. The science and practice of dental surgery. ing abnormalitie:?. The enamel of the tooth appears as a lightshadow; the dentine and cementum not quiteso light as enamel; and the pulp cavity muchdarker than the dentine and cementum. Between the socket and the root a fine darkline is seen ref)resonting the ijeiiodontal mem-brane, while external to tliis is a fine white linerepresenting the thin compact l)one of the line is easily seen l)(tween the lower 726 incisors, running up to a point at the cervicaledge; the alveohis between, being cancellated,exhibits a porous appearance, and a
. The science and practice of dental surgery. ing abnormalitie:?. The enamel of the tooth appears as a lightshadow; the dentine and cementum not quiteso light as enamel; and the pulp cavity muchdarker than the dentine and cementum. Between the socket and the root a fine darkline is seen ref)resonting the ijeiiodontal mem-brane, while external to tliis is a fine white linerepresenting the thin compact l)one of the line is easily seen l)(tween the lower 726 incisors, running up to a point at the cervicaledge; the alveohis between, being cancellated,exhibits a porous appearance, and a darkershadow than tlie other tissues. Between themolars the alveolus does not run up into a point,but forms a flat surface almost square teeth (see Fig. 959). The radiographic appearance of teeth andthe surrounding tissues when affected by peri-odontal disease is as follows (see Figs. 960, 961,962). The gingival margin \vill appear as a slightopacity between the teeth transversely nearthe cervical margins. The alveolus wall be seen. If an abscess is present a dark space with well-defhied edges is to be seen, or an iU-defuieddark area at the apex, indicating suppurativeosteitis. Fid. 960.—Shows First Premolar badly affected withperiodontal disease. The other teeth are alsoaffected, the first molar having absorption abovethe bifurcation, and also caries on the distal side. as a more porous structure reaching up theroot a greater or less distance according to theamount of absorption, and having a rough,uneven surface. The gingival margin andalveolar line give the depth of the pocket. Rarefaction, or osteo-porosis, is best seenbetween the roots of teeth, as irregularly shapeddark spots, usually noticed midway betweenthe roots of the teeth in the incisor region ofthe mandible. The apex of the roots may appear bluntedor shortened, and shaped irregularly, indicatingabsorption. It may seem as if the apex hadbeen excised, or the root shortened and reducedperipherally, leavin
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentistry, bookyear19
