. Les rayons de Roentgen en médecine et en chirurgie comme aide au diagnostic et comme agent thérapeutique : conçu pour l'usage des praticiens et des étudiants . Fig. 382, 383. Patient du Dr Clapp. Instrument cassé dans la mâchoire. L'instrument a été forcé à travers le centre, et est resté dans la mâchoire un an, causant un abcès sérieux. Ces deux coupes montrent la grande haibilité à l'erreur dans le diagnostic à partir des images radiographiques à moins que deux vues ne soient prises. Une des coupes représente l'instrument comme dépassant de l'apex du centre; l'autre, thatit se trouve entre.le centre et latéral. Ce dernier était la véritable positio

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. The Roentgen rays in medicine and surgery as an aid in diagnosis and as a therapeutic agent : designed for the use of practitioners and students . Figs. 382, 383. Patient of Dr. Clapp. Broken instrument in the jaw. The instrument wasforced through the central, and remained in the jaw a year, causing serious abscess. These two cutsshow the great hability to error in diagnosis from X-ray pictures unless two views are taken. Oneof the cuts represents the instrument as protruding from the apex of the central; the other, thatit lies between.the central and lateral. The latter was the true position.. 5. Extent of Alveolar Absorption. — The X-rays are not necessary toshow the presence of alveolar absorption, which is sadly evident andimpossible of cure, but it is of interest to know the extent of the loss.Dr. Rollins has shown by means of the X-rays an absorption of the edgeof the alveoli in mouths where there was no out-ward sign of the disease. 6. Fractured Roots.—(See Fig. 384.) It hasbeen impossible by the older methods to make adiagnosis of a fracture of the upper end of a root, and therefore impossible to learn whether or notsuch fractures would heal. It has been customaryto believe that dentine had no power of repair.Dr. Clapp, however, has observed by the X-raysa fracture which did not show in subsequent nega-tives, and although he does not consider suchevidence conclusive, it is nevertheless interesting. 7. Root Canal filled or not. — It is often desirable to know, withoutremoving a filling, whether or not a root canal has been filled, and thisinformation can be furni

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