. Dental electro-therapeutics. bably not be detected as such if the rays are THE USES OF THE X-RAYS IN DENTISTRY 189 directed from the front, whereas, if striking the tooth morelaterally it may easily become visible. A stereoradiograph isoften of value in such cases. The fact that a radiograph is a composite shadow pictureof the various layers penetrated by the rays, should never belost sight of and unless the protruding portion of the instru-ment or pivot is seen outside of the margin of the root, themost aggravated case of perforation might appear merely asa comparatively harmless piece of m
. Dental electro-therapeutics. bably not be detected as such if the rays are THE USES OF THE X-RAYS IN DENTISTRY 189 directed from the front, whereas, if striking the tooth morelaterally it may easily become visible. A stereoradiograph isoften of value in such cases. The fact that a radiograph is a composite shadow pictureof the various layers penetrated by the rays, should never belost sight of and unless the protruding portion of the instru-ment or pivot is seen outside of the margin of the root, themost aggravated case of perforation might appear merely asa comparatively harmless piece of metal lying within the course the presence of a fragment of a broach is never anagreeable discovery in a root canal, but when both radio-graphic and clinical examination show it to be well insideof the roots, the probabilities are in favor of its doing nogreat harm if entirely incorporated in the canal filling. Inupper first bicuspids a perforation between the roots isusually not easy to detect by means of the .
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