. Elementary and dental radiography / by Howard Riley Raper . iograph to guide him in his work hecould not possibly have performed the operation as quickly, thoroughly,and intelligently as he did, for he would not have known just where, andjust how big, the sequestrum was. A case of phosphor 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 and Tifl. 270. superior maxillary bone, caused by the retention of a piece of tooth root above the dummies of a bridge. 234 DENTA
. Elementary and dental radiography / by Howard Riley Raper . iograph to guide him in his work hecould not possibly have performed the operation as quickly, thoroughly,and intelligently as he did, for he would not have known just where, andjust how big, the sequestrum was. A case of phosphor 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 and Tifl. 270. superior maxillary bone, caused by the retention of a piece of tooth root above the dummies of a bridge. 234 DENTAL RADIOGRAPHY 47. Co Diagnose Antral empyema. This radiograph was made from a dry skull. ItTifl. 271. 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 toTifl. 272. make a radiograph of both antra, that they may be compared. In Fig. 272 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 werepus 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 shado
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