. Elementary and dental radiography / by Howard Riley Raper . Fig. 173. Canals in an upper first molar well filled. (Operator, Dr. Emmert, Indianapolis.) Fig. 174. Wire passing to the mesial through a perforation in the mesial side of the mesio-buccal root of an upper first molar. Even after the canals are open to the end, the fact having beendemonstrated with diagnostic wires and radiographs, it is not at all un-common for the operator to fail to fill the canals the first time he tries. Dr. M. L. Rhein, of New York City, was, as far as I am able tolearn, the first man to make routine use of t
. Elementary and dental radiography / by Howard Riley Raper . Fig. 173. Canals in an upper first molar well filled. (Operator, Dr. Emmert, Indianapolis.) Fig. 174. Wire passing to the mesial through a perforation in the mesial side of the mesio-buccal root of an upper first molar. Even after the canals are open to the end, the fact having beendemonstrated with diagnostic wires and radiographs, it is not at all un-common for the operator to fail to fill the canals the first time he tries. Dr. M. L. Rhein, of New York City, was, as far as I am able tolearn, the first man to make routine use of the radiograph in pulp canalwork. The advantages in using the radiograph in this connection are as fol-lows : Much guesswork is eliminated—we know what we are the canal is tortuous, and we start through the side of the root, theradiograph shows us the mistake, keeps us from making a perforation,and, in many cases, enables us to follow the canal to the true apex. Itthe root is unusually short the radiograph keeps us from going throughthe apex, and
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