. The science and practice of dental surgery. wireis bent to the angle at whicli it is intended todirect the X-rays. A film radiograph is takenwith tlie frame in situ, as shown in Fig. 942. Tlie position of the canine is seen and can bemarked on the model. In the figure the project-ing wire is seen over one of the incisors and 19 appears quite short (although it was four orfive inches long), owing to the rays beingdirected very nearly in the exact direction ofthe wire. This method is somewhat troublesome, andshould oiJy he adopted when better meansare not available. In a case of a lady of midd
. The science and practice of dental surgery. wireis bent to the angle at whicli it is intended todirect the X-rays. A film radiograph is takenwith tlie frame in situ, as shown in Fig. 942. Tlie position of the canine is seen and can bemarked on the model. In the figure the project-ing wire is seen over one of the incisors and 19 appears quite short (although it was four orfive inches long), owing to the rays beingdirected very nearly in the exact direction ofthe wire. This method is somewhat troublesome, andshould oiJy he adopted when better meansare not available. In a case of a lady of middle age, an uppercanine had given a great amount of pain, andalthough seen in the radiograph to be unob-structed and perfectly vertical, it never camedown into its place. A lad of sixteen suffered great pain from acanine in the right maxilla, which had erupteda very little in the incisor fossa. Previous tooperating it was necessary to ascertain the f)osi-tion of the root, and also whether—a pointof more importance—it was of normal Fig. !I43.—UncruptLd Lower Cauiiiu. Tlie X-rays showed the tooth to be fullydeveloped and of normal sliape, but lyingparallel with the floor of the maxillary difficulty was anticipated in theextraction, but after several attempts to dis-place it, it came away with surprising ease onbeing rotated with straight forceps. Lower Canine.—These remain much lessfrequently unerupted; but the writer has hada case where the tooth was lying quite hori-zontally on the inner side of the mandible,and another in which it was directed outwardsand downwards. The usual reason for radio-graphing them is in case of fanned incisors,to ascertain how much pressure is being causedby the canines. They can be radiographedin the same manner as the upper, but stereo-scopic plates are better. In Fig. 943 an unenipted lower canine isseen taken diagonally and postero-anteriorly. Fig. 944, taken with a film, shows the caninepressing against the root
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentistry, bookyear19
