. Dental and oral radiography : a textbook for students and practitioners of dentistry . Fig. 9S.—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-ra


. Dental and oral radiography : a textbook for students and practitioners of dentistry . Fig. 9S.—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, but, generally speak- INDICATIONS FOR X-RAY IN DENTISTRY 153. Fig. 99.—This radiogram reveals the fact that there is a congenital absence of per-manent molars on the left side.


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