. Elementary and dental radiography / by Howard Riley Raper . esence of a holein the external alveolar plate near the region of bifurcation should notbe lost sight of. The opening occurs in this region following the path of READIXC RADIOGR. IPHS 375 least resistance, the path directly buccally or buccally and downwardbeing through the very dense bone -of the external oblique ridge. Ab-scesses at the apices of the lower molars often show the dark area repre-senting the abscess indistinctly, the negative having a light haze thrownover it due to the density of the oblique- ridges. Thus care must
. Elementary and dental radiography / by Howard Riley Raper . esence of a holein the external alveolar plate near the region of bifurcation should notbe lost sight of. The opening occurs in this region following the path of READIXC RADIOGR. IPHS 375 least resistance, the path directly buccally or buccally and downwardbeing through the very dense bone -of the external oblique ridge. Ab-scesses at the apices of the lower molars often show the dark area repre-senting the abscess indistinctly, the negative having a light haze thrownover it due to the density of the oblique- ridges. Thus care must be exer-cised or absce>s areas at the apices of the lower molars—particularly thesecond and third, will be overlooked. Figure 419 shows what might easily be mistaken for a post passingthrough the side of the root. Notice, however, there is no bone destruc-tion about the post which seems to penetrate the osseous tissue. Whatseems to be a post penetrating the osseous tissue is a bar for a Gilmoreattachment, for a partial plate, resting on the gum Fig. 41OA. Radioeraphs of an extracted crowned tooth, made by directing the X-raysthrough the tooth from different angles. (By R. Ottolengui.) Figure 419A shows three radiographs of a:i extracted, crownedupper cuspid, with the post of the crown passing through a perforationon the labial. The radiographs were made at different angles. Xumberone seems to show the post following the canal; number two seems toshow the post passing through the distal side of the root, while numberthree shows the post passing through the labial side of the root. Number one was made by directing the X-rays straight through thetooth from labial to lingual (X-rays Xo. 2, Fig. 419B). Xumber threewas made straight through from mesial to distal and number two wasmade with the rays passing through the tooth in a disto-lingual direction(Fig. 419B, X-rays No. 3). 37^ APPENDIX Figure 419C is a case from practice. Both centrals are two radiog
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