. Elementary and dental radiography . Fig. 272. A, antrum with pus in it. B, healthy ) (Radiograph by Carman, of St. are very misleading and confusing, as witnessed in Fig. 275, which wasmade on a film held in the mouth, and is of the antrum filled with leadshot—illustrated in Fig. 271. The dots outline a very large antrum. An open-Tifl. 276. ing made at the favorite site for opening into the antrum through the mouth, above their apices, be-tween the second bicuspid and first molar (the first molar has been ex-tracted), would not puncture this antrum at its lowest point. The rooto
. Elementary and dental radiography . Fig. 272. A, antrum with pus in it. B, healthy ) (Radiograph by Carman, of St. are very misleading and confusing, as witnessed in Fig. 275, which wasmade on a film held in the mouth, and is of the antrum filled with leadshot—illustrated in Fig. 271. The dots outline a very large antrum. An open-Tifl. 276. ing made at the favorite site for opening into the antrum through the mouth, above their apices, be-tween the second bicuspid and first molar (the first molar has been ex-tracted), would not puncture this antrum at its lowest point. The rootof the second molar seems to penetrate the antrum. Whether it actuallypenetrates the floor of the antrum or not I cannot say definitely, because TIIR USJiS or Tim RADIOGRAPII I\ nilXTISTRY 27,y. Fig. 273. A, diseased antiuni. The shadow iiuinted to by the arrows is an inijiacted thirdmolar. B, healthy antrum, CC, turbinate bones, EE, very small frontal sinuses. (Radiograph by Pfahler of Philadelphia.) of the lack of perspective in the radiograph. I am incHned to think, how-ever, that it does not—the lower part of the antrum and the end of theroot overlap, the tooth root passing to the lingual of the antrum. Because of its unusual size the lower part of the antrum was thoughtto contain a malignant growth*. Dr. Cryer rejected this interpretation,saying that the antrum must have been of the size shown in the radio-graph before the formation of the second and third molars, and that thelarge antrum was responsible for the pinched-together condition of their 238 DENTAL RADIOGRAPHY
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