. Elementary and dental radiography . Fig. 214 Fig. 215 Fig. 214. Before apicoectomy. Notice the considerable canal filling forced through the apical foramen. (Radiograph by Blum, of New York City.)Fig. 215. Same case as Fig. 214. After apicoectomy. (Radiograph by Ilium, of New York City.) I entertained the belief thai both fistulous openings led to an abscess atthe apex of the bicuspid, but 1 could not verify this belief by probing. Aradiograph (Fig. 211) shows the canals unfilled, and an abscess at theapex of the bicuspid. It shows also that there is no abscess at the apexof the molar roots.

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. Elementary and dental radiography . Fig. 214 Fig. 215 Fig. 214. Before apicoectomy. Notice the considerable canal filling forced through the apical foramen. (Radiograph by Blum, of New York City.)Fig. 215. Same case as Fig. 214. After apicoectomy. (Radiograph by Ilium, of New York City.) I entertained the belief thai both fistulous openings led to an abscess atthe apex of the bicuspid, but 1 could not verify this belief by probing. Aradiograph (Fig. 211) shows the canals unfilled, and an abscess at theapex of the bicuspid. It shows also that there is no abscess at the apexof the molar roots. But it does not show a fistula leading from the bi-cuspid to the molar. The shell-crown on the bicuspid was removed andphenolsulphonic acid pumped through the tooth and out of the fistulaover the bicuspid, but the acid could not be forced through the bicuspidand out at the opening over the molar. The tooth and both fistulousopenings were injected with bismuth paste and a radiograph made. ( I was then able to see that, as I

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