. Interpretation of dental and maxillary roentgenograms . signs to indicate the position of this toothby ordinary examination. Ordinarily such a tooth wouldbe assumed to lie disto-huccally in relation to the secondmolar, and a single x-ray plate would only confirm thisassumption. Stereoscopic plates, however, showed thatthe third molar lay on the disto-palatal aspect of thesecond molar. The operative incision was made at thispoint, the tooth readily found, and laceration of the buccalside of the gum was avoided. In making intraoral films stereoscopically, the most im-portant points to be obser
. Interpretation of dental and maxillary roentgenograms . signs to indicate the position of this toothby ordinary examination. Ordinarily such a tooth wouldbe assumed to lie disto-huccally in relation to the secondmolar, and a single x-ray plate would only confirm thisassumption. Stereoscopic plates, however, showed thatthe third molar lay on the disto-palatal aspect of thesecond molar. The operative incision was made at thispoint, the tooth readily found, and laceration of the buccalside of the gum was avoided. In making intraoral films stereoscopically, the most im-portant points to be observed are that the patients headand the film must maintain the same position for the twoexposures. The angles for the tube holder are based ona working distance of sixteen inches from target to plate rest is first removed from the stand. The tubeholder is then tipped sidewise at an angle to suit the indi-vidual case in the plane at right angles to the dental archof the patient. In the plane parallel to the dental arch. METHODS OF LOCALIZATION 71. i o MS H^ ■>o 72 INTEEPEETATION OF ROENTGENOGRAMS the funnel is in a vertical position. (Fig. 32.) The pa-tient is now seated in the chair, with the head supportedby the head rest in such a position from the end of thefunnel that with the film in the mouth against the teeth tobe studied there will be approximately a distance of six-teen inches from target to film. The position should alsobe adjusted to avoid distortion as much as possible. This centering having been accomplished, the tube is placedin position for the first exposure by moving it one and one-half inches to the left of the central point, and tipping itinward at an angle of 7% degrees from the vertical will bring the focal ray to the same spot on the filmas with the tube in the central position (Figs. 33 and29-Z)). After the first exposure has been made, the secondfilm is quickly inserted in the same position in the mouthas the first, care being
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectradiographydental
