. Interpretation of dental and maxillary roentgenograms . s,being attached by the peridental membrane. The alveolarprocess is composed of spongy or cancellated bone (), which appears in the roentgenogram as a fine inter-lacing network. The sockets of the teeth are lined witha thin plate of dense bone, which is shown in the x-ray -,.00^ .m\ V-- #N IN J *• ^ ■■■■■• , ,«»<-.•■ Fig. 1.—Showing cancellated bone of alveolar process. (Cryer.) negative as a fine white line around the tooth. Betweenthis line and the tooth itself is a narrow dark space rep-resenting the peridental membrane. Thes
. Interpretation of dental and maxillary roentgenograms . s,being attached by the peridental membrane. The alveolarprocess is composed of spongy or cancellated bone (), which appears in the roentgenogram as a fine inter-lacing network. The sockets of the teeth are lined witha thin plate of dense bone, which is shown in the x-ray -,.00^ .m\ V-- #N IN J *• ^ ■■■■■• , ,«»<-.•■ Fig. 1.—Showing cancellated bone of alveolar process. (Cryer.) negative as a fine white line around the tooth. Betweenthis line and the tooth itself is a narrow dark space rep-resenting the peridental membrane. These lines are im-portant landmarks in the interpretation of odontograms,as their absence or deviation vsuaUi/ means some patho-logic condition. (See Fig. 39, p. 79.) 26 INTERPRETATION OF ROENTGENOGRAMS Roentgenographic Anatomic Landmarks in the Upperand Lower Jaws Upper Jaw At a varying distance above tlie apices of the centraland lateral incisor teeth is fonnd the iloor of the nose(Fig. 2), sometimes seen in the odontogram as a dark. Fig. 2.—Anterior view of skull, showing anterior opening of nasal chamber. (Cryer.) shadow which might be mistaken for a cj^stic or abscesscavity in the bone (Figs. 47 and 48, p. 81). Above the apices of the premolar and molar teeth isfound the maxillary sinus or antrum of Highmore. Thissinus varies very much in its extent, shape, and in therelation of its floor to the roots of the teeth. Sometimesthere is a considerable thickness of bone between the toothapices and the sinus (Fig. 3). In other cases the tooth ANATOMY OF THE TEETH AND JAWS 27 apices come right up to the floor of the sinus, even form-ing projections into the cavity, though under normal con-ditions always separated from it by a thin lamina of bone(Fig. 4). Sometimes the ends of the roots are found wellinterpretationof00ivyr
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