. Elementary and dental radiography / by Howard Riley Raper . b-scess Cavity. Figure 394 shows the anterior palatine foramen. Depending on the Rli. [DING R. IDJUCR. WHS 3*< angle of the rays and the position of the film, this foramen, which is inthe region of the apices, and between the roots, of the upper centralincisors, may have the radiographic appearance of an abscess cavity at theapex of one of the central incisors. 3. To Mistake the Nasal Cavity for Necrosis of the 395 shows nasal cavity spots which have been mistaken for abscesses of the upper anterior teeth and necros
. Elementary and dental radiography / by Howard Riley Raper . b-scess Cavity. Figure 394 shows the anterior palatine foramen. Depending on the Rli. [DING R. IDJUCR. WHS 3*< angle of the rays and the position of the film, this foramen, which is inthe region of the apices, and between the roots, of the upper centralincisors, may have the radiographic appearance of an abscess cavity at theapex of one of the central incisors. 3. To Mistake the Nasal Cavity for Necrosis of the 395 shows nasal cavity spots which have been mistaken for abscesses of the upper anterior teeth and necrosis of the palate. 4. To Mistake the Maxillary Sinus for an Abscess Cavity atthe Apices of the Upper Bicuspids and Molars. Figure 396 illustrates the appearance of the antrum which is some-times mistaken for a large abscess cavity. It is sometimes difficult, to thepoint of being impossible, to differentiate between the antrum and anabscess cavity by the study of radiographs alone; use the electric test forpulp vitality. See diagram Fig. 397. (See Fig. 459A.). Fig. 307. Diagram showing why the shadow of the antrum occurs at the apices of the roots of the upper posterior teeth. 5. To Mistake the Inferior Dental Canal for a FistulousTract. Figure 398 shows the inferior dental canal leading forward from theunerupted third molar. This canal was mistaken for a fistulous tract. 6. To Mistake the Mandibular Foramen for to Disease. At the mandibular foramen the ramus is thin and so this area mayappear dark in the radiographic negative. 366 APPENDIX j. To Fail to Bear in Mind That There is Such a Thing as aNormal Periapical Space. It should constantly be borne in mind that there is such a thing as anormal periapical space and that this space may be much larger in somecases than in others. A large periapical space has about the same appear-ance as a small abscess cavity. To differentiate between a small abscesscavity and a large periapical space learn whether or not the p
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