. The science and practice of dental surgery. encethere is sometimes a difficulty in giving anegative report; in any case it should not begiven until the film or plate is quite dry, asowing to the swollen state of the emulsionwhen wet, portions of roots, easily seen after-wards, may not be discerned at all. In fact,it is doubtful if a negative report should everbe given. Cases will sometimes occur in which it isexceedingly difficult to distinguish between asmall area of sclerosed bone and a root—thewriter has had several. It is, therefore, neces-sary to regard (1) position, (2) shape, (3)struc
. The science and practice of dental surgery. encethere is sometimes a difficulty in giving anegative report; in any case it should not begiven until the film or plate is quite dry, asowing to the swollen state of the emulsionwhen wet, portions of roots, easily seen after-wards, may not be discerned at all. In fact,it is doubtful if a negative report should everbe given. Cases will sometimes occur in which it isexceedingly difficult to distinguish between asmall area of sclerosed bone and a root—thewriter has had several. It is, therefore, neces-sary to regard (1) position, (2) shape, (3)structure, (4) density. Indeed, it is possiblefor the alveolus and root to become equallydense and in such a case differentiation instructure is not to be seen, and the root is oidyshown by the dark line of periodontal membrane. (7) Supernumerary and Supplemental Teeth.^It occasionally happens that a swelling aboutthe jaws is found, on radiographing the part, tobe due to one of these teeth. They may alsobe an unsuspected source of difficulty in. The writer has frequently expressed theopinion that for small objects—such as buriedroots—radiographs taken on films in the mouthform the best means of discovering them. Inyouth a buried root (owing to the differentdegree of calcification of the tissues) will appearmore distinctly than in an adult; and in thelatter than in old age. In the last period they A i; Fig. 948.—Film Kadiographs of Maxilla showing a method oflocalizing position of tooth or root in edentulous cases. A. Radiograph shows presence of a buried tooth. B. Radiograph with a wax plate and irregular twisted fuse-wire taken in situ. When the wax plate is placed in the mouth the position anddirection of the tooth is easily ascertained. orthodontic cases, especially in the treatmentof semi-rotated upper centrals. In some cases a supernumerary tooth mayhave erupted, and to all appearances be as goodin strength and shape as an adjoining tooth;if then, one or other is to be
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentistry, bookyear19
