. The American journal of roentgenology, radium therapy and nuclear medicine . roentgenogram of the upper molar area ex-ceedingly difficult at times; namely, theshadow of the zygomatic arch and the lowermargin of the maxillary sinus is often pro-jected over the molar roots, a situation whichoccurs with annoying perversity precisely inthose cases where a clear image of thoseroots is very important. Figures i and 2 il-lustrate this. Various measures have been suggested toovercome this difficulty, all of which may beclassified under one group—the deliberate *Reprinted from the Journal of the Nati
. The American journal of roentgenology, radium therapy and nuclear medicine . roentgenogram of the upper molar area ex-ceedingly difficult at times; namely, theshadow of the zygomatic arch and the lowermargin of the maxillary sinus is often pro-jected over the molar roots, a situation whichoccurs with annoying perversity precisely inthose cases where a clear image of thoseroots is very important. Figures i and 2 il-lustrate this. Various measures have been suggested toovercome this difficulty, all of which may beclassified under one group—the deliberate *Reprinted from the Journal of the National*0n account of the importance of this producing of distortion, in such a manner asto throw the suspected area clear from theseshadows. This, to be sure, will often furnisha roentgenogram of sufficient value, but un-nately the relation of the various structuresof the tooth appears at times distorted to aconfusing extent. Rather than do this, aroentgenogram is very frequently taken innormal position and just as frequentlysome important diagnostic features In trying to find a method which will ob-viate this difficulty, I have come to the con-clusion that it will have to be attempted, notby modifying the angle of incident of the Dental Association, April, 1921, viii, it is published in its entirety. 66o X-Ray Report roentgen rays, but by modifying the angle ofthe film to the tooth. Figures 3 and 4 illus-trate the result of this procedure probablymore easily than a lengthy explanationwould. To sum up briefly: By placing thefilm into position approximately parallel tothe long axis of the tooth to be examined, itwill be possible to direct the roentgen raysbelow the zygomatic arch and antrum (max-illary sinus), entirely eliminating their over-lapping shadows. In practice this is done by attaching a me- dium-sized absorbent cotton roll to the loweredge of the film, and the patient is instructedto place his finger near the upper edge of thefilm, pres
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