. Dental and oral radiography; a textbook for students and practitioners of dentistry . Fig. 97-B.—Same case six months after curettement, showing partial regenerationof the osseous structure. 152 DENTAL AND ORAL RADIOGRAPHY be easily located by correctly made radiograms, and theirremoval rendered more certain. 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-roo


. Dental and oral radiography; a textbook for students and practitioners of dentistry . Fig. 97-B.—Same case six months after curettement, showing partial regenerationof the osseous structure. 152 DENTAL AND ORAL RADIOGRAPHY be easily located by correctly made radiograms, and theirremoval rendered more certain. 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, snch as incisors, cuspids, etc.,where hypercementosis is suspected, the intra-oralmethod will prove adequate. (See Figs. 95, 96 and 97.). Fig. 98.—Large abscess with cyst formation involving the upper central, lateral and cuspid roots. Where a curettement is to be carried out, intra-oralradiograms will prove sufficient, provided the field is notlarge (Fig. 98.) 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, bat, generally speak- INDICATIO]\TS FOIl IX DENTISTRY 153


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