. Elementary and dental radiography / by Howard Riley Raper . sial surface of the root is roughened in the region of the abscess. (Radiograph by Lewis of Chicago.) Kig. 186. Canal filling penetrating the tissues between the roots of the lower first molar (Radiograph by Kells, Jr. of New Orleans.) made to learn whether the canals are properly filled, and 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
. Elementary and dental radiography / by Howard Riley Raper . sial surface of the root is roughened in the region of the abscess. (Radiograph by Lewis of Chicago.) Kig. 186. Canal filling penetrating the tissues between the roots of the lower first molar (Radiograph by Kells, Jr. of New Orleans.) made to learn whether the canals are properly filled, and 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. THE USES OF THE RADIOGRAPH IN DENTISTRY 185 Figs. 185 and 186 demonstrate lesions that might be responsible for chronic pericementitis, which couldTigs. 185 and 1S6. t v j * * j *. *u .1 .1 r not be detected by any means other than the use of the Fig. 187. The arrows point to a small abscess (the light area) at the apex of a lower centralincisor. None of the lower anterior teeth have cavities in them.
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