL AND ORAL RADIOGRAPHY A), the plane of the tooth is assumed as lying midwaybetween buccal roots and lingual root, and the rays arepassed in perpendicularly to the plane lying midway be-tween this assumed plane and the film. In the resultingradiogram none of the roots will appear in their exactproportions, but the buccal roots will be slightly short-ened, while the lingual root will be slightly lengthened. When it is desirable to obtain a radiogram of the buc-cal roots in their exact length, they must be assumed asbeing the plane of the tooth (B) and the rays must passin perpendicularly to a plane lying midway between them
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradiogr, bookyear1919
