. Elementary and dental radiography . adiograph by Pancoast, of Philadelphia.) Fig. 165 is also a case of Dr. Oyers. The fig. its. radiograph shows an impacted upper third molar, with the occlusal surface presenting upwards. Dr. Oyers remarks concerning this case are interesting. I quote Dr. Cryer: [65 shows the occluding surface of the upper third molar pointing upward towards the posterior portion of the orbit. The patient had been suffering from disturbance of the eye for a long time. Considerable improvement took place in the eye soon after extraction of the inverted tooth. 10. Co Determin
. Elementary and dental radiography . adiograph by Pancoast, of Philadelphia.) Fig. 165 is also a case of Dr. Oyers. The fig. its. radiograph shows an impacted upper third molar, with the occlusal surface presenting upwards. Dr. Oyers remarks concerning this case are interesting. I quote Dr. Cryer: [65 shows the occluding surface of the upper third molar pointing upward towards the posterior portion of the orbit. The patient had been suffering from disturbance of the eye for a long time. Considerable improvement took place in the eye soon after extraction of the inverted tooth. 10. Co Determine the number of Canals in Some will be noticed thai I say to determine the number of canals intome teeth. Of course, it i> not necessary to use the radiograph each THE USES OF THE RADIOGRAPH IN DENTISTRY 173 time we open into a tooth to learn how many canals that tooth may occasionally I do find it necessary or expedient to use the radiographto verify or disprove the existence of some unusual condition Fig. i«; Impacted upper third molar with the occlusal surface pointing upward. (Radiographby Pancoast, of Philadelphia.) Case: An upper first molar in which but oneTifl. 166. small canal could be found. After searching for the other two canals for a few minutes, the one canalwas filled with gutta-percha, and a radiograph made (Fig. 166) ; thisshows that the tooth had but one canal. 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
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