. Elementary and dental radiography . l. In this case the radiograph savedconsiderable work and worry on the part of the operator. I have knownsecond and third molars to have only one canal, but this is the only caseI have ever encountered in which a first molar had but one canal. This case was in the hands of one of the most Tig. 167. expert operators in Indianapolis. The lower first bicuspid had been devitalized, and the pulp removed, 174 DENTAL RADIOGRAPHY but the tooth remained sore. Radiography was resorted to to learn, ifpossible, the cause of the persistent pericementitis. A piece of li
. Elementary and dental radiography . l. In this case the radiograph savedconsiderable work and worry on the part of the operator. I have knownsecond and third molars to have only one canal, but this is the only caseI have ever encountered in which a first molar had but one canal. This case was in the hands of one of the most Tig. 167. expert operators in Indianapolis. The lower first bicuspid had been devitalized, and the pulp removed, 174 DENTAL RADIOGRAPHY but the tooth remained sore. Radiography was resorted to to learn, ifpossible, the cause of the persistent pericementitis. A piece of ligaturewire, such as is used by orthodontists, was placed in the canal and radio-graph Fig. 167 made. The wire follows the enlarged canal. But thisparticular tooth happens to have two canals. The unopened canal is seento the distal of the wire. If a man, having the skill of the operator whohandled this case, misses a canal, as this man did, then I firmly believethat the mistake is one that anv man, however skillful, is liable to
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