. Dental and oral radiography : a textbook for students and practitioners of dentistry . Fig. 90-B.—Same case six months after , showing partial regeneration of the osseous structure. INDICATIONS FOR X-RAY IN DENTISTRY 171 Radiographic Requirements.—Both the extra-oral andintra-oral radiograms are indicated in this field. Forimpacted third molars, the extra-oral method is best, asit will clearly show not only the third molar, but its re-lationship to all other adjacent structures. In the caseof single-rooted teeth, such as incisors, cuspids, etc.,where hypercementosis is suspected,
. Dental and oral radiography : a textbook for students and practitioners of dentistry . Fig. 90-B.—Same case six months after , showing partial regeneration of the osseous structure. INDICATIONS FOR X-RAY IN DENTISTRY 171 Radiographic Requirements.—Both the extra-oral andintra-oral radiograms are indicated in this field. Forimpacted third molars, the extra-oral method is best, asit will clearly show not only the third molar, but its re-lationship to all other adjacent structures. In the caseof single-rooted teeth, such as incisors, cuspids, etc.,where hypercementosis is suspected, the intra-oralmethod will prove adequate. (See Figs. 88, 89 and 90.) Where a curettement is to be carried out, intra-oralradiograms will prove sufficient, provided the field is notlarge. (Fig. 91.). Fig. 91.—I<arge abscess with cyst formation involving the upper central, lateral and cuspid roots. In fractures of the mandible, the extra-oral methodshould always be used, so that the entire field in the re-gion of the fracture can be visualized. For fractures of the maxilla, intra-oral radiogramswill usually suffice. In the Practice of Orthodontia The necessity for using the x-ray in orthodontic prac-tice varies with different patients, but, generally speak-ing, may be summarized under ten different headings asfollows: 1. As a means of determining the presence or ab- 172 DENTAL AND ORAL RADIOGRAPHY
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