. 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
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