. Interpretation of dental and maxillary roentgenograms . ng depending on whether the pa-tients nose is pressed down on the plate or slighth Fig. 12.—Plate of left side of face, showing normal anatomic landmarks and im-pacted upper third molar. (See Fig. 13.) raised from it. In the same way the position of the headaffects the overlapping of the molar region by theshadows of the vertebrae at the posterior portion of theplate. The dark space above the npper teeth is formedby the maxillary sinus and the nasal fossa. Into thisspace occasionally may be seen projecting the coronoidprocess of the opp
. Interpretation of dental and maxillary roentgenograms . ng depending on whether the pa-tients nose is pressed down on the plate or slighth Fig. 12.—Plate of left side of face, showing normal anatomic landmarks and im-pacted upper third molar. (See Fig. 13.) raised from it. In the same way the position of the headaffects the overlapping of the molar region by theshadows of the vertebrae at the posterior portion of theplate. The dark space above the npper teeth is formedby the maxillary sinus and the nasal fossa. Into thisspace occasionally may be seen projecting the coronoidprocess of the opposite side of the ,]*aw„ Above themaxillary sinus and nasal fossa, the honeycombed ap-pearance is due to the ethmoid cells. Below the roots of ANATOMY OF THE TEETH AXD JAWS 35 the loAver molar teeth maj^ be seen the mandibular canal,running forward to the mental foramen lietween and be-low the apices of the premolars. Below the lower borderof the mandible, extending in front of the vertebrae asfar forward sometimes as the first molar, the hyoid bone. Fig. 13.—Diagrammatic illustration of Fig. 12. a, portion of upper and lower-jaws overlapped by shadow cf opposite side; b, vertebrre; c, maxillary sinus and nasaifossm; d, coronoid process of right side of mandible; e, mandibular canal; /, mentalforamen; g, hyoid bone. is sho^^m. In plates taken to show the molar region, theramus and cond^doid process of the mandilile can fre-quently be traced up to the joint. CHAPTER III PATHOLOGY IN RELATION TO DENTALROENTGENOLOGY One of the essentials of correct interpretation of roent-genograms of the teeth and their supporting tissues is afamiliarity with the clinical course, pathology, and resultof acute and particularly chronic inflammation involvingthese parts. The diagnostic value of the roentgen ray iuinflammatory processes affecting the teeth and surround-ing parts depends entirely upon variations in the densityof the hard tissues as a result of the inflammation. In anacute locali
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