. Elementary and dental radiography . so well do tissues tolerategutta-percha. But the fact remains: The ideal canal filling is one zvhichfills the canals, neither falling short of the end of the root nor passingbeyond it. 12. to Ccarn if €anal$ Hre Open and enlarged to tbc JFipex Before Tilling, and toObserve tbe Canal Tilling JIfter the Operation. Shows a lower first molar at the end of the first fic|. I7K sitting, after the extirpation of the pulp. The wire (the dark streak) in the distal canal reaches almost THE USES Of THE RADIOGRAril IX DEXITSTRY 177 to the apex of the root. The two wire
. Elementary and dental radiography . so well do tissues tolerategutta-percha. But the fact remains: The ideal canal filling is one zvhichfills the canals, neither falling short of the end of the root nor passingbeyond it. 12. to Ccarn if €anal$ Hre Open and enlarged to tbc JFipex Before Tilling, and toObserve tbe Canal Tilling JIfter the Operation. Shows a lower first molar at the end of the first fic|. I7K sitting, after the extirpation of the pulp. The wire (the dark streak) in the distal canal reaches almost THE USES Of THE RADIOGRAril IX DEXITSTRY 177 to the apex of the root. The two wires in the mesial canals penetrate onlyabout one-half the distance to the apex. These wires pass into the canalsas far as they (the canals) are enlarged. Wires are placed in the canalsto learn to what depth the latter are enlarged, because the wire shows somuch better in the radiograph than the open canal. In fact, the wire canbe seen very clearly as a dark streak when the canal itself as a light streakcannot be radiographed at Fig. 174. Wire passing to the distal through a perforation in tlie upper first molar. (Radio-graph by Blum of New York City.) Sufficient enlargement of the canals requiredTI9. 172. several sittings. The technic for enlarging the canals consisted of pumping sulphuric acid into them, neu-tralizing it, then reaming them out with thuiub, spiral broaches. Sul-phuric acid was sealed in the mesial canals at the end of the first andsecond sittings. Fig. 172 shows the wires well to the apex in all threecanals. This radiograph shows the tooth after 173. Even after the canals arc enlarged we sometimes fail to reach the a]K\\ with the gutta-percha filling. Forthis reason it has become my custom lately to fill only a part of the canal,then make a radiograph to see that the filling reaches the apex beforefinishing the operation. Dr. M. L. Rhein, of New York City, was, as faras 1 am able to learn, the lirst man to make a practice of using the radio-
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