. Elementary and dental radiography / by Howard Riley Raper . 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 tor
. Elementary and dental radiography / by Howard Riley Raper . 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 if it is unusually long it keeps us from making the error ofnot penetrating the canal far enough. The radiograph shows patientsjust what is being done for them. 178 DENTAL RADIOGRAPHY. Fig. 175. The arrow points to a pulp stone in the pulp chamber of an upper second molar. The blacks and whites in this half-tone ars as they appear in the negative, the pulp stone a light area more or less surrounded by dark.
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