. Elementary and dental radiography / by Howard Riley Raper . h the arrow points is a bone whorl. (Radiograph by Pancoast, of Philadelphia.) According to this definition all chronic alveolar abscesses are cysts—bone cysts, because they occur in bone. But the name cyst is usually notapplied until the abscess sac assumes a great size. The abscess in is large enough to be called a cyst, in the generally used sense of theterm. This radiograph shows a large cyst in the lower Ti8. 252. jaw. The two roots of the lower first molar are doubtless responsible for the cyst formation. In cyst cases
. Elementary and dental radiography / by Howard Riley Raper . h the arrow points is a bone whorl. (Radiograph by Pancoast, of Philadelphia.) According to this definition all chronic alveolar abscesses are cysts—bone cysts, because they occur in bone. But the name cyst is usually notapplied until the abscess sac assumes a great size. The abscess in is large enough to be called a cyst, in the generally used sense of theterm. This radiograph shows a large cyst in the lower Ti8. 252. jaw. The two roots of the lower first molar are doubtless responsible for the cyst formation. In cyst cases there is often considerable and disfiguring enlargement 1 f the bone, and such cases are spoken of as cystic tumors, a tumor, of course, being simply an abnormal enlargement or growth. THE USES OF THE RADIOGRAPH IX DENTISTRY 219 A man, age about thirty-seven, was referred to fjg. 253 the college clinic to have a growth bri the lower jaw cut off. There was no growth to cut off. There ivas a definite enlargement of the bone in the lower first molar region,. Fig. 251. The arrow points to a stone in the submaxillary duct. (Radiograph by Lange, of Cincinnati.) giving the man the appearance of carrying a large lump of tobaccoin the vestibule of the mouth. The patient suffered local pain, and theinvolved area was tender to palpation. The first molar tooth was missingfrom the jaw. A radiograph was made and showed a cyst involving thesecond bicuspid and second molar. (I regret that the radiograph has beenlost.) Neither the second bicuspid nor the second molar had cavities norfillings in them. Considering the evidence of neglect of the mouth andteeth, it was not deemed worth while to try to conserve the teeth. Ac-cordingly the second bicuspid was extracted, which permitted the escapeof considerable watery, brown pus. A doubt then arose as to whetherthe radiograph showed an involvement of the molar or not. Anotherradiograph (Fig. 253) was made. It shows that the molar is wa
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