. Elementary and dental radiography . wung in on a post collar crown on the lateraland an inlay in the central incisor. The central docs not show clearly,—but clearly enough to show that there is no abscess cavity at its 185). The same as Fig. ]SS two weeks after curettement of the pus sinus. There is some deposition of new bone. 20. In €a$c$ of Alveolar nb$ct$$ to Determine Ulbicb Cooth is Responsible for tbe Jibscess. Case: A pus sinus opening on the labial between Tifl. IS7. the lower central incisors near their apices. All of the lower anterior teeth sound and apparently 186 DENT
. Elementary and dental radiography . wung in on a post collar crown on the lateraland an inlay in the central incisor. The central docs not show clearly,—but clearly enough to show that there is no abscess cavity at its 185). The same as Fig. ]SS two weeks after curettement of the pus sinus. There is some deposition of new bone. 20. In €a$c$ of Alveolar nb$ct$$ to Determine Ulbicb Cooth is Responsible for tbe Jibscess. Case: A pus sinus opening on the labial between Tifl. IS7. the lower central incisors near their apices. All of the lower anterior teeth sound and apparently 186 DENTAL RADIOGRAPHY healthy. Fig. 187 shows which tooth is responsible for the tooth was treated and the abscess cured. The light area to whichthe arrow points, about the apex of the central, represents the abscesscavity. Acute abscesses cannot always be shown in radiographs, becausethere may not be sufficient destruction of bony tissue. Chronic abscesses,which have become acute, can, of course, be shown Fig. 190. Abscess at apex of lower second bicuspid. The tooth carries a gold shell crown. Canal is not filled. The inferior dental canal can be seen plainly in this radiograph— light streak between two dark lines along the lower border of the mandible. Case: A bridge from an upper lateral I$$ and 1$^. with a post collar crown to a central with an inlayabutment, restoring a lost central .incisor: a sinuspointing directly above the dummy central. The lateral had been treatedfor an abscess two years previously. The abscess had yielded to the treat-ment, the canals were filled, and the bridge set. At the time when theinlay was placed in the central it was vital. A radiograph (Fig. 188) wasmade to determine whether the existing sinus was due to a recurrence ofthe abscess of the lateral or death of the pulp and abscess of the radiograph shows that the lateral is responsible. As the canal isfairly well filled (it falls short o
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