. Local and regional anesthesia; with chapters on spinal, epidural, paravertebral, and parasacral analgesia, and other applications of local and regional anesthesia to the surgery of the eye, ear, nose and throat, and to dental practice. a h Fig. 255.—Position of needle in mucous anesthesia, aperture of needle pointingtoward the bone: a, Correct position; b, incorrect position. The point of the needle isforced into the periosteum and to the bone. (After Seidel.) to the roots of the teeth, is practically always a paraneural injection,and may require ten or fifteen minutes to become, efifective.
. Local and regional anesthesia; with chapters on spinal, epidural, paravertebral, and parasacral analgesia, and other applications of local and regional anesthesia to the surgery of the eye, ear, nose and throat, and to dental practice. a h Fig. 255.—Position of needle in mucous anesthesia, aperture of needle pointingtoward the bone: a, Correct position; b, incorrect position. The point of the needle isforced into the periosteum and to the bone. (After Seidel.) to the roots of the teeth, is practically always a paraneural injection,and may require ten or fifteen minutes to become, efifective. Theseinjections should be made subperiosteally rather than under the. Fig. 256.—Position of needle for horizontal injections in several upper teeth; a, Labialinjection; b, buccal injection. (After Fischer.) mucous membrane, and under considerable pressure, as this solu-tion must force its way through bony tissue to reach the nerve-fibersat the root of the tooth. Before making the injection the surface is cleansed and touched 648 LOCAL ANESTHESIA
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