. Elementary and dental radiography / by Howard Riley Raper . Fig. 256. Bone cyst of the lower jaw. 43. Tn Gases of Dentigerous Cyst. Any cyst containing a tooth body, or tooth bodies, is said to be adentigerous cyst. Dentigerous cyst of the jaws are not uncommon. Theirdefinite diagnosis is possible only when the radiograph is used. Because the apex of the tooth extends into the pus sac a chronicdento-alveolar abscess is sometimes called a dentigerous cyst. But thisuse of the term is considered improper. Case in the practice of Dr. M. H. Cryer. I quote Tig. 257. Dr. Cryer: The patient, a child
. Elementary and dental radiography / by Howard Riley Raper . Fig. 256. Bone cyst of the lower jaw. 43. Tn Gases of Dentigerous Cyst. Any cyst containing a tooth body, or tooth bodies, is said to be adentigerous cyst. Dentigerous cyst of the jaws are not uncommon. Theirdefinite diagnosis is possible only when the radiograph is used. Because the apex of the tooth extends into the pus sac a chronicdento-alveolar abscess is sometimes called a dentigerous cyst. But thisuse of the term is considered improper. Case in the practice of Dr. M. H. Cryer. I quote Tig. 257. Dr. Cryer: The patient, a child of nine, had a swelling of the left side of jaw for about two years. This gradually increased to the size of a hens egg, causing considerable deformity. A radiograph of the case (Fig. 257) shows a retained de- THE USES OE THE RADIOGRAPH IN DENTISTRY 223. Fig. 257. Dentigerous cyst of tlie lower jaw in child nine year? old. The arrow points to thetooth in the cyst. The light area represents the cyst. (Radiograph by Pancoast, of Phiadelphia.) ciduous second molar tooth at the lower border of the jaw and surroundedby an ovoid clear area. A diagnosis of dentigerous cyst was made. At operation through the mouth the shell of bone was found to con-tain, not the usual fluid, but a resilient mass of pinkish-white tissue sur-rounded by a sac of darker color. The contents, including the soft tissues,the tooth shown in the picture and the sac. were removed and the cavitylightly packed with gauze. The patient is making an uneventful recover} further diagnosis of the case will depend on microscopic examinationof the tissue. Fig. 258 was made for a patient of Dr. J. 25$ and 259. Lane, of Philadelphia. Age of patient, eight. Theradiograph shows an unerupted second bicuspid sur-rounded by a light area representing a dentigerous cyst. The
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