. Elementary and dental radiography . treatment maybe rendered accordingly. Fillings and crowns without contact points, orfillings with bad gingival margins, or crowns which do not fit well at thecervix or penetrate beneath the gum margin into the peridental membrane,are sometimes the causative factors in chronic pericementitis. Thesethings may be detected usually without the aid of the radiograph. Often,however, a radiograph will demonstrate the fault in a very convincingmanner. Look at lig. 182, for example. Observe between the first andsecond molar the absence of a contact point, the bulgin
. Elementary and dental radiography . treatment maybe rendered accordingly. Fillings and crowns without contact points, orfillings with bad gingival margins, or crowns which do not fit well at thecervix or penetrate beneath the gum margin into the peridental membrane,are sometimes the causative factors in chronic pericementitis. Thesethings may be detected usually without the aid of the radiograph. Often,however, a radiograph will demonstrate the fault in a very convincingmanner. Look at lig. 182, for example. Observe between the first andsecond molar the absence of a contact point, the bulging of the crownband into the interproximal space, and the slight caries of the alveolarprocess. The illustration does no1 show the carious process, which, however, is readiljdiagnosed in the original film, THE USES OF THE RADIOGRAIII IN DENTISTRY 185 Figs. 185 and 186 demonstrate lesions that mightTigs. I$5 and l$6. he responsible for chronic pericementitis, which couldnot be detected by any means other than the use ofthe Fig. 187. The arrow points to a small abscess cavity (the light area) at the apex of a lowercentral incisor. None of the lower anterior teeth had cavities in them.
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