. Dental electro-therapeutics. ay also be taken with a large film or plate THE X-RAYS OR RONTGEN RAYS 205 in the mouth held between the teeth, the rays being directedfrom above, but the presence of the bicuspids and molarsis likely to preclude a clear image of the parts in the upper jaw, however, be edentulous, or at anyrate as far as molars and bicuspids are concerned, theradiograph taken in this manner and showing at least apart of the antrum of each side, may be a very valuablehelp to diagnosis. The presence of roots, dentigerouscysts, or even foreign bodies in the antrum ma
. Dental electro-therapeutics. ay also be taken with a large film or plate THE X-RAYS OR RONTGEN RAYS 205 in the mouth held between the teeth, the rays being directedfrom above, but the presence of the bicuspids and molarsis likely to preclude a clear image of the parts in the upper jaw, however, be edentulous, or at anyrate as far as molars and bicuspids are concerned, theradiograph taken in this manner and showing at least apart of the antrum of each side, may be a very valuablehelp to diagnosis. The presence of roots, dentigerouscysts, or even foreign bodies in the antrum may of coursebe easily .demonstrated in this way. Dieck reports a casein wdiich a bicuspid root was forced up into the antrumduring an extraction. In this connection it will be well tobear in mind the possibility of misinterpretation referred tobefore, which may be brought about by the inclusion ofthe root-ends on the film within the image of the antrum,while the root itself may occupy its normal position in themaxilla. Fig. 126. XIII. The subject of facial neuralgia is one that extendsinto so many different territories that its thorough con-sideration is of course out of the question here. Sufficeit to say that its origin is often of so obscure a nature,while the trouble itself may become a source of intenseagony to the patient, that no possible aid to its diagnosisshould be neglected, and an x-ray may reveal conditions(chiefly of impacted teeth) the removal of which mayrestore health and comfort to the sufferer. Fig. 126 showsan impacted left lower second bicuspid pressing againstthe first molar root and causing absorption and all the 206 ELECTRO-PHYSICS symptoms of severe neuralgia. The patient has experiencedno more trouble since the extraction of the molar. Upson,among others, strongly urges the radiographic examinationof the jaws and teeth of all patients suffering from mentaldisorders, even if no direct indication of their dental originis Exostosis of roots is a
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