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12 The lower jaw is displaced forwards, sometimes on one side, sometimes on both. If on one side, it inclines with the chin to the opposite side, the teeth do not correspond with their fellows, but the canine are under the incisors. But if on both sides, the whole chin is moved forwards, and the lower teeth stick out beyond the upper ones; and the muscles above appear tense. As soon as possible the patient is to be seated on a stool, with an assistant behind holding his head, or with his[p. 565] back against a wall and a hard leather cushion between the wall and the back of his head, against which his head is firmly pushed by the assistant, to keep it from moving. Then the surgeon's thumbs, which have been wrapped round with strips of linen or bandages so that they may not slip, are inserted into the mouth whilst the fingers are applied outside. When the jaw has been grasped firmly, if it has slipped forwards to one side, the chin is to be pressed down towards the throat with a jerk. Then simultaneously the head is firmly held, and the chin being raised the jaw is forced back to its place, and the mouth is closed so that all this is done almost with one movement. If it has been dislocated on both sides all the same movements are to be done except that the jaw is forced straight backwards. When the bone is in its place, if the accident has been attended with pain in the eyes and neck, blood is to be let from the arm. For all patients with dislocated bones, a more liquid diet is proper at first, but especially in this case, since even talking, as it causes constant movement of the mouth by means of the sinews, is harmful.
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