. Elementary and dental radiography / by Howard Riley Raper . 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 Tha
. Elementary and dental radiography / by Howard Riley Raper . 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 pulp of the. Fig. 39S. The inferior dental canal leading forward from the apical region of the lower thirdmolar. It was mistaken for a fistulous tract. tooth is vital by the electric test or by making an exploratory opening. Inthis connection I may say that infection may cause hypercementosis andabnormal osteodensity, , osteosclerosis, in the region of the infection,which knowledge will assist in differentiating between small abscess cavi-ties and normal, large periapical spaces. Figure 399 illustrates an un-usually large periapical space at the roots of a lower molar while illustrates a small abscess cavity no larger than a large periapical spaceat the apices of the lower third molar. The filling material seen to enterthe pulp chamber admits of a differential diagnosis in this latter case.(See Fig. 444, which is the same as Fig. 400 but shows the filling in thepulp chamber much better.) 8. To Mistake a Dark Spot, Due to Somewhat UnusualPorosity, for an Alveolar Abscess. Figu
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