. Dental and oral radiography : a textbook for students and practitioners of dentistry . B. C. Fig. .42.—The Ketcham film holder. A, right and left film holders in graded sizes;B, metal block with film holder attached to it and film in position ready to be placedin the mouth. By closing the teeth upon the metal block, the film holder is held inthe position desired; C, stereoscopic finder attached to the film holder. 90 DENTAL AND oltAL IJAMOCIIAPIIY With these, the patient holds the film in position bygrasping the handle part of the holder, and the operatorcan by noting the angle of the handle
. Dental and oral radiography : a textbook for students and practitioners of dentistry . B. C. Fig. .42.—The Ketcham film holder. A, right and left film holders in graded sizes;B, metal block with film holder attached to it and film in position ready to be placedin the mouth. By closing the teeth upon the metal block, the film holder is held inthe position desired; C, stereoscopic finder attached to the film holder. 90 DENTAL AND oltAL IJAMOCIIAPIIY With these, the patient holds the film in position bygrasping the handle part of the holder, and the operatorcan by noting the angle of the handle, determine the di-rection in which the rays must be directed. The smaller holder is designed for the upper six andlower eight anterior teeth, and the larger holder is de-signed for the posterior areas of the mouth. The Dora: Film Holder.*- -The Dorr film holder is de-signed so that the film is held in position for exposure. Fig. 43.—The Leach film holder. by closing the teeth upon a flange which is part of theholder. (See Fig. 44.) A removable handle is attachedto the edge of the flange and assists in placing the filmholder (carrying the film) in the desired position in themouth, after which the handle can be removed. Two film holders constitute a set of which one has anobtuse angle and is designed for the upper teeth, whilethe other is placed at right angles to the flange and isintended for use upon the lower teeth. *Designed by Dr. I. P. Dorr. DENTAL AND ORAL RADIOGRAPHY TECHNIC 91 Where it is necessary to make a complete radiographicexamination of the dental arches, it can be accomplishedin the average case, by making six exposures of eacharch. The procedure to be followed is diagrammaticallyshown in Fig. 45. The numbers 1, 2, 3, 4, 5, 6 indicate theposition of the x-ray tube in its relation to the dental
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