Principles and practice of operative dentistry . ughthe general system, termed general anwsuietics. Local Anaesthetics.—Various remedies have been introduced from time to time for the purpose of producing local insensibility to pain, especially for the extraction of teeth and other minor surgical operations. Most of these, however, have been discarded for various reasons, such as 652 ANESTHETICS, LOCAL AND GENERAL. 653 the unreliability of their anaesthetic power, their danger of producinggeneral toxic effects upon the central nervous system, or their tendency tocause local gangrene and slough
Principles and practice of operative dentistry . ughthe general system, termed general anwsuietics. Local Anaesthetics.—Various remedies have been introduced from time to time for the purpose of producing local insensibility to pain, especially for the extraction of teeth and other minor surgical operations. Most of these, however, have been discarded for various reasons, such as 652 ANESTHETICS, LOCAL AND GENERAL. 653 the unreliability of their anaesthetic power, their danger of producinggeneral toxic effects upon the central nervous system, or their tendency tocause local gangrene and sloughing of the soft tissues. These remedies may be divided into two groups,—first, those whichproduce anwsthesia by the local abstraction of heat; and second, those whichproduce ancesthesia through their local narcotic effect upon the tissues to whichthey are applied. ANESTHESIA BY THE LOCAL ABSTRACTION OF HEAT. Richardson Method.—Dr. B. W. Eichardson (1866) suggested theuse of ether in a finely divided spray thrown upon the parts to be oper-. Spray apparatus—foot-instrument. ated upon. This was accomplished by means of a hand or foot bellows-atomizer. Fig. 644 shows the hand-instrument; Fig. 645 shows the foot- 654 OPERATIVE DENTISTRY. instrument. The strongest ether is used, freed from alcohol and water,and mixed more or less with atmospheric air. The apparatus consists ofa bottle to contain the ether, in the mouth of which a cork is fitted andperforated with two holes, through which a double glass tube is passed,one extremity of the inner part going to the bottom of the bottle ; abovethe cork a tube connected with the bellows pierces the outer part of thedouble tube and communicates by a small opening with the interior of thebottle at the inner side of the cork. The inner tube, reaching to the bottomof the bottle, delivers the ether at the extremity of the outer of the bellows produces two currents of air, one of whichdescends and presses upon the surfac
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdentist, bookyear1920
