. Elementary and dental radiography . necrosis of the lower jawTig. 269. several years after removal of the sequestrum. The jaw is in two parts, with the ends overlapping. A carious condition of the alveolar process andfig. 270. superior maxillary bone, caused by the retention of a piece of tooth root above the dummies of a and stinudation with drugs might, or might not, be necessaryin this case, but it is probable that the carious bone will regain normalhealth and vitality upon removal of the direct cause of the caries—the bitof tooth root. 234 DENTAL RADIOGRAPHY 47. to DUd
. Elementary and dental radiography . necrosis of the lower jawTig. 269. several years after removal of the sequestrum. The jaw is in two parts, with the ends overlapping. A carious condition of the alveolar process andfig. 270. superior maxillary bone, caused by the retention of a piece of tooth root above the dummies of a and stinudation with drugs might, or might not, be necessaryin this case, but it is probable that the carious bone will regain normalhealth and vitality upon removal of the direct cause of the caries—the bitof tooth root. 234 DENTAL RADIOGRAPHY 47. to DUdnose Hntral empyema. This radiograph was made from a dry skull. ItTig. 27K shows the following: The frontal sinuses AA, the orbits BB, ethmoid cells CC, the nasal cavity DD,and the maxillary sinuses EF. The sinus E is filled with lead shot, thesinus F has a molar tooth in it. The picture is printed to give one anopportunity to study the landmarks of such a radiograph, and so enableone to interpret the coming pictures more Fig. 270. Carious condition of the alveolar process and bone, caused by a piece of toothroot above the dummies of a bridge. (Radiograph by Lewis.) To observe pus in the antrum it is necessary toTig. 272, make a radiograph of both antra, that they may be compared. In Fig. 2^2 the antrum A is filled withpus, the antrum B is healthy. It must be borne in mind that the radio-graph alone does not demonstrate to us the presence of pus in the shows us only that there is something in the antrum. The appearanceof the radiograph would be about the same, whether that something wxrepus or a soft, tumorous growth. Such a radiograph as Fig. 272 will showwhether the disease is confined to the antrum or involves the ethmoidalcells and frontal sinuses. In this case the disease exists only in the antrum. Cloudiness of the antrum A indicates a patho- TiflS. 273 and 274. logical condition. In Fig. 273 the arrows point to a dark shadow, which is an impacted up
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