. Interpretation of dental & maxillary roentgenograms . ical bone. 6. Cancellated bone. 7. Medullary spaces, canals, foramina in bone, and softtissues. In disease, the normal condition of a given tissue maybe changed either to a lessening in density, meaningabstraction of lime salts, with consequent deepening ofthe shadow in the x-ray negative, or an increase in den-sity, due to a deposit of lime salts, and indicated by alessening of the shadow. A familiarity with the anatomy of the teeth and jawbones is one of the fundamental essentials for correctinterpretation of odontograms. Lack of this k
. Interpretation of dental & maxillary roentgenograms . ical bone. 6. Cancellated bone. 7. Medullary spaces, canals, foramina in bone, and softtissues. In disease, the normal condition of a given tissue maybe changed either to a lessening in density, meaningabstraction of lime salts, with consequent deepening ofthe shadow in the x-ray negative, or an increase in den-sity, due to a deposit of lime salts, and indicated by alessening of the shadow. A familiarity with the anatomy of the teeth and jawbones is one of the fundamental essentials for correctinterpretation of odontograms. Lack of this knowledgeis frequently a cause of mistaking of normal shadows formanifestations of disease. 24 ANATOMY OF THE TEETH AND JAWS 25 The teeth are set in sockets in the alveolar process,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. 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 usually means some patho-logic condition. (See Fig. 39, p. 79.) 26 INTEK IMt ETAT111 X OF ROB X T< 1B NOGRAMS Roentgenographic Anatomic Landmarks in the Upper and Lower Jaws Upper Jaw At a varying distance above the apices of the centralami lateral incisor teeth is found the floor of the nose(Fig. 2), sometimes seen in the odontogram as a darkinterpretativyr
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